Injection Molding Processing Inverter Plastic Shell Processing Air Conditioning Shell Opening Mold Inverter Hanging Machine Shell Injection Molding
Plastic mold system composition-detailed explanation of the six systems of plastic mold
Six systems of plastic molds (Asian Fluid Network)
The functional structure of the plastic mold system is mainly composed of six systems: pouring system, temperature control system, molding parts system, exhaust system, guiding system, ejection system, etc. The pouring system and molding parts are the parts in direct contact with the plastic, and follow The change of plastics and products is the part of the mold that is complex and changes a lot, requiring high processing finish and precision.
1. Pouring system:
The gating system refers to the part of the runner before the plastic enters the cavity from the nozzle, including the main runner, cold material cavity, runner and gate, etc.
2. Forming parts system:
The forming part system refers to the combination of various parts that constitute the shape of the product, including the movable mold, the fixed mold and the cavity (concave mold), the core (punch mold), and the molding rod. The core forms the inner surface of the product, and the cavity (concave mold) forms the outer surface shape of the product. After the mold is closed, the core and the cavity constitute the cavity of the mold. According to process and manufacturing requirements, sometimes the core and die are combined by several pieces, and sometimes they are made as a whole, and inserts are only used in the parts that are easy to damage and difficult to process.
3. Temperature control system:
The temperature adjustment system is to meet the mold temperature requirements of the injection process, and a temperature adjustment system is required to adjust the temperature of the mold. For injection molds for thermoplastics, the cooling system is mainly designed to cool the mold (the mold can also be heated). The common method of mold cooling is to open a cooling water channel in the mold, and use the circulating cooling water to take away the heat of the mold; the heating of the mold can use the cooling water to pass hot water or hot oil, and it can also be installed inside and around the mold. Electric heating element.
4. Exhaust system:
The exhaust system is set up to remove the air in the cavity and the gas generated by the melting of the plastic during the injection molding process to the outside of the mold. When the exhaust is not smooth, the surface of the product will form air marks (air lines), burnt and other defects; plastic The exhaust system of the mold is usually a slot-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 the melt is injected into the cavity, the air originally stored in the 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 product will have pores, poor connection, Dissatisfaction with the filling of the mold, and even the accumulated air, which burns the product due to the high temperature generated by the compression. Under normal circumstances, the vent can be located either at the end of the melt flow in the cavity or on the parting surface of the mold.
The latter is a shallow groove with a depth of 0.03-0.2mm and a width of 1.5-6mm on one side of the cavity. During injection, there will not be a lot of molten material in the vent hole, because the molten material will cool and solidify at the place and block the channel. The opening position of the exhaust port should not be facing the operator to prevent accidental spraying of molten material and hurting people. In addition, the matching gap between the ejector rod and the ejector hole, the matching gap between the ejector block and the stripper plate and the core can also be used for exhaust.
5. Guiding system:
The guide system is set up to ensure that the movable mold and the fixed mold can be accurately centered when the mold is closed, and a guide component must be installed in the mold. In the injection mold, four sets of guide posts and guide sleeves are usually used to form the guide parts. Sometimes, it is necessary to set mutually coincident inner and outer cones on the movable mold and the fixed mold to assist positioning.
6. Ejection system:
The ejection system generally includes: thimble, front and rear thimble plates, thimble guide rod, thimble return spring, thimble plate locking screw and other parts. When the product is formed and cooled in the mold, the front and rear molds of the mold are separated and opened, and the ejection mechanism-the ejector pin is pushed by the ejector pin of the injection molding machine to push the plastic product and the aggregate in the runner out or pull out the mold cavity and runner position , In order to proceed to the next injection molding work cycle.
After reading the six major systems of the plastic mold system above, I believe you have already explained the six major systems of the plastic mold in detail.