A combined plastic mold for pressure molding, extrusion molding, injection molding, blow molding, and low foam molding, mainly comprising a concave mold with a variable cavity composed of a concave mold composite substrate, a concave mold assembly, and a concave mold composite clamp, and a convex mold with a variable core composed of a convex mold composite substrate, a convex mold assembly, a convex mold composite clamp, a cavity cutout assembly, and a side cut composite plate. Coordinated changes in mold convex, concave, and auxiliary molding systems. Can process a series of plastic parts with different shapes and sizes. The plastic processing industry is equipped with plastic molding machines to give plastic products a complete configuration and precise size of tools. Due to the wide variety of plastic varieties and processing methods, and the complexity and simplicity of the structures of plastic molding machines and plastic products, the types and structures of plastic molds are also diverse.

With the rapid development of the plastic industry and the continuous improvement of general and engineering plastics in terms of strength, the application range of plastic products is also expanding, and the consumption of plastic products is also increasing.

A plastic mold is a tool for producing plastic products. It consists of several sets of parts, which have a molding cavity inside. During injection molding, the mold is clamped on the injection molding machine, and molten plastic is injected into the mold cavity, cooled and shaped in the cavity. Then, the upper and lower molds are separated, and the product is ejected from the mold cavity through the ejection system. Finally, the mold is closed for the next injection molding. The entire injection process is cyclic.

Generally, a plastic mold consists of a moving mold and a fixed mold. The moving mold is installed on the movable template of the injection molding machine, and the fixed mold is installed on the fixed template of the injection molding machine. During injection molding, the movable mold and the fixed mold are closed to form a pouring system and cavity, and during mold opening, the movable mold and the fixed mold are separated to take out the plastic product.

Although the structure of the mold may vary greatly due to the variety and performance of plastics, the shape and structure of plastic products, and the type of injection machine, the basic structure is consistent. The mold is mainly composed of a pouring system, a temperature regulating system, molding parts, and structural parts. The gating system and molding parts are the parts that are in direct contact with plastics and vary with plastics and products. They are the most complex and most variable parts in plastic molds, requiring the highest machining finish and accuracy.

The pouring system refers to the part of the flow path before the plastic enters the mold cavity from the nozzle, including the main flow path, the cold cavity, the shunt path, and the gate. Formed parts refer to various parts that form the shape of a product, including moving molds, fixed molds, and cavities, cores, molding rods, and exhaust ports.

Driven by high technology and the application demand of pillar industries, China's plastic molds have formed a huge industrial chain. From the upstream raw and auxiliary materials industry and processing, testing equipment to the downstream application industries of machinery, automobiles, motorcycles, household appliances, electronic communications, building materials, and other major industries, the development of plastic molds is full of vitality.

With the rapid development of automobiles, home appliances, electronic communications, and various building materials in China.