Automotive Plastic Components Design Structure

　　  The bumper mold adopts an internal fractal structure design. Compared with the traditional outer fractal structure design, the inner fractal design has higher requirements on the mold structure and mold strength and is more complicated. Correspondingly, the bumper mold design concept produced by the inner fractal structure mold is more advanced.

　　  Automobile tire mold classification

　　  1: Active mold, composed of pattern ring, mold sleeve, upper and lower side plates.

　　  The movable mold distinguishes the conical surface guided movable mold and the inclined plane guided movable mold

　　  2: Two halves of the mold, composed of an upper mold and a lower mold.

　　  Automobile tire mold processing technology

　　  Take the active mold as an example

　　  1: Cast or forge the blank according to the tire mold diagram, and then rough the blank and heat treatment. Tire mold blanks should be annealed and should be laid flat during annealing to avoid excessive deformation.

　　  2: Punch the lifting holes according to the drawing, and then process the outer diameter and height of the pattern ring according to the semi-finished turning drawing. Use the semi-finished turning program to turn the inner cavity of the pattern ring, and check the semi-finished turning model after turning.

　　  3: Use the processed tire mold pattern electrode to shape the inner pattern of the pattern ring by EDM, and use the model to test.

　　  4: Divide the pattern ring into several parts according to the manufacturer's requirements, draw the marking lines respectively, and put them in the tooling to punch the back waist hole and tap the thread.

　　  5: According to the equal parts divided in process 8, align the scribe line and cut.

　　  6: The cut pattern blocks are polished, corners, roots, and vent holes are drilled according to the requirements of the drawings.

　　  7: Sandblasting uniformly inside the pattern block cavity, requiring the same color.

　　  8: Combine the pattern ring, mold sleeve, upper and lower side plates to complete the tire mold.

　　  There are many ways to classify plastic molds. According to the different molding methods of automotive plastic components, they can be divided into the following categories:

　　  Injection mold is also called injection mold. The molding process feature of this mold is that the plastic raw material is placed in the heating barrel of the injection machine. The plastic is melted by heat, driven by the screw or plunger of the injection machine, enters the mold cavity through the nozzle and the pouring system of the mold, and the plastic is formed by heat preservation, pressure retention, and cooling in the mold cavity. Since the heating and pressurizing 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 in 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 have gradually been used for the molding of thermoset plastics.

　　  Compression mode

　　  Compression mold is also called compression mold or compression mold. The molding process of this mold is characterized by adding plastic raw materials directly into the open mold cavity and then closing the mold. After the plastic is in a molten state under the action of heat and pressure, the cavity is filled with pressure. At this time, the molecular structure of the plastic has a chemical cross-linking reaction, which gradually hardens and sets. Compression molds are mostly used for thermosetting plastics, and their molded plastic parts are mostly used for the shells of electrical switches and daily necessities.

　　   transfer mode

　　  Transfer mold is also called pressure injection mold or extrusion mold. The molding process of this mold is characterized by adding plastic raw materials into the preheated feeding chamber and then applying pressure from the pressure column to the plastic raw materials in the feeding chamber. The plastic is melted under high temperature and high pressure and enters the cavity through the casting system of the mold. The chemical cross-linking reaction occurs and gradually solidifies and forms. The transfer molding process is mostly used for thermosetting plastics, which can form plastic parts with more complex shapes.

　　  Extrusion die

　　  The extrusion die is also called extruder head. This kind of mold can continuously produce plastics with the same cross-sectional shape, such as plastic pipes, rods, and sheets. The heating and pressurizing device of the extruder is the same as that of the injection machine. The plastic in the molten state will form a continuous molded plastic part through the machine head, and the production efficiency is particularly high.

　　  In addition to the several types of plastic molds listed above, there are also vacuum forming molds, compressed air molds, blow molding molds, low-foaming plastic molds, etc.