Interpretation of the causes of injection mold problems

Interpretation of the causes of injection mold problems
(1) Ejection should be stable and balanced, such as the total number of ejector pins, the cross-sectional area, the demoulding slope, and the cavity surface should be smooth enough to avoid residual stress concentration and cracking caused by external force.
(2) The structure of the part should not be too thin, and the transition part should avoid arc transition as much as possible to avoid stress concentration caused by sharp corners and chamfers.
(3) Use metal inserts as little as possible to avoid the increase of internal stress caused by different shrinkage rates between the insert and the part.
(4) For deep parts, appropriate demoulding air inlet channels should be set to avoid the formation of vacuum negative pressure.
(5) The main runner should be large enough to allow the gate material to be demoulded before solidification, so that it is easy to demould.

(6) The main runner bushing and the nozzle should be connected to avoid the drag of cold hard material and the part sticking to the fixed mold.