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Patent Searching and Data


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 (3-10-25 Sumiyoshi-cho, Nishitokyo-sh, Tokyo 05, 〒2020005, JP)
Application Number:
JP2015/054486
Publication Date:
August 27, 2015
Filing Date:
February 18, 2015
Export Citation:
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Assignee:
NEJILAW INC. (2-4-10, Aomi Koto-k, Tokyo 64, 〒1350064, JP)
International Classes:
B21H3/06; B21H3/02; B21H3/04; F16B35/00
Foreign References:
JPS5057053A1975-05-19
US20120328393A12012-12-27
JPH04175508A1992-06-23
JP2001009638A2001-01-16
JPS4891450A1973-11-28
US6328516B12001-12-11
JP2003311357A2003-11-05
JPH0742724A1995-02-10
JP2007253198A2007-10-04
JP2006144896A2006-06-08
JPS4838066B11973-11-15
US20120309548A12012-12-06
Attorney, Agent or Firm:
SAHARA Masashi et al. (SIGHT PATENT, 5th Floor Omiyamiki Bldg., 9-18, Sakuragicho 1-chome, Omiya-ku, Saitama-sh, Saitama 54, 〒3300854, JP)
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