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New development technology of MIM metal injection molding (2)

Categories: ZCMIM NewsStars: 3StarsVisit: -Release time: 2019-04-01 11:25:00
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MIM metal injection molding process is a multidisciplinary crossover technology and one of advanced precision molding processes for metal parts.

MIM metal injection molding process has gradually been recognized, accepted and valued. In order to achieve more complex parts production requirements, many fields have been introduced MIM and achieved vigorously innovation, thus new technologies and new processes of metal injection molding are constantly emerging and applied to development and production.

1. Gas (liquid) assisted molding technology

The working principle of gas (liquid) assisted molding is to inject a certain amount (50%~80% by volume) of molten injection into cavity, and then charge pressurized gas or water from inside to make product hollow. The molten material expands and fully conforms to the inner wall of cavity. Since the thicker core is solidified at last, this portion is most easy to be hollow.

The gas (liquid) assisted molding process has great freedom of design, and product with large difference in wall thickness is easy to molding; injection pressure can be reduced to average internal pressure distribution. Stress reduced, deformation reduced, Collapse reduced and surface quality improved; de-binding time can be shortened, material consumption can be reduced, and weight of the parts can be reduced.

The gas (liquid) assisted molding technology has been successfully applied to fields of golf club heads, door handles, handicrafts, etc., and effect is remarkable.

2. Processing and assembly technology of injection green parts

Although strength of green part before de-binding is much lower than metal parts after sintering, it still has an certain of strength and can be processed and trimmed.

Increase or reduce material can be carried out to change green part’s size and shape. It is possible to perform material removal processing such as gate cutting, parting line processing, drilling, chamfering, etc. on green part before de-binding.

Traditional assembly process is to join parts after sintering, but it is also feasible to combine green parts before de-binding. There are three methods: the first one is to perform second injection molding after inserting the first injection part; the second is molding multi- composite material; and the third is to assemble a green part into another before de-binding.

If individual green parts are made from same material, matched de-binding and sintering shrinkage can ensure a good combination; if individual green parts are from different materials, measures must be taken to prevent crack.

This technology can simplify mold structure, reduce mold cost, make more complex shapes which is difficult for traditional process, make composite parts with different performance and functional requirements or saving precious raw materials.

Keywords in the article: MIM metal injection molding
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