Method for manufacturing pressed component, and shape correction die

Abstract

The objective of the present invention is to suppress warping and twisting in a longitudinal direction when manufacturing an elongate curved component by press molding. This method for manufacturing a pressed component includes: a first step (2) of press molding a metal plate (1) using a first die having the shape of a target component; and a second step (3) of press molding a molded product 10 after the first step (2) using a second die. In the second step (3), warping in a longitudinal direction end portion of the component by elastic recovery due to release from the first die is suppressed by implementing control of an opening of a cross section of a vertical wall portion (10B) of a bent portion (10D) in accordance with said warping.

Description

Technical field [0001] The present invention relates to a technique of providing a molded article (stamping member) composed of a component shape (stamping member), which is a cross-sectional hollow type shape, and has a part of the width direction of the top plate portion along the longitudinal direction in plan view. Random of the convex manner. It should be noted that the cross-sectional hollow type of the above components may have a flange portion continuous with the vertical wall, and may have no flange portion. Background technique [0002] In recent years, in order to carry out the lightweight of the body, the collision safety is improved, and the body skeleton components of the automobile are required to exceed the use of ultra high tensile strength. However, the ultra-high tensile strength is lack of ductility, so it is easy to produce cracks. Moreover, due to the high strength, the ultra-high tensile strength is a tendency to be poorly increased by the pleats and reboun...

AI Technical Summary

Problems solved by technology

Molded products of such a shape are prone to warping in the longitudinal direction, such as lifting or sinking of the end of the part in the longitudinal direction, or a cross-section of the part end, not only a change in the cross-section due to springback (elastic recovery). Defects such as torsion of the section relative to the center of the part length

Furthermore, since the shape of the part is elongated in the longitudinal direction, even if there is a small warpage or small dimensional accuracy defect such as torsion near the center in the longitudinal direction, there will be a large warpage at the end of the part in the longitudinal direction. , reverse

Therefore, it tends to be very difficult to ensure the dimensional accuracy of the molded product of the above-mentioned component shape.

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