| 摘要 |
A sinter of stable quality is produced by molding a powder for powder metallurgy. This process comprises successively conducting the following steps:
a charging step in which a powder for powder metallurgy comprising particles (6) and a solid lubricant (8) incorporated therein is charged into a mold (1);
a powder compact formation step in which the powder for powder metallurgy charged into the mold (1) is compacted to form a powder compact (10);
a powder compact release step in which the compact (10) is taken out of the mold (1);
and the charging step in which the powder for powder metallurgy is charged again into the mold (1) after the powder compact release step. The compact (10) is sintered to produce a sinter. The temperature of the mold (1) is set at a value in the range of from the boiling point of water to the melting point of the solid lubricant. The compact (10) can be continuously formed without causing, e.g., a failure in the feeding of the powder for powder metallurgy. The sinter obtained by sintering the compact (10) is almost even in strength and density. Thus, a stable sinter almost even in strength and density can be produced. |
