How to troubleshoot the failure of the injection mold?-part5

December 30, 2021

5. The ejector rod is bent, broken or leaking

The self-made ejector rods are of better quality, but the processing cost is too high. Nowadays, standard parts are usually used and the quality is average. If the gap between the ejector pin and the hole is too large, leakage will occur, but if the gap is too small, the ejector pin will become stuck due to the increase in mold temperature during injection. What's more dangerous is that sometimes the ejector rod will not move and break when it is ejected for a normal distance. As a result, the ejector rod exposed during the next mold clamping cannot be reset and the die will be damaged.

In order to solve this problem, the ejector rod was re-ground, and the mating section of 10~15 mm was retained at the front end of the ejector rod, and the middle part was ground 0.2 mm smaller. After all ejector rods are assembled, the fit clearance must be strictly checked, generally within 0.05~0.08 mm, to ensure that the entire ejector mechanism can move forward and backward freely.

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