The injection molding process needs to control the temperature of the barrel, nozzle temperature and mold temperature. The first two temperatures mainly affect the plasticization and flow of plastics, while the latter temperature mainly affects the flow and cooling of plastics.
The application range of plastic parts is getting wider and wider, from simple tableware, kitchen utensils to complex mechanical parts , electronic product shells, etc. Plastic parts are used, but for plastic parts with high precision requirements such as electronic product shells, injection molding processing At the time of injection molding, the accuracy requirements must be paid attention to from the beginning of mold manufacturing.
The common holes in the processing of injection molded parts are through holes, blind holes, shaped holes (holes with complex shapes) and threaded holes. These holes should be set in places where the strength of the plastic parts is not weakened. Between the holes and the holes, the holes and There should be sufficient distance between the side walls, and the relationship between the two holes of the thermosetting injection molded parts and the thermoplastic injection molded parts and between the holes and the side walls can be found in the relevant industry tables.
Too large wall thickness in the processing of plastic parts not only wastes raw materials, but also increases the molding time for thermosetting plastic molding, and it is easy to cause incomplete curing.
The design of plastic parts includes considerations of aesthetics, structure, heating, manufacturing, etc. The design of the assembly method can be used to reduce parts, determine the tolerance of critical dimensions and ensure the assembly economy of the finished product.
The cae technology can be used to make analog analysis of the entire injection molding process on the computer before the mold is processed to accurately predict the filling, holding pressure, and cooling of the melt. As well as the stress distribution, molecular and fiber orientation distribution, and product shrinkage in the product And warpage and deformation, so that the designer can find the problem as soon as possible, modify the parts and mold design in time, instead of waiting for the mold to be repaired after the trial.
The temperature of the center layer of the thickest part of the wall of the plastic injection-molded part, the time required to cool below the heat deformation temperature of the plastic; the time standard for opening the mold to take out the part, usually the part has been fully cured, with certain strength and rigid Subject to deformation and cracking during ejection.
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