How to judge whether the helmet mold is good or not?

1. Many resins and additives with high corrosion resistance have a corrosive effect on the surface of the mold cavity, which can cause metal dissolution and peeling on the surface of the mold cavity, worsen the surface condition, and deteriorate the quality of the plastic parts. Therefore, it is best to use corrosion-resistant steel or treat the surface of the mold cavity with chrome or nickel plating.
2. Good wear resistance. The surface glossiness and accuracy of injection molded parts are directly related to the wear resistance of the surface of the injection mold cavity. Especially when some plastics contain fiberglass, inorganic fillers, and certain pigments, they flow together with the plastic melt at high speed in the flow channel and cavity, causing significant friction on the surface of the cavity. If the material is not wear-resistant, it will quickly wear out, causing damage to the quality of the plastic parts.
3. When injection molding, the temperature of the mold cavity should reach 300 ℃ or above, so it is best to choose tool steel (heat treated steel) that has undergone appropriate tempering treatment, otherwise it will cause changes in the microstructure of the material, resulting in changes in the size of the injection mold. Maintaining good dimensional stability is also important.
4. Mold parts are mostly made of metal materials, and some of them have complex structural shapes. In order to shorten the production cycle and improve efficiency, it is required that the mold material is easy to process into the shape and accuracy required by the drawings.
5. Injection molded parts with good polishing performance usually require good gloss and surface condition, so the roughness of the cavity surface is very small. Surface processing, such as polishing, grinding, etc., must be carried out on the cavity surface. Therefore, the selected steel should not contain rough impurities and pores.
6. In order to improve hardness and wear resistance, injection molds are generally subjected to heat treatment, but this treatment should minimize the size change. Therefore, it is best to use pre hardened steel that can be machined.