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1. (WO2017150690) METHOD FOR MANUFACTURING MOLDED MEMBER

Pub. No.:    WO/2017/150690    International Application No.:    PCT/JP2017/008362
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Fri Mar 03 00:59:59 CET 2017
IPC: B21D 22/28
B21D 24/10
Applicants: NISSHIN STEEL CO., LTD.
日新製鋼株式会社
Inventors: NAKAMURA, Naofumi
中村 尚文
YAMAMOTO, Yudai
山本 雄大
Title: METHOD FOR MANUFACTURING MOLDED MEMBER
Abstract:
The purpose of the present invention is to provide a method for manufacturing a molded member, whereby high precision of inside diameter roundness of a cylindrical body part is maintained even when the plate thickness of a raw material metal plate varies, and it is also possible to prevent adhesion, seizing, and the like of the raw material metal plate to a die for finish ironing. In the present invention, a molded member having a cylindrical body part and a flange part formed on an end part of the body part is manufactured by performing multistage drawing of a raw material metal plate. The multi-stage drawing includes: preliminary drawing for forming a preliminary body having a body part element from the raw material metal plate; at least one compressive drawing for forming a body part by drawing the body part element while applying a pressure-adjustable compressive force to the body part element, the compressive drawing being performed after the preliminary drawing; and at least one finish ironing for ensuring dimensional precision, the finish ironing being performed subsequent to the compressive drawing.