Injection parts have orientation. When molten injection material passes through nozzles and runners at high speed, wood flour and fibrous fillers will rank in the direction of flow. The mechanical strength and physical properties of injection parts are directional, which can easily cause warpage deformation of injection parts.

emperature affects every step in the process of injection moulding and must be managed properly. Temperature control installed in the injection machine is a method to ensure the correct temperature. When entering the barrel, the material is heated and mixed, and the temperature curve must be carefully set to ensure complete melting and mixing but not burning.

In MIM, the mould is very important, which affects the final parts quality. If the protection is not good, the mould will rust. We must pay attention to it. Through reasonable analysis, we can finish production more efficiently.

After decades of elaborate design, excellent equipment manufacturers, researchers and engineers have made significant progress in the process. Starting from the combination of metal powder and polymer binder, MIM provides raw materials for injection moulding. In the moulding machine, the raw material becomes sticky, when the polymer binder is heated in the moulding barrel. Then the raw material is injected into the mould, which is similar to the formation of plastic parts. Since the adhesive system is only used in the forming process, it needs to be removed from the parts. This can be achieved by heat treatment or solvent extraction. After degreasing, the parts are sintered in vacuum or continuous furnace at very high temperature. During sintering, the parts density can reach 96-98%.

Micro injection molding products have broad application in actuators, sensors, pocket consumer products, weapons, aerospace, electronic assembly tools, oxygen analyzers, filters and medical care equipment.

At present, with appropriate fine powder, the metal or ceramic parts with 25~50 um thickness, local structure details less than 5um and surface roughness 2~3 -uM can be obtained.

Metal injection molding is a multi disciplinary technology, and it is one of the advanced precision forming processes of metal parts.