The phrase "The Working Principle of Automotive Interior Plastic Parts (1000-10000 RMB per Month)" might be ambiguous. You might be looking for information on the job content and technical principles of automotive interior plastic parts-related positions with monthly salaries of 1000-10000 RMB, or you might want to understand the technical working principles of automotive interior plastic parts from production to application. In this context, I understand you are more likely interested in the latter-the manufacturing and working principles of automotive interior plastic parts.
The following is a detailed analysis based on mainstream industry technologies:
Core Manufacturing Principle of Automotive Interior Plastic Parts: Injection Molding
Automotive interior plastic parts (such as dashboards, door panels, center consoles, etc.) are mainly manufactured using injection molding. Its working principle is a precise process integrating materials, molds, equipment, and process parameter control.
1. Material Plasticization
Plastic granules (such as PP, PC, ABS, PEI, etc.) enter the injection molding machine barrel from the hopper and melt into a viscous flow state under the shearing action of the heating coil and screw.
For example, the plasticizing temperature of polypropylene (PP) is typically between 180–240℃.
High-performance materials such as PEI (polyetherimide) possess high heat resistance, with a heat distortion temperature exceeding 200℃, making them suitable for interior parts in high-temperature environments.
2. High-Pressure Injection
Molten plastic is injected into the sealed mold cavity at high speed and high pressure through a nozzle, driven by the screw.
Injection pressure is typically between 50–150 MPa to ensure complete filling of complex structures (such as dashboards with buttons).
The design of the gating system (main runner, branch runners, gate) directly affects the uniformity of filling and the appearance quality.
3. Pressure Holding and Cooling
Pressure Holding: Compensates for plastic shrinkage during cooling, preventing shrinkage and dents.
Cooling: Cooling is achieved through circulating cooling water channels within the mold. Cooling time accounts for 50%–70% of the entire cycle and is crucial for improving efficiency.
4. Demolding and Post-processing
After cooling and solidification, the ejection system pushes the part out of the mold, followed by trimming, quality inspection, painting, or assembly processes.
