B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
B21D 41/02 (2006.01) B21C 37/16 (2006.01)
Patent
CA 2357724
At first, an open end of an original metal pipe M is plastically deformed to such the coaxially expanded state M1 that axial wall length L2 at a side to be eccentrically expanded is longer than axial wall length L1 at the opposite side to be expanded without eccentricity. The coaxially expanded open end M1 is then plastically deformed to an eccentrically expanded state M2 by forcibly inserting an eccentrically expanding punch 20 into the coaxially expanded open end M1. The eccentrically expanding punch 20 has a boundary 23 between a conical tip 21 and a cylindrical body 22 inclined with a predetermined angle .theta. so as to bring the cylindrical body 22 into contact with an inner wall of the coaxially expanded open end M1 at a side to be eccentrically expanded earlier than the opposite side to be expanded without eccentricity. When the coaxially expanded open end M1 is plastically deformed to an eccentrically expanded state M2, metal flow is suppressed at a side to be eccentrically expanded, but metal flow from the opposite side to be expanded without eccentricity to the former side is promoted. Consequently, the open end is plastically deformed to the eccentrically expanded state M2 without thickness deviation along a circumferential direction.
Ishikawa Hanji
Otsuka Masato
Nisshin Steel Co. Ltd.
Ridout & Maybee Llp
LandOfFree
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