Injection mold is a tool for producing plastic products; it is also a tool for giving plastic products a complete structure and precise dimensions.
Injection molds are divided into thermosetting plastic molds and thermoplastic molds according to the molding characteristics; according to the molding process, they are divided into transfer molds, blow molds, casting molds, thermoforming molds, hot compression molds (compression molds), injection molds, etc. Among them, hot press molds can be divided into three types: overflow type, semi-overflow type, and non-overflow type. Injection molds can be divided into cold runner molds and hot runner molds by gating system; according to the way of loading and unloading It can be divided into two types: mobile type and fixed type.
The material of the mold directly affects the cooling effect. Commonly used mold materials include P20 steel, H13 steel, P6 steel, S7 steel, beryllium copper alloy, aluminum, 420 stainless steel, and 414 stainless steel.
Mold manufacturing uses two main methods: electrical discharge machining and machining. Traditional methods have used traditional methods to manufacture molds. With the development of science and technology, CNC machining has become the main method, enabling more complex molds and mold details to be manufactured more accurately in a shorter time than traditional methods.
A space with the same shape as the molded product is left in the mold to accommodate the molten plastic. This space is called a cavity.
When there is a need for biting, it is recommended that the demolding angle must be larger than the general situation. The demolding angle given by it should preferably be more than 2 degrees, but the demolding angle should not be greater than 5 degrees.
If you encounter a finished product that is not allowed to have a demolding taper, it must be treated with a barb, but the price is inevitably expensive and should be avoided as much as possible.
During the molding operation, due to the deformation of the mold, the shape and dimensional accuracy of the molded product will naturally change. In order to prevent the mold from deforming and breaking due to pressure, it is necessary to calculate the injection molding according to the structure of the cavity receiving frame and the strength of the bearing plate. pressure.
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