Metal deforming – By shot-blasting
Patent
1995-03-22
1997-01-14
Jones, David
Metal deforming
By shot-blasting
29 907, C21D 706, C21D 800
Patent
active
055928404
ABSTRACT:
By shot-peening, shots having almost spherical shape are impacted against a surface of a portion of a metal-product, the portion being one which is to be subjected to sliding action. The shots have a hardness higher than that of the metal-product. By the shot-peening, the surface of the metal-product is heated to a temperature higher than a predetermined temperature and very small concave portions, each having a circular arc-shaped cross section, are formed due to the impact of the shots. As a result, the structure of the surface layer of the sliding portion has high internal stress, high hardness and high toughness. Further, since very small concave portions are formed on the surface of the sliding portion, the surface tension of lubricating oil is not decreased and a stable oil film can be formed. In addition, the surface retains high hardness and toughness, even if sliding is performed for long time periods, and the concave portions are not deformed so that a stable oil film can be maintained.
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English Abstract, JP 5-186822, filed 27 Jul. 1993.
English Abstract, JP 2-254144, filed 12 Oct. 1990.
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English Abstract, JP 5-33047, filed 9 Feb. 1993.
Fuji Kihan Co., Ltd.
Jones David
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