1.Setting requirements and scope of injection molding parameters
For example, the tolerance range of injection molding parameters is basically set to ± 15, and the range is set to ± 15 based on many years of experience. Actually, it is a bit general. It has not been considered whether the entire range can guarantee good quality, and whether it can guarantee good quality in this range. The standard setting is lacking.
Through the study of the parameters and performance of the injection molding machine and the physical properties of each material, and production verification, the tolerance range has been further narrowed so that the adjuster can quantify the reference range of the injection molding parameters to ensure the stability of the production process and product quality.
2.Control of injection mold temperature
The water temperature set on the mold temperature machine does not represent the mold temperature. For example, the set water temperature of the fixed mold and the movable mold is 85 ± 5 ° C. Although the set value is known, the measured temperature and controllable temperature of the mold cannot be effectively determined. How much, so that the plastic parts after molding may cause production instability.
In actual production, it is necessary to measure the actual temperature of the fixed mold and the movable mold, divide the mold at multiple points, measure the temperature at different temperature measurement points, and make a relationship diagram and table of water temperature and mold temperature. The relationship between the value and the measured mold temperature.
3.Relationship between injection molding temperature and resin temperature
When the equipment is abnormally heated, the resin temperature cannot be effectively controlled to rise or fall, which may cause: injection molding temperature failure, material degradation, and product strength impact. Use a resin temperature measuring instrument to measure and compare with the set temperature during molding. And add to the relevant program files.
It has been verified that the temperature of the molten plastic particles ejected from the nozzle is generally 5-20 ° C lower than the temperature set by the injection nozzle of the injection molding machine (required to stop the machine to measure the temperature of the resin injected during injection)