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General classification of molds: They can be divided into plastic molds and non-plastic molds:
(1) Non-plastic molds include: casting molds, forging molds, stamping molds, die-casting molds, etc.
A. Casting mold - faucet, cast iron platform
B. Forging mold - car body
C. Stamping mold - computer panel
D. Die-casting mold - super alloy, cylinder block
(2) Plastic mold
A. Injection molding mold - TV shell, keyboard button (more commonly used)
B. Blowing mold - beverage bottle
C. Compression molding mold - Bakelite switch, scientific porcelain bowls and plates
D. Transfer molding mold - integrated circuit products
E .Extrusion molding mold - glue tube, plastic bag
F.Thermoforming mold - transparent molding packaging shell
G.Rotational molding mold - soft plastic doll toy
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. Because of the different materials, appearances, specifications and uses of various products, molds are 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 the plastics industry and the continuous improvement of general and engineering plastics in strength and precision, the application scope of plastic products has also been expanding. For example, in many fields such as household appliances, instruments and meters, construction equipment, automobile industry, and daily hardware, the proportion of plastic products is increasing rapidly. A well-designed plastic part can often replace multiple traditional metal parts.
2. General definition of molds: In industrial production, various presses and special tools installed on the presses are used to make metal or non-metal materials into parts or products of the required shape through pressure. Such special tools are collectively called molds.
3. Injection molding process description: Molds are tools 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, and the molten plastic is injected into the molding cavity and cooled and shaped in the cavity. Then the upper and lower molds are separated, and the product is ejected from the mold cavity by the ejection system. Finally, the mold is closed for the next injection molding. The entire injection molding process is a cycle.
4. (1) On the mold line, it is demolded together with the product when the mold is opened. The design is simpler, easy to process, and the cost is lower, so more people use the large gate system.
(2) Fine gate mold: The runner and gate are not on the parting line, usually directly on the product, so it is necessary to design an additional set of gate parting lines. The design is more complicated and the processing is more difficult. Generally, the fine gate system should be selected according to the product requirements.
(3) Hot runner mold:
The structure of this type of mold is basically the same as that of the fine gate. The biggest difference is that the runner is in one or more hot runner plates and hot nozzles with constant temperature. There is no cold material demoulding. The runner and gate are directly on the product, so the runner does not need to be demoulded. This system is also called a no-gate system. It can save raw materials and is suitable for situations where raw materials are expensive and product requirements are high. It is difficult to design and process, and the mold cost is high.
