Commonly used plastic parts in automobiles include filter systems, car interior parts, seats, air conditioning systems, etc. Many of these parts use car plastic injection mould, and car plastic injection mould has many classifications, which are processed according to plastic. Different methods can be divided into the injection mold, compression mold, transfer mold, and extrusion mold.
1. Injection mold
Injection mold is also called injection mold. The molding process of this mold is characterized by placing the plastic material in the heating barrel of the injection machine. The plastic is heated and melted and driven by the screw or plunger of the injection machine, it enters the mold cavity through the pouring system of the nozzle and the mold. Since the heating and pressing device can function in stages, injection molding can not only mold plastic parts with complex shapes but also has high production efficiency and good quality. Therefore, injection molding occupies a large proportion of the molding of plastic parts, and injection molds account for more than half of plastic molding molds. Injection machines are mainly used for the molding of thermoplastics, and in recent years, they have also been gradually used for the molding of thermosetting plastics.
2. Car plastic injection mould injection molding process
Under normal circumstances, car parts mould classification: two-plate mold, three-plate mold, hot runner.
Features and use occasions:
Two-plate mold: the most commonly used, three-plate mold: the surface of the finished product is needled into the glue or the glue pad is eccentric, hot runner: no runner, which can reduce waste and increase injection pressure.
Mold processing methods mainly include forging, milling, drilling, grinding, EDM, wire cutting, etc.
EDM is a special machining method that uses the electro-erosion effect generated by the pulse discharge between the two poles immersed in the working fluid to erode conductive materials, also known as electric discharge machining or electro-erosion machining.
The basic principle of wire cutting is to use a moving small metal wire (copper wire or molybdenum wire) as an electrode to perform pulse spark discharge on the workpiece and feed the control system through a computer. With a certain concentration of water-based emulsion for cooling and chip removal, the workpiece can be processed graphically.
1. CNC milling machines are generally used for rough machining of molds and surfaces with low appearance requirements, such as the back of the product - the male mold surface, etc.
2. EDM is generally used to process curved surfaces and reinforcing ribs that are difficult to be processed by CNC milling machines.
3. Wire cutting is generally used to process oblique pins that form hooks, through holes with irregular shapes, and workpieces with narrow slits.