JP2017121658A - NEGATIVE ANGLE FLANGE MEMBER, ITS MANUFACTURING METHOD, AND STRUCTURE PROVIDED WITH NEGATIVE ANGLE FLANGE MEMBER - Google Patents

Abstract

Disclosed is a negative angle flange member that changes shape in the longitudinal direction (curves in the longitudinal direction and changes in cross-sectional shape) with a difficult-to-process plate material (TS440 MPa or more) having a negative angle flange.
A first flange, a first vertical wall that is continuous with the first flange, a top plate that is continuous with the first vertical wall, a second vertical wall that is continuous with the top plate, It has a cross-sectional shape having a second flange 7 continuous with the second vertical wall 6, has a curved portion 8 in the longitudinal direction, or changes in the cross-sectional shape in the longitudinal direction, and has a tensile strength of 440 MPa or more. This is a press-formed body 1 made of steel. The first flange 3 is an inward flange toward the inside of the cross section, and the second flange 7 is an outward flange toward the outside of the cross section.
[Selection] Figure 1

Description

  The present invention relates to a negative angle flange member, a manufacturing method thereof, and a structure including the negative angle flange member.

  As a part of reducing the weight of automobiles, a collision-resistant member includes a member made of a difficult-to-process material with a tensile strength of 440 MPa or more having a joining flange in the cross section (for example, two outward flanges for joining in the cross section). Application of a hat cross-section member is being promoted.

  On the other hand, from the viewpoint of further weight reduction and member arrangement in a limited space, high-strength steel pipes are used for various types of collision-resistant members such as A-pillar upper reinforcement and door impact beams. In the case of a hat cross-section member, it is difficult to reduce the design cross-section because there are two outward flanges.

  For this reason, application of a high-strength steel pipe may be preferred for the member arrange | positioned at a narrow part like A pillar upper reinforcement, for example. In addition, since the hat cross-section member has two flanges facing outward, the collision characteristics and rigidity may not be optimized. That is, the two flanges of the hat cross-section member being restricted outwardly may hinder effective utilization of the design space and optimization of collision characteristics and rigidity.

  Patent Document 1 discloses an invention for manufacturing an automotive part having a complicated shape such as a metal bumper reinforcement at a low cost in one step by devising the structure and operation order of a press die. Yes.

  Patent Document 2 discloses an invention in which a desired closed cross-sectional shape is formed by roll forming.

  Furthermore, Patent Document 3 discloses a metal plate press-molding method capable of manufacturing a closed cross-section member from a metal plate using a normal press-molding facility.

JP 2003-053446 A Japanese Patent No. 4581001 JP 2009-285696 A

  The present inventors, for example, set one of the two outward flanges of the hat cross-section member to an inward flange that is bent toward the same side as the outward flange on the inner side of the cross section (in this specification, this If the flange can be referred to as a “negative angle flange” and this member can be referred to as a “negative angle flange member”, the negative angle flange member can be disposed in a narrow part such as an A-pillar upper reinforcement or a side member. It has been conceived that it is effective for the collision member and the collision member that is important to control the bending mode, and it is possible to reduce the weight as compared with a normal outward hat cross-section member.

  In Patent Document 1, although “complex shape” is described, wrinkles are generated particularly when the thickness of the blank or the bending curvature in the longitudinal direction of the product is large, and the desired shape is obtained. There is a great restriction that it cannot be processed. For this reason, in the invention disclosed in Patent Document 1, a relatively flat bumper reinforcement can be manufactured, but a negative angle flange member cannot be manufactured.

  Since the invention disclosed in Patent Document 2 performs processing by roll forming, a member whose cross-sectional shape greatly changes in the longitudinal direction cannot be formed, and a negative-angle flange member cannot be manufactured.

  Furthermore, since the invention disclosed by Patent Document 3 is a press working method based on bending, for example, a negative-angle flange member having a high degree of freedom in shape having a curved portion in the longitudinal direction targeted by the present invention. Can not be manufactured.

  The present invention has been made in view of the above-mentioned problems of the conventional technology. In a broad sense, the present invention aims to provide a press working technology for manufacturing automotive parts from a thin plate. Changes in the longitudinal direction of difficult-to-process plates with tensile strength of 440 MPa or more, such as door impact beams, A-pillar upper panels, and member members that have square flanges (curve in the longitudinal direction or change in cross-sectional shape) It is an object of the present invention to provide a negative angle flange member, a manufacturing method thereof (a method of manufacturing a negative angle flange member from a thin steel plate by pressing), and a structure including the negative angle flange member.

As a result of intensive studies to solve the above-mentioned problems, the present inventors have obtained knowledge A and B listed below, and have further studied to complete the present invention.
(A) Even if an attempt is made to form a negative angle flange member by a normal pressing method using a punch and a die, a negative angle flange will be formed in the pressing direction, so that it cannot be formed by the conventional pressing method. .
(B) The press process of the negative angle flange member is multi-processed, the press forming method (various bending and drawing) suitable for each part is used, and the press work is performed in the optimal order. A negative flange member having a tensile strength of 440 MPa or more can be manufactured by dividing the machining process in the width direction of the long blank and changing the structure of the mold used to control the strain increase of the blank during press working. .

  The present invention is listed below.

(1) a first flange (negative angle flange), a first vertical wall continuous with the first flange, a top plate continuous with the first vertical wall, and a second vertical wall continuous with the top plate, Steel having a cross-sectional shape having a second flange continuous with the second vertical wall and having a curved portion in the longitudinal direction, or the transverse cross-sectional shape changing in the longitudinal direction, and having a tensile strength of 440 MPa or more In the press-formed body made of
The first flange is an inward flange facing inward of the cross section, and the second flange is an outward flange facing outward in the cross section.

(2) A structure including the first negative angle flange member described in item 1 and another member,
The structure in which the first negative angle flange member has a closed cross-sectional shape while the first flange and the second flange are joint portions with the other members.

(3) The other member is a second negative angle flange member,
The first flange of the first negative angle flange member is a lap joint with the first flange of the second negative angle flange member,
The structure according to item 2, wherein the first flange of the first negative angle flange member is an overlapping joint portion with the first flange of the second negative angle flange member.

(4) The manufacturing method of the negative angle flange member described in item 1, which includes the following first to third steps;
First step: By performing pad drawing using a first punch, a first die, a first pad and a first blank holder on a long blank having a tensile strength of 440 MPa or more, the width of the long blank is increased. A long first intermediate molded article having a first surface having a curved portion in the longitudinal direction or a cross-sectional shape changing in the longitudinal direction and a second surface connected to the first surface at one edge portion Manufacturing,
Second step: The second die is rotated while the pressing direction is turned 90 degrees from the pressing direction in the first step and a part of the first surface of the first intermediate molded product is pressed with a second punch and a second pad. And producing a long second intermediate molded product having the first flange, the first vertical wall, and a second surface continuous to the first vertical wall by performing pad drawing using a second blank holder. To
Third step: The pressing direction is turned 90 degrees from the pressing direction in the second step to be the same direction as the first step, and a part of the second surface of the second intermediate molded product in the width direction is third. By performing pad bending using a third die while pressing with a punch and a third pad, or performing pad drawing using a third die and a third blank holder while holding the part with a third punch and a third pad A top plate continuous to the first vertical wall, a second vertical wall continuous to the top plate, and a second flange continuous to the second vertical wall are formed.

  According to the present invention, a negative-angle flange member having a good cross-sectional efficiency, which is a difficult-to-process material and has been reduced in size to have a negative-angle flange (inward flange) from a long blank (thin plate) having a tensile strength of 440 MPa or more. Is provided.

FIG. 1A is a perspective view showing an example of a negative angle flange member according to the present invention, and FIG. 1B is a perspective view showing an example of a structure using the negative angle flange member shown in FIG. It is. FIG. 2 is an explanatory view showing a situation in which pad drawing is performed in the first step, FIG. 2 (a) is a front view showing a press die used in the first step, and FIG. It is a front view of the 1st intermediate molded product manufactured by 1 process, and Drawing 2 (c)-Drawing 2 (f) looked at the 1st intermediate molded product manufactured by the 1st process from various directions, etc. FIG. FIG. 3 is an explanatory view showing a situation in which pad drawing is performed in the second step. FIG. 3 (a) is a front view showing a press die used in the second step, and FIG. FIG. 3 (c) to FIG. 3 (f) are front views of a second intermediate molded product manufactured in two steps, and the second intermediate molded product manufactured in the second step is viewed from various directions. FIG. FIG. 4 is an explanatory view showing a situation where pad bending is performed in the third step, and FIG. 4 (a) is an isometric view showing a press die used in the third step, and FIG. 4 (b). FIG.4 (g) is the isometric view which looked at the negative angle flange member (A pillar upper panel) manufactured at the 3rd process from various directions. FIG. 5 is an explanatory view showing shapes and plate thickness reduction rates of the first and second intermediate molded products and the negative angle flange member (A pillar upper panel) in the first to third steps. FIG. 6 is an explanatory view showing a situation in which a negative angle flange member (member member) is manufactured according to the present invention, FIG. 6 (a) shows a mold used in the first step, and FIG. 6 (b) shows a second state. The metal mold | die used at a process is shown, FIG.6 (c) shows the metal mold | die used at a 3rd process. FIGS. 7A to 7C are isometric views of the negative angle flange member (member member) manufactured by the first to third steps as seen from various directions. FIG. 8 shows the molding conditions in the first to third steps, the plate thickness reduction rate (%) of each part of the manufactured negative angle flange member (member member), and the Y-direction movement amount (mm) of the material being molded. It is explanatory drawing shown collectively.

  The present invention will be described with reference to the accompanying drawings.

1. Negative angle flange member 1 according to the present invention
Fig.1 (a) is a perspective view which shows an example of the negative angle flange member 1 which concerns on this invention, FIG.1 (b) is an example of the structure 2 using the negative angle flange member 1 shown to Fig.1 (a). It is a perspective view shown.

  The negative angle flange member 1 is a steel press-formed body having a tensile strength of 440 MPa or more.

  As shown in FIG. 1A, the negative angle flange member 1 includes a first flange 3 (negative angle flange), a first vertical wall 4, a top plate 5, a second vertical wall 6, and a second flange. 7 having a cross-sectional shape.

  The first vertical wall 4 is continuous with the first flange 3. The top plate 5 is continuous with the first vertical wall 4. The second vertical wall 6 is continuous with the top plate 5. Further, the second flange 7 is continuous with the second vertical wall 6.

  The negative angle flange member 1 has a curved portion 8 in the longitudinal direction, or its cross-sectional shape changes in the longitudinal direction.

  As a case where the curved portion 8 is provided, (a) when curved in a plane substantially parallel to the top plate 5, (b) a direction intersecting the top plate 5 (that is, the first vertical wall 4 and the second vertical wall 6 It may be curved in the height direction). As the case where the cross-sectional shape changes, for example, the width of the top plate 5, the height of the first and second vertical walls 4 and 6, the width of the first and second flanges 3 and 7 may change.

  As shown in FIG. 1A, the first flange 3 is an inward flange facing the inside of the cross section of the negative angle flange member 1, and the second flange 7 is an outside of the cross section of the negative angle flange member 1. It is an outward flange facing toward. That is, both the first flange 3 and the second flange 7 are formed in substantially the same direction in the cross section.

  For this reason, the negative angle flange member 1 has a small cross section because it has a negative angle flange (inward flange) from a long blank (thin plate) having a tensile strength of 440 MPa or more, which is a difficult-to-process material, Excellent cross-sectional efficiency.

  Therefore, if the negative angle flange member 1 is applied to, for example, an A pillar upper panel, the driver's blind spot can be reduced and the driver's visibility can be improved. Moreover, if the negative angle flange member 1 is applied to the side member, it is possible to reduce the interference of mounted parts and increase the degree of freedom in designing the vehicle. Can be improved.

2. Structure 2 according to the present invention
As shown in FIG.1 (b), the structure 2 which concerns on this invention is a structure provided with the 1st negative angle flange member 1 which concerns on this invention mentioned above.

  The structure 2 has a closed cross-sectional shape by being joined to another member 9 using the first flange 3 and the second flange 7 of the first negative angle flange member 1 as joints. The structure 2 shown in FIG. 1B is a case where the other member 9 is the second negative angle flange member according to the present invention. That is, the second negative angle flange member 9 is similar to the first negative angle flange member 1 in that the first flange 10 (negative angle flange), the first vertical wall 11, the top plate 12, and the second vertical A cross-sectional shape having a wall 13 and a second flange 14 is provided. The first vertical wall 11 is continuous with the first flange 10. The top plate 12 continues to the first vertical wall 11. The second vertical wall 13 is continuous with the top plate 12. Further, the second flange 14 is continuous with the second vertical wall 13. Furthermore, the second negative angle flange member 9 has a curved portion 15 in the longitudinal direction, or its cross-sectional shape changes in the longitudinal direction.

  The first flange 3 of the first negative angle flange member 1 is overlapped and joined with the first flange 10 of the second negative angle flange member 9, and the second flange 7 of the first negative angle flange member 1. Are overlapped and joined to the second flange 14 of the second negative angle flange member 9.

  However, the structure 2 according to the present invention is not limited to the case where the other member is the second negative angle flange member 9 according to the present invention, and the other member may be, for example, a flat closing plate. .

3. Manufacturing Method of Negative Angle Flange Member 1 According to the Present Invention The negative angle flange member 1 according to the present invention may be manufactured by any means, but is manufactured through the following first to third steps, thereby producing a manufacturing cost. Can be manufactured at low cost. In the following description, a case where the negative angle flange member 1 is applied to (1) an A pillar upper panel and (2) a member member is taken as an example.

  (1) A pillar upper panel

(1-1) First Step FIG. 2 is an explanatory view showing a situation in which pad drawing is performed in the first step, and FIG. 2 (a) is a front view showing a press die 20 used in the first step. 2B is a front view of the first intermediate molded product 27 manufactured in the first step, and FIGS. 2C to 2F are the first intermediate manufactured in the first step. It is the isometric view which looked at the molded article 27 from various directions.

  A pad using the first blank holder 21, the first die 22, the first punch 23, and the first pad 24 on a long blank B having a tensile strength of 440 MPa or more (for example, 980 MPa) and a plate thickness of 1.4 mm, for example. Perform drawing. In the pad drawing, a +0.1 mm distance block may be used for the first blank holder 21.

  By this pad drawing, the first blank portion 8 has a curved portion 8 (outside convex shape portion) in the longitudinal direction at one edge portion in the width direction or the sectional shape in the longitudinal direction changes. A long first intermediate molded product 27 including the surface 25 and the second surface 26 connected to the first surface 25 is manufactured.

(1-2) Second Step FIG. 3 is an explanatory view showing a situation in which pad drawing is performed in the second step, and FIG. 3 (a) is a front view showing a press die 30 used in the second step. 3B is a front view of the second intermediate molded product 35 manufactured in the second step, and FIGS. 3C to 3F are the second intermediate manufactured in the second step. It is the isometric view which looked at the molded article 35 from various directions.

  In the second step, the pressing direction is turned 90 degrees from the pressing direction in the first step, and a part of the first surface 25 of the first intermediate molded product 27 is pressed by the second punch 31 and the second pad 33 while the second step. Pad drawing using the two dies 32 and the second blank holder 34 is performed. By this pad drawing, a long second intermediate molded product 35 including the first flange 3, the first vertical wall 4, and the second surface 26 continuous with the first vertical wall 4 is manufactured.

(1-3) Third Step FIG. 4 is an explanatory view showing a situation where pad bending is performed in the third step, and FIG. 4 (a) is an isometric projection showing a press die 40 used in the third step. 4 (b) to 4 (g) are isometric views of the negative angle flange member (A pillar upper panel) 1 manufactured in the third step as seen from various directions.

  The pressing direction is turned 90 degrees from the pressing direction in the second step to be the same direction as the first step, and a part of the second surface 26 of the second intermediate molded product 35 in the width direction is set to the third punch 41 and the third step. Pad bending using the third die 42 while pressing with the pad 43, or pad bending using the third die 42 while pressing the part with the third punch 41 and the third pad 43 is performed.

  In the case where wrinkles and excess meat are concerned about the second intermediate molded product 35 at the time of molding, pad drawing is performed in order to suppress the inflow of material.

  Thereby, the 1st flange 3, the 1st vertical wall 4, the top plate 5, the 2nd vertical wall 6, and the 2nd flange 7 are formed. Thus, the negative angle flange member (A pillar upper panel) 1 according to the present invention is manufactured by press molding.

  FIG. 5 is an explanatory view showing the shapes and plate thickness reduction rates of the first and second intermediate molded products 27 and 35 and the negative flange member (A pillar upper panel) 1 in the first to third steps described above. The number in the middle indicates the sheet thickness reduction rate (%) at the indicated position.

  As shown in the figure, the negative angle flange member (A pillar upper panel) 1 has a curved portion 8 in a plane substantially parallel to the top plate 5 in the longitudinal direction and in a plane crossing the top plate 5. I understand. The thickness reduction rate of the first intermediate molded product 27 is 6.0 to -2.6%, and the thickness reduction rate of the second intermediate molded product 35 is 8.2 to -4.1%. The plate thickness reduction rate of the negative angle flange member (A pillar upper panel) 1 is 8.5 to -3.9%. From this plate thickness reduction rate, it can be seen that the negative angle flange member (A pillar upper panel) 1 can be manufactured without causing cracks or wrinkles in the first to third steps of the present invention.

  (2) Member member

(2-1) 1st process FIG. 6: is explanatory drawing which shows the condition which manufactures the negative angle flange member (member member) 1 by this invention, FIG. 6 (a) shows the metal mold | die 50 used at a 1st process. 6B shows a mold 60 used in the second step, and FIG. 6C shows a mold 70 used in the third step.

  FIGS. 7A to 7C are isometric views of the negative angle flange member (member member) 1 manufactured by the first to third steps as seen from various directions. A bead 5 a is formed on the top plate 5 of the negative angle flange member 1.

  Further, FIG. 8 shows the molding conditions in the first to third steps, the plate thickness reduction rate (%) of each part of the manufactured negative angle flange member (member member) 1 and the amount of movement of the material during molding in the Y direction ( It is explanatory drawing which shows mm) collectively.

  As shown in FIG. 6A, the first punch 51, the first die 52, and the first pad are formed on a long blank B having a tensile strength of 440 MPa or more (eg, 980 MPa) and a plate thickness of, eg, 1.4 mm. The pad drawing using 53 and the first blank holder 54 is performed. In this pad drawing, a +0.1 mm distance block may be disposed between the first blank holder 54 and the first die 52.

  As shown in FIG. 8, in the first step (first step), for example, the first pad 53 (upper pad) pressure may be set to 50 tons, and the first blank holder 54 pressure may be set to 20 tons.

  By this pad drawing, the first surface has a curved portion in the longitudinal direction (an outer convex portion) at one edge in the width direction of the long blank B, or the sectional shape in the longitudinal direction changes. 25 and a long first intermediate molded product 27 having a second surface 26 connected to the first surface 25 are manufactured.

(2-2) Second Step As shown in FIG. 6B, in the second step, the first surface 25 of the first intermediate molded product 27 is rotated 90 degrees from the pressing direction in the first step. The second die 62 and the second blank holder 64 are used to perform pad drawing while pressing a part of the second surface 26 and the second surface 26 with the second punch 61 and the second pad 63.

  In this pad drawing, a +0.1 mm distance block may be disposed between the second blank holder 64 and the second die 62. For example, the second pad 63 (upper pad) pressure may be 50 tonf, The two blank holder 64 pressures may be set to 20 tonf.

  By this pad drawing, a long second intermediate molded product 35 including the first flange 3, the first vertical wall 4, and the first surface 25 continuous with the first vertical wall 4 is manufactured.

(2-3) Third Step As shown in FIG. 6C, in the third step, the press direction is turned 90 degrees from the press direction in the second step to be the same direction as the first step. Pad bending using the third die 72 by pressing a part of the first surface 25 of the intermediate molded product 35 in the width direction with the third punch 71 and the third pad 73, or the part with the third punch 71 and the third pad 73. The pad drawing or pad bending using the third die 72 and the third blank holder (not shown) is performed while being pressed by the three pads 73. FIG. 6C shows the case of pad bending.

  Pad wrinkle molding is performed when wrinkles or surpluses are generated in the second intermediate molded product 35 during molding.

  Thereby, the 1st flange 3, the 1st vertical wall 4, the top plate 5, the 2nd vertical wall 6, and the 2nd flange 7 are formed. In this way, the negative angle flange member (member member) 1 according to the present invention having the outer shape shown in FIGS. 7A to 7C is manufactured by press molding.

  As shown in FIGS. 7A to 7C, the negative angle flange member (member member) 1 is in a plane substantially parallel to the top plate 5 in the longitudinal direction and in a plane crossing the top plate 5. It can be seen that it has a curved portion 8.

  Further, as shown in FIG. 8, the plate thickness reduction rate of the negative angle flange member (member member) 1 is 13.8 to -10.6%. It can be seen that the negative-angle flange member (member member) 1 can be manufactured without causing cracks or wrinkles in the process.

DESCRIPTION OF SYMBOLS 1 Negative angle flange member 2 which concerns on this invention Structure 3 which concerns on this invention 1st flange 4 1st vertical wall 5 Top plate 6 2nd vertical wall 7 2nd flange 8 Curved part

Claims (4)

A first flange, a first vertical wall continuous with the first flange, a top plate continuous with the first vertical wall, a second vertical wall continuous with the top plate, and continuous with the second vertical wall In a steel press-formed body having a transverse cross-sectional shape having a second flange, having a curved portion in the longitudinal direction, or changing the transverse cross-sectional shape in the longitudinal direction and having a tensile strength of 440 MPa or more,
The first flange is an inward flange facing inward of the cross section, and the second flange is an outward flange facing outward in the cross section. A structure comprising the first negative flange member described in claim 1 and another member,
The structure in which the first negative angle flange member has a closed cross-sectional shape while the first flange and the second flange are joint portions with the other members. The other member is a second negative angle flange member,
The first flange of the first negative angle flange member is a lap joint with the first flange of the second negative angle flange member,
The structure according to claim 2, wherein the first flange of the first negative angle flange member is a lap joint with the first flange of the second negative angle flange member. It has the following 1st-3rd processes, The manufacturing method of the negative angle flange member described in Claim 1 characterized by the above-mentioned;
First step: By performing pad drawing using a first punch, a first die, a first pad and a first blank holder on a long blank having a tensile strength of 440 MPa or more, the width of the long blank is increased. A long first intermediate molded article having a first surface having a curved portion in the longitudinal direction or a cross-sectional shape changing in the longitudinal direction and a second surface connected to the first surface at one edge portion Manufacturing,
Second step: The second die is rotated while the pressing direction is turned 90 degrees from the pressing direction in the first step and a part of the first surface of the first intermediate molded product is pressed with a second punch and a second pad. And by performing pad drawing using a second blank holder, a long second intermediate molded product having a first flange, the first vertical wall, and a second surface continuous to the first vertical wall is manufactured. ,
Third step: The pressing direction is turned 90 degrees from the pressing direction in the second step to be the same direction as the first step, and a part of the second surface of the second intermediate molded product in the width direction is third. By performing pad bending using a third die while pressing with a punch and a third pad, or performing pad drawing using a third die and a third blank holder while holding the part with a third punch and a third pad A top plate continuous to the first vertical wall, a second vertical wall continuous to the top plate, and a second flange continuous to the second vertical wall are formed.

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