Molds are process equipment for the production of industrial products, mainly used in manufacturing. It is matched with stamping, forging, casting and forming machinery, and forming machinery for forming and processing non-metallic materials such as plastics, rubber, and ceramics, and is used as a forming tool. Molds are precision mechanical products, mainly composed of mechanical parts and mechanisms, including forming working parts (punch and die), guide parts (guide post and guide sleeve), support parts (die base) and positioning parts, etc., as well as feeding mechanism, core pulling mechanism, push (top) material (piece) mechanism, testing and safety mechanism, etc.
In order to improve the quality, performance, precision and production efficiency of household plastic molds and shorten the mold manufacturing cycle, the molds are mostly marked with parts and components, so the molds are products with a high degree of standardization. In a pair of small and medium punching dies or plastic injection moulds, the standard parts can reach 90%, and the man-hour saving rate can reach 25% to 45%.
Injection mold is also called injection mold. First, the granular or powdery plastic raw materials are added to the barrel of the injection machine, heated and melted into a viscous flow state, and then driven by the screw or plunger, the molten plastic is injected at a certain flow rate through the nozzle at the front of the barrel to close. In the mold cavity, after a certain pressure holding, the plastic is cooled and hardened in the mold, and then the mold is opened, and the molded plastic part is released from the mold.
Compression mold is also called compression mold. The preheated plastic raw material is directly placed in the heated mold cavity (feeding chamber), and the punch works downward. Under the action of heat and pressure, the plastic is in a molten state and fills the cavity, and then solidifies and forms. Compression molds in the category of plastic molds are mostly used for the molding of thermosetting plastic parts, but this method has a long molding cycle and low production efficiency.
Injection molding is also known as transfer molding. The charging chamber of the injection mold is connected with the cavity by the gating system. First, the preheated plastic raw material is put into the preheated charging chamber, and then pressure is applied to the plastic raw material in the charging chamber through the pressure column. The plastic is melted under high temperature and high pressure and enters the cavity through the mold casting system, and finally the chemical cross-linking reaction occurs and gradually hardens stereotypes. Injection home plastic molds are mainly used for the molding of thermosetting plastic parts.
The extrusion die is often called the extruder head. Extrusion molding is to use the screw in the extruder barrel to rotate and pressurize to continuously extrude the plasticized material in the molten state from the barrel, and form it through a die with a specific cross-sectional shape. The extruded plastic parts are pulled out evenly by the pulling device, and at the same time, they are cooled and shaped to obtain a continuous profile with a consistent cross-sectional shape.
The pneumatic molding die in the type of plastic mold refers to a mold that uses gas as a power to form plastic parts. Including hollow blow molding molds, vacuum forming molds and compressed air forming molds, etc.