Note on polishing of export injection moulds
Release Time：
2021-06-25
Source：
The mechanical polishing of export injection moulds is a very meticulous manual work, so the technology of export injection mould polishing is still the main reason that affects the quality of mould polishing today. 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 mold steel surface hardness is not uniform or performance differences, various inclusions and porosity in the mold steel is also not conducive to polishing, even experienced teachers polishing out the effect is not good. Export injection mold steel of different hardness throw out the effect is not the same, mold steel hardness although grinding difficulty increases, polishing time consumption, but the roughness will be reduced after polishing, the polishing effect obtained better. At the same time, the hardness increases, the possibility of surface differences caused by excessive polishing is also reduced accordingly. Export injection mold pre-processing process also has a certain impact on polishing, in the process of cutting mold steel, the surface layer will be damaged by heat, internal stress and other factors, cutting must ensure that the speed and feed rate is relatively uniform, in order not to affect the export mold polishing effect. EDM processing surface than ordinary cutting class processing or heat treatment of the surface will be more difficult to polish, so before the completion of EDM processing, EDM trimming should be carried out, otherwise a hardened layer will be formed. If the selection standard is not appropriate, the depth of the burned hardened layer can be up to 0.4mm. the hardened layer of hardness to be higher than the steel body, to remove it as much as possible, to lay a good foundation for the subsequent polishing process.
The mechanical polishing of export injection moulds is a very meticulous manual work, so the technology of export injection mould polishing is still the main reason that affects the quality of mould polishing today. 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 mold steel surface hardness is not uniform or performance differences, various inclusions and porosity in the mold steel is also not conducive to polishing, even experienced teachers polishing out the effect is not good.
Export injection mold steel of different hardness throw out the effect is not the same, mold steel hardness although grinding difficulty increases, polishing time consumption, but the roughness will be reduced after polishing, the polishing effect obtained better. At the same time, the hardness increases, the possibility of surface differences caused by excessive polishing is also reduced accordingly.
Export injection mold pre-processing process also has a certain impact on polishing, in the process of cutting mold steel, the surface layer will be damaged by heat, internal stress and other factors, cutting must ensure that the speed and feed rate is relatively uniform, in order not to affect the export mold polishing effect. EDM processing surface than ordinary cutting class processing or heat treatment of the surface will be more difficult to polish, so before the completion of EDM processing, EDM trimming should be carried out, otherwise a hardened layer will be formed. If the selection standard is not appropriate, the depth of the burned hardened layer can be up to 0.4mm. the hardened layer of hardness to be higher than the steel body, to remove it as much as possible, to lay a good foundation for the subsequent polishing process.
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