Mechanical polishing is mainly done manually, so polishing technology is still the main influence polishing quality. In addition, the mold material, surface conditions prior to polishing and heat treatment process. High-quality steel is a prerequisite to get a good polishing quality, uneven or characteristics of the steel surface hardness differences tend to produce polished difficult. Steel in a variety of inclusions and pores are not conducive to polishing.
1 Different hardness affect the hardness of the polishing process increased so that the grinding difficulties increase, but reduce the roughness of polished. Due to increased hardness, lower roughness required to achieve a corresponding increase of polishing time. Hardness increased, excessive polishing of the possibility of a corresponding reduction.
2 workpiece surface conditions on the polishing process of the steel in the crushing process of cutting machining, surface damage due to heat, internal stress, or other factors, improper cutting parameters affect the polishing effect. EDM surface than the surface more difficult in the ordinary machining or heat treatment after grinding, EDM refined criteria should be adopted before the end of EDM dressing, or hardening thin layer formed on the surface. If the spark refinement criteria inappropriate choice of the heat-affected layer depth of up to 0.4mm.
Hardening thin layer of hardness than the hardness of the matrix must be removed. Therefore better to increase the processing of a coarse grinding to completely remove the damaged surface layer, to form an average rough metal surface to provide a good basis for polishing.
Chemical polishing for the polishing requirements of the degree is not high occasions, need to be heated to use, the present technology, is able to use the above three kinds of polishing do not use chemical polishing, chemical polishing effect, higher overall costs.
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