The application of plastic parts is becoming more and more widespread, from simple tableware, kitchenware to complex mechanical parts, electronic products shells, etc. are used to plastic parts, but for electronic products shells and other plastic parts with high precision requirements, in the from the beginning of the mold manufacturing
should pay attention to its precision requirements.
And in the plastic injection molding processing
stage of the precision of which factors to determine? How can we improve the precision of thin-walled injection molded parts
1. off mold pressure: in principle, it should be greater than the total pressure of plastic injection into the mold, in order not to get burrs as a benchmark.
2. pressure and speed have part of the same relationship between the purpose of the role in the mold are to make the raw materials into the mold can be uniform, thorough, the right amount of full of all corners. Too low will be short shot, shrinkage, too high hairy head, too full, sticky mold, scorching, easy to damage the mold and high internal stress undesirable phenomena.
3. speed is to decide the raw material in the mold sprue and the finished product in the condition, fast have burr, overfull, scorched, slow will appear short shot, shrinkage, combined with poor easy to break.
4. Temperature is different from raw materials, the temperature varies, too low melt glue is not transparent and leads to uneven color, the finished product of the internal stress increases. Because the temperature is too low pressure is too high, may cause the screw fracture, too high, the product has a burr, but also due to cooling and temperature differences, causing shrinkage. The raw material will be decomposed, yellow, discolored, easy to break. The cooling time becomes longer and the gas is not easily discharged.