公开(公告)号：EP3412375A1

公开(公告)日：2018-12-12

申请号：EP16889424.4

申请日：2016-12-15

申请人： Nippon Steel & Sumitomo Metal Corporation

发明人： YOSHIDA, Hiroshi ,  MIZUMURA, Masaaki ,  MORI, Yasunori ,  KUBOTA, Hiroaki

IPC分类号： B21J5/08 ,  B21J5/02 ,  B21K1/10 ,  F16C3/02

CPC分类号： B21J5/02 ,  B21J5/025 ,  B21J5/08 ,  B21K1/063 ,  B21K1/10 ,  F16C3/02

摘要： A method for manufacturing a tubular member has: a step of disposing a steel pipe which is a material in an outer die having an inner surface having the same shape as an outer form of the tubular member with at least a part of the steel pipe being separated from the inner surface; and a step of compressing the steel pipe in the axial direction by decreasing a relative distance between a pair of pressurizing dies that respectively abut both end surfaces of the steel pipe in the axial direction in a state where a core die portion having an outer surface shape that is the same as inner surface shapes of the both end portions of the tubular member in the axial direction is inserted between the pair of pressurizing dies with at least a part of the core die portion being separated from the inner surface of the steel pipe.