1. Reasonably use the cooling lubricating fluid to play the three functions of cooling, washing and lubrication, keep the cooling and lubrication clean, and control the grinding heat within the allowable range to prevent the workpiece from being thermally deformed. Improve the cooling conditions during grinding, such as the use of oil-impregnated grinding wheels or internal cooling wheels. The cutting fluid is introduced into the center of the grinding wheel, and the cutting fluid can directly enter the grinding zone to exert an effective cooling effect to prevent burns on the surface of the workpiece.
2. The quenching stress after heat treatment is reduced to a minimum, because the quenching stress and the reticulated carbonized structure under the action of the grinding force, the phase change of the structure is extremely easy to cause cracks in the workpiece. For high-precision vowin.cn/' target='_blank'>molds, in order to eliminate the residual stress of grinding, low-temperature aging treatment should be performed after grinding to improve the toughness.
3, eliminate the grinding stress can also be immersed in the 260 ~ 315 ° C salt bath for 1.5min, and then cooled in 30 ° C oil, so the hardness can be reduced by 1HRC, residual stress reduced by 40% ~ 65%.
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 the steel piece with a length of 300 mm has a temperature change of about 10.8 μm when the temperature difference is 3 °C.
(10.8=1.2×3×3, the deformation amount per 100 mm is 1.2 μm/°C), and the influence of this factor should be fully considered in each finishing process.
