A combined plastic mold for compression molding, extrusion molding, injection molding, blow molding and low foaming molding mainly comprises a female die with a variable cavity composed of a female die combined substrate, a female die component and a female die combined splint, and a male die with a variable core composed of a male die combined substrate, a male die component, a male die combined splint, a cavity cutting component and a side section combined plate. Coordinated change of punch, die and auxiliary forming system of stamping die. Can process a series of plastic parts with different shapes and sizes.

All kinds of tools and products used in our daily production and life, from the base of the machine tool and the shell of the machine body to the shell of an embryonic head screw, buttons and various household appliances, are closely related to the mold. The shape of the mold determines the appearance of these products, and the processing quality and precision of the mold also determine the quality of these products. Due to the different materials, appearances, specifications and uses of various products, molds can be divided into non-plastic molds such as casting molds, forging molds, die-casting molds, stamping molds and plastic molds.

1. In recent years, with the rapid development of plastic industry, the strength and precision of general-purpose plastics and engineering plastics have been continuously improved, and the application scope of plastic products has been constantly expanded, such as household appliances, instruments, construction equipment, automobile industry, daily hardware and many other fields, and the proportion of plastic products has increased rapidly. A reasonably designed plastic part can often replace many traditional metal parts. The plasticizing trend of industrial products and daily products is on the rise.

2. General definition of mold: In industrial production, metal or nonmetal materials are made into parts or products with required shapes by various presses and special tools installed on the presses. This special tool is collectively called the mold.

3. Description of injection molding process: Mold is a tool for producing plastic products. It is composed of several groups of parts, and there is a molding cavity in this combination. During injection molding, the mold is clamped on the injection molding machine, molten plastic is injected into the cavity of the molding mold, cooled and molded in the cavity, then the upper and lower molds are separated, and the product is ejected from the mold cavity through the ejection system, and finally the mold is closed for the next injection molding. The whole injection process is cyclic.

4. On the (1) mold line, the mold is demoulded together with the product when the mold is opened. The design is the simplest, the processing is easy and the cost is low, so more people use the large nozzle system for operation. (2) Nozzle mold: The runner and gate are not on the parting line, but generally directly on the product. Therefore, it is necessary to design an additional nozzle parting line, which is complicated in design and difficult to process. In general, the nozzle system should be selected according to the product requirements. (3) Hot runner mold: The structure of this mold is basically the same as that of the nozzle, but the biggest difference is that the runner is located in.

One or more hot runner plates and heat pumps with constant temperature do not need to be demoulded because the runner and gate are directly on the product, so the runner does not need to be demoulded. This kind of system, also known as nozzle-less system, can save raw materials and is suitable for situations where raw materials are expensive and products are highly demanded. It is difficult to design and process, and the die cost is high.