Shenzhen Zhucheng Powder Metallurgy Co., Ltd.

MIM process

The process combines the flexibility of injection molding design with the high strength and integrity of precision metals to achieve a low-cost solution for parts with extremely complex geometries.

The process is divided into four unique processing steps (mixing, molding, degreasing and sintering) to realize the production of parts, and the need for surface treatment is determined according to the product characteristics.

 

混料

I.Mixing

The mixing process is carried out in a special mixing device, which is heated to a certain temperature to melt the binder. In most cases, mechanical mixing is used until the metal powder particles are evenly coated with binder, and then put into the machine to squeeze into strips and cut into granules (called raw materials), which can be directly put into the injection molding machine for injection molding.

成型

(ii)Molding

The equipment and techniques of injection molding are similar to those of injection molding. The granular raw material is fed into the machine to be heated and injected into the mold cavity under high pressure. Only the cavity size design, to take into account the product in the sintering process shrinkage. The shrinkage rate of each metal material is known and accurate.

脱脂

(iii)degreasing

Degreasing is the process of removing the binder from the molded part. This process is usually done in several steps. Most of the binder is removed before sintering, and the remaining part can support the part into the sintering furnace.

The injection company currently has a degreasing and sintering integrated machine, that is, the degreasing and sintering of molded parts are automatically completed in one machine.

烧结

(iv)sintering

The degreased parts are placed in a high temperature, high pressure controlled sintering furnace. The part is slowly heated under a gas shield to remove residual adhesive.

After the binder is completely removed, the part is heated to a very high temperature, and the voids between the particles disappear due to the fusion of the particles. High densification of MIM parts is achieved by high sintering temperatures and long sintering times. So as to greatly improve and improve the mechanical properties of parts materials.

 

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