Sometimes I hear some customers of mold factories complain that the guide bush is strained. In fact, there are many reasons for the Guide bush to be strained. As long as we find the reason, we can avoid this happening. First, for the occurrence of the guide pin and guide sleeve being strained, it is recommended to set a higher pressure when the mold is opened slowly. If the guide pin and guide sleeve needs to be used with a mold release agent, the mold is not polished enough, which makes it difficult to demold the product, even strains, cracks, and top cracks. If this phenomenon occurs, strengthen the mold polishing. In addition, it is also difficult to demold the guide pin and guide sleeve when the injection pressure is too high, the speed is too fast, the injection time and the holding time are too long; the main reasons for the difficulty of mold opening are the following:
a. The mold guide pillar is not vertical or has an offset phenomenon, which makes it difficult to separate the front and rear molds, and it is more difficult to open the mold when the production heats up. If this is the case, the guide pillar will be pulled and seized;
b. If the front and rear molds have too many inserts, and the fit is too tight or even the inserts are damaged, it will be difficult to open the mold;
c. The gap between the guide pin and the guide sleeve is too small, and the improper cooling water of the front and rear molds cause uneven cooling and heating, and it is difficult to open the mold;
d. For molds with sliders, if the sliders are too tightly fitted or the sliders are bitten, it will be difficult to open the mold, etc.
Therefore, in the process of using the guide post and guide sleeve, be sure to eliminate the above phenomena to avoid the guide post and guide sleeve from being strained.