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1. (WO2018139443) MANUFACTURING METHOD FOR TUBULAR MEMBER

Pub. No.:    WO/2018/139443    International Application No.:    PCT/JP2018/001955
Publication Date: Fri Aug 03 01:59:59 CEST 2018 International Filing Date: Wed Jan 24 00:59:59 CET 2018
IPC: B21D 51/10
B21D 53/84
Applicants: FUTABA INDUSTRIAL CO., LTD.
フタバ産業株式会社
Inventors: MANABE, Takahiro
真鍋 剛大
Title: MANUFACTURING METHOD FOR TUBULAR MEMBER
Abstract:
In this manufacturing method for a tubular member, by pressing side surfaces of a tubular member from outside, the shape of a cross-section that is perpendicular to a direction in which the tubular member extends is molded into an oblong shape that extends in a predetermined direction. An interior mold, said interior mold coming into contact with an inner surface of the tubular member that is being pressed such that the cross-section becomes the oblong shape, is inserted into an interior of the tubular member, and the interior mold is slid from one end of the tubular member to the other end. At such time, when the interior mold is viewed in the sliding direction, one or a plurality of contact regions where the inner surface of the tubular member and the interior mold come into contact are in a condition of having spread to the entire area of the inner surface.