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Title:
DIE STRUCTURE FOR HEADING COMPOUND SCREW, AND HEADING METHOD FOR COMPOUND SCREW
Document Type and Number:
WIPO Patent Application WO/2015/146383
Kind Code:
A1
Abstract:
According to the present invention, a cylindrical inner peripheral surface is formed using a die member wherein the surfaces of a plurality of die pieces are combined, and the cylindrical inner peripheral surface is pressed onto a screw material and the screw material is headed. The die member is provided with a compound-screw-part forming region. The compound-screw-part forming region has arrayed thereon in the axial direction a plurality of recessed parts that form an approximately parallelogram shape when seen in the normal direction with regard to an expansion plan of a virtual surface that is obtained by connecting the innermost peripheral parts of the cylindrical inner peripheral surface, that are recessed from the virtual surface toward the outside in the radial direction, and that have a position difference in the cylindrical axial direction and have a phase difference in the cylindrical circumferential direction. As a result, a die structure for heading can be used to mass produce high-precision compound screws by means of heading.

Inventors:
MICHIWAKI Hiroshi (3-10-25 Sumiyoshi-cho, Nishitokyo-sh, Tokyo 05, 〒2020005, JP)
Application Number:
JP2015/054489
Publication Date:
October 01, 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:
B21J13/02; B21K1/56; F16B35/00; B21H1/00
Foreign References:
US0168214A1875-09-28
JP2013043183A2013-03-04
JPS4891450A1973-11-28
JPS5057053A1975-05-19
JP2004237371A2004-08-26
US0357768A1887-02-15
JP2001234914A2001-08-31
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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