The Process System Of Powder Forging

Publish Time: 06/28 2021 Author: Site Editor Visit: 16404

Traditional ordinary die forging and mechanical processing methods have been unable to meet the requirements of high quality, high precision, high efficiency, low consumption and low cost in today's industrial production of automobiles and motorcycles. The powder forging process is a relatively competitive, non-cutting metal processing method developed by the organic combination of powder metallurgy process and precision forging.

Powder forging uses metal powder as raw material, pre-formed and pressed, and heated and sintered in a protective atmosphere. As a forging blank, it is forged on a press at one time and realizes flash-free precision die forging to obtain the same density and complex shape as ordinary die forgings. Precision forgings. Requirements of powder forging process:

Ingredients and mixtures. According to the material and performance requirements of different products, select the appropriate low-alloy steel powder, calculate the ingredients and accurately weigh the powder, and mix it in the mixer until it is evenly distributed.
Press the preform. The powder is pressed into a preform on the press. The design of the preform should be reasonable, and its density, quality, quality change and size should be strictly controlled to avoid overloading and damaging the mold.
Sintering. It is carried out in a sintering furnace with a reducing protective atmosphere at a temperature of 1100 to 1130°C to complete alloying. Then, the sintered body is moved into a heat preservation furnace (about 1000°C) in a non-oxidizing atmosphere for heat preservation.
Closed die forging. At present, there are two forging processes for sintered bodies: one is to use the waste heat of the sintered body to keep it to the forging temperature and immediately forge to save energy; the other is to reheat the sintered body after it has cooled to room temperature, and then perform forging. Energy consumption is relatively increasing. When the sintered body is densified and closed die forging, the sintered body with 80% of the theoretical density can be forged until it is close to 100% of the theoretical density. It must be pointed out that in the forging deformation, the shape of the preform should be designed reasonably to reduce the lateral flow of metal and reduce the wear of the forging die.

The powder forging process not only has the advantages of better powder metallurgy forming performance, but also has the characteristics of forging deformation that can effectively change the structure and performance of metal materials, making powder metallurgy and forging processes have achieved new breakthroughs in production, especially suitable for large batches It produces high-strength, complex-shaped parts, so it has a great development prospect for popularization and application in various industrial sectors.

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