In a multi-cavity mold injection molding, the filling speed of each cavity of many molds will be more or less imbalanced, whether it is fast or slow, if this phenomenon is not obvious, generally it will not produce product quality. Too much impact. However, if there is a serious filling imbalance, for example, one cavity is not filled, but another cavity has produced serious overflow, white top, trapped gas and scorch. In this case, the injection molding machine is adjusted it becomes very difficult.
To solve the above problems, the following process adjustment methods can be considered.
First, use a first-class rapid, high-pressure injection. At this time, due to the impact of rapid and high pressure on the slow-filling cavity, the injection resistance is broken, and the filling speed is accelerated. The gap with the faster-injecting cavity will decrease with the acceleration of the injection speed, and the serious filling the problem of imbalance will therefore be improved.
However, the problem of unbalanced filling cannot be completely eliminated when it is serious, and if rapid high-pressure injection has been carried out all the time, the injection molded parts will definitely have more problems such as overflow. Therefore, when the fastest cavity is about to be filled, it should be filled with two slow and low pressure immediately. Because the injection of the first stage is faster, the melt temperature does not drop much, and it is feasible to switch to slow filling. Therefore, the slower filling cavity can finally fill the cavity. The faster filling cavity because of the speed and pressure It has been greatly reduced, and problems such as overflow and scorching will no longer occur.
This injection machine adjust technique requires that the second-stage slow starting point must be adjusted, not too early or too late. When adjusting the injection machine, you can first use the ‘mold transparency method’ to find a rough position, and then move the starting point back and forth to find this suitable position.
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