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Sintered machine part and method
| Details |
Inventors: Saka, Tsutomu; Fujiwara, Akira; Tsutsui, Tadayuki; Murai, Osamu; Ishii, Kei;
Assignee: Hitachi Powdered Metals Co., Ltd. (Chiba, JP); Honda Giken Kogyo Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Lechert, Jr.; Stephen J.
Assistant Examiner:
Attorney, Agent or Firm: Sandler, Greenblum & Bernstein
A method of manufacturing a sintered machine part, by which the machine part can be manufactured to be sufficiently strong, wear and abrasion resistive, and durable against the fatigue caused by recursive impacts, without the heat treatments. In the method, a machine part composed of 0.1 to 0.8% of carbon by weight, 2 to 6% of nickel by weight, 0.6 to 1.6% of molybdenum by weight, 1 to 3% of copper by weight and balance iron is manufactured by mixing partially diffused alloy powder composed of 2 to 6% of nickel by weight, 0.4 to 0.6% of molybdenum by weight, 1 to 3% of copper by weight and balance iron with graphite powder amounting to 0.1 to 0.8% by weight and molybdenum simple powder having 2 to 7 .mu.m mean particle size amounting to 0.2 to 1% by weight, and then by compacting the mixed powder and sintering the compact. |
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DETAILED DESCRIPTION It is, therefore, an object of the present invention is to provide a method of manufacturing a sintered machine part, by which the machine part can be manufactured to be sufficiently strong, wear and abrasion resistive, and durable against the fatigue caused by recursive impacts, without the heat treatments.
In accordance with the present invention, there is provided a method of manufacturing a sintered machine part, the machine part being composed of 0.
1 to 0.
8% of carbon by weight, 2 to 6% of nickel by weight, 0.
6 to 1.
6% of molybdenum by weight, 1 to 3% of copper by weight and iron for a rest, the method comprising steps of: (a) mixing partially diffused alloy powder composed of 2 to 6% of nickel by weight, 0.
4 to 0.
6% of molybdenum by weight, 1 to 3% of copper by weight and balance iron with graphite powder amounting to 0.
1 to 0.
8% by weight and molybdenum simple powder amounting to 0.
2 to 1% by weight; (b) compacting the mixed powder obtained in the step (a) by compression to form a compact for a machine part; and (c) sintering the compact obtained in the step (b).
The method of the present invention is particularly suitable for manufacturing a synchronizer hub of a motorcar, because of an improved precision of a product size achievable by the method of the present invention.
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Manufacturing Materials 
