TW201706048A - Protrusion molding device, protrusion molding method, and molded article - Google Patents

Abstract

Provided are a protrusion molding device, a protrusion molding method, and a molded article, with which a height equal to or greater than the plate thickness is possible, the edges are sharp, and cracking can be prevented. This protrusion molding device (1) is characterized by being equipped with a die unit (12) provided with a die hole (12a), and a punch unit (40) having a large punch part (41) with a size such that this part cannot be inserted into the die hole (12a), and a small punch part (42) that protrudes from the large punch part (41) toward the die unit (12) and can be inserted into the die hole (12a), and characterized in that the workpiece (W) is deformed by pressing a portion of the workpiece arranged between the die unit (12) and the punch unit (40) toward the die unit (12) by means of the punch unit (40), thereby forming a protrusion (W1).

Description

Projection forming device, projection forming method, and molded article

The present invention relates to a protrusion forming device, a protrusion forming method, and a molded article.

When the projection is formed on a plate-shaped workpiece such as a steel sheet, when the height of the projection is much larger than the thickness of the sheet, it is necessary to perform drawing processing to form the projection. However, if the drawing process is to be performed, the distance between the side surface of the punch and the inner surface of the die hole must be greater than the plate thickness. Further, in the case of performing the drawing process, the R value of the (circular) corner portion of the punch and the die is made large. Therefore, the formed protrusion cannot have a sharp edge.

In the case where the formed projection has a sharp edge, it is necessary to perform molding by half blanking by a fine blanking method. The precision blanking method is a method in which a compressive force is applied to a workpiece to cause plastic deformation to perform high-precision shear processing. However, if a precision blanking method is used, it is not easy to make the height of the formed protrusion part more than a plate thickness. This is because the diameter of the punch is generally approximately the same as the diameter of the die. If the height of the projection is to be equal to or greater than the thickness of the projection, the workpiece cannot be cut by shearing and processed.

Therefore, a technique has been developed (refer to Patent Document 1), in which a punch having a diameter smaller than that of the die is pressed against the object to be processed, and the bottom surface of the workpiece is introduced into the die hole while forming the recess. The workpiece is pressed by a punch and a punch press, and a cold forging die is used for the quasi-feeding process to cause compression deformation on the pressing portion.

[Prior Art Document] (Patent Document) Patent Document 1: Japanese Patent No. 3333363

[Problem to be Solved by the Invention] However, in the above prior art, the strength of the portion of the object to be processed which is sandwiched by the punch and the die hole is insufficient, and cracks may occur in this portion. An object of the present invention is to provide a projection forming apparatus, a projection forming method, and a molded article. The projection forming apparatus and the projection forming method can form a height equal to or greater than a thickness and a sharp edge, and further prevent occurrence of cracks.

[Technical means for solving the problem] The present invention provides a protrusion forming apparatus including: a mold portion provided with a die hole; and a punch head that can advance and retreat in a first direction toward the mold portion side, and has a large punch head having a size that cannot be inserted into the hole of the mold, the small punch head protruding from the large punch head toward the side of the mold portion, and having the foregoing a size of the mold hole; wherein a part of the workpiece to be placed between the die portion and the punch head is pressed against the die portion side by the punching head to cause the workpiece to be processed The protrusion is formed by deformation.

In the protrusion forming device, the distance d1 between the side surface of the small punch head and the side surface of the large punch head, and the distance d2 between the side surface of the small punch head and the inner surface of the die hole preferably have The relationship of d2 < d1.

In the projection forming apparatus, the distance d2 between the side surface of the small punch head and the inner surface of the die hole and the thickness T of the workpiece are preferably in a relationship of d2 < T.

Preferably, the bottom surface of the small punch head is provided with a slope which is inclined in a direction in which the thickness of the small punch head is thinned toward the edge portion of the small punch head.

The present invention relates to a method of forming a protrusion, comprising: a placing step of placing a workpiece on a mold portion, wherein the mold portion is provided with a mold hole; and, a stamping step, which has a large punch head and a small portion The punching head of the punching head moves in a first direction toward the mold portion side, and a part of the workpiece to be disposed between the die portion and the punching head is formed by the punching head, Pressing the mold portion side to deform the workpiece to form a protrusion; wherein the large punch head has a size that cannot be inserted into the mold hole, the small punch head is from the large punch head toward the foregoing The mold portion protrudes side and has a size that can be inserted into the aforementioned mold hole.

In the above-described protrusion forming method, the distance d1 between the side surface of the small punch head and the side surface of the large punch head, and the interval d2 between the side surface of the small punch head and the inner surface of the die hole preferably have The relationship of d2 < d1.

In the above-described protrusion forming method, the distance d2 between the side surface of the small punch head and the inner surface of the die hole and the thickness T of the workpiece are preferably in a relationship of d2 < T.

In the above-described protrusion forming method, the pressing step includes: a first step of forming a protrusion by providing a punched head having a slope provided on a bottom surface of the small punch head and facing the aforementioned The edge portion of the small punch head is inclined in a direction in which the thickness of the small punch head is thinned; and, in the second step, the protrusion portion is formed by a punching head portion of the bottom surface of the small punch head.

Further, the molded article of the present invention includes: a flat portion having a thickness T; and a protruding portion protruding from one surface side of the flat portion; and a surface of the protruding portion of the molded article on the other surface side of the molded article: a recess having a first width S1; and a second recess formed more concavely from the first recess and having a second amplitude S2; wherein a thickness d2 of the sidewall portion of the second recess and the foregoing The thickness T of the flat portion satisfies the relationship of d2 < T.

In the molded article, when the height from the one surface side of the flat portion to the top surface of the one surface side of the protruding portion is H, it can be formed by H≧T.

Further, in the molded article, the width S1 of the first concave portion, the width S2 of the second concave portion, and the width S3 of the protruding portion on the one surface side preferably satisfy the relationship of S2 < S3 < S1.

[Effects of the Invention] It is possible to provide a projection forming device, a projection forming method, and a molded article which can have a height equal to or greater than a thickness and a sharp edge, and further prevent occurrence of cracks.

(First Embodiment) Hereinafter, the overall structure of the protrusion forming apparatus 1 according to the embodiment of the present invention will be described based on the drawings. The projection forming apparatus 1 is a device for forming a projection on a plate-shaped workpiece W such as a steel sheet, and the first (a) diagram shows the workpiece W placed on the projection molding apparatus 1. FIG. 1(b) is a schematic view showing a state in which the projection W1 of the workpiece W placed on the projection forming apparatus 1 is molded.

The projection forming apparatus 1 of the present embodiment is used when the projection W1 is to be formed, for example, on a seat gear shown in Fig. 2 . Fig. 2(a) is a photograph of the gear holder on which the projection portion W1 facing downward is viewed from below, and Fig. 2(b) is a photograph of the gear holder on which the projection portion W1 facing downward is provided as viewed from above. In order to increase the efficiency of the rotational moment of the gear holder, it is preferable to set the surface area of the contact portion W1 on the contact side with the die hole 12a to be large. In the following description, the case where the formed protrusion W1 shown in FIG. 2(b) is in a state of protruding downward is described.

The protrusion forming device 1 includes a fixing portion 10, a moving portion 30 that moves up and down with respect to the fixing portion 10, and a pressing portion 50 that is held in the moving portion 30 and further moved relative to the moving portion 30. mobile. In addition, the upper and lower sides are the directions of the arrows shown in Fig. 1 . Hereinafter, in the present specification, the direction in which the moving portion 30 approaches the fixed portion 10 is downward (first direction), and the direction in which the moving portion 30 is separated from the fixed portion 10 is upward.

The fixing portion 10 includes a mold holder 11, a mold portion 12, and a guide post 13. The mold holder 11 is manufactured using a roughly rectangular thick plate member. Further, the shape of the mold holder 11 is not limited to a rectangular shape, and a through hole 11a is provided in a central portion of the mold holder 11. The guide post 13 extends from the outer peripheral portion of the die holder 11 toward the upper side of the drawing. In the present embodiment, for example, four guide columns 13 are provided (only two of them are shown in the drawings).

The mold portion 12 is fixed to the top surface of the mold holder 11 and disposed further inside than the guide post 13 . The mold portion 12 is a metal member of a fixed thickness, and a mold hole 12a corresponding to the shape of the protrusion W1 to be formed by the protrusion forming device 1 is provided at the center portion. Further, a plurality of guide holes 12b are provided outside the die hole 12a of the mold portion 12.

Inside the mold hole 12a, a female mold portion 20 having a shape and a similar shape to the mold hole 12a is disposed, and the concave mold portion 20 is for determining the height of the protrusion portion W1. On the bottom surface of the female mold portion 20, an upper end of a rod-shaped knock out member 21 is attached, and the ejecting member 21 can be used to discharge the workpiece W. The lower end of the ejector member 21 extends below the through hole 11a provided in the die holder 11, and is connected to a drive mechanism (not shown). The drive mechanism pushes the female mold portion 20 upward via the ejector member 21.

The moving unit 30 includes a punch holder 31, a backing plate 32, and a guide pin 36.

The punch holder 31 is manufactured by using a thick plate member having approximately the same size as the mold holder 11. A first through hole 31a is provided at a position on the outer peripheral portion of the punch holder 31 corresponding to the above-described guide post 13. In the first through hole 31a, a push guide cylinder 31c is inserted and fixed. The push guide cylinder 31c is a cylindrical material and extends below the punch holder 31. The guide post 13 is inserted into the inside of the push guide cylinder 31c, and the push guide cylinder 31c moves along the outer circumference of the guide post 13, thereby ensuring that the moving portion 30 can be stably moved up and down with respect to the fixed portion 10.

A plurality of second through holes 31b are provided on the punch holder 31 on the inner side of the pressing guide cylinder 31c.

The backing plate 32 is attached to the bottom surface of the punch holder 31 and located further inside than the installation position of the pressing guide cylinder 31c. At the position corresponding to the second through hole 31b of the backing plate 32, two holes 33 are provided continuously with the second through hole 31b. The second hole 33 includes a first hole 33a and a second hole 33b. The first hole 33a and the second through hole 31b have the same axis, and are continuous (connected) with the second through hole 31b. The two through holes 31b have the same diameter, and the second holes 33b and the second through holes 31b have the same axis, are disposed below the first holes 33a, and have a smaller diameter than the first holes 33a.

The guide pin 36 is attached to the bottom surface of the backing plate 32, is located on the outer peripheral side of the two-stage hole 33, and extends downward from the backing plate 32.

The punch head 40 is fixed to the bottom surface of the center portion of the backing plate 32. As will be described in detail later, the punch head 40 includes a large punching head 41 on the side of the backing plate 32 and a small punching head 42 on the side of the workpiece W.

The pressing portion 50 includes a bolt member 34, a pressing plate 37, and a coil spring 35. The bolt member 34 has a head portion 34a and an extending portion 34b. The diameter of the head portion 34a is smaller than the diameter of the second through hole 31b and the first hole 33a, and is larger than the diameter of the second hole 33b. The diameter of the portion 34b is smaller than the diameter of the second hole 33b. The bolt member 34 has its head portion 34a positioned upward, and its extending portion 34b is inserted into the second through hole 31b, the first hole 33a, and the second hole 33b, and is screwed into the pressing plate 37.

The coil spring 35 is disposed at a portion of the bolt member 34 that protrudes from the backing plate 32 (the bolt member 34 is inserted into the coil spring 35).

The pressing plate 37 is disposed on the outer peripheral side of the punch head 40. The pressing plate 37 is a thick plate member, and a first opening portion 37a is formed at a central portion thereof, and the first opening portion 37a is approximately the same in diameter as the large punching head portion 41 of the punching head 40, so that the large punching head portion 41 can be The sliding contact is made in the first opening portion 37a. On the outer peripheral side of the first opening portion 37a of the top surface of the pressing plate 37, a bottomed bolt fixing screw portion 37b is provided. The threaded portion 37b is provided at a position corresponding to the extending portion 34b of the bolt member 34, and the front end of the extending portion 34b is inserted and fixed in the threaded portion 37b. The coil spring 35 is disposed on the outer circumference of the extending portion 34b and is located between the backing plate 32 and the pressing plate 37. Further, on the outer peripheral side of the first opening 37a of the pressing plate 37, a second opening 37c is provided at a position corresponding to the guide pin 36. The guide pin 36 is inserted into the second opening portion 37c. The lower end of the guide pin 36 is further inserted into the guide hole 12b of the mold portion 12, and the guide pin 36 is linearly advanced (straight forward and backward) by the guide hole 12b of the mold portion 12 and the second opening portion 37c.

The workpiece W is placed on the mold portion 12. The workpiece W is, for example, hot rolled steel plates (SPFH590) for automobiles.

When the projection is formed on the workpiece W, the workpiece W is placed on the mold portion 12. At this time, the position of the workpiece W is determined such that the projection forming portion is positioned on the die hole 12a. In addition, the moving part 30 of the protrusion forming apparatus 1 at this time is a position higher than the state of the 1st (a) figure. Then, the moving portion 30 is lowered by a driving mechanism (not shown) so that the pressing plate 37 abuts against the workpiece W. Then, the moving portion 30 is lowered, and as shown in Fig. 1(a), the bottom surface of the small punch head 42 of the punch head 40 is brought into contact with the workpiece W.

Next, the moving unit 30 is further pushed downward by the drive mechanism. Thereby, the punching head 40 is further lowered so that the small punching head 42 and the large punching head 41 press the workpiece W. As shown in Fig. 1(b), plastic deformation occurs in the workpiece W to form a projection W1 having a desired shape. Thereafter, the moving portion 30 is raised to separate the workpiece W from the small punch head 42 and the large punch head portion 41, and the die portion 20 is pushed up by the ejector member 21. In this way, the projection W1 of the workpiece W is pushed out from the die hole 12a, and the workpiece W can be taken out.

Fig. 3 is an enlarged view of a portion A of Fig. 1(b) after the projection W1 is formed. Fig. 4 is a partial cross-sectional view showing the molded article W01 in which the projection W1 is formed. In the present embodiment, as shown in Fig. 3, the distance d1 between the side surface of the small punch head 42 and the side surface of the large punch head 41, and the interval d2 between the side surface of the small punch head 42 and the inner surface of the die hole 12a are shown. , having a relationship of d2 < d1 (1).

In other words, the amplitude S1 of the large punch head 41, the amplitude S2 of the small punch head 42, and the amplitude S3 of the die hole 12a in the predetermined cross section have a relationship of S2 < S3 < S1 (2). (S1-S2)/2=d1, (S3-S2)/2=d2, and S3<S1 according to the equation (2), so that d2<d1 of the above formula (1) can be obtained.

Further, in the present embodiment, the distance d2 between the side surface of the small punch head 42 and the inner surface of the die hole 12a when inserted into the die hole 12a is less than (less than) the plate thickness T of the workpiece W. T>d2......(3)

Moreover, as shown in FIG. 4, when the molded article W01 is viewed, the molded article W01 includes a flat portion W2 having a thickness T, and a projection W1 protruding further downward than the one surface A side of the flat portion W2. And the thickness is T; and the rising portion P2 rises from the flat portion W2 to the protruding portion W1. The distance d2 between the side surface of the small punch head 42 and the inner surface of the die hole 12a when inserted into the die hole 12a can be said to be the thickness of the rising portion P2 in the direction orthogonal to the thickness (T) direction of the flat portion W2. D2. As described above, the relationship of T>d2 (3) is satisfied.

Further, the height H from the one surface A of the flat portion W2 to the one surface B of the projection portion W1 is relative to the thickness T of the workpiece W. It can satisfy the relationship of H≧T...(4).

Further, the portion on the opposite side to the one surface B of the projection W1 becomes a concave portion due to the pressing of the punch portion 40. The recess has a first recess D1 having a first amplitude S1 that is approximately the same as the amplitude S1 of the large punch head 41; and a second recess D2 that is more recessed from the first recess D1 and has a small The amplitude S2 of the punch head 42 is about the same second amplitude S2. Further, the width of the protrusion W1 on the one side B side is equal to the width S3 of the mold hole 12a. As described above, the relationship of S2 < S3 < S1 (2) is satisfied.

Next, in order to easily understand the effects of the present embodiment, first, a comparative example will be described. Fig. 5 is a view showing a comparison state, wherein Fig. 5(a) shows a state in which the workpiece is placed on the mold portion 12A of the comparative embodiment, and Fig. 5(b) shows a state in which the punch 40A of the comparative embodiment is lowered. A state in which the projection W1 is formed on the workpiece W.

The punch head 40A of the comparative state, as shown, does not have a large punch head but only has a small punch head 42A. Further, even in the comparative embodiment, the distance d2 between the side surface of the small punch head 42A and the inner surface of the die hole 12a is equal to or less than the plate thickness T of the workpiece W.

In the comparative embodiment, the punch head 40A is lowered from the state of Fig. 5(a), and as shown in Fig. 5(b), the punch head 40A (small punch head 42A) presses the workpiece W. When the pressing depth becomes deep, the workpiece W is plastically deformed. Here, since the workpiece W is deformed by the shearing process, the projection has a sharp edge. However, the tensile stress acts on the rising portion of the protruding portion (portion P2 in the drawing) to cause cracking.

However, the punch head 40 of the present embodiment has a two-stage structure of the large punch head 41 and the small punch head 42 as shown in FIG. According to the present embodiment, the workpiece W is originally present in the portion indicated by the symbol B in Fig. 3, and is pressed downward by the large punch head 41 when the projection W1 is formed. Doing so, as indicated by the arrow in Figure 3, causes the material of this Part B to flow to the other parts. That is, the material is pushed to flow and the material is supplied to the portion where the tensile stress acts to relax the tensile stress. Further, by the pressing of the large punch head 41, the pressed portion is forged and the hardness is increased.

Fig. 6 is a graph showing the results of measuring the hardness of the portion of P1 to P4 in Fig. 3 for the workpiece W formed in the present embodiment. The position indicated by the broken line in Fig. 6 is 197 HV of the hardness of the workpiece W itself. According to this embodiment, the portions of any of P1 to P4 are hardened, and the strength of the article can be improved.

Further, in the present embodiment, since the protrusion W1 also has a deformed form due to shearing, the R value of the corner portion of the workpiece W after the molding is steep (it is less likely to cause collapse of the corner portion). Therefore, it is possible to form fine irregularities. Further, the material that has flowed out from the portion B not only increases the hardness but also flows to other portions of the workpiece W. By this flow, it is possible to ensure that the portions P2 and P3 of the rising portion of the projection W1 have a predetermined thickness. Further, this flowed material is pushed between the corner portion C1 between the large punch head portion 41 and the small punch head portion 42 in the workpiece W, and between the concave mold portion 20 and the side surface of the die hole 12a. Since the corner portion C2 is formed, the R value of the corner portion of the workpiece W after molding is more steep (it is less likely to cause collapse of the corner portion). Therefore, it is possible to further form fine irregularities.

Further, according to the present embodiment, since the projection W1 has a sharp edge, the surface area of the portion where the projection W1 is in contact with the die hole 12a becomes large. Therefore, when the protrusion W1 is brought into contact with another member and the workpiece W is rotated, a large rotational moment can be caused. Therefore, it is suitable for the manufacture of the protrusion part, such as a gear seat.

(Second Embodiment) Fig. 7 is a view showing a second embodiment of the present invention, which corresponds to a third diagram showing the first embodiment. Fig. 8 is a partial cross-sectional view showing the molded article W02 after the second embodiment. The present embodiment differs from the first embodiment in that a slope 42a is provided on the bottom surface of the small punch head 42, and the slope 42a is such that the small punch head 42 is formed toward the edge portion of the small punch head 42. The thickness is thinned in the direction of thinning. Further, the molded article W02 of the second embodiment differs from the molded article W01 of the first embodiment in the inclined surface W1a formed on the bottom surface of the second recessed portion D2 by the inclined surface 42a of the small punching head 42. The other parts are the same, so the description is omitted.

According to the present embodiment, when the punching head 40 presses the surface of the workpiece W, since the slope 42a is provided, the material of the portion D of the workpiece W originally present at the position of the slope 42a is easily Flows in the direction of the arrow shown in the figure. Therefore, the material is further promoted to flow toward a portion of P2 between the small punch head 42 which is likely to cause cracking and the inner surface of the die hole 12a. Thereby, compared with the first embodiment, it is possible to form the projection W1 in which cracks (cracks) are less likely to occur.

Further, the flowing material flows to other portions of the workpiece W. This flowed material is pushed into the corner portion C1 between the large punch head portion 41 and the small punch head portion 42 in the workpiece W, and the corner portion between the concave mold portion 20 and the side surface of the die hole 12a. In C2, the R value of the corner portion of the workpiece W (molded article W02) after molding is more steep. Therefore, it is possible to form finer irregularities.

Further, according to the present embodiment, since the projection W1 has a sharp edge, the surface area of the portion where the projection W1 is in contact with the die hole 12a becomes large. Therefore, when the protrusion W1 is brought into contact with another member and the workpiece W is rotated, a large rotational moment can be caused.

(Third Embodiment) In the third embodiment, the projection forming apparatus 1 of the second embodiment shown in Fig. 7 is formed by forming the projection W1 on the workpiece W, and further, by the third drawing. In the projection forming apparatus 1 of the first embodiment shown, the workpiece W is further pressed to make the formed projection W1 steeper. According to the present embodiment, first, when the punching head 40 presses the surface of the workpiece W by the projection forming apparatus 1 shown in Fig. 7, the workpiece W is formed by the inclined surface 42a. The material of the surface flows to the outside of the small punch head 42. Then, by the projection forming apparatus 1 shown in Fig. 3, the material of the seventh drawing is further flowed, and the edge portion can be made steeper.

(Fourth embodiment) Fig. 9 is a view showing a fourth embodiment of the present invention, which corresponds to a third diagram showing the first embodiment. Fig. 10 is a partial cross-sectional view showing the molded article W04 after the fourth embodiment. The punch head 40 of the projection forming apparatus 1 of the present embodiment differs from the first embodiment in that it is along the small punch head 42 at the end of one surface of the small punch head 42 on the workpiece W side. The protrusions 43 are provided on the outer circumference. Further, in the molded article W04 of the fourth embodiment, unlike the molded article W01 of the first embodiment, as shown in FIG. 10, the projection 43 is further formed at the corner of the bottom surface of the second recess D2. A recess W1b is formed. The other parts are the same, so the description is omitted.

According to the present embodiment, since the projections 43 are provided, the pressing load can be reduced at the time of molding as compared with the pressing of the entire bottom surface of the punching head 40.

Further, according to the present embodiment, when the punching head 40 presses the surface of the workpiece W, since the projections 43 are provided, the material of the E portion of the workpiece W originally present at the position of the projections 43 is easy. The ground flows in the direction of the arrow shown in the drawing. Therefore, the material is further promoted to flow toward a portion of P2 between the small punch head 42 which is likely to cause cracking and the inner surface of the die hole 12a. Thereby, compared with the first embodiment, it is possible to form the projection W1 in which cracks (cracks) are less likely to occur. Further, the material that has flowed not only increases the hardness but also flows to other portions of the workpiece W. This flowed material is pushed into the corner portion C1 between the large punch head portion 41 and the small punch head portion 42 in the workpiece W, and the corner portion between the concave mold portion 20 and the side surface of the die hole 12a. Since C2, the R value of the corner portion of the workpiece W after molding is more steep. Therefore, it is possible to form finer irregularities.

Further, according to the present embodiment, since the projection W1 has a sharp edge, the surface area of the portion where the projection W1 is in contact with the die hole 12a becomes large. Therefore, when the protrusion W1 is brought into contact with another member and the workpiece W is rotated, a large rotational moment can be caused.

[Embodiment] Hereinafter, the result of the projection W1 formed on the workpiece W will be described using the apparatus of the above embodiment. On the protrusion forming device 1, a load was applied using a knuckle press which can apply a maximum load of 400 metric tons. The workpiece W is a hot-rolled steel sheet SPFH590, mechanical properties, YS (yield stress) is 522 MPa, TS (tensile strength) is 604 MPa, and EL (elongation) is 26%. The plate thicknesses of the types are 2.9 mm and 2.5 mm, respectively. In the following, the measured values of the projections W1 of the workpiece W formed by the projection forming apparatus 1 of each embodiment are shown in Table 1. In Fig. 3, which parts of the following (1) to (5) are respectively indicated. (1) The height (H) of the protrusion, (2) the residual thickness in the width direction (the distance d2 between the side surface of the small punch head and the inner surface of the die hole), and (3) the residual thickness in the thickness direction ( 4) The residual thickness of the 45∘ direction, and (5) the collapse of the corner.

[Table 1]

As described above, in the first embodiment, the second embodiment, the third embodiment, and the fourth embodiment, the protrusion W1 formed when the thickness of the workpiece W is 2.9 mm or 2.5 mm is (H≧T) as shown in the formula (4), the height H of the (1) protrusion portion is equal to or greater than the sheet thickness T. In the first embodiment, the second embodiment, the third embodiment, and the fourth embodiment, the protrusion W1 formed when the thickness of the workpiece W is 2.9 mm or 2.5 mm is (2) the residual thickness d2 in the width direction, (3) the residual thickness in the thickness direction, and (4) the residual thickness in the 45 ∘ direction, which is within the range of the thickness T of the workpiece W and Ensure the state of the predetermined thickness. Further, in the third embodiment, after the projections W1 are formed by the second embodiment, the projections W1 are further formed by the first embodiment. Therefore, in the third embodiment, the collapse of the corners can be made small. The steeper protrusion W1 is formed. Further, in the fourth embodiment, since the projections 43 are provided at the end portion of one surface of the workpiece W of the small punch head 42, the fourth embodiment can also make the corner portion smaller and steeper. The protrusion W1 is formed.

1‧‧‧Protrusion forming device
10‧‧‧ Fixed Department
11‧‧‧Mold bracket
11a‧‧‧through hole
12, 12A‧‧‧Mold Department
12a‧‧‧Mold hole
12b‧‧‧ Guide hole
13‧‧‧Guiding column
20‧‧‧ concave mold department
21‧‧‧Ejecting components
30‧‧‧Mobile Department
31‧‧‧Pump bracket
31a‧‧‧First through hole
31b‧‧‧second through hole
31c‧‧‧Pushing guide tube
32‧‧‧Back pallet
33‧‧‧2 holes
33a‧‧‧ first hole
33b‧‧‧ second hole
34‧‧‧Bolt components
34a‧‧‧ head
34b‧‧‧Extension
35‧‧‧ coil spring
36‧‧‧Guidance pin
37‧‧‧Pushing plate
37a‧‧‧First opening
37b‧‧ Thread Department
37c‧‧‧second opening
40, 40A‧‧ ‧ head
41‧‧‧Great head
42, 42A‧‧‧ small punch head
42a, W1a‧‧‧ bevel
43‧‧‧Protrusion
50‧‧‧Pushing Department
A‧‧‧ side of the flat
B‧‧‧The side of the protrusion
B, D, E‧‧‧ originally had parts of the processed body
C1, C2‧‧‧ corner
D1, d2‧‧‧ interval
H‧‧‧ Height of the protrusion
P1, P4‧‧‧ parts of the processed body
P2, P3‧‧‧ part of the processed body (standing part)
S1‧‧‧The amplitude of the first recess
S2‧‧‧Amplitude of the second recess
S3‧‧‧ extent of the protrusion
T‧‧‧The thickness of the processed body
W‧‧‧Processed body
W1‧‧‧ protrusion
W2‧‧‧ Flat Department
W1b‧‧‧ recess
W01, W02, W04‧‧‧ molded products

Fig. 1 is a schematic view of a projection forming apparatus. Fig. 1(a) shows a state before processing of a workpiece, and Fig. 1(b) shows a state after processing of a workpiece. Fig. 2(a) is a photograph of the gear holder on which the projection portion W1 facing downward is viewed from below, and Fig. 2(b) is a photograph of the gear holder on which the projection portion W1 facing downward is provided as viewed from above. Fig. 3 is an enlarged view of a portion A of Fig. 1(b). Fig. 4 is a partial cross-sectional view of the molded article W01 after processing. Fig. 5 is a view showing a comparative state, wherein Fig. 5(a) shows a state in which a workpiece is placed on a mold, and Fig. 5(b) shows a state in which a punch is lowered and a projection is formed on a workpiece. status. Fig. 6 is a graph showing the results of measuring the hardness of the portions P1 to P4 in Fig. 3 for the projections formed in the present embodiment. Fig. 7 is a view showing a second embodiment of the present invention, which corresponds to a third diagram showing the first embodiment. Fig. 8 is a partial cross-sectional view showing the molded article W02 after processing. Fig. 9 is a view showing a fourth embodiment of the present invention, which corresponds to a third diagram showing the first embodiment. Fig. 10 is a partial cross-sectional view showing the molded article W04 after the processing.

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Foreign deposit information (please note in the order of country, organization, date, number)

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1‧‧‧Protrusion forming device

10‧‧‧ Fixed Department

11‧‧‧Mold bracket

11a‧‧‧through hole

12‧‧‧Mold Department

12a‧‧‧Mold hole

12b‧‧‧ Guide hole

13‧‧‧Guiding column

20‧‧‧ concave mold department

21‧‧‧Ejecting components

30‧‧‧Mobile Department

31‧‧‧Pump bracket

31a‧‧‧First through hole

31b‧‧‧second through hole

31c‧‧‧Pushing guide tube

32‧‧‧Back pallet

33‧‧‧2 holes

33a‧‧‧ first hole

33b‧‧‧ second hole

34‧‧‧Bolt components

34a‧‧‧ head

34b‧‧‧Extension

35‧‧‧ coil spring

36‧‧‧Guidance pin

37‧‧‧Pushing plate

37a‧‧‧First opening

37b‧‧ Thread Department

37c‧‧‧second opening

40‧‧‧Heading

41‧‧‧Great head

42‧‧‧Small punch head

50‧‧‧Pushing Department

W‧‧‧Processed body

W1‧‧‧ protrusion

Claims (13)

A protrusion forming device comprising: a mold portion provided with a die hole; and a punch head that can advance and retreat in a first direction toward the mold portion side, and has a large punch head and a small punch head The large punching head has a size that cannot be inserted into the die hole, and the small punching head protrudes from the large punching head toward the die portion side and has a size that can be inserted into the die hole; wherein, by the aforementioned punching The head portion is placed on a portion of the workpiece between the mold portion and the punching head, and is pressed against the mold portion side to deform the workpiece to form a projection. The protrusion forming device according to claim 1, wherein an interval d1 between a side surface of the small punch head and a side surface of the large punch head, and an interval between a side surface of the small punch head and an inner surface of the die hole D2 has a relationship of d2 < d1. The projection forming apparatus according to claim 1, wherein the distance d2 between the side surface of the small punch head and the inner surface of the die hole and the thickness T of the workpiece are d2 <T. The projection forming apparatus according to claim 2, wherein a distance d2 between a side surface of the small punch head and an inner surface of the die hole and a thickness T of the workpiece are d2 <T. The protrusion forming device according to any one of the preceding claims, wherein the bottom surface of the small punch head is provided with a sloped surface which is along an edge portion facing the small punch head The direction in which the thickness of the small punch head is thinned is inclined. A method for forming a protrusion, comprising: a placing step of placing a workpiece on a mold portion, wherein the mold portion is provided with a mold hole; and, a stamping step, which has a large punch head and a small punch head The punching head moves in a first direction toward the mold portion side, and a part of the workpiece to be disposed between the mold portion and the punch head is punched toward the mold by the punching head Pushing the side of the workpiece to deform the workpiece to form a protrusion; wherein the large head has a size that cannot be inserted into the hole of the mold, and the small head is from the large head toward the side of the mold portion It is protruding and has a size that can be inserted into the aforementioned mold hole. The method of forming a protrusion according to claim 6, wherein a distance d1 between a side surface of the small punch head and a side surface of the large punch head and an interval between a side surface of the small punch head and an inner surface of the die hole are provided. D2 has a relationship of d2 < d1. The method of forming a projection according to claim 6, wherein a distance d2 between a side surface of the small punch head and an inner surface of the die hole and a thickness T of the workpiece are d2 <T. The method of forming a projection according to claim 7, wherein the distance d2 between the side surface of the small punch head and the inner surface of the die hole and the thickness T of the workpiece have a relationship of d2 < T. The protrusion forming method according to any one of the preceding claims, wherein the stamping step comprises: a first step of forming a protrusion by providing a punched head, the slope setting Inclining in a direction of thinning the thickness of the small punch head toward the bottom surface of the small punch head; and a second step, by the aforementioned small punch The bottom surface of the head is a flat punch to form a protrusion. A molded article comprising: a flat portion having a thickness T; and a protruding portion protruding from one surface side of the flat portion; and a first concave portion formed on the other surface side of the protruding portion of the molded article And having a first width S1; and a second recess formed further from the first recess and having a second amplitude S2; wherein a thickness d2 of the sidewall portion of the second recess and the flat portion The thickness T satisfies the relationship of d2 < T. The molded article according to claim 11, wherein when the height from the one surface side of the flat portion to the top surface of the one side of the protruding portion is H, H ≧ T. The molded article according to claim 11 or claim 12, wherein the amplitude S1 of the first concave portion, the amplitude S2 of the second concave portion, and the amplitude S3 of the protruding portion on the one surface side satisfy S2<S3 <S1 relationship.