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WO2022039168A1 - Produit traité et procédé de production d'un produit traité - Google Patents

Produit traité et procédé de production d'un produit traité Download PDF

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Publication number
WO2022039168A1
WO2022039168A1 PCT/JP2021/030070 JP2021030070W WO2022039168A1 WO 2022039168 A1 WO2022039168 A1 WO 2022039168A1 JP 2021030070 W JP2021030070 W JP 2021030070W WO 2022039168 A1 WO2022039168 A1 WO 2022039168A1
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WO
WIPO (PCT)
Prior art keywords
die
processed product
plate thickness
cut end
cut
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/030070
Other languages
English (en)
Japanese (ja)
Inventor
尚文 中村
忍 大屋
宏和 佐々木
ハミード イサカ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to MX2023002012A priority Critical patent/MX2023002012A/es
Priority to CN202180050731.5A priority patent/CN115943002A/zh
Priority to KR1020237008926A priority patent/KR20230051772A/ko
Priority to JP2022500586A priority patent/JP7358608B2/ja
Publication of WO2022039168A1 publication Critical patent/WO2022039168A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/16—Shoulder or burr prevention, e.g. fine-blanking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D15/00—Shearing machines or shearing devices cutting by blades which move parallel to themselves

Definitions

  • the present invention relates to a processed product manufacturing method for manufacturing a processed product having a cut end portion using a plated steel sheet having a plated layer on the surface as a material, and the processed product thereof.
  • processed products made of plated steel sheets having a plated layer on the surface are increasingly used as parts of equipment such as automobiles and home appliances.
  • a plated steel sheet as a material, surface treatment after molding of the processed product can be omitted, and the manufacturing cost can be suppressed.
  • Omitting the surface treatment after molding it is possible to avoid deterioration of the dimensional accuracy of the parts due to the surface treatment after molding. Omitting the surface treatment after molding is particularly considered for parts that require high dimensional accuracy, such as motor cases.
  • the area where the steel sheet substrate is exposed appears at the cut end of the processed product.
  • red rust may occur in the exposed area of the steel sheet substrate. Red rust deteriorates the appearance of processed products.
  • the area where red rust is generated expands with the passage of time, there is a concern that the strength of the processed product may decrease due to red rust.
  • electrical short circuit due to lack of rust.
  • the flange of a drawn product such as a motor case may be provided with a screw hole for fixing the processed product to other equipment. Poor flatness around the screw holes may lead to a decrease in fastening force.
  • the dimension of the flange portion is set large in consideration of the sagging dimension of the cut end portion. Increasing the size of the flange will increase the weight of the material.
  • the thickness of the Zn-based plated steel sheet is 0 on the shoulder of the punch or die.
  • punching using a die having a radius of curvature of 1 to 0.5 times, the ratio of the sheared surface of the punched end surface after punching is 90% or more, and the zinc coverage of the sheared surface is increased.
  • a method of increasing to 50% or more has been proposed.
  • the punching clearance is set to 1 to 20% of the plate thickness regardless of the plate thickness of the Zn-based plated steel sheet, and the thickness of the Zn-based plated steel sheet is 0.12 on the shoulder of the punch or die.
  • a Zn-based galvanized steel sheet is cut using a mold with a radius of curvature that is more than double, and processed products with a sagging Z of 0.10 x plate thickness or more and a sagging X of 0.45 x plate thickness or more on the cut end face are cut. How to get it has been proposed.
  • Patent Document 3 a method of obtaining a product having corrosion resistance of an end face by half-cutting a plated steel sheet with a minus clearance to 60 to 95% of the plate thickness and shearing it by flat pressing from the opposite side of the half-cutting. Has been proposed.
  • Patent Document 4 a first step of half punching a metal plate material by using a first punch and a first die and attaching a shaving allowance to the final processed surface of a punched portion of the metal plate material is described. Using a second punch and a second die, it has a second step of further performing shaving processing mainly on shearing on the half-punched portion, and 70% or more on the final processed surface of the punched portion. A method for pressing a metal plate material to secure a sheared surface is disclosed.
  • Patent Document 5 a shear drilling process is performed in which the first step is performed with a negative clearance and then the second step is performed with a positive clearance using a punch and a die having no roundness (R) on the cutting edge. The method is described.
  • Patent Document 1 targets a steel plate having a plate thickness of 2 mm or less, and when a steel plate having a plate thickness of more than 2 mm is used as a material, the zinc coverage of the sheared surface becomes insufficient and red rust occurs. It can be difficult to control. In addition, it is difficult to apply it to drawn products such as motor cases where the flange end is thickened.
  • the plated steel sheet is half-cut with a minus clearance and sheared by flat pressing from the opposite side of the half-cut. For this reason, a fracture surface may be formed at an intermediate position in the plate thickness direction of the cut end portion of the plated steel sheet, and whiskers-like burrs may be generated when the plated steel sheet is pressed flat, resulting in deterioration of shape quality.
  • Patent Document 4 is a technique related to shaving processing, and the final processed surface of the metal plate material is made good by forming a large sheared surface. Even if a metal plate having a plating layer on the surface is shaving by the method described in Patent Document 4, the plating layer on the surface hardly remains on the final processed surface, so that the corrosion resistance of the final processed surface is low.
  • the punch and die cutting edges used in the second step are not rounded (R), so that even if a plated steel sheet is used as a material, a plated layer remains on the cut end face. No effect can be expected.
  • the present invention has been made in view of the above problems, and an object of the present invention is corrosion resistance and shape quality even when a plated steel sheet having a plate thickness of more than 2.0 mm is used as a material. It is an object of the present invention to provide a good processed product and a method for manufacturing the processed product.
  • a processed product made of a plated steel sheet having a plating layer on the surface and having a cut end portion along the plate thickness direction of the processed product is cut.
  • the end portion has sagging, sheared surface and fracture surface in order, or sagging and sheared surface in order in the plate thickness direction of the cut end portion, and the sheared surface is covered with a plating layer on the surface.
  • the ratio L / t1 of the residual component length L to the plate thickness t1 of the cut end of the processed product is 0.70 or more, and the sagging length Z of the cut end in the plate thickness direction is the cutting of the processed product.
  • a processed product is provided having a plate thickness of t1 at the end and less than 0.10 times.
  • the length W1 of the fracture surface in the plate thickness direction of the cut end portion may be more than 0 mm and 1.0 mm or less.
  • the length W1 of the fracture surface in the plate thickness direction of the cut end portion may be 0.5 mm or less.
  • the length X of the sagging in the plane direction orthogonal to the plate thickness direction of the cut end portion may be 0 times and less than 0.30 times the plate thickness t1 of the cut end portion of the processed product.
  • the length of the burr at the cut end may be less than 0.2 mm.
  • the cut end portion has sagging, shearing surface, fracture surface and coining surface in order, or sagging, shearing surface and coining surface in order in the plate thickness direction of the cutting end portion, and the plate thickness of the cut end portion.
  • the length W2 of the fracture surface between the sheared surface and the coining surface in the direction may be more than 0 mm and 0.5 mm or less.
  • it is a processed product manufacturing method for manufacturing a processed product having a cut end portion using a plated steel plate having a plated layer on the surface as a material. Then, using the first die and the first punch in which the clearance between the first die and the first punch is set to minus clearance, the cut portion of the first element body formed from the material is half-cut in the plate thickness direction. Using the half-cutting step and the second die and the second punch, the half-cut first element body is finished and cut from the same direction as the half-cutting to obtain a processed product having a cut end portion along the plate thickness direction.
  • the inner diameter D 32 of the second die is set to the inner diameter D 31 or more of the first die, and the cutting is performed on the inner side of the processed product.
  • the outer diameter d 32 of the second die is set to the outer diameter d 31 or less of the first die, the plate thickness of the cut portion of the first element body is t1, and the plate thickness of the cut portion after the semi-cutting step is set.
  • the clearance C 31-41 between the first die and the first punch satisfies the following formula (a1)
  • the radius of curvature R1 of the cutting edge of the first die is the following formula (a2)
  • the pushing amount D of the first die or the first punch with respect to the cut portion of the first element body satisfying a2) satisfies the following formula (a3), and the distance C between the first die and the first punch at the bottom dead point.
  • PD satisfies the following formula (a4)
  • the clearance C 32-42 between the second die and the second punch satisfies the following formula (a5), and the radius of curvature of the cutting edge of the second die.
  • R2 is provided with a processed product manufacturing method that satisfies the following formula (a6).
  • a6 -0.25 x t1 ⁇ C 31-41 ⁇ -0.01 ... (a1) 0.10 ⁇ t1 ⁇ R1 ⁇ 0.50 ⁇ t1 ⁇ ⁇ ⁇ (a2) D ⁇ 0.70 ⁇ t1 ⁇ ⁇ ⁇ (a3) CPD ⁇ 0.20 ⁇ ⁇ ⁇ (a4) 0.01 ⁇ C 32-42 ⁇ 0.2 x t2 ... (a5) 0.25 ⁇ R2 ⁇ 1.50 x t2 ... (a6)
  • the unit of C 31-41 , CP D , C 32-42 and R2 is mm.
  • it is a processed product manufacturing method for manufacturing a processed product having a cut end portion using a plated steel plate having a plated layer on the surface as a material. Then, using the first die and the first punch in which the clearance between the first die and the first punch is set to minus clearance, the cut portion of the first element body formed from the material is half-cut in the plate thickness direction. Using the half-cutting step and the second die and the second punch, the half-cut first element body is finished and cut from the same direction as the half-cutting, and the cut surface has a cut end portion along the plate thickness direction.
  • the inner diameter D 32 of the second die is set to the inner diameter D 31 or more of the first die, and the inside of the processed product.
  • the outer diameter d 32 of the second die is set to be equal to or less than the outer diameter d 31 of the first die, and the plate thickness of the cut portion of the first element is t1, after the semi-cutting step.
  • the clearance C 31-41 between the first die and the first punch satisfies the following formula (b1), and the radius of curvature R11 of the cutting edge of the first die is.
  • the processed product obtained in the finish cutting step is used as the second element, and the corners of the cut end of the second element are pressed against the pad to form a coining surface at the corners. It may further include a coining step to obtain the product.
  • is 1.00 mm or less.
  • It may be 1.00 mm or less.
  • the above-mentioned processed product manufacturing method may further include a preparatory step of forming a first prime field having a hollow side wall and a flange portion from a flat plate-shaped plated steel plate before the semi-cutting step.
  • FIG. 2 is a detailed view of a cross-sectional view on the left side. It is a graph which shows the relationship between the sagging X and the sagging Z of FIG. It is explanatory drawing which shows the processed product manufacturing method which concerns on the same embodiment.
  • FIG. 1 is a perspective view showing an example of a processed product 1 manufactured by the processed product manufacturing method according to the first embodiment of the present invention.
  • the processed product 1 shown in FIG. 1 is a motor case made of a plated steel plate having a plating layer on the surface.
  • the motor case shown in FIG. 1 can be formed by subjecting a flat plate-shaped plated steel sheet to a forming process such as drawing.
  • the processed product 1 has a body portion 10, a protrusion portion 11, and a flange portion 12.
  • the body portion 10 has a hollow cylindrical side wall 101 and a top wall 103 formed so as to cover one end of the side wall 101.
  • the top wall 103 may be called another way such as a bottom wall depending on the orientation in which the processed product 1 is used.
  • the body portion 10 of the processed product 1 shown in FIG. 1 has a perfect circular cross-sectional shape in an XY plane, but the present invention is not limited to this example.
  • the cross-sectional shape of the body portion 10 on the XY plane may be another shape such as an ellipse or a polygon.
  • the protrusion 11 is a protrusion protruding from the top wall 103 to the outside in the central axial direction (Z direction) of the body 10.
  • the protrusion 11 does not necessarily have to be formed, and the top wall 103 may have a flat plate shape.
  • the flange portion 12 is a plate portion extending radially outward from the end portion of the body portion 10 (that is, the other end of the side wall 101).
  • the shape of the flange portion 12 is arbitrary.
  • the flange portion 12 according to the present embodiment extends in the radial direction of the body portion 10 over the entire circumferential direction of the body portion 10.
  • the flange portion 12 is provided with a plurality of screw holes 121 separated from each other in the circumferential direction of the body portion 10. A screw 123 is inserted through the screw hole 121.
  • the processed product 1 can be fixed to the mounting target by, for example, being fastened to the mounting target such as a vehicle body using a screw 123.
  • the flange portion 12 according to the present embodiment is formed by cutting a flange portion prime field (flange portion prime field 20 in FIG. 5) having an outer diameter larger than the outer diameter of the flange portion 12 finally formed in the processed product 1. Is formed. That is, the processed product 1 according to the present embodiment has a cut end portion 13 on the outer periphery of the flange portion 12.
  • Cutting processing includes processing such as cutting, punching and drilling.
  • Cutting is a process of cutting an object to be cut along a predetermined straight line or curve.
  • Punching is the process of punching a product from the object to be cut.
  • Drilling is a process of punching a non-product part from a cutting target to obtain a product having an opening.
  • the flange portion 12 shown in FIG. 1 can be obtained by punching from the flange portion prime field.
  • the plated steel sheet it is preferable to use a plated steel sheet having various plating layers.
  • various steel sheets can be used, but it is preferable to use a Zn-based plated steel sheet.
  • Zn-based plating includes Zn plating, Zn-Al-based alloy plating, Zn-Al-Mg-based alloy plating, and Zn-Al-Mg-Si-based alloy plating.
  • the plated steel sheet it is particularly preferable to use a steel sheet plated with a Zn—Al—Mg based alloy.
  • the alloy plating preferably contains 80% by mass or more of Zn, and more preferably 90% by mass or more of Zn, based on the total number of moles of the plating.
  • the base steel sheet of the plated steel sheet is arbitrary, but may be, for example, ultra-low carbon steel or the like.
  • the lower limit of the amount of plating adhered to the plated steel sheet is preferably 30 g / m 2 , and more preferably 45 g / m 2 may be the lower limit.
  • the plating adhesion amount on the plated steel sheet may be preferably 450 g / m 2 as the upper limit, and more preferably 190 g / m 2 as the upper limit.
  • the plating adhesion amount is 45 g / m 2 or more, the plated metal easily wraps around the sheared surface of the cut end portion 13 (sheared surface 13c in FIG. 2), so that the corrosion resistance after the cutting process can be improved.
  • the plate thickness of the plated steel plate is arbitrary, but may be 2.0 mm or less, or may be more than 2.0 mm.
  • the thickness of the plated steel sheet may be, for example, 0.8 mm or more and 6.0 mm or less, more preferably 2.0 mm or more and 4.5 mm or less.
  • FIG. 2 shows the cut end portion 13 in the region A of the processed product 1 of FIG. 1, the left side is a cross-sectional view on a ZX plane including the central axis of the processed product 1, and the right side is a side view from the X direction.
  • FIG. 3 is a detailed cross-sectional view on the left side of FIG.
  • FIG. 4 is a graph showing the relationship between the sagging X and the sagging Z in FIG.
  • the plate thickness direction T of the flange portion 12 is assumed to be the same direction as the Z direction which is the central axis direction of the processed product 1 shown in FIG. Further, in FIG. 2, the description of the plating layer 13f is omitted.
  • the cut end portion 13 of the flange portion 12 of the processed product 1 has a sagging 13b, a sheared surface 13c, and a fracture surface 13d in order from the upper surface 13a in the plate thickness direction T of the flange portion 12. And has a burr 13e. It is preferable that the processed product 1 has no burrs 13e, and the processed product 1 according to the present embodiment may be a processed product 1 without burrs 13e.
  • the upper surface 13a is the surface (pressed surface) into which the cutting die is pushed during the cutting process of the flange portion prime field.
  • the sagging 13b is a portion where a tensile force acts on the surface of the flange element (plated steel plate) when the cutting die is pushed into the flange element, and the surface of the flange element is deformed. ..
  • the dimension of the sagging 13b in the plate thickness direction T of the flange portion 12 is referred to as "sagging Z”
  • the dimension of the sagging 13b in the plane direction orthogonal to the plate thickness direction T is referred to as "sagging X”.
  • the sheared surface 13c is a surface on which the flange prime field is sheared by the cutting edge of the cutting die.
  • the sheared surface 13c is adjacent to the sagging 13b in the plate thickness direction T of the flange portion 12.
  • the fracture surface 13d is a surface where cracks generated from the cutting edge of the cutting die to the flange portion element are associated and broken.
  • the fracture surface 13d is adjacent to the sheared surface 13c in the plate thickness direction T of the flange portion 12.
  • the burr 13e is a portion where the flange portion prime field is stretched or torn off when the fracture surface 13d is formed.
  • the burr 13e is adjacent to the fracture surface 13d in the plate thickness direction T of the flange portion 12.
  • the sagging 13b, the fracture surface 13d and the burr 13e can be suppressed to a small size.
  • the cut end portion 13 is formed so that the plating layer 13f wraps around the sheared surface 13c from the upper surface 13a of the cut end portion 13.
  • the plating layer 13f wraps around the sheared surface 13c by being stretched by the cutting die when the cutting edge of the cutting die bites into the flange portion element body. Due to the wraparound of the plating layer 13f, at least a part of the sheared surface 13c is covered with the plating layer 13f. The occurrence of red rust can be suppressed in the portion of the sheared surface 13c covered with the plating layer 13f.
  • the plating layer 13f is a Zn-based plating layer
  • the occurrence of red rust can be suppressed even in the vicinity of the portion covered by the plating layer 13f due to the sacrificial anticorrosion action of the Zn-based plating layer.
  • the length L of the plating layer 13f covering at least a part of the sagging 13b and the sheared surface 13c from the upper surface 13a of the cut end portion 13 is the plate thickness of the cut end portion 13 of the processed product 1. It is 0.7 times or more of t1. That is, the ratio L / t1 of the residual length L of the plating component whose shear surface 13c is covered by the plating layer 13f and the plate thickness t1 of the cut end portion 13 of the processed product 1 is 0.70 or more.
  • the length L of the plating layer 13f can be said to be the distance between the upper surface 13a of the cut end portion 13 related to the plate thickness direction T of the flange portion 12 and the lower end of the plating layer 13f.
  • the plate thickness t1 of the cut end portion 13 of the processed product 1 is equal to the plate thickness of the flange portion 12 of the processed product 1, as shown in FIG. Therefore, in the following, the plate thickness of the flange portion 12 may be expressed as "plate thickness t1".
  • the fracture surface 13d is generated as a result of the association of cracks generated in the flange portion element body, and is a rough surface-like new surface.
  • the metal component of the steel substrate is exposed.
  • the plating layer 13f covering the sheared surface 13c does not easily wrap around to the fracture surface 13d. Therefore, the fracture surface 13d is more likely to generate red rust ahead of the other surfaces of the cut end portion 13.
  • the present inventors conducted experiments in which the plate thickness t1 of the flange portion 12 on which the cut end portion 13 was formed, cutting processing conditions, surface treatment conditions, and the like were changed in various ranges, and the occurrence of red rust was investigated. ..
  • the plating layer 13f is wrapped around the sheared surface 13c from the upper surface 13a to set the ratio L / t1 to 0.70 or more, and the flange portion 12 is sagging 13b in the plate thickness direction T.
  • the plate thickness of the flange portion 12 is equal to the plate thickness t1 of the cut end portion 13 of the processed product 1, and is the outermost plate thickness of the flange portion 12 (however, the plate thickness of the portion where the sagging 13b does not occur). .).
  • the length W1 of the fracture surface 13d (hereinafter, also referred to as “fracture surface length”) related to the plate thickness direction T of the flange portion 12 is preferably more than 0 mm and 1.0 mm or less. If the fracture surface length W1 is 1.0 mm or less, even if red rust occurs on the fracture surface 13d, it is not noticeable, so it can be judged that there is no practical problem.
  • the fracture surface length W1 of the processed product 1 is preferably small, and may be 0.8 mm or less or 0.6 mm or less. It is more preferable that the fracture surface length W1 of the processed product 1 is 0.5 mm or less, 0.3 mm or less, or 0.2 mm or less. Further, the ratio W1 / t1 of the fracture surface length W1 and the plate thickness t1 of the cut end portion 13 of the processed product 1 is less than 0.15, less than 0.10, less than 0.08, less than 0.06, or 0. It may be less than 04.
  • the fracture surface length W1 of the processed product 1 may be 0 mm. That is, the cut end portion 13 of the processed product 1 does not have to have the fracture surface 13d.
  • the cut end portion 13 has a sagging 13b and a sheared surface 13c (more burrs 13e if burrs 13e are generated) in order from the upper surface 13a in the plate thickness direction T of the flange portion 12.
  • the sagging Z is less than 0.10 times the plate thickness of the flange portion 12, that is, the plate thickness t1 of the cut end portion 13 of the processed product 1.
  • the plate thickness t1 of the flange portion 12 is also equal to the plate thickness of the flange portion prime field 20.
  • the sagging Z is preferably small, and may be less than 0.08 times, less than 0.06 times, or less than 0.04 times the plate thickness of the flange portion 12, that is, the plate thickness t1 of the cut end portion 13 of the processed product 1.
  • FIG. 4 shows an example of the relationship between the sagging Z and the sagging X at the cut end of a product manufactured by punching in one process.
  • the cutting edge of the cutting die pushed into the flange element is given a radius of curvature of 0.01 to 0.30 in terms of the plate thickness ratio of the flange element, and the clearance of the cutting die is set to 0 of the plate thickness.
  • It shows the relationship between the sagging Z and the sagging X at the cut end of the product when punching is performed by setting the value to 0.01 to 0.20 times.
  • the sagging X appearing in the plane direction becomes about 3 to 4 times larger than the sagging Z in the plate thickness direction.
  • the sagging X in the plane direction becomes large, and in order to secure the flat portion around the screw 123 necessary for fixing the processed product 1 to the mounting target, it is necessary.
  • the trim size must be increased by the amount of sagging X. From this, it is preferable that the sagging X is 0 times and less than 0.30 times the plate thickness of the flange portion 12 of the processed product 1, that is, the plate thickness t1 of the cut end portion 13 of the processed product 1.
  • the sagging X is small, that is, the plate thickness of the flange portion 12, that is, the plate thickness t1 of the cut end portion 13 of the processed product 1 is less than 0.25 times, less than 0.26 times, less than 0.15 times, 0.12. It may be less than double or less than 0.10 times.
  • the length of the burr 13e generated on the lower side of the fracture surface 13d of the cut end portion 13 of the processed product 1 may be less than 0.2 mm.
  • the burrs 13e can cause dents, electrical short circuits, and the like.
  • the length of the burr 13e is more preferably less than 0.1 mm. It is most preferable that the length of the burr 13e is 0 mm, that is, the burr 13e does not exist in the processed product 1.
  • the plated steel sheet is cut by two steps, a semi-cutting step and a finish cutting step, instead of cutting in one step.
  • a semi-cutting step is cut by two steps, a semi-cutting step and a finish cutting step, instead of cutting in one step.
  • the processed product manufacturing method according to the present embodiment will be described.
  • FIG. 5 is an explanatory diagram showing a processed product manufacturing method according to the present embodiment.
  • the processed product manufacturing method according to the present embodiment includes a preparation step, a semi-cutting step, and a finish cutting step.
  • the preparation process is the process of preparing the first prime field 2.
  • the first prime field 2 can be obtained by subjecting a flat plate-shaped plated steel sheet to a forming process such as drawing. That is, the first prime field 2 is made of a plated steel plate as the processed product 1.
  • the first prime field 2 includes a flange portion prime field 20 having an outer diameter larger than that of the flange portion 12 shown in FIG.
  • the flange portion prime field 20 may have a circular outer shape or a non-circular outer shape in a plan view. With respect to the portion other than the flange portion prime field 20, the first prime field 2 may have the same shape as the processed product 1.
  • the preparation step is not an indispensable part for the implementation of the present invention. If the prime field processed by a third party can be obtained by some method, the preparation step can be omitted.
  • the half-cutting step is a step of half-cutting the first prime field 2.
  • the flange portion prime field 20 is half-cut.
  • the half-cutting is a process of cutting the flange portion element 20 to an intermediate position in the plate thickness direction of the flange portion element 20.
  • the finish cutting process is a process of finishing cutting the first prime field 2.
  • the removed portion 20a of the flange portion element 20 is cut and separated from the flange portion element 20.
  • the flange portion 12 is formed by cutting the removed portion 20a. That is, in the processed product manufacturing method according to the present embodiment, the processed product 1 is obtained from the first prime field 2 prepared in the preparatory step through a semi-cutting step and a finish cutting step.
  • the screw hole 121 of the processed product 1 shown in FIG. 1 may be formed in the flange portion element 20 at the stage of the first element body 2, or may be formed in the flange portion 12 after the finish cutting step.
  • the flange portion prime field 20 is machined using a die and a punch.
  • the details of the semi-cutting process and the finishing cutting process will be described in two forms according to the shapes of the cutting edges of the die and the punch used in the semi-cutting process.
  • the cutting edge of the die and punch may be referred to as the "shoulder".
  • the die on the pushing side is referred to as a die
  • the die on the pushing side is referred to as a punch.
  • the mold on the push-in side may be located above or below the element body. Even when moving in the horizontal direction, the die on the pushing side is called a die, and the die on the pushing side is called a punch.
  • the processed product 1 shown in FIG. 2 is cut by using the upper mold as a mold on the pushing side.
  • the cut end portion 13 of the processed product 1 has the sagging 13b at the maximum of the cut end portion 13, contrary to FIG.
  • the burr 13e is located at the uppermost position. That is, of the two surfaces of the flange portion element 20 facing each other in the plate thickness direction, the die that pushes the surface on the side where the sagging 13b of the processed product 1 is located after processing is called a die, and the mold on the side where the burr 13e is located is called a die. A mold that pushes the surface is called a punch.
  • the die that presses the die may be referred to as a die, and the die that presses the surface on the side where the burr 13e is located may be referred to as a punch.
  • the die When the cut end portion 13 is formed on the outer peripheral side of the processed product 1 as shown in FIG. 2, the die is located on the outer peripheral side of the punch. At the time of processing, the inner surface of the die faces the cut end portion 13, and the outer surface of the punch is flush with the cut end portion 13. On the other hand, when the cut end portion 13 is formed on the inner peripheral side of the processed product 1, as in the case of cutting the inner peripheral surface of the flat washer 900 shown in FIG. 16 described later, the die is the inner circumference of the punch. Located on the side. At the time of processing, the outer surface of the die faces the cut end portion 13, and the inner surface of the punch is flush with the cut end portion 13. Further, as shown in FIGS.
  • both the die 61 and the die 63 on the pushing side are referred to as dies.
  • the die 65 on the side to be pushed in is called a punch.
  • FIG. 6 is an explanatory diagram showing a half-cutting process when the cutting edge of the die used in the half-cutting process has an R shape.
  • FIG. 7 is an explanatory diagram showing a finish cutting step performed following the half-cutting step of FIG.
  • the flange portion prime field 20 of the first prime field 2 is half-cut using the first die 31 and the first punch 41.
  • FIG. 6 shows a mode in which the flange portion 12 is half-pulled from the flange portion prime field 20 sandwiched by the first punch 41 and the first plate retainer 51 as one aspect of half-cutting.
  • the first die 31 constitutes a cutting die that is pushed into the flange portion prime field 20 in half-cutting.
  • the mold for pressing the portion of the flange portion 20 that becomes the flange portion 12 is the first punch 41
  • the mold for pressing the removed portion 20a is the first die 31.
  • the clearance C 31-41 between the first die 31 and the first punch 41 is a negative clearance.
  • the clearance C 31-41 represents a gap between the first die 31 and the first punch 41, and specifically, as shown in FIG. 6, the side surface 31a of the first die 31 and the first punch 41 It is represented by the distance from the side surface 41a.
  • the clearance when the first punch 41 is separated from the first punch 41 is called a plus clearance, and the clearance when the first die 31 and the first punch 41 partially overlap is called a minus clearance.
  • the clearance between the die and the punch the positive clearance is represented by a positive value and the negative clearance is represented by a negative value.
  • the first die 31 and the first punch 41 are one when viewed from the pushing direction of the first die 31. They are arranged so that they overlap.
  • the clearance C 31-41 is a plus clearance
  • cracks generated from the cutting edges of the first die 31 and the first punch 41 are associated with each other as in the case of punching performed once, and the portion 20a removed from the flange portion element 20a. May be completely disconnected.
  • the sagging 13b of the cut end portion 13 will increase.
  • the compressive stress increases, and the material that originally flows to the scrap side is pushed back to the flange portion 12.
  • the material is also filled in the portion where the sagging 13b is formed after the cutting process, and the sagging 13b can be reduced.
  • the shorter the length of the material scrapped after the cutting process the more the material is from the tip of the cutting edge of the first die 31 to the first die. It is easy to flow to the side surface 31a side of 31. Therefore, the side surface 31a of the first die 31 is located within a range of not more than twice the plate thickness of the flange portion 20 (that is, the flange portion 12) from the end portion of the flange portion element 20. It is preferable to arrange 31 and cut it in half.
  • the clearance C 31-41 [mm] between the first die 31 and the first punch 41 is ⁇ 0.01 mm or less and the flange portion element 20 of the first element 2 is as shown in the following formula (a1). (That is, it is set to ⁇ 0.25 times or more the plate thickness t1 [mm] of the flange portion 12).
  • the clearance C 31-41 When the clearance C 31-41 is ⁇ 0.01 mm or less, the negative clearance can be maintained without partially becoming a positive clearance due to the slide accuracy of the press machine, the misalignment of the die, and the like. As a result, cracks are generated during the half-cutting, complete cutting occurs, and a large fracture surface does not occur. On the other hand, if the clearance C 31-41 is ⁇ 0.25 times or more the plate thickness t1 of the flange portion element 20, the forming load required for half-cutting does not increase, and the pressing capacity is not exceeded. Therefore, the burden on the mold is small, and it is possible to suppress a decrease in the life of the mold.
  • the upper limit of the clearance C 31-41 may be ⁇ 0.05 times or ⁇ 0.10 times the plate thickness t1 of the flange portion element 20.
  • the upper limit of the clearance C 31-41 may be ⁇ 0.20 times or ⁇ 0.15 times the plate thickness t1 of the flange portion element 20.
  • the cutting edge of the first die 31 has an R shape having a radius of curvature R1. As shown in FIG. 6, since the first die 31 is pushed into the flange portion prime field 20, the cutting edge of the first die 31 has an R shape having a radius of curvature R1.
  • the radius of curvature R1 [mm] is 0.10 times or more the plate thickness t1 [mm] of the flange portion element 20 (that is, the flange portion 12) of the first element 2 as shown in the following equation (a2). It shall be 0.50 times or less.
  • the radius of curvature R1 is 0.10 times or more the plate thickness t1
  • a large hydrostatic pressure is generated under a negative clearance without scraping the plating layer 13f
  • the cutting edge of the first die 31 becomes scrap directly under the first die 31.
  • the material in contact with the tip can flow from the cutting edge of the first die 31 to the side surface 31a side of the first die 31. Due to this flow, in the stress generated when the first die 31 is pushed into the flange portion prime field 20, between the material that becomes scrap (that is, the removed portion 20a) after the cutting process and the flange material that becomes the flange portion 12.
  • the proportion of tensile stress generated is reduced. As a result, it is possible to wrap around the sheared surface 13c and the plating layer 13f.
  • the radius of curvature R1 is 0.50 times or less the plate thickness t1
  • the amount of material located at the cutting edge of the first die 31 is reduced during half-cutting, and a fracture surface 13d is generated in the subsequent finish cutting. Can be reduced.
  • the cutting edge of the first punch 41 has a square shape without roundness as shown in FIG.
  • the cutting edge of the first punch 41 may have a radius of curvature less than 0.1 times the plate thickness t1 of the flange portion element 20 of the first element 2.
  • the radius of curvature of the cutting edge of the first punch 41 is set to be less than 0.06 times, less than 0.04 times, or less than 0.02 times the plate thickness t1 of the flange portion element 20 of the first element 2, if necessary. May be good.
  • the pushing amount D [mm] of the first die 31 into the flange portion element 20 of the first element 2 is, as shown in the following formula (a3), the flange portion element 20 of the first element 2 (that is, that is). It is set to 0.70 times or more the plate thickness t1 [mm] of the flange portion 12).
  • the pushing amount D is a position where the pushing of the first die 31 is stopped from a position where the first die 31 comes into contact with the upper surface of the flange portion prime 20 of the first prime field 2 (hereinafter, this).
  • the position is also referred to as “bottom dead center”), which is the amount of movement of the first die 31.
  • the distance CPD [mm] between the first die 31 and the first punch 41 at the bottom dead center is set to 0.20 mm or more as shown in the following formula (a4).
  • the remaining plate thickness t2 in which the flange portion element 20 (that is, the removed portion 20a) remains in the first element body 2 after half-cutting is 0.30 times or less the plate thickness t1 [mm] of the flange portion element 20. May be.
  • the residual plate thickness t2 is the residual plate thickness on the surface of the cut end portion 13 of the processed product 1 (this surface is a surface facing the inner peripheral surface of the first die 31). If the indentation amount D is 0.70 times or more the plate thickness t1, it becomes difficult to generate a fracture surface 13d in the subsequent finish cutting.
  • the interval CPD is the minimum value of the interval between the first die 31 and the first punch 41 at bottom dead center.
  • the amount D [mm] of the first die 31 pushed into the flange portion element 20 (that is, the flange portion 12) of the first element 2 is the first element as shown in the above equation (a3).
  • the plate thickness t1 of the flange portion element 20 (that is, the flange portion 12) of 2 may be 0.70 times or more, but may be 0.95 times or less (0.70 ⁇ t1 ⁇ D ⁇ 0. 95 x t1).
  • FIG. 7 shows a mode in which the flange portion 12 is finished and punched from the flange portion prime field 20 sandwiched by the second punch 42 and the second plate retainer 52 as one aspect of finish cutting.
  • the second die 32 constitutes a cutting die that is pushed into the flange portion prime field 20 in finish cutting.
  • the mold for pressing the portion of the flange portion 20 that becomes the flange portion 12 is the second punch 42, and the mold for pressing the removed portion 20a is the second die 32.
  • the second die 32 may be the same as the first die 31. That is, the first die 31 used in the half-cutting step may be used as the second die 32 in the finishing cutting step.
  • the positional relationship between the second die 32 and the first prime field 2 is the same as the positional relationship between the first die 31 and the first prime field 2. If these positional relationships are not the same, for example, if the diameter of the second die 32 is larger than the diameter of the first die 31, a step is generated at the cut end portion 13. On the contrary, for example, when the diameter of the second die 32 is smaller than the diameter of the first die 31, the second die 32 comes into contact with the half-cut end portion generated in the half-cutting step and wraps around the sheared surface 13c. The second die 32 may scrape off the plating layer 13f.
  • the finish cutting according to this embodiment is performed from the same direction as the half cutting. That is, when the first die 31 is pushed into the flange prime field 20 from the upper surface side of the flange prime field 20 in half-cutting as shown in FIG. 6, the flange prime field 20 is also used in finish cutting as shown in FIG. The second die 32 is pushed into the flange portion prime field 20 from the upper surface side of the above. As a result, the removed portion 20a is separated from the flange portion prime field 20. As a result, the removed portion 20a is separated from the flange portion prime field 20.
  • the clearance C 32-42 [mm] between the second die 32 and the second punch 42 is a positive clearance.
  • the clearance C 32-42 is represented by the distance between the side surface 32a of the second die 32 and the side surface 42a of the second punch 42.
  • the clearance in a state where the second die 32 and the second punch 42 are separated is called a plus clearance, and a state in which the second die 32 and the second punch 42 partially overlap each other.
  • the clearance at is called minus clearance.
  • the clearance C 32-42 between the second die 32 and the second punch 42 is 0.01 mm or more, and the removed portion 20a after half-cutting is the flange portion of the first prime field 2. It is set to 0.2 times or less the remaining plate thickness t2 remaining in the prime field 20.
  • the clearance C 32-42 is 0.01 mm or more, the second die 32 and the second punch 42 come into contact with each other and are damaged even if the slide accuracy of the press machine or the misalignment of the die occurs during finish cutting. There is no risk of doing so. On the other hand, if the clearance C 32-42 is 0.2 times or less the remaining plate thickness t2, burrs 13e are less likely to be generated.
  • the cutting edge of the second die 32 has an R shape having a radius of curvature R2. As shown in FIG. 7, since the second die 32 is pushed into the portion where the finish cutting of the flange portion element 20 is performed, the cutting edge of the second die 32 has an R shape having a radius of curvature R2.
  • the cutting edge of the second punch 42 has a square shape without roundness as shown in FIG. 7. At this time, the cutting edge of the second punch 42 may have a radius of curvature of less than 0.25 mm, less than 0.15 mm, less than 0.10 mm, or less than 0.05 mm.
  • the radius of curvature of the cutting edge of the second punch 42 may be less than 0.1 times the plate thickness t1 of the flange portion element 20 of the first element 2, and if necessary, less than 0.06 times, 0. It may be less than .04 times or less than 0.02 times.
  • the radius of curvature R2 [mm] is 0.25 mm or more and 1.50 times or less of the remaining plate thickness t2 of the half-cut portion, as shown in the following formula (6).
  • the second die 32 does not scrape off the plating layer 13f that wraps around the shear surface 13c.
  • the radius of curvature R2 is 1.50 times or less the remaining plate thickness t2, it becomes difficult to generate burrs 13e.
  • the inner diameter D 32 of the second die 32 is set to be equal to or larger than the inner diameter D 31 of the first die 31, and the cut end is formed on the inner peripheral side of the processed product 1.
  • the outer diameter d 32 of the second die 32 is set to be equal to or less than the outer diameter d 31 of the first die 31.
  • the diameter difference D 32 -D 31 or d 32- d 31 of the dies 31 and 32 is generated at the cut end portion 13 of the processed product 1 in order to carry out the two steps of the semi-cutting step and the finishing cutting step.
  • the step can be reduced and a good cut cross section can be obtained.
  • may be more than 1.00 mm.
  • of these diameter differences is preferably as small as possible, and may be 0.75 mm, 0.50 mm, 0.35 mm or 0.20 mm. good.
  • is 0 mm.
  • the step generated at the cut end portion 13 of the processed product 1 is preferably small, and may be 0.5 mm or less.
  • the upper limit of the step generated at the cut end portion 13 of the processed product 1 may be 0.4 mm, 0.3 mm, 0.2 mm or 0.1 mm, if necessary.
  • FIG. 8 is an explanatory diagram showing a half-cutting process when the cutting edge of the die and the punch used in the half-cutting process has an R shape.
  • FIG. 9 is an explanatory diagram showing a finish cutting step performed following the half-cutting step of FIG.
  • the flange portion prime field 20 of the first prime field 2 is half-cut using the first die 31 and the first punch 41.
  • FIG. 8 shows a mode in which the flange portion 12 is half-pulled from the flange portion prime field 20 sandwiched by the first punch 41 and the first plate retainer 51 as one aspect of half-cutting as in FIG.
  • the first die 31 constitutes a cutting die that is pushed into the flange portion prime field 20 in half-cutting.
  • the mold for pressing the portion of the flange portion 20 that becomes the flange portion 12 is the first punch 41
  • the mold for pressing the removed portion 20a is the first die 31.
  • the clearance C 31-41 between the first die 31 and the first punch 41 is a negative clearance. Therefore, as shown in FIG. 8, the first die 31 and the first punch 41 that half-cut the first prime field 2 are the first die 31 and the first punch 41 when viewed from the pushing direction of the first die 31. Are arranged so that they partially overlap.
  • the clearance C 31-41 to a negative clearance, it is possible to prevent the removed portion 20a from being completely cut from the flange portion prime field 20 in the semi-cutting step, and to reduce the sagging 13b.
  • the meanings of the clearance C 31-41 , the negative clearance and the plastic clearance in the present embodiment b are the same as those in the above embodiment a.
  • the compressive stress increases, and the material that originally flows to the scrap side is pushed back to the flange portion 12.
  • the material is also filled in the portion where the sagging 13b is formed after the cutting process, and the sagging 13b can be reduced.
  • the shorter the length of the material scrapped after the cutting process the more the material is from the tip of the cutting edge of the first die 31 to the first die. It is easy to flow to the side surface 31a side of 31. Therefore, the side surface 31a of the first die 31 is located within a range of not more than twice the plate thickness of the flange portion 20 (that is, the flange portion 12) from the end portion of the flange portion element 20. Place 31 and cut in half.
  • the clearance C 31-41 [mm] between the first die 31 and the first punch 41 is the flange portion element 20 (that is, the flange portion 12) of the first element 2 as shown in the following formula (b1).
  • the plate thickness is set to ⁇ 0.10 times or less and ⁇ 0.35 times or more of the plate thickness t1 [mm].
  • the clearance C 31-41 is ⁇ 0.10 times or less the plate thickness t1 of the flange portion element 20, a large hydrostatic stress is generated in the region sandwiched by the first die 31 and the first punch 41, and the tension is increased. The percentage of stress decreases. As a result, cracks are generated during the half-cutting to cause complete cutting, no large fracture surface is generated, and the removed portion 20a is completely cut from the flange portion prime field 20 in the half-cutting step. Can be avoided. On the other hand, if the clearance C 31-41 is ⁇ 0.35 times or more the plate thickness t1 of the flange portion element 20, the forming load required for half-cutting does not increase and the pressing capacity is not exceeded.
  • the clearance C 31-41 is ⁇ 0.15 times or less or ⁇ 0.20 times or less the plate thickness t1 of the flange portion element 20.
  • the clearance C 31-41 may be ⁇ 0.30 times or more or ⁇ 0.25 times or more the plate thickness t1 of the flange portion element 20.
  • the cutting edges of the first die 31 and the first punch 41 have an R shape.
  • the radius of curvature R11 [mm] of the cutting edge of the first die 31 and the radius of curvature R12 [mm] of the cutting edge of the first punch 41 are as shown in the following equations (b2-1) and (b2-2).
  • the plate thickness t1 [mm] of the flange portion element 20 (that is, the flange portion 12) of the first element 2 is 0.10 times or more and 0.65 times or less.
  • the radius of curvature R11 of the cutting edge of the first die 31 and the radius of curvature R12 of the cutting edge of the first punch 41 may be the same or different.
  • the scrap material directly under the first die 31 is the first material. It can flow from the cutting edge of the die 31 to the side surface 31a side of the first die 31. Due to this flow, in the stress generated when the first die 31 is pushed into the flange portion prime field 20, between the material that becomes scrap (that is, the removed portion 20a) after the cutting process and the flange material that becomes the flange portion 12. The proportion of tensile stress generated is reduced. As a result, it is possible to wrap around the sheared surface 13c and the plating layer 13f.
  • the radii of curvature R11 and R12 are 0.65 times or less of the plate thickness t1
  • the amount of material located at the cutting edge of the first die 31 is reduced during half-cutting, and the fracture surface 13d in the subsequent finish cutting. Generation can be reduced.
  • the amount D [mm] of the first die 31 pushed into the flange portion element 20 (that is, the flange portion 12) of the first element 2 is the flange of the first element 2 as shown in the following formula (b3). It is set to 0.70 times or more the plate thickness t1 [mm] of the prime field 20 (that is, the flange portion 12).
  • the pushing amount D is the first die from the position where the first die 31 contacts the upper surface of the flange portion element 20 of the first prime field 2 to the position where the pushing of the first die 31 is stopped (bottom dead center). It is the movement amount of 31.
  • the distance CPD [mm] between the first die 31 and the first punch 41 at the bottom dead center is set to 0.20 mm or more as shown in the following formula (b4).
  • the remaining plate thickness t2 in which the removed portion 20a remains in the flange portion element 20 of the first element body 2 after half-cutting may be 0.30 times or less the plate thickness t1 [mm] of the flange portion element 20. .. If the indentation amount D is 0.70 times or more the plate thickness t1, it becomes difficult to generate a fracture surface 13d in the subsequent finish cutting. On the other hand, by ensuring a distance CPD between the first die 31 and the first punch 41 at the bottom dead center of 0.20 mm or more, cracks occur during half - cutting and partial complete cutting occurs. You can avoid it.
  • the interval CPD is the minimum value of the interval between the first die 31 and the first punch 41 at bottom dead center.
  • half-cutting is performed as compared with the case where only one of the first die 31 or the first punch 41 has an R-shaped cutting edge.
  • the cutting amount of the flange portion element 20 in the process can be increased. That is, by making the cutting edges of the first die 31 and the first punch 41 R-shaped, as compared with the case where only one of the first die 31 or the first punch 41 has an R-shaped cutting edge as shown in FIG.
  • the remaining plate thickness t2 remaining in the flange portion prime field 20 after the half-cutting can be reduced by the removed portion 20a.
  • the cutting edge of only the first die 31 is R-shaped as in the above embodiment a
  • the pushing amount D of the first die 31 is set to the plate thickness t1 or more of the flange portion 12
  • the cutting edge of the first die 31 is the first punch. It comes into contact with the cutting edge of 41. Therefore, in the above-mentioned embodiment a, the pushing amount D of the first die 31 cannot be set to the plate thickness t1 or more of the flange portion 12.
  • the cutting edges of the first die 31 and the first punch 41 have an R shape, as shown in FIG. 8, the first die 31 until the cutting edge of the first die 31 comes into contact with the cutting edge of the first punch 41. The amount that can be pushed in is increased.
  • the cutting amount of the flange portion element 20 can be made larger than that of the form a, and the ratio of the sheared surface 13c in the cut end portion 13 can be made larger.
  • the plating layer 13f can be made to wrap around the sheared surface 13c more, and the ratio of the cut end portion 13 covered by the plating layer 13f can be increased.
  • the remaining plate thickness t2 becomes smaller, the cutting amount in the finish cutting step becomes smaller, and it is possible to avoid a state in which the plating layer does not remain in a part of the finish cut portion.
  • the finish cutting step As shown in FIG. 9, the semi-cut flange portion prime field 20 is finish cut using the second die 32 and the second punch 42.
  • the finish cutting step may be performed in the same manner as the finish cutting step shown in FIG. 7, which is performed after half-cutting with the cutting edge of only one of the first die 31 or the first punch 41 having an R shape.
  • FIG. 9 shows a mode in which the flange portion 12 is finished and punched from the flange portion prime field 20 sandwiched by the second punch 42 and the second plate retainer 52 as one aspect of finish cutting.
  • the second die 32 constitutes a cutting die that is pushed into the flange portion prime field 20 in finish cutting.
  • the mold for pressing the portion of the flange portion 20 that becomes the flange portion 12 is the second punch 42
  • the mold for pressing the removed portion 20a is the second die 32.
  • the second die 32 may be the same as the first die 31. That is, the first die 31 used in the half-cutting step may be used as the second die 32 in the finishing cutting step.
  • the positional relationship between the second die 32 and the first prime field 2 is the same as the positional relationship between the first die 31 and the first prime field 2. If these positional relationships are not the same, for example, if the diameter of the second die 32 is larger than the diameter of the first die 31, a step is generated at the cut end portion 13. On the contrary, for example, when the diameter of the second die 32 is smaller than the diameter of the first die 31, the second die 32 comes into contact with the half-cut end portion generated in the half-cutting step and wraps around the sheared surface 13c. The second die 32 may scrape off the plating layer 13f.
  • the finish cutting according to this embodiment is performed from the same direction as the half cutting. That is, when the first die 31 is pushed into the flange prime field 20 from the upper surface side of the flange prime field 20 in half-cutting as shown in FIG. 8, the flange prime field 20 is also used in finish cutting as shown in FIG. The second die 32 is pushed into the flange portion prime field 20 from the upper surface side of the above. As a result, the removed portion 20a is separated from the flange portion prime field 20.
  • the clearance C 32-42 [mm] between the second die 32 and the second punch 42 is a positive clearance.
  • the clearance C 32-42 between the second die 32 and the second punch 42 is 0.01 mm or more, and the removed portion 20a is the flange of the first prime field 2 after half-cutting. It is set to 0.2 times or less the remaining plate thickness t2 remaining in the prime field 20. If the clearance C 32-42 is 0.01 mm or more, the second die 32 and the second punch 42 come into contact with each other and are damaged even if the slide accuracy of the press machine or the misalignment of the die occurs during finish cutting. There is nothing to do. On the other hand, if the clearance C 32-42 is 0.2 times or less the remaining plate thickness t2, burrs 13e are less likely to be generated.
  • the cutting edge of the second die 32 has an R shape having a radius of curvature R2. As shown in FIG. 9, since the second die 32 is pushed into the portion where the finish cutting of the flange portion element 20 is performed, the cutting edge of the second die 32 has an R shape having a radius of curvature R2.
  • the cutting edge of the second punch 42 may be a square shape without roundness as shown in FIG. 9, or may have a radius of curvature. If the cutting edge of the second punch 42 has a square shape without roundness, the burr generated at the tip of the fracture surface 13d can be made smaller.
  • the radius of curvature of the cutting edge of the second punch 42 may be less than 1.00 mm, less than 0.50 mm, less than 0.20 mm, less than 0.10 mm, or less than 0.05 mm.
  • the radius of curvature of the cutting edge of the second punch 42 may be less than 0.3 times the plate thickness t1 of the flange portion element 20 of the first element 2, and if necessary, less than 0.1 times, 0. It may be less than 0.6 times, less than 0.04 times, or less than 0.02 times.
  • the radius of curvature R2 [mm] is 0.25 mm or more and 1.50 times or less of the remaining plate thickness t2 of the half-cut portion, as shown in the above formula (6).
  • the radius of curvature R2 is 0.25 mm or more, the second die 32 does not scrape off the plating layer 13f that wraps around the sheared surface 13c.
  • the radius of curvature R2 is 1.50 times or less the remaining plate thickness t2, it becomes difficult to generate burrs 13e.
  • the processed product manufacturing method according to the first embodiment of the present invention has been described above.
  • the first prime field 2 formed of a plated steel plate and having the flange portion prime field 20 serving as the flange portion 12 is targeted for cutting, and the clearance between the first die 31 and the first punch 41 is a negative clearance.
  • the cut end portion 13 of the flange portion 12 of the processed product 1 cut by such two steps has a sagging 13b, a sheared surface 13c, and a fracture surface 13d in this order in the plate thickness direction T of the cut end portion 13. ing. At least a part of the sheared surface 13c is covered with the plating layer 13f on the upper surface 13a. At this time, the ratio L / t1 of the residual length L of the plating component whose shear surface 13c is covered by the plating layer 13f1 to the plate thickness t1 of the cut end portion 13 of the processed product 1 is 0.70 or more.
  • the length of the sagging 13b in the plate thickness direction T of the cut end portion 13 is more than 0 times and less than 0.10 times the plate thickness t1 of the cut end portion 13 of the processed product 1.
  • the sagging 13b of the cut end portion 13 is suppressed from becoming large, and more plating layers 13f wrap around the sheared surface 13c. Even when a plated steel sheet having a plate thickness of more than 2.0 mm is used as a material, corrosion resistance and shape quality can be improved.
  • the material used for the processed product 1 can be reduced.
  • the screw hole 121 into which the screw 123 for fixing the processed product 1 is inserted is formed in the flange portion 12 so as to avoid the sagging 13b so that the screw 123 is fixed to the flat portion. Will be done.
  • the sagging X becomes large, the distance from the end portion of the flange portion 12 to the screw hole 121 becomes long, and extra material is required.
  • the processed product manufacturing method according to the present embodiment eliminates the need for an extra large blank size in order to secure a flat portion around the screw 123 required for fixing the processed product 1.
  • more plating layers 13f can be made to wrap around the sheared surface 13c, so that red rust at the cut end portion 13 generated with the passage of time after the cutting process can be suppressed. Can be done.
  • the clearance C 32-42 between the second die 32 and the second punch 42 is 0.01 mm or more, and the remaining plate thickness of the first prime field 2 (flange portion prime field 20) in the portion where the half cut is performed. It is set to 0.2 times or less of t2. As a result, it is possible to suppress the formation of burrs 13e while preventing the cutting dies from coming into contact with each other and being damaged during finish cutting.
  • the tip of the cutting edge of the second die 32 which is pushed into the portion of the first prime field 2 to be finished cut, has a residual plate thickness t2 of 0.25 mm or more and a half-cut portion.
  • a curved shape having a radius of curvature R2 of 50 times or less is provided.
  • FIG. 11 is an explanatory diagram showing a processed product manufacturing method according to the second embodiment of the present invention.
  • the processed product manufacturing method according to the present embodiment includes a preparation step, a semi-cutting step, a finish cutting step, and a coining step.
  • the processed product manufacturing method according to the present embodiment is a method in which a coining step is added to the processed product manufacturing method according to the first embodiment shown in FIG. As shown in FIG. 11, in the present embodiment as well, the semi-cutting step and the finishing cutting step are performed on the first prime field 2 prepared in the preparatory step, as in the first embodiment. Therefore, detailed description of the preparation step, the semi-cutting step, and the finish cutting step will be omitted.
  • the processed product obtained in the finish cutting process is used as the second prime field 6, and the second prime field 6 is subjected to the coining process.
  • the region of the fracture surface 13d which is a rough new surface, can be narrowed, and the region where red rust is generated can be suppressed. Further, the burrs 13e can be crushed by the coining process, and the residual burrs 13e in the processed product 1 can be more reliably suppressed.
  • FIG. 12 is an explanatory diagram showing a coining process.
  • FIG. 13 shows the cut end portion of the processed product 1 after the coining step, the left side is a cross-sectional view on a ZX plane including the central axis of the processed product 1, and the right side is a side view from the X direction.
  • FIG. 14 is a photograph showing an example of the cut end portion of the processed product 1 after the coining step. Note that, in FIG. 13, the description of the plating layer 13f is omitted as in FIG.
  • the cut end portion 13 of the second prime field 6 is sandwiched between the pad 7 and the coining block 8.
  • the pad 7 has a vertical wall surface 70, a bottom wall surface 71, and a pressing surface 72.
  • the vertical wall surface 70 is arranged so as to face the shearing surface 13c of the second prime field 6 and to be substantially parallel to the sheared surface 13c of the second prime field 6 when the cut end portion 13 of the second prime field 6 is sandwiched between the pad 7 and the coining block 8. Will be done.
  • the vertical wall surface 70 is arranged so as to be parallel to the advancing / retreating direction (Z direction in FIG. 12) of the coining block 8.
  • the bottom wall surface 71 is arranged so as to face the coining block 8 in the plate thickness direction of the flange portion 12 with the second prime field 6 interposed therebetween.
  • the bottom wall surface 71 extends in a direction orthogonal to the vertical wall surface 70 below the vertical wall surface 70 (that is, on the side opposite to the coining block 8).
  • the pressing surface 72 is a surface connecting the bottom wall surface 71 and the bottom wall surface 71.
  • the pressing surface 72 is provided on the second prime field 6 to form a coining surface (coining surface 13h in FIG. 13), and is formed in a shape corresponding to the shape of the coining surface.
  • the coining surface 13h is a flat chamfered surface (hereinafter referred to as “C surface”)
  • the pressing surface 72 is relative to the vertical wall surface 70 and the bottom wall surface 71. It may be an inclined plane.
  • the coining surface 13h is a curved surface (either a pressing surface or a compressed surface; hereinafter referred to as an “R surface”)
  • the pressing surface 72 may be a curved surface.
  • the cutting end portion 13 of the second prime field 6 is opposed to the vertical wall surface 70 of the pad 7, and the coining block 8 and the bottom wall surface 71 of the pad 7 are used for the second step.
  • the prime field 6 is sandwiched in the plate thickness direction T.
  • the coining block 8 is pushed toward the bottom wall surface 71, and the second prime field 6 is pushed down to a position where the bottom surface 13k of the second prime field 6 is in contact with the bottom wall surface 71.
  • the corner portion 13g is pressed against the pressing surface 72.
  • the coining block 8 After the corner portion 13g is pressed against the pressing surface 72, the coining block 8 is further pushed in, and the bottom surface 13k of the second prime field 6 comes into contact with the bottom wall surface 71. The corner portion 13g is crushed by the pressing surface 72 to become the coining surface 13h.
  • the cut end portion 13 of the processed product 1 after the coining step is in a state as shown in the photograph of FIG. 14, for example.
  • the coining surface 13h is a smooth surface to which the surface of the pressing surface 72 is transferred, and red rust is less likely to occur as compared with the rough surface fracture surface 13d. It is considered that the smooth surface roughness makes it difficult for water to stay on the coining surface 13h. Further, it is considered that red rust is less likely to occur because the plating layer 13f on the bottom surface 13k side of the cut end portion 13 is thinly stretched on the coining surface 13h.
  • the fracture surface length W2 in the plate thickness direction T of the flange portion 12 after the coining processing is the flange portion before the coining processing.
  • the fracture surface length W1 (see FIGS. 2 and 3) related to the plate thickness direction T in 12. That is, by the coining process, the region of the fracture surface 13d, which is a rough new surface, can be narrowed, and the region where red rust is generated can be suppressed. Further, the burrs 13e can be crushed by the coining process, and the residual burrs 13e in the processed product 1 can be more reliably suppressed.
  • the length (fracture surface length) W2 of the fracture surface 13d between the sheared surface 13c and the coining surface 13h in the plate thickness direction T of the flange portion 12 of the processed product 1 is set to more than 0 mm and 0.5 mm or less.
  • the pressing surface 72 is pressed against the corner portion 13 g so as to do so.
  • the second prime field 6 having a fracture surface length W1 related to the plate thickness direction T of less than 1.0 mm it is preferable to obtain the second prime field 6 having a fracture surface length W1 related to the plate thickness direction T of less than 1.0 mm.
  • the fracture surface length W2 can be more reliably set to 0.5 mm or less in the coining step.
  • the fracture surface length W2 of the processed product 1 is preferably small, and may be 0.4 mm or less or 0.3 mm or less. It is more preferable that the fracture surface length W2 of the processed product 1 is 0.2 mm or less or 0.1 mm or less.
  • the ratio W2 / t1 of the fracture surface length W2 and the plate thickness t1 of the cut end portion 13 of the processed product 1 is less than 0.15, less than 0.10, less than 0.08, less than 0.06, or 0. It may be less than 04.
  • the fracture surface length W2 of the processed product 1 may be 0 mm. That is, the cut end portion 13 of the processed product 1 does not have to have the fracture surface 13d. That is, as shown in FIG. 13, for example, the cut end portion 13 may have a sagging 13b, a sheared surface 13c, a fracture surface 13d, and a coining surface 13h in this order in the plate thickness direction of the cutting end portion 13. Alternatively, the cut end portion 13 may have a sagging 13b, a shearing surface 13c, and a coining surface 13h in this order in the plate thickness direction of the cutting end portion 13.
  • FIG. 15 is an explanatory view showing the volume of the corner portion 13 g crushed by the pressing surface 72 of the pad 7 of FIG.
  • the corner portion 13 g comes into contact with the pressing surface 72 and is crushed.
  • the material (base steel) of the crushed corner portion 13 g moves to the sheared surface 13c side along the pressing surface 72.
  • the volume V1 of the corner portion 13 g crushed by the pressing surface 72 is surrounded by the extension surface 13j of the shear surface 13c, the fracture surface 13d, and the pressing surface 72, and the volume V2 of the coining space.
  • the fracture surface 13d of the cut end portion 13 of the flange portion 12 is inclined with respect to the vertical wall surface 70, and there is a gap between them.
  • the volume V2 of the coining space created by this gap is a space into which the material of the corner portion 13 g crushed by the pressing surface 72 flows.
  • the material of the corner portion 13 g crushed by the pressing surface 72 cannot fit in the volume V2 and the pad. It will move toward the top of 7.
  • the processed product manufacturing method according to the second embodiment has been described above. According to the present embodiment, as in the first embodiment, it is not necessary to make the blank dimension extra large in order to secure the flat portion around the screw 123 necessary for fixing the processed product 1. Further, since more plating layers 13f can be circulated around the sheared surface 13c, red rust at the cut end portion 13 that occurs with the passage of time after the cutting process can be suppressed.
  • the region of the fracture surface 13d which is a rough new surface, can be narrowed, and the region where red rust is generated can be suppressed.
  • the burrs 13e can be crushed by the coining process, the residual burrs 13e in the processed product 1 is less than 0.2 mm, and the residual burrs 13e can be suppressed more reliably.
  • the length of the burr 13e is preferably less than 0.1 mm, more preferably less than 0.05 mm or less than 0.01 mm. It is most preferable that the length of the burr 13e is 0 mm, that is, the burr 13e does not exist in the processed product 1.
  • the processed product 1 may be, for example, an annular flat washer 900 as shown in FIG. Further, the processed product 1 may be, for example, flat washers 910A, 910B, 910C having tooth portions 911 as shown in FIG. Alternatively, the processed product 1 may be, for example, an annular disc spring 920 having a corrugated shape as shown in FIG. The disc spring 920 of FIG. 18 can be manufactured by processing, for example, the flat washer 900 shown in FIG. 16 into a corrugated shape. Further, the processed product may be a disc spring 930 having a tooth portion 931 as shown in FIG. 19, for example.
  • the outer peripheral portion and the inner peripheral portion thereof are the cut end portions 13.
  • the processed product manufacturing method according to the above embodiment, at least one of the outer peripheral portion and the inner peripheral portion is plated with the sheared surface 13c covered with the plating layer 13f1 in the plate thickness direction T of the processed product 1.
  • the ratio L / t1 of the residual component length L to the plate thickness t1 of the cut end portion 13 of the processed product 1 is 0.70 or more, and the length of the sagging 13b is the plate thickness of the cut end portion 13 of the processed product 1. It can be less than 0.10 times t1.
  • FIG. 20 is a schematic view showing an example of a cutting die for processing a flat washer 900.
  • FIG. 21 is a schematic view showing a state in which the prime field 9 is punched out by the cutting die of FIG. 20.
  • the cutting die shown in FIG. 20 is a die for manufacturing an annular processed product 90 such as a flat washer 900, and is a hollow cylindrical die (hereinafter referred to as “outer die”) 61 and a cylinder. It has a die of shape (hereinafter referred to as “inner die”) 63 and a hollow cylindrical punch 65 that supports a disk-shaped element 9 (see FIG. 21).
  • the outer die 61 and the inner die 63 are provided so as to face the punch 65, and the outer die 61 and the inner die 63 are pushed into the prime field 9 supported by the punch 65 to cut the prime field 9.
  • the inner diameter of the outer die 61 corresponds to the outer diameter of the processed product 90
  • the outer diameter of the inner die 63 corresponds to the inner diameter of the processed product 90.
  • the cutting edge of the inner peripheral surface of the outer die 61 and the cutting edge of the outer peripheral surface of the inner die 63 have an R shape having a radius of curvature.
  • the edges of the inner peripheral surface and the outer peripheral surface of the punch 65 do not have an R shape.
  • the portion 9a on the outer side of the outer peripheral surface 91 of the processed product 90 is cut by the outer die 61, and the inside of the processed product 90 is cut.
  • the portion 9b on the inner side of the peripheral surface 92 is cut by the inner die 63.
  • the processed product 90 flat washer 900
  • the sheared surfaces of the outer peripheral surface 91 and the inner peripheral surface 92 of the processed product 90 are the ratio L of the residual length L of the plating component covered by the plating layer to the plate thickness t1 of the cut end portion of the processed product 90.
  • / T1 is 0.70 or more, and the length of sagging in the plate thickness direction of the cut end portion can be less than 0.10 times the plate thickness t1 of the cut end portion of the processed product 90.
  • the processed product 1 may be, for example, a disk-shaped plate 940 as shown in FIG. 22.
  • Example a When only the cutting edge of the die used in the half-cutting process has an R shape, Samples of processed products were prepared by the methods shown in FIGS. 5 and 11 with the shoulder portion (that is, the cutting edge) of the die in the half-cutting step as an R shape having a predetermined radius of curvature.
  • a plated steel sheet As a plated steel sheet, a Zn-6% Al-3% Mg (mass ratio) alloy having a thickness of 1.4 to 3.8 mm and a plating adhesion of 90 g / m 2 (one side) or 190 g / m 2 (one side). A plated steel plate was used.
  • the semi-cutting process was performed by using a round die having an inner diameter D 31 of 85.00 mm and a punch whose diameter was changed according to the clearance between the die and the punch, and holding the plated steel plate by holding the plate.
  • the finish cutting process uses a die having an R shape whose shoulder (that is, the cutting edge) has a predetermined radius of curvature, and a punch whose diameter D 32 is changed according to the clearance C 32-42 between the die and the punch.
  • the plated steel sheet was held by pressing.
  • sagging Z, sagging X, fracture surface length (W1) after finish cutting, and fracture surface length (W2) after coining processing were measured. These were measured on the circumference of the end face of the processed product at intervals of 30 ° using a microscope, and the measured values of a total of 12 points were averaged. Further, for each sample, regarding the wraparound of the plating layer to the cut end portion, the length L of the wraparound of the plating layer in the thickness direction of the plated steel sheet was measured from the cross section of the central portion of the immediate side portion of the processed product. An electron probe microanalyzer (EPMA-WDS) was used to measure the length L of the plating layer at the cut end. It was determined that the plating layer was present in the portion where the detection level of the Zn component was 3 times or more the background.
  • the measurement target is a processed product after finish cutting or a second prime field and a processed product after coining processing.
  • the sagging, shearing surface, fracture surface and coining surface are as shown in FIG. 14, and more specifically appear as follows.
  • Dripping appears as a smooth surface formed by pulling the surface of the work material by applying a compression (pressurization) force after the die comes into contact with the work material.
  • a compression pressurization
  • FIG. 3 when the cut end portion is viewed from the side, it has a shape having a curvature.
  • the sheared surface appears as a smooth surface at the cut end.
  • the sheared surface is generated by rubbing against the side surface of the die by applying a compressive (pressurizing) force after the die comes into contact with the workpiece and biting into the workpiece.
  • the sheared surface has a metallic luster because it is rubbed against the die. On the sheared surface, fine streaky sliding scratches are seen in the plate thickness direction.
  • the fracture surface is a surface where cracks generated in the work material from the sheared surface side are associated and broken, and appears as a dull and rough surface.
  • the die further bites into the work material after the sheared surface is formed on the work material, the work material is cracked by the cutting edge of the punch, and the work material is also cracked by the cutting edge of the die. Cracks generated from punches and dies meet and penetrate each other.
  • the surface formed by the cracks is the fracture surface.
  • the fracture surface is formed without contact between the punch and the die, resulting in a dull, rough surface.
  • the fracture surface has an inclination according to the gap (clearance) between the punch and the die.
  • the coining surface appears as a smooth surface in which the unevenness of the fracture surface is crushed.
  • the coining surface is obtained by pressing an inclined or curved coining die from the lower surface side of the fracture surface end portion against the fracture surface corner portion.
  • the coining surface becomes a smooth surface in which the unevenness of the fracture surface is crushed by transferring the surface roughness of the coining die.
  • the shape profile of the cut end is observed and measured from the appearance with a microscope or a contracer based on the above characteristics. There are methods and so on.
  • the one with a sagging Z of less than 0.10 times is referred to as "A (possible)", and the one with a sagging Z of 0.10 times or more is referred to as "B (impossible)”. It was evaluated. Regarding burrs that cause dents and electrical short circuits, those with a size of less than 0.2 mm are “A (possible)", those with a size of 0.2 mm or more, or whiskers-like burrs are generated. The thing was evaluated as “B (impossible)”. Further, it is desirable that the step on the end face is not generated as much as possible in terms of appearance and product dimensional accuracy. Therefore, those having a step of 0.5 mm or less on the end face were evaluated as “A (possible)", and those having a step of more than 0.5 mm were evaluated as "B (impossible)”.
  • the sample was subjected to an air exposure test outdoors, and the number of days until conspicuous red rust was generated at the cut end was observed every 15 days.
  • Table 1 also shows the plated steel sheet used for each sample, the conditions of the semi-cutting process and the finish cutting process, and the presence or absence of coing at the corners of the cut end.
  • the plate thickness ratio (R1 / t1, R2 / t2) of the radius of curvature of the die is the roundness given to the shoulder portion of the die divided by the plate thickness. If the shoulder (blade edge) of the die is not intentionally rounded, " ⁇ 0.01" is written in this column.
  • the residual length L of the plating component with respect to the plate thickness t1 at the cut end is 0.70 times or more, and the size of the sagging Z appearing in the plate thickness direction.
  • the fracture surface length W1 of the cut end portion was 1.0 mm or less, and Examples a1 to a19 showed good corrosion resistance for 60 days until the occurrence of red rust.
  • the size of the sagging X appearing in the plane direction was less than 0.30 times the plate thickness t1 of the cut end portion of the processed product.
  • Examples a1 to a16 in which the fracture surface length W1 of the cut end portion was 0.5 mm or less good corrosion resistance of 90 days or more until the occurrence of red rust was shown.
  • the residual length L of the plating component with respect to the plate thickness t1 of the cut end portion of the processed product was 0.80 times or more, and the fracture surface length (W1) was in the range of 0.5 mm or less. ..
  • a coining process is performed to form an R-faced coining surface having a crushed side length (width of the coining surface) of 0.6 mm.
  • a coining process is performed to form a C-faced coining surface chamfered at an angle of 45 ° with the length of the crushed side (width of the coining surface) set to 1.0 mm.
  • the fracture surface length (W2) after the coining process is smaller than the fracture surface length W1 of the other examples.
  • is 0.05 mm in Examples a1 to a17 and zero in Example a18. (The diameter D 31 and the diameter D 32 are the same), and in Example a19, the diameter was 1.00 mm, but in each case, the step on the end face was 0.5 mm or less.
  • Examples a1 to a14, a18, and a19 have sagging, shearing surface, and fracture surface in order in the plate thickness direction, and the cut ends of Examples a15 and a16 are in the plate thickness direction. It was confirmed from the appearance that it had sagging, shearing surface, fracture surface and coining surface in order based on the above-mentioned characteristics.
  • Comparative Examples a1 to a5, a8, a10 to a13, and a16 the residual length L of the plating layer component with respect to the plate thickness t1 at the cut end of the processed product was less than 0.70 times, so that the cut was cut. The number of days until red rust occurred at the end was less than 60 days, and the corrosion resistance was inferior to that of the examples.
  • Comparative Example a9 a large negative clearance was adopted in the half-cutting process, but the load was exceeded in the half-punching process using a 750 kN mechanical press machine, and the press machine stopped.
  • Comparative Examples a14 and a15 both showed good corrosion resistance for 90 days or more until the occurrence of red rust at the cut end, but large burrs of 0.2 mm or more were generated at the cut end.
  • Comparative Example a6 the number of days until red rust occurred at the cut end showed good corrosion resistance of 90 days or more, but the size of the sagging Z appearing in the plate thickness direction was 0.10 times or more the plate thickness of the flange material.
  • the size of the sagging X that appears in the plane direction is 0.30 times or more the plate thickness of the processed product, and the flange size must be increased by that amount when screwing.
  • Comparative Example a7 the clearance between the die and the punch in the half-cutting step was set to zero, and the plated steel sheet was completely broken in the half-cutting step.
  • Example b When the cutting edge of the die and punch used in the half-cutting process has an R shape, a sample of the processed product was prepared by the method shown in FIGS. 5 and 11 with the shoulder portion (that is, the cutting edge) of the die and the punch in the half-cutting step as an R shape having a predetermined radius of curvature.
  • a plated steel sheet a Zn-6% Al-3% Mg (mass ratio) alloy having a thickness of 1.4 to 4.5 mm and a plating adhesion of 90 g / m 2 (one side) or 190 g / m 2 (one side). A plated steel plate was used.
  • the semi-cutting process was performed by using a round die having an inner diameter of 85.00 mm and a punch whose diameter was changed according to the clearance between the die and the punch, and holding the plated steel plate by holding the plate.
  • an R-shaped die whose shoulder (that is, the cutting edge) has a predetermined radius of curvature and a punch whose diameter is changed according to the clearance between the die and the punch are used, and the plated steel plate is held by holding the plate. I went.
  • Example b For each sample, flatness evaluation, burr evaluation, and step evaluation were performed in the same manner as in Example a above, and the number of days of red rust occurrence by the air exposure test was investigated. The results of Example b are shown in Table 2.
  • the residual length L of the plating component with respect to the plate thickness t1 of the cut end portion of the processed product is 0.70 times or more, and the sagging Z appearing in the plate thickness direction.
  • the fracture surface length of each of the cut ends was 1.0 mm or less, and Examples b1 to b19 showed good corrosion resistance for 60 days until the occurrence of red rust.
  • the size of the sagging X appearing in the plane direction was less than 0.30 times the plate thickness t1 of the cut end portion of the processed product.
  • the residual length L of the plating component with respect to the plate thickness t1 of the cut end portion of the processed product is 0.80 times or more and the fracture surface length (W1) is 0.5 mm or less. It was in the range and showed good corrosion resistance for 90 days or more until the occurrence of red rust. Further, in Example b16, after finishing and punching, a coining process is performed to form a coining surface of an R surface having a length of a side to be crushed (width of the coining surface) of 0.6 mm.
  • Example b17 after finishing punching, a coining process is performed to form a C-faced coining surface chamfered at an angle of 45 ° with the length of the crushed side (width of the coining surface) set to 1.0 mm.
  • the fracture surface length (W2) after the coining process was smaller than that of the other examples.
  • is 0.05 mm in Examples b1 to b17, and in Example b18. It was set to zero (the diameter D 31 and the diameter D 32 are the same) and 1.00 mm in Example b19, but in each case, the step on the end face was 0.5 mm or less.
  • Examples b1 to b15, b18, and b19 have sagging, shearing surface, and fracture surface in order in the plate thickness direction, and the cut ends of Examples b16 and b17 are in the plate thickness direction. It was confirmed from the appearance that it had a sagging surface, a sheared surface, a fracture surface and a coining surface in this order based on the above-mentioned characteristics.
  • Comparative Example b5 a large negative clearance was adopted in the half-cutting process, but the load was exceeded in the half-punching process using a 750 kN mechanical press machine, and the press machine stopped.
  • Comparative Examples b9 and b10 both showed good corrosion resistance for 90 days or more until the occurrence of red rust at the cut end, but large burrs of 0.2 mm or more were generated at the cut end.
  • Comparative Examples b3 and b12 the negative clearance between the die and the punch in the half-cutting step was not sufficient, so that the plated steel sheet was completely broken in the half-cutting step.
  • the residual length L of the plating component is 0.70 times the shape of the cut end portion with respect to the plate thickness t1 of the cut end portion of the processed product. From the above, it was confirmed that a cut end portion having good corrosion resistance can be obtained. Further, by setting the sagging Z appearing in the plate thickness direction of the cut end to be less than 0.10 times the plate thickness t1 of the cut end of the processed product, the product does not need to increase the flange size when screwing. Was confirmed to be obtained.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Punching Or Piercing (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Shearing Machines (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)

Abstract

Produit traité utilisant, en tant que matériau de base, une feuille d'acier plaquée qui présente une couche de placage dans la surface, tout en ayant une extrémité coupée qui s'étend dans le sens de l'épaisseur de feuille du produit traité. L'extrémité coupée présente séquentiellement, dans le sens de l'épaisseur de feuille de l'extrémité coupée, un affaissement, une surface de cisaillement et une surface de rupture, ou en variante, un affaissement et une surface de cisaillement ; le rapport de la longueur restante de composant de placage L, la surface de cisaillement étant recouverte par la couche de placage dans la surface, à l'épaisseur de feuille t1 de l'extrémité coupée du produit traité, à savoir L/t1 est de 0,70 ou plus ; et la longueur Z de l'affaissement dans le sens de l'épaisseur de feuille de l'extrémité coupée est supérieure à 0 fois mais inférieure à 0,10 fois l'épaisseur de feuille t1 de l'extrémité coupée du produit traité.
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WO2025004910A1 (fr) * 2023-06-27 2025-01-02 日本製鉄株式会社 Procédé de fabrication d'un article traité métallique et article traité métallique
WO2025018081A1 (fr) * 2023-07-14 2025-01-23 日本製鉄株式会社 Procédé de fabrication d'un produit traité par un métal, et produit traité par un métal
TWI872719B (zh) * 2022-09-29 2025-02-11 日商日本製鐵股份有限公司 切斷加工品及護欄
TWI903586B (zh) 2023-06-27 2025-11-01 日商日本製鐵股份有限公司 金屬製加工品的製造方法及金屬製加工品

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