METHOD OF INCREASING STRENGTH OF COLD WORKED PART BY ULTRASONIC SHOCK TREATMENT, AND METAL PRODUCT WITH HIGH FRACTURE TOUGHNESS AND FATIGUE STRENGTH

Title:

METHOD OF INCREASING STRENGTH OF COLD WORKED PART BY ULTRASONIC SHOCK TREATMENT, AND METAL PRODUCT WITH HIGH FRACTURE TOUGHNESS AND FATIGUE STRENGTH

Document Type and Number:

WIPO Patent Application WO/2004/046397

Kind Code:

A1

Abstract:

A method of increasing the strength of a cold worked part by an ultrasonic shock treatment, characterized by comprising the step of applying the ultrasonic shock treatment to the tensile side surface of the cold bending worked part of a metal, whereby the hardness of the surface can be increased by 10% or higher than the hardness of the surface to which the ultrasonic shock treatment is not applied, and the fracture toughness and the fatigue strength of the metal can be increased by reducing a residual tensile stress.

Inventors:

TOMINAGA TOMONORI (JP)
MATSUOKA KAZUMI (JP)
HONMA KOJI (JP)

Application Number:

PCT/JP2003/014670

Publication Date:

June 03, 2004

Filing Date:

November 18, 2003

Export Citation:

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Assignee:

NIPPON STEEL CORP (JP)
TOMINAGA TOMONORI (JP)
MATSUOKA KAZUMI (JP)
HONMA KOJI (JP)

International Classes:

B21D5/01; C21D7/04; (IPC1-7): C21D7/04; B21D5/01

Foreign References:

JPH09234585A	1997-09-09
US6171415B1	2001-01-09
JPS6479320A	1989-03-24
JPH081514A	1996-01-09
JP2003113418A	2003-04-18
JPS61202727A	1986-09-08
JPS50157249A	1975-12-19
JPS4736147B1
US3622404A	1971-11-23

Attorney, Agent or Firm:

Aoki, Atsushi (ISHIDA & ASSOCIATES Toranomon 37 Mori Bldg., 5-1, Toranomon 3-chom, Minato-ku Tokyo, JP)

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