Elimination of under injection defects in metal powder injection molding
Oct 31, 2022
Elimination of under injection defects in metal powder injection molding
The main reason for underinjection is that the flow resistance is too large, which makes the melt unable to continue to flow. The factors that affect the melt flow length include the wall thickness of the part, mold temperature, injection pressure, melt temperature and material composition. These factors will cause short note if they are not handled properly.
https://s.r.sn.cn/w2kfu6
Therefore, how to eliminate the under injection defects of metal powder injection molding is very important. Here is a brief introduction to the elimination methods of the under injection defects of metal powder injection molding by Qinhuangdao zhongwei Precision Editor:
1. Improper control of process conditions: it shall be properly adjusted.
2. The injection capacity of the metal powder injection molding machine is less than the weight of the plastic part: a metal powder injection molding machine with a larger specification should be used.
3. Runner and gate sections are too small: they should be appropriately enlarged.
4. The flow distance of molten materials in the mold cavity is too long or there are thin-walled parts: cold material cavities should be set.
5. The mold exhaust is poor, and the residual air in the mold cavity causes insufficient injection: the mold exhaust system should be improved.
6. Poor flowability of raw materials: resin with good flowability should be used.
7. If the barrel temperature is too low, the injection pressure of the metal powder is insufficient or the injection time of the supplementary material is too short, the injection will also be insufficient. The control quantity of the relevant process parameters should be increased accordingly.
The above is about the elimination of underflow defects in metal powder injection molding compiled by ZHONGWEI, Qinhuangdao. If you want to know more about the metal powder injection molding technology, please consult the MIM technical team of ZHONGWEI, Qinhuangdao, for answers!
