Title:
DIE STRUCTURE FOR FORM ROLLING OF DOUBLE-THREADED BODY, METHOD FOR FORM ROLLING OF DOUBLE-THREADED BODY, AND THREAD MATERIAL FOR FORM ROLLING OF DOUBLE-THREADED BODY
Document Type and Number:
WIPO Patent Application WO/2015/125836
Kind Code:
A1
Abstract:
In the present invention, die parts having rigid surfaces that are relatively displaced with respect to a thread material whilst crimping the same are used to form roll a double-threaded body. The die parts are provided with: a double-threaded-part forming region 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; and a single-threaded-part forming region that is positioned adjacent to the double-threaded-part forming region in a state that is offset in the axis direction of the thread material, and in which valleys, which are extended in a band-shape along the virtual surface and are recessed from the virtual surface, are inclined at a lead angle with respect to the relative displacement direction. Thus, a double-threaded body having a single-threaded part and a double-threaded part can be efficiently and highly precisely mass produced.
Inventors:
MICHIWAKI HIROSHI (JP)
Application Number:
PCT/JP2015/054488
Publication Date:
August 27, 2015
Filing Date:
February 18, 2015
Export Citation:
Assignee:
NEJILAW INC (JP)
International Classes:
B21H3/02
Foreign References:
| JPS5057053A | 1975-05-19 | |||
| JP2001009638A | 2001-01-16 | |||
| US20120328393A1 | 2012-12-27 | |||
| JPH04175508A | 1992-06-23 | |||
| JP2003311357A | 2003-11-05 | |||
| JPH0742724A | 1995-02-10 | |||
| JP2007253198A | 2007-10-04 | |||
| JPS4891450A | 1973-11-28 | |||
| US6328516B1 | 2001-12-11 |
Attorney, Agent or Firm:
SAHARA Masashi et al. (JP)
Sawara Masafumi (JP)
Sawara Masafumi (JP)
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