The mechanical polishing of export injection molds is a very detailed manual work. Therefore, the polishing technology of export injection molds is still the main factor affecting the quality of mold polishing. In addition, it is also related to the export injection mold material, surface condition before polishing and heat treatment process. High-quality mold steel is a prerequisite for good polishing quality. If the surface hardness of the mold steel is uneven or the performance is different, the various inclusions and pores in the mold steel are not conducive to polishing. Even experienced polishers The effect is not good either.
Different hardnesses of export injection mold steel have different throwing effects. Although the hardness of mold steel increases the grinding difficulty and the polishing time, the roughness will be reduced after polishing and the polishing effect will be better. At the same time, as the hardness increases, the potential for surface differences caused by overpolishing decreases.
The preliminary processing technology of export injection molds also has a certain impact on polishing. During the process of cutting mold steel, the surface layer will be damaged by factors such as heat and internal stress. During cutting, the rotation speed and feed rate must be relatively uniform, so as not to Affects the export mold polishing effect. The EDM machined surface will be more difficult to polish than the surface processed by ordinary cutting or heat treatment, so before the EDM is completed, EDM trimming should be carried out, otherwise a hardened layer will be formed. If the selection criteria are not appropriate, the depth of the cauterized hardened layer can reach 0.4mm. The hardness of the hardened layer is higher than that of the steel body, so it should be removed as much as possible to lay a good foundation for subsequent polishing.