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The molding production cycle of plastic injection par […]
The molding production cycle of plastic injection parts is short, there is almost no post-processing, and plastic products with complex shapes and precise dimensions can be molded at one time. It has high production efficiency, is easy to realize automatic operation, and is suitable for molding production of external packaging parts such as household appliances and office automation equipment.
The specific operation steps for the production of this plastic injection part are mold clamping, material injection, pressure holding, cool (this time, heating, plasticizing and metering of the next injection material in the barrel), mold opening, and taking out Product, for the next injection operation. A female mold with a variable cavity composed of a female mold component and a female mold combination clamping plate, which is composed of a convex mold combination substrate, a convex mold component, a convex mold combination clamping plate, a cavity cutting component and a side cutting combination plate. The punch of the modified core.
The existence of pressure is to overcome the resistance of the flow of the melt, or conversely, the resistance of the flow needs to be offset by the pressure in the injection molding machine to ensure the smooth filling process. It is of great significance to improve the surface quality of products and reduce dimensional tolerances. Near the end of the injection molding process, the screw stopped rotating and only advanced forward, at this time the injection molding entered the pressure holding stage.
However, at the same time, the screw retraction time is extended, the length of the plastic fiber is reduced, and the pressure of the injection molding machine is increased, so the back pressure should be lower, generally not more than 20% of the injection pressure. The high-temperature mold can provide better surface appearance, the residual pressure will be smaller, and it will be easier to fill up for thinner or longer molded products. The low mold temperature can shorten the molding cycle.