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How to solve the leakage of injection molding machine?

2020-10-22

1. It is proposed that the molds are equipped with positioning rings. Although there is no positioning ring, it will save its cost, but there is no positioning ring, which will not only cause hidden safety risks of glue leakage, but also lengthen the time of changing the mold when changing the mold. The cost of destroying the electric heating ring can save the expenditure of the positioning ring;


2. Immediately check whether the tightening screws of the turret are loosened and tightened; the corresponding verification method: before production, the hand-held tractor is held on the cylindrical shooting platform. When encountering the mold, whether the tactile nozzle and the mold gate sleeve are in the same parallelism You can also use a plastic paper pad on the mold glue mouth. After the nozzle meets the mold, withdraw it to see if the paper hole is consistent with the nozzle mouth;


3. Temporary precautions due to damage to the mold sprue bushing and nozzle mouth: Use soft metal materials such as copper pads on the mold sprue bushing. After opening the hole, put the copper sheet again on the mold mouth cover according to the previously held part, and use the nozzle to resist the production; permanent precautions: re-grind the relative gate sleeve or nozzle to make the gate sleeve The R angle of both the nozzle on the turret is leveled and touched to produce;


The requirements of the injection mold when designing the cavity arrangement

The design of injection molded parts generally requires the design of the number and arrangement of mold cavities. The design of the mold cavity cannot simply apply the dimensional tolerance of the mechanical parts. The dimensional accuracy of the plastic parts will be affected by many factors such as the structure of the plastic parts, the plastic material and the shrinkage rate of the plastic parts during production. Therefore, the injection mold cavity The ranking must follow certain principles in order to meet the requirements of mold manufacturing.


The general requirements of the cavity of the injection mold are as follows:


a. The flow channel is as short as possible: to prevent the pouring material of the pouring system, it can also save the manufacturing cost of steel materials and molds, and improve the pass rate of injection products.


b. Pressure balance: Make the combined force of the injection mold during injection and the clamping force of the injection molding machine on the same straight line, to avoid the uneven molecular orientation caused by unbalanced flow, causing inconsistent shrinkage.


c. Temperature equilibrium: Make the temperature of the injection mold cavity roughly equal, and ensure that the shrinkage of the plastic parts of each cavity is equal.


d. Feeding balance: For a mold with multiple cavities, the same plastic part should be fed from the same position to ensure the interchangeability of the plastic parts; the size and length of the runner and gate should be compatible with the size of the plastic parts, try to Ensure that each cavity is fed at the same time and fill each cavity at the same time.



4. Leakage caused by mismatching of the R angle of the sprue bushing or nozzle. Remove the sprue bushing or nozzle to keep the R angle of the sprue bushing and the nozzle consistent.


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