The core process difficulties of metal powder injection molding mainly include interface morphology control during co injection, material co sintering bonding problems after co injection, and various defects that may occur during the process. ?

The control of interface morphology in the co injection process is a challenge, especially in the co injection molding of sandwich powders, where it is easy to encounter cutting-edge breakthroughs and uneven thickness of the core-shell layer at different positions of the product, which can affect the performance of the product.

Attention should also be paid to the issue of co sintering and bonding of materials after co injection, as the sintering shrinkage behavior of the two materials is different, resulting in inconsistent shrinkage and interface stress, which may reduce the interface bonding strength and even lead to cracking in severe cases.

Various defects that may occur during the manufacturing process, such as weld lines, surface roughness, cracks, and surface effects, need to be addressed by adjusting process parameters and optimizing process conditions. For example, by increasing the injection rate, holding pressure value, and raising the injection temperature and mold temperature, the problem of weld lines can be improved; Improving surface roughness by increasing the temperature settings of metal molds, barrels, and nozzles; Prevent crack formation by reducing injection temperature and injection efficiency, and ensuring sufficient pressure retention.

The solution to these process difficulties is crucial for ensuring the quality and performance of metal powder injection molded products, and requires continuous process optimization and technological innovation to overcome them.
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