Mold is a kind of process equipment that is widely used in the middle stage of industrial production. The development of modern industry and the improvement of the technical level are inseparable from molds. According to statistics, 75% of the rough machining of industrial parts and 50% of the finishing are completed by mold forming. According to its type, it can be divided into: cold stamping mold, injection mold, die-casting mold, rubber mold, etc.

1.1. Scope of application: Injection molds are suitable for thermoplastics such as ABS, PP, PC, POM, etc., while thermosetting plastics such as phenolic plastics, epoxy plastics, etc. use rubber molds;

1.2. Classification of injection molding machine molds: according to structure: two-platen mold, three-platen mold according to nozzle: large nozzle, point nozzle, hot water nozzle

1.3. Mold structure of injection molding machine

A. Molding parts: that is what we usually call the front and rear mold CORE, and it is also the part most closely related to the product;

B. Pouring system: the flow channel where molten plastic is led from the nozzle to the cavity, which can be divided into: main channel, runner, gate, cold slug well, etc.;

C. Guide system: determine the relative position of the front and rear molds when closing the mold. Generally, there are guide posts and guide sleeves. If necessary, the ejection part also needs guide posts and guide sleeves to locate;

D. Mold release structure: It is the device that ejects the rubber parts from the mold. The commonly used ones are thimble, top plate, cylinder, etc.;

E. Temperature adjustment system: In order to meet the mold temperature requirements of the injection molding process, cooling water channels are added to the front and rear molds;

F. Lateral parting and lateral core-pulling: When the plastic part has an undercut structure that is inconsistent with the demolding direction, the row position must be used. Common forms: sliders, inclined tops, core-pulling, etc.;

G. Exhaust structure: There are two common exhaust forms: exhaust grooves and gaps between formed parts.

In order to remove the air in the cavity and the gas generated during the molding process during the injection molding process, exhaust grooves are often provided on the parting surface. The principle of setting the exhaust groove is that the exhaust groove should be as large as possible without affecting the overflow and the front. The inserts, thimbles, and inserts use the gaps in the molded parts to exhaust air.

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