The injection mold is made of tool steel. In the work, it encounters corrosive gases, water and other substances that cause rust. The plastic parts made from rusty molds will have quality problems, so they need to be eliminated.

The so-called exposed fiber is the glass fiber exposed on the surface of the product, relatively rough, the appearance is more difficult to accept, the possible causes of analysis: When adding this kind of filler, the physical mixing method is generally used, so only the glass fiber is evenly dispersed in the middle of the plastic, but after the plastic melts, the mixture will have different degrees of separation (depending on the proportion of the added and the length of the glass fiber, and the temperature of the raw material also has a certain degree of influence).

When the molten plastic meets the insert, the hole, the flow rate is not coherent, the area where the flow of the filling material is interrupted in the mold cavity, and when the pouring gate jet filling occurs, the linear fusion mark is produced because it cannot be completely fused. The existence of weld marks greatly weakens the mechanical strength of the product. The method of overcoming the weld mark is basically the same as that of reducing the dent of the product.

The basis for setting the speed segment must take into account the mold geometry, other flow constraints and instability factors. The speed setting must have a clear understanding of the injection molding process and material knowledge, otherwise, the product quality will be difficult to control. Because the melt flow rate is difficult to measure directly, it can be calculated indirectly by measuring the screw forward speed, or the cavity pressure (to determine that the check valve does not leak).

The polishing in the plastic mold processing is very different from the surface polishing required in other industries, and strictly speaking, the polishing of the mold should be called mirror processing. It not only has high requirements for polishing itself but also has high standards for surface smoothness, smoothness and geometric accuracy. Surface polishing generally requires only a bright surface.

The development of plastic injection molding equipment and technology is of great significance to the promotion of plastic injection molding industry. This paper will be elaborated from two aspects of equipment and technology.