The working principle of injection mold

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The working principle of injection mold

To put it simply, the molds and tools needed to produce products are obtained through various methods. With this mold, the same type of products can be produced in batches, which is an important symbol of industrial development. Let me tell you about the working principle of the injection mold!

The injection mold 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, the molten plastic is injected into the molding cavity, and is cooled and shaped in the cavity, then the upper and lower molds are separated, the product is ejected from the cavity and left the mold through the ejection system, and the mold is finally closed For the next injection, the entire injection molding process is carried out cyclically.

Injection molding is the most commonly used method in plastic processing. This method is suitable for all thermoplastics and some thermosetting plastics. The number of plastic products produced is unmatched by other molding methods. As one of the main tools of injection molding processing, the injection mold is in terms of quality accuracy, manufacturing cycle and injection molding process. The level of production efficiency, etc. directly affects the quality, output, cost, and product update of products, and also determines the ability and speed of enterprises to respond in market competition.

The injection mold design is composed of several steel plates with various parts. It is basically divided into: forming device, positioning device, fixing device, cooling system, constant temperature system, runner system, ejection system, and different types of casting systems. The plastic mold design is divided into three categories (1) Large nozzle injection mold design: runners and gates are on the parting line, and the product is released together with the product when the mold is opened. The design is the simplest, easy to process, and low cost, so More people use large nozzle systems for operations. (2) Design of the injection mold for the fine nozzle: runners and gates are not on the parting line, but are usually directly on the product. Therefore, it is necessary to design an additional set of nozzle parting lines. The design is more complicated and the processing is more difficult. Generally, it depends on the product requirements. Instead, use the fine nozzle system. (3) Hot runner injection mold design: The structure of this type of mold is roughly the same as the nozzle. 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. And the gate is directly on the product, so the runner does not need to be demolded. This system is also called a nozzleless system, which can save raw materials. It is suitable for situations where the raw materials are more expensive and the product requirements are high. The design and processing are difficult, and the mold cost is relatively high.

With the rapid development of the plastic and plastic mold processing and molding industry, plastic molds came into being at this time. Now the quality requirements for plastic mold processing are getting higher and higher, which provides a huge impetus to the development of the plastic mold processing industry. 

The structural adjustment of the plastic mold industry is constantly accelerating, and the number and capabilities of market-oriented professional plastic mold manufacturers are also growing very fast. According to the analysis of the production, sales, market conditions, industry structure, products and import and export of the plastic mold design and manufacturing industry, referring to the development trend of plastic mold related industries, the future development space of my country's plastic mold design and manufacturing industry is very broad .