In the process of plastic mold processing, injection molding size, material temperature, mold temperature control, pressure and exhaust control all need to be in place to process plastic mold products that meet the requirements.
Supplementary shaping control of the size of injection molded parts
Due to the difference in shape and size, some plastic parts will deform and warp in different situations with the changes in temperature and pressure loss after demolding. At this time, some auxiliary tooling fixtures can be adjusted to quickly and promptly after the molded part is released Take remedial measures and get better correction and adjustment effects after it is naturally cooled and set. If strict management is ensured throughout the injection molding process, the size of the injection molded parts will be ideally controlled.
Control of material temperature and mold temperature
Different grades of plastics have different temperature requirements, and the poor flowability of plastic materials and the use of more than two types of mixtures will have different situations. Plastic materials should be controlled within the optimal flow value range. These are usually easy to do, but The control of the mold temperature is more complicated. Different geometric shapes, sizes and wall thickness ratios of the shaped parts have certain requirements on the cooling system. The mold temperature largely controls the cooling time, so try to keep the mold at The allowable low temperature state is conducive to shorten the injection cycle and improve production efficiency. When the mold temperature changes, the shrinkage rate will also change, the mold temperature will remain stable, and the dimensional accuracy will be stable, thereby preventing deformation of the molded part, poor gloss, Defects such as cooling spots keep the physical properties of the plastic in the best condition. Of course, there is a debugging process, especially the multi-cavity molding is more complicated.
Pressure and exhaust adjustment control
The air in the cavity formed by the mold cavity and the core and the gas generated by the plastic must be discharged from the mold through the exhaust groove. If the exhaust is not smooth, there will be insufficient filling, welding marks or burns. These three forms Defects sometimes appear in the same place occasionally. When thick walls exist around the wall of the molded part, insufficient filling will occur when the mold temperature is too low, and burns will occur when the mold temperature is too high, usually in the burned part Welding marks will appear at the same time, and the exhaust groove will often be ignored.