Injection mold factory Plastic mold System composition - detailed explanation of six systems of plastic mold

Six systems of plastic mold

The functional structure of the plastic mold system is mainly composed of six systems: gating system, temperature regulating system, molding parts system, exhaust system, guiding system, ejection system, etc, Injection mould In the factory, the gating system and molding parts are the parts that are in direct contact with the plastic and change with the plastic and products. They are the parts in the plastic mold that are complex and change greatly. The injection mold factory requires high processing smoothness and precision.

1. Gating system:

The gating system refers to the runner part before the plastic enters the mold cavity from the nozzle, including the main runner, cold feed cavity, shunt channel, gate, etc.

2. Formed part system:

The forming part system refers to the combination of various parts forming the shape of products, including moving die, fixed die, cavity (female die), core (male die), forming rod, etc. The core forms the inner surface of the product, and the cavity (female die) forms the outer surface shape of the product. After the mold is closed, the core and cavity form the cavity of the mold. According to the process and manufacturing requirements, sometimes the core and die are combined by several blocks, sometimes they are made into a whole, and only the parts that are easy to damage and difficult to process are inserted.

3. Temperature regulating system:

The temperature regulating system is to meet the requirements of the injection process on the mold temperature. A temperature regulating system is required to regulate the mold temperature. The injection mold factory mainly designs a cooling system to cool the injection mold for thermoplastics (it can also heat the mold). The common method of mold cooling is to set cooling water channel in the mold, and use circulating cooling water to take away the heat of the mold; In addition to using cooling water to pass hot water or hot oil for mold heating, electric heating elements can also be installed inside and around the mold.

4. Exhaust system:

The exhaust system is set up to exhaust the air in the cavity during injection molding and the gas generated by plastic melting to the outside of the mold. When the exhaust is not smooth, the product surface will form air marks (air lines), charring and other defects; The exhaust system of the plastic mold is usually a groove shaped air outlet opened in the mold to exhaust the air in the original cavity and the gas brought in by the molten material.

When molten material is injected into the mold cavity, the air originally stored in the mold cavity and the gas brought in by the melt must be discharged out of the mold through the exhaust port at the end of the material flow, otherwise the products will have pores, poor connection, insufficient mold filling, or even the accumulated air will burn the products due to the high temperature caused by compression. In general, the vent hole can be located at the end of the molten material flow in the mold cavity or on the parting surface of the mold.

The latter is to set a shallow groove with a depth of 0.03-0.2mm and a width of 1.5-6mm at one side of the female die. During injection, there will not be a lot of molten materials oozing out of the vent hole, because the molten materials will cool and solidify there and block the channel. The opening position of the exhaust port shall not face the operator to prevent accidental ejection of molten materials from injuring people. In addition, the matching clearance between the ejector rod and the ejector hole, the matching clearance between the ejector block and the template and the core can also be used to exhaust.

5. Guidance system:

The guiding system is set up to ensure that the moving die and the fixed die can be accurately aligned when closing the mold. The guiding parts must be set in the mold. In the injection mold, four groups of guide pillars and guide sleeves are usually used to form the guide parts, and sometimes it is necessary to set the inner and outer conical surfaces that coincide with each other on the moving mold and the fixed mold to assist in positioning.

6. Ejection system:

Ejection system generally consists of ejector pin, front and rear ejector pin plates, ejector pin guide rod, ejector pin return spring, ejector pin plate locking screw, etc. When the product is molded and cooled in the mold, the front and rear molds of the mold are separated and opened, and the plastic product and its condensate in the runner are pushed or pulled out of the mold cavity and runner position by the ejector mechanism - ejector pin under the push of the ejector pin of the injection molding machine, so as to carry out the next injection molding work cycle.

After reading the above six systems of plastic mold system, I believe you have explained the six systems of plastic mold in detail.