1. Reasonably use cooling and smoothing fluid to achieve the three major effects of cooling, brushing, and smoothing. Adhere to cooling and smooth cleaning, and then control the grinding heat within the allowable range to avoid thermal deformation of the workpiece. Improve the cooling conditions during grinding, such as using oil immersed grinding wheels or internally cooled grinding wheels. Introduce cutting fluid into the base of the grinding wheel, which can directly enter the grinding area, exhibiting effective cooling effect and avoiding surface burns of the workpiece.
2. Reduce the queuing stress after heat treatment to the minimum limit Due to the arrangement of queuing stress and network carbonization under the effect of grinding force, phase transformation can easily cause cracks in the workpiece For high precision molds, in order to identify residual stresses during grinding, low performance aging treatment should be carried out after grinding to improve durability
3. To minimize grinding stress, the mold can also be immersed in a salt bath at 260-315 ℃ for 1.5 minutes, and then cooled in oil at 30 ℃ This can reduce hardness by 1HRC and residual stress by 40-65%
4. For precision grinding of precision molds with a scale of less than 0.01mm, attention should be paid to the impact of environmental temperature, and constant temperature grinding is requested According to the calculation, for a 300mm long steel component with a temperature difference of 3 ℃, the data shows 10.8% μ The change in m arrangement, (10.8=1.2) × Three × 3. Deformation of 1.2 per 100mm μ (m/℃), each precision machining process needs to fully consider the impact of this element
5. Using electrical grinding to improve the precision and surface quality of mold production When electric grinding, the grinding wheel scratches off the oxide film install of grinding the metal, so the grinding force is small and the grinding heat is also small There will be no grinding burrs, cracks, burns, and other phenomena Generally, the surface roughness can be better than Ra0.16 μ M; In addition, the wear of the grinding wheel is relatively small For example, when grinding hard alloys, the wear of the silicon carbide grinding wheel is about 400% to 600% of the weight of the hard alloy that has been ground When using electrical grinding, the wear of the grinding wheel is only 50% to 100% of the weight of the hard alloy that has been ground

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