COLD DIAMETER REDUCTION PRESS MOLDING METHOD OF METAL PIPE AND METAL PIPE MOLDED BY THAT METHOD

WIPO Patent Application WO/2003/082495

A1

A cold diameter reduction press molding method of a metal pipe comprising a diameter reduction molding process for reducing the outer circumferential length of an original metal pipe having a noncircular transverse section as compared with the original outer circumferential length while press molding the original pipe to have a transverse section different from that of the original pipe; and a cold diameter reduction press molding method characterized by comprising a process for premolding an original metal pipe having a circular transverse section into a pipe having a transverse section different from that of the original pipe by roll molding using a premolding roll or first press molding using a premolding die, and a diameter reduction molding process for reducing the outer circumferential length of a premolded metal pipe as compared with that of the original metal pipe while remolding the premolded metal pipe to have a transverse section different from that of the premolded metal pipe by second press using a molding die.

ISHIKAWA TSUYOSHI (JP)

PCT/JP2003/004269

October 09, 2003

April 03, 2003

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NAKAYAMA CORP (JP)
ISHIKAWA TSUYOSHI (JP)

B21C37/06; B21C3/08; B21C37/15; B21D3/10; B21D41/04; B21D51/18; B21J5/12; (IPC1-7): B21D41/02; B21C37/06; B21C37/15

WO2002024366A1

2002-03-28

JPS5378972A	1978-07-12
JPS5378971A	1978-07-12
JP2002224743A	2002-08-13
JPS49123342U	1974-10-22
JPS466858B1	1971-02-20
JPH09285829A	1997-11-04
JPS4846562A	1973-07-03
JPH07214151A	1995-08-15
JPH07155832A	1995-06-20

Suzuki, Shoji (Shinjuku-ku, Tokyo, JP)

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