4. For precision grinding of precision molds with a dimensional tolerance of less than 0.01 mm, attention should be paid to the influence of ambient temperature, and constant temperature grinding is required. It can be seen from the calculation that for a steel piece with a length of 300 mm, the material has a change of about 10.8 μm at a temperature difference of 3 ° C (10.8 = 1.2 × 3 × 3, and the deformation amount per 100 mm is 1.2 μm / ° C), and each finishing process needs to be fully considered. The impact of this factor.
5. Using electrolytic grinding to improve mold manufacturing accuracy and surface quality. In electrolytic grinding, the grinding wheel scrapes off the oxide film: instead of grinding the metal, the grinding force is small, the grinding heat is small, and no grinding burrs, cracks, burns, etc. occur, and the surface roughness is generally better than Ra0. .16μm; In addition, the wear of the grinding wheel is small, such as grinding cemented carbide, the wear of the silicon carbide grinding wheel is about 400% to 600% of the weight of the hardened carbide. When grinding with electrolytic grinding, the wear of the grinding wheel The amount is only 50% to 100% of the amount of cemented carbide.