Why are MIM auto parts deformed by metal injection molding?

Why are MIM auto parts deformed by metal injection molding?

Metal injection molding (MIM) is a near net forming process. It can not only obtain parts with high density, good mechanical properties, and small surface roughness, but also produce parts with complex structures in large quantities and efficiently. Generally, continuous finishing is not required, and the cost of parts is reduced, which promotes the development of lightweight vehicles and reduces environmental pollution. Therefore, it has attracted the attention of the automotive industry. However, when using metal injection molding (MIM) technology to produce precision parts for automobiles, we will find that some parts will have deformation problems, which will affect the product effect and precision. So why will metal injection molding (MIM) automobile parts deform? The following is a brief introduction of Zhongwei Precision Editor:

Powder metallurgy MIM

1: Part design problems

The influence of the wall thickness of automobile parts on deformation is usually different due to the different types of metal materials. For some special materials, the wall thickness is too thin and the orientation is serious. Many metal injection molding MIM manufacturers will increase the wall thickness appropriately in the design to reduce the adverse effect of molecular orientation. At the same time, increasing the wall thickness appropriately also increases the hardness of automobile parts to a certain extent, MIM metal injection molding technology can effectively reduce the deformation of automotive parts.

2: Raw materials for metal injection molding

The MIM manufacturer of metal injection molding said that the molecular structure of resin in plastics can be divided into crystalline plastics and amorphous plastics. The main difference between crystalline plastics and amorphous plastics is whether the resin molecules can form a certain degree of regular arrangement from the molten state, forming a certain degree of regular arrangement, which is called crystalline, and vice versa, which is called amorphous. Therefore, the molding raw materials will cause problems such as deformation during the injection molding of automobile parts.

3: MIM metal injection molding method

Now many metal injection molding MIM manufacturers have developed a variety of powder metallurgy injection molding technologies such as ultra-high speed injection molding and gas assisted molding on the basis of traditional injection molding. In particular, the application of gas assisted molding (Forming) has gradually transited from the original simple shaped products such as handles and handrails to the manufacturing of complex precision parts such as household appliances, stereos, cars, office supplies, toys, etc.

The above are the three main reasons for the deformation of metal injection molding MIM auto parts, which requires metal injection molding MIM manufacturers to ensure that each possible factor should be checked and inspected during production to avoid large quantities of deformed products. High quality and high-precision powder metallurgy structural parts are customized, so we choose zhongwei precision.