摘要:
A first die (21D) is sequentially filled with a first-layer mixed powder (100F) that is a mixture of a basic metal powder having a small particle size and a low-melting-point lubricant powder, a second-layer mixed powder (100S) that is a mixture of the basic metal powder having a large particle size and the low-melting-point lubricant powder, and a third-layer mixed powder (100T) that is a mixture of the basic metal powder having a small particle size and the low-melting-point lubricant powder. A first pressure is applied to each mixed powder to form an intermediate green compact (110). The intermediate green compact (110) is heated, and placed in a second die (41D). A second pressure is applied to the intermediate green compact (110) to form a high-density three-layer green compact.
摘要:
A first die is filled with a mixed powder including a lubricant. A first pressure is applied to the mixed powder to form a mixed powder intermediate compressed body having a true density ratio of 85 to 96%, provided that the maximum density of the mixed powder intermediate compressed body that can be molded by applying the first pressure is 100%. The mixed powder intermediate compressed body is heated to the melting point of the lubricant powder. The mixed powder intermediate compressed body is placed in a second die that is pre-heated to the melting point. A second pressure is applied to the mixed powder intermediate compressed body in the second die to form a high-density mixed powder final compressed body.
摘要:
A first die (21D) is filled with a mixed powder (100) that is a mixture of a basic metal powder and a low-melting-point lubricant powder. A first pressure is applied to the mixed powder to form a mixed powder intermediate compressed body (110) having a protrusion (110A) that protrudes in the pressing direction as compared with the configuration of a mixed powder final compressed body (120). The mixed powder intermediate compressed body (110) is heated to the melting point of the lubricant powder. The heated mixed powder intermediate compressed body (110) is placed in a second die (41D). A second pressure is applied to the mixed powder intermediate compressed body (110) to press-mold the mixed powder intermediate compressed body (110) while crushing the protrusion (110A) in the pressing direction to form the high-density mixed powder final compressed body (120) having high density and the desired configuration.
摘要:
A mixed powder (100) placed in a container cavity (24) is transferred to the cavity of a first die (31). A first pressure is applied to the mixed powder (100) in the first die (31) to form an intermediate green compact (110). The first die (31) and the intermediate green compact (110) are heated to heat the intermediate green compact (110) to the melting point of a lubricant. The heated intermediate green compact (110) is transferred to the cavity of a second die (61), and a second pressure is applied to the intermediate green compact (110) to form a high-density final green compact.