The most common causes of injection mold failures and their troubleshooting methods are detailed below:

Difficult to remove the gate

During the injection molding process, the gate is stuck in the sprue bushing and is not easily peeled off. When the mold is opened, the product is cracked. In addition, the operator must use the tip of the copper rod to knock out from the nozzle, so that it can be released after being loosened, which seriously affects the production efficiency. The main cause of this failure is the poor smoothness of the gate cone and the presence of tool marks in the circumferential direction of the bore. Secondly, the material is too soft. After a period of use, the small end of the tapered hole is deformed or damaged, and the spherical curvature of the nozzle is too small, so that the gate material produces a rivet head here. The taper hole of the sprue sleeve is difficult to process. Standard parts should be used as much as possible. If you need to process it yourself, you should also make a special reamer. The tapered hole needs to be ground to Ra0.4 or higher. In addition, a gate pull rod or gate ejection mechanism must be provided.