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Press molding method

A technology of stamping forming and forming surface, which is applied in the field of stamping forming, can solve the problems of increasing the number of forming processes and increasing costs, and achieve the effect of avoiding cracks and suppressing wrinkles

Active Publication Date: 2016-02-03
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the method described in Patent Document 1, since the number of molding steps increases, the cost increases

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0032] The press forming method according to the first embodiment of the present invention (refer to figure 1 ) is to use Figure 4 as well as Figure 5 The stamping forming die 5 shown in the stamping forming figure 2 as well as image 3 Shown is the L-shape part 1 method. Before describing the press forming method, the L-shaped member 1 and the press forming die 5 will be described. Hereinafter, the L-shaped member 1 will be outlined.

[0033] Such as figure 2 As shown, the L-shaped member 1 has a top plate portion 2 formed in an L-shape formed by a long side and a short side in plan view, a vertical wall portion 3 formed around the top plate portion 2, and a vertical wall portion 3 formed continuously with the vertical wall portion 3. The flange part 4, its section is as follows image 3 Shown in hat-shape. The vertical wall part 3 and the flange part 4 are not formed in both long side end part and the short side end part (short side end part 2a) of the top plate ...

no. 2 approach

[0058] The present invention is similarly applicable to a member having a T-shaped portion as well as a member having an L-shaped portion. As an example of a part having a T-shaped portion, Figure 9 A center pillar reinforcement of an automotive body (hereinafter, simply referred to as "center pillar 23") is shown. Such as Figure 9 As shown, the center column 23 is provided with: a T-shaped portion having two T-shaped parts in plan view, a top plate portion 25, a vertical wall portion 27 formed around the top plate portion 25, and a vertical wall portion 27 formed continuously. Flange portion 29, the cross section of center column 23 is as Figure 10 Roughly hat-shaped as shown. The overall shape of the center pillar 23 is a shape in which two T-shaped longitudinal sides are connected to each other. The vertical wall portion 27 and the flange portion 29 are not formed at both end portions (lateral end portion 25 a , lateral end portion 25 b , lateral end portion 25 c , a...

Embodiment 1

[0062] In order to confirm the effect of the press forming method of the present invention, specific experiments were conducted. In the experiment, under various stamping conditions, as Figure 12 as well as Figure 13 A front pillar reinforcement for an automobile body (hereinafter, simply referred to as "front pillar 40") was press-molded from a member having an L-shaped portion as shown, and each press-formed product was evaluated for wrinkles and cracks.

[0063] Such as Figure 12 As shown, the front pillar 40 has an L-shaped top plate portion 41 formed by a long side and a short side in a plan view, a vertical wall portion 42 formed around the top plate portion 41 , and a protrusion formed continuously with the vertical wall portion 42 . Edge 43, the cross section of front pillar 40 is as Figure 13 Roughly hat-shaped as shown. The vertical wall part 42 and the flange part 43 are not formed in both long side end part and the short side end part (short side end part 4...

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Abstract

This press molding method is characterized by having: a metal plate disposing step for disposing a metal plate (17) in a manner such that the portion (17a) contacting the end of the narrow end (2a) of the metal plate (17) does not impinge on a blank holder (9); a metal plate sandwiching step for sandwiching the disposed metal plate (17); a molding step for molding the metal plate (17) in the sandwiched state by means of drawing; and a pad restraining step after the metal plate sandwiching step for restraining a position including an L-shaped bend (2b) at a site corresponding to the top plate (2) of the metal plate (17) by means of a pad (11) and a punch (6) partway through the molding process. The press molding method is further characterized in that the pad restraining step is started where the punch in the molding step is at a position that is 0-50% of the molding depth from the position of the start of contact to the metal plate (17) to the bottom dead center position, and the blank holder pressure is at least 0.7 MPa and the pad pressure is at least 3 MPa.

Description

technical field [0001] The present invention relates to a press forming method for forming a member having an L-shaped portion in a L-shape in a plan view or a T-shaped portion in a T-shape in a plan view. Background technique [0002] For example, the body frame parts of automobiles, that is, front pillar (pillar) reinforcement (pillar) reinforcement, center pillar reinforcement, etc., which are manufactured from metal plates by press forming (pressforming) have L-shaped parts that are L-shaped when viewed from above or T-shaped. In the case of a member having a T-shaped portion in the shape of a letter, a drawing method is generally used. The deep drawing method is the following method: it is usually carried out by using a die of press forming consisting of a punch, a die, and a blank holder (wrinkle-proof part). Drawing process is performed on the metal sheet by reducing the distance between the punch and the die while pressing the entire periphery of the metal sheet. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/26B21D24/04
CPCB21D22/26B21D24/04
Inventor 盐崎毅岸上靖广
Owner JFE STEEL CORP