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Title:
HIGH-PRECISION SINTERED CAM LOBE MATERIAL
Document Type and Number:
WIPO Patent Application WO/2004/031429
Kind Code:
A1
Abstract:
A high-precision sintered cam lobe material that while having high anti-wear and anti-pitching properties, even when it is intended to fabricate a cam lobe of complex configuration, realizes high dimensional accuracy and unnecessitates grinding after assembly; a process for producing the same. In particular, a high-precision sintered cam lobe material consisting of a sintered cam lobe material obtained by performing compression molding and sintering of sinter powder once or multiple times so as to form a molding of given configuration and further tempering according to necessity. The sintered cam lobe material is constituted of an iron base sintered alloy comprising one or both of 0.3 to 5.0 wt.% of Ni and 0.2 to 4.0 wt.% of Cu, 0.5 to 1.2 wt.% of C, unavoidable impurities and the balance of Fe. The sintered cam lobe material has a density of 7.3 g/cm3 or more and a cam circumferential hardness of 45 or higher HRC, and the ratio of dimensional change of sintered body obtained in the final sintering step from molding obtained in the final compression step is within ±0.5%.

Inventors:
Takamura, Hiroyuki c/o NIPPON PISTON RING CO. (LTD. Tochigi Factory 1111 Nogi, Nogi-mach, Shimotsuga-gun Tochigi, 329-0114, JP)
Application Number:
PCT/JP2003/012021
Publication Date:
April 15, 2004
Filing Date:
September 19, 2003
Export Citation:
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Assignee:
NIPPON PISTON RING CO., LTD. (12-10, 5-chome Honmachi-Higashi, Chuo-k, Saitama-shi Saitama, 338-8503, JP)
Takamura, Hiroyuki c/o NIPPON PISTON RING CO. (LTD. Tochigi Factory 1111 Nogi, Nogi-mach, Shimotsuga-gun Tochigi, 329-0114, JP)
International Classes:
B22F3/12; B22F3/24; C22C33/02; C22C38/00; C22C38/08; C22C38/10; C22C38/16; F01L1/04; F16H53/02; (IPC1-7): C22C38/00; B22F3/24; C22C33/02; C22C38/16; F01L1/04; F16H53/02
Attorney, Agent or Firm:
Kishimoto, Tatsuhito c/o Tokyo, Central Patent Firm (4th Floor Oak Building Kyobashi, 16-10, Kyobashi 1-chom, Chuou-ku Tokyo, 104-0031, JP)
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