Title:
METHOD AND DEVICE FOR FORMING BREAKAGE-STARTING SECTION OF CONNECTING ROD
Document Type and Number:
WIPO Patent Application WO/2014/185348
Kind Code:
A1
Abstract:
A method for forming a breakage-starting section of a connecting rod in which breakage-starting sections of a connecting rod (1) made of a metal are formed at facing positions on the inner circumferential surface of a large end section of the connecting rod (1), the method being characterized in having a first step for using a first insert tip having a large tip curvature to form a groove (11) at a position corresponding to the breakage-starting section, and a second step for using a second insert tip having a tip curvature smaller than that of the first insert tip to machine the bottom part of the groove so as to reduce the curvature and form a breakage-starting section shaped as a V-shaped groove (12).
Inventors:
KAIMASU YUJI (JP)
MATSUI JUNGO (JP)
MATSUI JUNGO (JP)
Application Number:
PCT/JP2014/062460
Publication Date:
November 20, 2014
Filing Date:
May 09, 2014
Export Citation:
Assignee:
YASUNAGA KK (JP)
International Classes:
B23D3/02; B23P13/00
Domestic Patent References:
| WO2006057259A1 | 2006-06-01 |
Foreign References:
| JP2005034952A | 2005-02-10 | |||
| JPH09201641A | 1997-08-05 |
Attorney, Agent or Firm:
MIYAKAWA Kohichi (JP)
Hirokazu Miyagawa (JP)
Hirokazu Miyagawa (JP)
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