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公开(公告)号：EP0199246A2
公开(公告)日：1986-10-29
申请号：EP86105121.7
申请日：1986-04-14
IPC分类号： B21D25/02
CPC分类号： B21D26/045 , B21D25/02
摘要： A novel and improved method of deforming elongated. hollow members so as to maintan uniform cross-sectional profile, uniform section thickness reduction, and minimal springback characteristics which includes superimposing in the forming process an internal fluid pressure support for the hollow member which imposes a circumferential tension thereon, a longitudinal tension which plastically elongates the member, and a transverse bending load which plastically bends the member.
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公开(公告)号：EP0199246A3
公开(公告)日：1987-08-19
申请号：EP86105121
申请日：1986-04-14
IPC分类号： B21D25/02
CPC分类号： B21D26/045 , B21D25/02
摘要： A novel and improved method of deforming elongated. hollow members so as to maintan uniform cross-sectional profile, uniform section thickness reduction, and minimal springback characteristics which includes superimposing in the forming process an internal fluid pressure support for the hollow member which imposes a circumferential tension thereon, a longitudinal tension which plastically elongates the member, and a transverse bending load which plastically bends the member.
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公开(公告)号：EP0199246B1
公开(公告)日：1989-07-12
申请号：EP86105121.7
申请日：1986-04-14
IPC分类号： B21D25/02
CPC分类号： B21D26/045 , B21D25/02
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