| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a sintered metal bearing in which dimensions in the axial direction can be controlled with high precision. SOLUTION: In a compacting stage S2, raw material powder is packed into a packing space formed so as to be divided by a die, a core pin and a lower punch, and thereafter, weight of the raw material powder in the packed state is measured. In a determination part, a difference between the measured weight and a target weight set in advance is calculated, and further, whether the weight difference is settled within a prescribed range determined on the basis of dimensional tolerance is determined. In the case it is determined that the weight difference is out of the above prescribed range, the lower punch is elevated or lowered in accordance with the weight difference so as to perform the adjustment of the packing amount. After the adjustment of the packing amount, the weight of the raw material powder in the packed state is measured once more, and packing amount adjustment and weight measurement are repeated till a difference between the remeasured weight and the target weight is settled within the prescribed range. In the case when it is determined that the weight difference is settled within the prescribed range, compacting by the upper punch is performed in a state where the packing amount is held so as to mold a compacted body. COPYRIGHT: (C)2011,JPO&INPIT
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