The design of injection molded parts generally involves designing the number and arrangement of mold cavities. The design of mold cavities cannot simply apply the dimensional tolerances of mechanical parts. The dimensional accuracy of plastic parts is influenced by many factors such as plastic structure, plastic materials, and the shrinkage rate of plastic parts during production. Therefore, the positioning of injection mold cavities must follow certain principles in order to meet the requirements of mold manufacturing.
- The runner should be as short as possible: to prevent solidification in the pouring system, it can also save steel and mold manufacturing costs, and improve the qualification rate of injection molded products.
- Pressure balance: Make the combined force of the injection mold during injection aligned with the locking force of the injection molding machine, to avoid uneven flow that leads to irregular molecular orientation and inconsistent shrinkage rate.
- Temperature balance: Make the temperature of the injection mold cavity roughly equal, ensuring that the shrinkage rate of the plastic parts in each cavity is equal.
- Feeding balance: for the the first mock examination with multiple cavities, the same plastic part should be fed from the same location to ensure the interchangeability of plastic parts; The size and length of the runner and gate should be suitable for the size of the plastic part, ensuring that all cavities are fed simultaneously and evenly filled.
Reasonably designing injection molded parts to ensure the quality of the molded parts is a fundamental principle for improving the production efficiency of injection molds.
