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Title:
SCREW PART WITH CUT PORTION AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
Japanese Patent JP2003278729
Kind Code:
A
Abstract:

To provide a screw part with a cut portion for removing painting formed simultaneously with a screw thread by thread rolling, and a manufacturing method therefor.

A shaft part 5 of a screw part raw material formed in series of a head part 3 engaging with a fastening tool is thread-rolled by a thread rolling dies having a crest shaped projecting strip crossing a projecting strip for forming the screw thread on the thread rolling surface, and thereby the screw thread 4 is formed on the shaft part 5 and the cut portion 11 for removing painting is formed near tip of the screw thread 4 in the crossing direction of the screw thread 4. Root diameter of the cut portion 11 is larger than inner diameter of a female screw to be screwed, and thereby lowering of screw thread shearing strength is prevented and accordingly the screw thread 4 on which the cut portion 11 is formed is used as a normal screw thread 4.


Inventors:
Mizuno, Hiromichi
Kasagi, Yoshito
Ogo, Michiaki
Application Number:
JP2002000088507
Publication Date:
October 02, 2003
Filing Date:
March 27, 2002
Export Citation:
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Assignee:
AOYAMA SEISAKUSHO CO LTD
International Classes:
B21H3/06; F16B33/02; F16B35/00; F16B35/04; B21H3/02; (IPC1-7): F16B35/00; B21H3/06



 
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