Title:
DIE STRUCTURE FOR FORM ROLLING OF DOUBLE-THREADED BODY, METHOD FOR FORM ROLLING OF DOUBLE-THREADED BODY
Document Type and Number:
WIPO Patent Application WO/2015/125834
Kind Code:
A1
Abstract:
In the present invention, die parts having rigid surfaces that are relatively displaced with respect to a thread material (B) whilst crimping the same are used to form roll a double-threaded body (D). The die parts are provided with a double-threaded-part forming region (U) in which a plurality of recesses, which have an approximately parallelogram shape when viewed from the normal direction of a virtual surface obtained by connecting the outermost surfaces of the die parts and are recessed from the virtual surface, are provided in a plurality of rows along the relative displacement direction. The die parts further include a region in which the array pitch of the recesses within the double-threaded-part forming region (U) in the relative displacement direction decreases from a side that is upstream during relative displacement to the thread material to a side that is downstream during the same. Thus, when a double-threaded body is formed, rolling defects related to cylindrical thread materials are reduced, and the mass production of highly precise double-threaded bodies is possible.
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Inventors:
MICHIWAKI HIROSHI (JP)
Application Number:
PCT/JP2015/054486
Publication Date:
August 27, 2015
Filing Date:
February 18, 2015
Export Citation:
Assignee:
NEJILAW INC (JP)
International Classes:
B21H3/06; B21H3/02; B21H3/04; F16B35/00
Foreign References:
| JPS5057053A | 1975-05-19 | |||
| US20120328393A1 | 2012-12-27 | |||
| JPH04175508A | 1992-06-23 | |||
| JP2001009638A | 2001-01-16 | |||
| JPS4891450A | 1973-11-28 | |||
| US6328516B1 | 2001-12-11 | |||
| JP2003311357A | 2003-11-05 | |||
| JPH0742724A | 1995-02-10 | |||
| JP2007253198A | 2007-10-04 | |||
| JP2006144896A | 2006-06-08 | |||
| JPS4838066B1 | 1973-11-15 | |||
| US20120309548A1 | 2012-12-06 |
Attorney, Agent or Firm:
SAHARA Masashi et al. (JP)
Sawara Masafumi (JP)
Sawara Masafumi (JP)
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