DIE STRUCTURE FOR ROLLING COMPOUND SCREW BODY, DIE STRUCTURE FOR ADJUSTING COMPOUND SCREW BODY, COMPOUND SCREW BODY ROLLING METHOD, AND COMPOUND SCREW BODY ADJUSTING METHOD

WIPO Patent Application WO/2015/156036

A1

A compound screw body is rolled using a die member having a rigid surface which is displaced relatively to a screw material (B) while being pressed thereagainst. The die member is provided with a compound screw part forming region in which a plurality of recessed portions which each form an approximately parallelogram shape when viewed in the direction of the normal to a virtual surface obtained by connecting the outermost portions of the surface and each recessed from the virtual surface are arranged in a plurality of rows along the direction of the relative displacement. Further, the die member has a compound screw part adjusting region which is disposed on the upstream side and/or the downstream side from the compound screw part forming region (U) and in which an adjustment valley portion recessed in the virtual surface while extending in a belt shape is formed to be inclined at an angle corresponding to the lead angle of the compound screw part forming region. Consequently, the rolling defect of the cylindrical screw material is reduced when the compound screw body is formed, thereby enabling mass production of high-precision compound screw bodies.

MICHIWAKI HIROSHI (JP)

PCT/JP2015/054490

October 15, 2015

February 18, 2015

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NEJILAW INC (JP)

B21H3/02

JPH04175508A	1992-06-23
JP2013043183A	2013-03-04
JPS5057053A	1975-05-19
JP2006144896A	2006-06-08
US20120328393A1	2012-12-27

SAHARA Masashi et al. (JP)
Sawara Masafumi (JP)

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