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Powder Metallurgy Molding Technology
Aug 12, 2018

  Powder metallurgy molding technology is the process of filling the pre-mixed powder into the designed mold cavity, applying certain pressure to form the designed product, and then the product is released from the mold cavity by the press.Molding is a basic powder metallurgy process second only to sintering in importance.The whole process of powder metallurgy production is more limited and determined than other processes.

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A) whether the forming method is reasonable or not directly determines whether it can be carried out smoothly.

B) affect subsequent processes (including auxiliary processes) and final product quality.

C) affect the automation, productivity and production cost of production.

Molding press.

1. There are two forms of mold surface in the forming press:

A) floating in mold surface

B) the middle die surface is fixed

2. There are two types of floatation modes in the mold surface of the forming press:

A) the demoulding position is fixed and the molding position can be adjusted

B) the molding position is fixed and the demoulding position can be adjusted

Generally, medium mold surface fixation type is adopted for small pressure tonnage, while medium mold surface fluctuation is adopted for large pressure tonnage.

2. Forming three steps.

1. Filling stage: from the end of demoulding to the end of the rising of the middle die surface to the end of the highest point, the operating Angle of the press starts from 270 degrees to about 360 degrees.

2. Pressure stage: it is the stage when the powder is compressed into the mold cavity.Generally, the upper mold is pressurized and the middle mold surface is decreased (i.e., the lower pressure) is pressurized. Sometimes, the final pressure is also applied.

3. Demoulding stage: this process is the process in which the product is pushed out of the mold cavity.The operating Angle of the press starts from 180 degrees to 270 degrees.

B) the middle die surface is fixed

2. There are two types of floatation modes in the mold surface of the forming press:

A) the demoulding position is fixed and the molding position can be adjusted

B) the molding position is fixed and the demoulding position can be adjusted

Generally, medium mold surface fixation type is adopted for small pressure tonnage, while medium mold surface fluctuation is adopted for large pressure tonnage.


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