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Patent Searching and Data


Title:
MULTIPLEX SCREW FORM-ROLLING DIE AND METHOD FOR MANUFACTURING MULTIPLEX SCREW BOLT USING THIS DIE
Document Type and Number:
Japanese Patent JP2008221272
Kind Code:
A
Abstract:

To provide a multiplex screw form-rolling die, improving the durability of a screw-working part near the edge surface of the die body, and a method for manufacturing a multiplex screw bolt using the die.

In the multiplex screw form-rolling die 1 provided with the ridge part 5a of an ordinary screw threading part 5 spreading the ordinary screw and projections 6 corresponding to a slender screw thread periodically formed in a bottom part 5b of a screw threading part 5, corresponding to the positional lag between a slender screw threading part spreading the slender screw and the ordinary screw ridge; a prescribed width range from the edge surface 1a of the die body is made to be a single ordinary screw threading part 8 provided with the threading part 8a and the bottom part 8b of the ordinary screw-thread spreading to the ordinary screw and not provided with the projection part 6 corresponding to the slender screw-thread.


Inventors:
TAKEMASU MITSUIE
MIYAHARA HIROSHI
Application Number:
JP2007061881A
Publication Date:
September 25, 2008
Filing Date:
March 12, 2007
Export Citation:
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Assignee:
SANGAKU RENKEI KIKO KYUSHU KK
International Classes:
B21H3/04
Attorney, Agent or Firm:
Hisashi Kato
Mikio Hotta