China Metal Industry MIM Technical Characteristics

Metal powder injection molding combines the advantages of the two technologies of powder metallurgy and plastic injection molding, breaking through the traditional metal powder molding process in the product shape limitation, and at the same time using plastic injection molding technology to produce large quantities and high efficiency with complex shapes Parts: such as various external grooves, external threads, tapered external surfaces, cross holes, blind holes, recesses, key pins, stiffener plates, surface knurling, etc.

·The advantages of MIM technology

a. Directly form parts with complex geometric shapes, usually weighing 0.1~200g

b. Good surface finish, high precision, typical tolerance is ±0.05mm

c. Good alloying flexibility, wide application range of materials, product density of 95%~99%, uniform internal structure, no internal stress and segregation

d. High degree of production automation, no pollution, can realize continuous mass clean production

Metal injection molding(MIM) is a new type of powder metallurgy near netshaping technology that extended from the plastic injection molding industry. As we all know, plastic injection molding can produce various kinds of parts with very complex shape with pretty cheap prices, but plastic products’ strength is too low, to improve the strength we can add metal/ceramic powder in the plastic to get products with better strength and better wear resistance. 

The processes for MIM are: first is to choose the metal powder and binder as required; Then use the appropriate method under a certain temperature to mix powder and binder into uniform feeding; Granulating and then injection molding; Decreasing the blank parts and sintering densification into finished products. 

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