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Press forming method

A technology of stamping forming and formed products, which is applied in the field of stamping forming, and can solve problems such as cracks, defects, and wrinkle forming

Active Publication Date: 2021-08-06
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the press forming of high-tensile steel sheets, forming defects such as cracks and / or wrinkles often occur and become a problem.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0078] Since specific press forming experiments were performed on the effects of the press forming method of the present invention, they will be described below.

[0079] Assuming that the experiment is stamping forming such as Figure 14 and Figure 15 As shown, an experiment of a press-formed product 1 having a hat-shaped cross section having a convexly curved portion 11 curved convexly in a height direction and a concavely curved portion 13 curved concavely is shown. In the press-formed product 1 , the curvature radius of curvature (curvature radius) of the convex curved portion 11 and the curvature radius of curvature of the concave curved portion 13 in the Z-axis direction are both R150. In addition, in the angle formed by the top plate side ridge line portion 5 and the forming direction in the vertical wall portion 7 of each of the straight portions 15, 17, 19 provided adjacent to the longitudinal direction of the convexly curved portion 11 and the concavely curved port...

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PUM

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Abstract

A press forming method according to the present invention is a method for forming a press formed product (1) having a top plate section (3), vertical wall sections (7), flange sections (9), and a protruding curved site (11 curved in a protruding manner and a recessed curved site (13) curved in a recessed manner in the height direction. The method includes: a preforming step for forming an intermediate formed product (31) having bead parts (37) formed in a vertical wall-corresponding surface section (33) corresponding to the vertical wall sections (7) on both sides in the longitudinal direction of each of the protruding curved site (11) and the recessed curved site (13); and a main forming step for forming the press formed product (1) by crushing the bead parts (37) of the intermediate formed product (31) and thereby inducing pseudo shearing deformation in the vertical wall-corresponding surface section (33). In the preforming step, the bead parts (37) are slanted such that an end section of each bead part (37) on the protruding curved site (11) side is spaced apart from a baseline (35) corresponding to a top-plate side ridge line section (5) between the top plate section (3) and the vertical wall section (7), and such that an end section of the bead part (37) on the opposite side is closer to the baseline (35).

Description

technical field [0001] The present invention relates to a press forming method, and more particularly to a press forming method for forming a press formed product having a top portion, a side wall portion and a flange portion portion), and is curved convexly and concavely in the height direction along the length direction when viewed from the side. Background technique [0002] Press forming refers to a method of processing a metal material (metallic material) such as a steel sheet (steel sheet) by clamping it with a die (die of press forming) to copy the shape of the die. In particular, many automotive parts are produced by press forming. Recently, the use of high-strength steel sheets (high-tension steel sheets) for automotive body parts has been considered from the viewpoint of weight reduction of automotive bodies. Tendency to become stronger. As a characteristic of steel sheets and other metal materials, elongation tends to be lacking as strength increases. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D24/04B21D22/20B21D22/26
CPCB21D22/26B21D24/04B21D22/22B21D53/88
Inventor 澄川智史
Owner JFE STEEL CORP
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