To provide a technique for manufacturing a gear, which technique can keep an appropriate temperature, and can make the gear compact by reducing its porosity.
A sintered gear material 1 processed by sintering is heated by heating devices 2, 3, and is rolled by the warm-rolling process. The heating devices 2, 3 are coaxially arranged with the sintered gear material 1 rotatably mounted so as to surround and cover tooth flank portions. The sintered gear material 1 is heated by moving the heating devices 2, 3 in the direction parallel with the axis of the sintered gear material 1. Dies 6a, 6b of a rolling apparatus advance and are pushed into the sintered gear material 1 to roll the gear in the state that the sintered gear material 1 is heated and the heated temperature is kept. By this rolling process, the sintered gear material 1 becomes a compact gear product having a small porosity.
TAKEMASU MITSUIE
AMANO SHUICHI
Sadao Enjoji
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