Title:
SHOT PEENING TREATMENT METHOD FOR STEEL PRODUCT
Document Type and Number:
WIPO Patent Application WO/2011/040243
Kind Code:
A1
Abstract:
Provided is a method for performing shot peening (hereinafter abbreviated as "SP") on a treatment surface of a work piece which is a steel product that was subjected to heat hardening, the aforementioned method being such that it is possible to remarkably improve the durability (heat cycle resistance in particular) of the heat hardened surface of the aforementioned steel product. The aforementioned method for performing SP treatment on the work piece, which is the steel product subjected to heat hardening, includes a first SP treatment which removes a chemical compound layer (white layer) produced by heat hardening, as well as a second SP treatment which provides compressive residual stress to a first SP treated surface of the work piece subjected to the first SP treatment. By means of nondestructive inspection, an acceptance/rejection decision is made depending on whether or not the chemical compound layer is removed subsequent to the first SP treatment, and thereafter, the second SP treatment is performed only on an accepted article.
Inventors:
KOBAYASHI YUJI (JP)
Application Number:
PCT/JP2010/065952
Publication Date:
April 07, 2011
Filing Date:
September 15, 2010
Export Citation:
Assignee:
SINTOKOGIO LTD (JP)
KOBAYASHI YUJI (JP)
KOBAYASHI YUJI (JP)
International Classes:
B24C1/10; B24C1/00; C21D1/06; C21D7/06; C23C8/26
Foreign References:
| JP2008195994A | 2008-08-28 | |||
| JP2005294282A | 2005-10-20 | |||
| JP2005203729A | 2005-07-28 | |||
| JP2009076922A | 2009-04-09 | |||
| JP2007056333A | 2007-03-08 | |||
| JP2003191166A | 2003-07-08 | |||
| JPH0464009A | 1992-02-28 | |||
| JPH10217122A | 1998-08-18 | |||
| JP2003191166A | 2003-07-08 | |||
| JPH05156351A | 1993-06-22 | |||
| JP2002166366A | 2002-06-11 | |||
| JP2006131922A | 2006-05-25 |
Other References:
See also references of EP 2484493A4
MASAHIKO HIBARA: "Prolongation of Life of Casting die", 2003, NIKKAN KOGYO SHIMBUN, pages: 103 - 104
MASAHIKO HIBARA: "Prolongation of Life of Casting die", 2003, NIKKAN KOGYO SHIMBUN, pages: 103 - 104
Attorney, Agent or Firm:
YAMASAKI, Yukuzo et al. (JP)
Yukuzo Yamazaki (JP)
Yukuzo Yamazaki (JP)
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