Title:
METHOD FOR PRODUCTION OF GROOVED BOLT
Document Type and Number:
Japanese Patent JP2012066298
Kind Code:
A
Abstract:
To provide a method for production of a grooved bolt capable of securing thread accuracy and improving productivity without needing additional processes.
The method for production of a grooved bolt includes: forming a bolt-gripping part 8c on an underhead section 8 of a bolt raw material 15 by pinching the underhead section 8 to roll in the molding part of a guide-forming die 11; starting the formation of a thread 7a on a thread-forming part at the molding part of a thread-forming die 12; and then pinching and rolling the bolt-gripping part 8c in the finishing section of the guide-forming die 11 to perform the finish machining of the thread 7a at the finishing section of the thread-forming die 12 using the bolt-gripping part 8c as a guide.
Inventors:
MAEDA HIDEAKI
KINOSHITA NOBORU
KINOSHITA NOBORU
Application Number:
JP2010214872A
Publication Date:
April 05, 2012
Filing Date:
September 27, 2010
Export Citation:
Assignee:
DAIHATSU MOTOR CO LTD
BOLTZ CO LTD
BOLTZ CO LTD
International Classes:
B21H3/02; B21H3/06
Domestic Patent References:
JPH0947833A | 1997-02-18 | |||
JPS62244543A | 1987-10-24 | |||
JPH01104434A | 1989-04-21 | |||
JP2002331329A | 2002-11-19 | |||
JPH04187337A | 1992-07-06 | |||
JPH0949515A | 1997-02-18 |
Attorney, Agent or Firm:
Tsutomu Shimoichi