昆山达亮塑胶模具有限公司

1, rational use of cooling lubricating fluid to play the three major functions of cooling, washing and lubrication, keeping the cooling and lubrication clean, so as to control the grinding heat in the allowable range, in order to prevent the hot deformation of the workpiece. Improving the cooling conditions during grinding, such as the use of oil immersed grinding wheels or internal cooling wheels. The cutting fluid can be introduced into the center of the grinding wheel, and the cutting fluid can directly enter the grinding area to play an effective cooling effect and prevent the workpiece from burning on the surface.

2. The quenching stress after heat treatment is reduced to a minimum. Because of the quenching stress and reticular carbonization, the phase transition is very easy to crack the workpiece under the action of grinding force. In order to eliminate residual stress in grinding, high precision die should be treated at low temperature after grinding to improve toughness.

3. The removal of the grinding stress can also be dipped in the salt bath of 260~315 C for 1.5min, and then cooled in 30 C oil so that the hardness can be reduced by 1HRC and the residual stress is reduced by 40% to 65%.

4. For precision grinding of precision dies with dimension tolerance less than 0.01mm, we should pay attention to the influence of ambient temperature and require constant temperature grinding. It can be seen from the calculation that when the temperature difference of the 300mm long steel parts is 3 degrees C, the material has a change of about 10.8 m, (10.8=1.2 * 3 * 3, and the deformation of 100mm is 1.2 mu m/), and the influence of this factor should be fully considered in every finishing process.

5, electrolytic grinding is used to improve the precision and surface quality of the mould. In electrolytic grinding, the grinding wheel shave off the oxide film, instead of grinding the metal, so the grinding force is small and the grinding heat is small. It will not produce grinding burr, crack, burn and so on. The general surface roughness can be better than Ra0.16 mu m; in addition, the wear of the grinding wheel is small, such as grinding hard alloy, and the wear of SiC grinding wheel is about grinding out. The weight of cemented carbide is 400% to 600%. When using electrolytic grinding, the wear rate of grinding wheels is only 50% to 100% of the amount of hard alloy grinding.