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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 (Toyokawa Seisakusho, 1, Honohara 3-chome, Toyokawa-sh, Aichi 61, 〒4420061, JP)
Application Number:
JP2010/065952
Publication Date:
April 07, 2011
Filing Date:
September 15, 2010
Export Citation:
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Assignee:
SINTOKOGIO, LTD. (28-12, Meieki 3-chome Nakamura-ku, Nagoya-sh, Aichi 02, 〒4500002, JP)
新東工業株式会社 (〒02 愛知県名古屋市中村区名駅三丁目28番12号 Aichi, 〒4500002, JP)
International Classes:
B24C1/10; B24C1/00; C21D1/06; C21D7/06; C23C8/26
Foreign References:
JP2008195994A2008-08-28
JP2005294282A2005-10-20
JP2005203729A2005-07-28
JP2009076922A2009-04-09
JP2007056333A2007-03-08
JP2003191166A2003-07-08
JPH0464009A1992-02-28
JPH10217122A1998-08-18
JP2003191166A2003-07-08
JPH05156351A1993-06-22
JP2002166366A2002-06-11
JP2006131922A2006-05-25
Other References:
MASAHIKO HIBARA: 'Prolongation of Life of Casting die', 2003, NIKKAN KOGYO SHIMBUN pages 103 - 104
Attorney, Agent or Firm:
YAMASAKI, Yukuzo et al. (Yamasaki & Partners, Sogo Nagatacho Bldg. 8F., 11-28, Nagata-cho 1-chome, Chiyoda-k, Tokyo 14, 〒1000014, JP)
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