SPIRAL PIPE EXTRUSION METHOD AND SPIRAL PIPE EXTRUSION MACHINE

WIPO Patent Application WO/2013/145815

A1

The present invention addresses the problem of extruding a spiral pipe while preventing the rotation of the front end of the spiral pipe during the extrusion, the spiral pipe having spiral grooves. A spiral pipe extrusion machine (2) is provided with: a mandrel (23) having a male bearing (231) at the front end thereof in the extrusion direction of a pipe material, the male bearing (231) forming the inner peripheral surface of the pipe material; and a die (24) having a female bearing (241) for forming the outer peripheral surface of the pipe material and surrounding, on the outside of the male bearing (231), the whole or a part of the male bearing (231) in the longitudinal direction. The spiral pipe extrusion machine (2) is also provided with forming ridges (25) disposed on the male bearing (231) and/or the female bearing. When using the spiral pipe extrusion machine (2), the mandrel (23) and the die (24) are forcibly rotated in the opposite directions to extrude the pipe material along a straight line, continuously forming spiral grooves (11) in either the inner peripheral surface and/or the outer peripheral surface of the pipe material, the spiral grooves (11) helically extending in the longitudinal direction. Torque applied to the pipe material is offset by forcibly rotating the mandrel (23) and the die (24) in the opposite directions, and thus the rotation of the front end during the extrusion is prevented.

KOURABA MITSURU (JP)

PCT/JP2013/050930

October 03, 2013

January 18, 2013

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LIXIL CORP (JP)

B21C23/10; B21C25/02; B21C25/04; B21D11/06

JPH09295040A	1997-11-18
JPH10258308A	1998-09-29
JP2009172657A	2009-08-06
JP2006247734A	2006-09-21

YAMAMOTO, Noriaki et al. (JP)
Yamamoto 典輝 (JP)

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