How to improve the accuracy of automotive injection molded parts?

The processing accuracy of automobile injection molded parts is achieved by the cooperation of the injection mold, the performance of the plastic raw materials, the performance of the injection molding machine, and the injection molding process. The accuracy of injection molds can generally reach 0.002mm, while the processing accuracy of injection-molded plastic products can only reach about 0.02mm. How to provide processing accuracy during processing?

Methods to improve the molding accuracy of automotive injection molded parts:

1. The design of the mold structure must be good and meet good accuracy requirements.

2. Selection of mold materials. The more stable the material, the better the toughness.

3. During the injection molding process, the injection pressure must be accurately controlled so that the raw material melt can evenly fill the injection mold. Do not cause problems such as burrs due to excessive pressure.

4. Should the injection speed be too fast or too slow? Too fast can cause burrs and spills. Too slow will result in insufficient accuracy and imperfect structure.

5. The processing temperature is too low, the color of the raw materials is uneven, the temperature is too low, the fluidity is poor, and the screw of the injection molding machine is in danger of breaking.

6. Choose appropriate raw materials. Different raw materials have different shrinkage rates, which will also to changes in accuracy.

7. To achieve precision, you must choose a high-precision injection molding machine.

During the injection molding process of automobile injection molded parts, a little carelessness will often to defects in the plastic products, thereby affecting the injection molding efficiency. Next, we will briefly analyze the problem of uneven injection color of automotive injection molded parts.

In the molding process of automobile injection molded parts, to make the plastic parts have richer colors, we always add an appropriate amount of color-adjusting substances to the raw materials. However, for one reason or another, uneven colors may still occur. So, what are the reasons for the uneven color of injection molding?

1. Poor colorant diffusion, which often results in patterns near the gate.

2. Plastic or colorant has poor thermal stability. It is necessary to stabilize the color tone of the product and strictly fix the production conditions, especially the material temperature, material quantity, and production cycle.

3. For crystalline plastics, try to make the cooling rate of each part of the product consistent. For products with large wall thickness differences, colorants can be used to mask the color difference. For products with uniform wall thickness, the material temperature and mold temperature should be fixed.

4. The shape, gate form, and position of the product have an impact on the plastic filling situation, resulting in color differences in some parts of the product, which should be modified if necessary.