The design of the gate shape, size and position of the plastic injection mold depends on the nature of the plastic, the size and structure of the product. Generally, the cross-sectional shape of the gate is rectangular or circular, and the cross-sectional area should be small and the length should be short. This is not only based on the above-mentioned effects, but also because it is easier to make a small gate larger, and it is difficult to shrink a large gate.

The gate position of the plastic injection mold should generally be selected where the product is thick without affecting the appearance. The design of the gate size should take into account the nature of the plastic melt. Cavity It is the space for molding plastic products in the mold. The components used to form the cavity are collectively called shaped parts. Each molded part often has a special name. The forming parts constituting the outer shape of the product are called concave molds (also called female molds), which constitute the inner shape of the product.

When designing a molded part, the overall structure of the cavity must first be determined according to the properties of the plastic, the geometry of the product, dimensional tolerances and use requirements. The second is to choose the parting surface, the position of the gate and the exhaust hole, and the demolding method according to the determined structure. Design each part according to the size of the control product and determine the combination mode between each part. Plastic melt has a high pressure when it enters the cavity, so the molded parts must be reasonably selected and checked for strength and stiffness.

In order to meet the temperature requirements of the injection molding process for plastic injection molds, a temperature adjustment system is required to adjust the mold temperature. For thermoplastic injection molds, the cooling system is mainly designed to cool the mold. The common method for mold cooling is to set up cooling water channels in the mold, and use the circulating cooling water to take away the heat from the mold. In addition to using the cooling water channel for hot water or steam, the mold can also be installed with electricity inside and around the mold. Heating element.

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