How to overcome the change of dimension of plastic parts in injection molding?
In the injection mold injection molding test, if the size change of the plastic parts is found to be unstable, it should be adjusted from the following aspects:
1) the finishing injection machine makes the work of its electrical system and hydraulic system stable and reliable.
2) try to improve the mold strength. If the positioning rod is bent or worn, it should be replaced.
3) strictly control the molding conditions such as injection temperature, injection pressure and injection speed, so that the molding cycle of each plastic piece is stable and consistent.
4) adjust the precision of the mould so that the moving parts can move smoothly and locate the parts accurately.
5) check the mould clamping force during mold closing.The clamping force should be large when the mold is closed.
6) when the multi-cavity injection molding, the gate should be of the same size, so that the feeding balance of each cavity is made.
7) strictly control the dosage of each injection, and it should be quantified, not too much or too little.
8) check the quality of the plastic, the particle should be uniform, the shrinkage rate is stable, and the material can be changed when necessary.