METHOD AND APPARATUS FOR FORMING RECESS OF HOLLOW PIPE

WIPO Patent Application WO/2005/035159

A1

A roll support block (10) has roll-forming rolls (6-9) arranged in four stages, and the roll support block (10) moves while being guided by a guide hole (13) of a pipe holder (5). The rolls (6-9) sequentially come, through a forming window (35) formed in the pipe holder (5), in press-contact with a hollow pipe (2) fixed by the pipe holder (5). First, while rolling, a first-stage roll (6) comes in press-contact with the hollow pipe (2), preliminarily forming a recess. Then, second- and third-stage rolls (7, 8), whose diameters are larger in that order, perform preliminary forming to enlarge the recess. Finally, a fourth roll (9) forms a final shape of a first or a second lock groove (3, 4).

JP5795733	Roll forming method for forming a longitudinal tooth profile on a pot-shaped cylindrical workpiece
JP2948515	HEAT TRANSFER TUBE WITH INTERNAL GROOVE AND MANUFACTURE THEREOF
JPS58116936	WORKING METHOD FOR INTERNAL GROOVE OF HEAT EXCHANGING PIPE

NAGASONO YUTAKA (JP)
SATO HIROSHI (JP)
NAGASONO HIDEAKI (JP)

PCT/JP2004/015542

April 21, 2005

October 14, 2004

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EISHIN INC (JP)
NAGASONO YUTAKA (JP)
SATO HIROSHI (JP)
NAGASONO HIDEAKI (JP)

B21D17/04; (IPC1-7): B21D17/04

JP2003305519A	2003-10-28
JP2004291085A	2004-10-21
JP2003071522A	2003-03-11
JP2002210519A	2002-07-30

Kozu, Takako c/o Kubota (Hirai & Kozu 41-2-111, Senju Akebonoch, Adachi-ku Tokyo, JP)

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