1. Select the grinding amount reasonably, and adopt the fine grinding method with small radial feed or even fine grinding. If the radial feed and grinding wheel speed are appropriately reduced, and the axial feed is increased, the contact area between the grinding wheel and the workpiece is reduced, and the heat dissipation conditions are improved, thereby effectively controlling the increase of the surface temperature.

2. Reasonable selection and dressing of the grinding wheel, white corundum grinding wheel is better, its performance is hard and brittle, and it is easy to generate new cutting edges, so the cutting force is small, the grinding heat is small, and medium grain size is used in the particle size, such as 46-60 mesh is better, and the hardness of the grinding wheel is medium-soft and soft (zr1, zr2 and r1, r2), that is, the coarse-grained, low-hardness grinding wheel, which has good self-excitation and can reduce the cutting heat.

It is very important to choose an appropriate grinding wheel during fine grinding. According to the high vanadium and high molybdenum conditions of the mold steel, it is more suitable to use gd single crystal corundum grinding wheel. Grinding wheel, organic binder grinding wheel has good self-grinding performance, and the roughness of the ground workpiece can reach ra0.2μm. In recent years, with the application of new materials, cbn (cubic boron nitride) grinding wheel shows very good processing effect. Finishing on CNC forming grinder, coordinate grinder, cnc internal and external cylindrical grinder, the effect is better than other types of grinding wheels. In the grinding process, attention should be paid to dressing the grinding wheel in time to maintain the sharpness of the grinding wheel. When the grinding wheel is passivated, it will slide and squeeze on the surface of the workpiece, causing burns on the surface of the workpiece and reduced strength.

3. Rational use of cooling lubricating fluid, play the three major roles of cooling, washing and lubrication, keep cooling and lubrication clean, so as to control the grinding heat within the allowable range to prevent thermal deformation of the workpiece. Improve the cooling conditions during grinding, such as using oil-immersed grinding wheels or internal cooling grinding wheels. The cutting fluid is 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 surface of the workpiece from being burnt.

4. Reduce the quenching stress after heat treatment to a minimum, because the quenching stress and the reticulated carbonized structure under the action of grinding force, the phase transformation of the structure is very easy to cause cracks in the workpiece. For high-precision molds, in order to eliminate the residual stress of grinding, low-temperature aging treatment should be performed after grinding to improve toughness.

5. To eliminate grinding stress, the mold can also be immersed in a salt bath at 260 to 315 °C for 1.5 min, and then cooled in oil at 30 °C, so that the hardness can be reduced by 1hrc, and the residual stress can be reduced by 40% to 65%.

6. For precision grinding of precision molds with a dimensional tolerance of 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 when the temperature difference of 300 mm is 3 ℃, the material has a change of about 10.8 μm, (10.8=1.2 × 3 × 3, the deformation per 100 mm is 1.2 μm/℃), and each finishing process needs to be fully Consider the impact of this factor.

7. The use of electrolytic grinding, mold manufacturing precision and surface quality. During electrolytic grinding, the grinding wheel scrapes off the oxide film instead of grinding metal, so the grinding force is small, the grinding heat is also small, and there will be no grinding burrs, cracks, burns, etc. The general surface roughness can be better than ra0 .16μm; in addition, the wear of the grinding wheel is small, such as grinding cemented carbide, the wear amount of the silicon carbide grinding wheel is about 400% to 600% of the weight of the ground cemented carbide. Japan, Russia and other countries are developing a new technology and new technology.

TransGrind Tools is professionally specialized in manufacturing concrete floor diamond tooling for concrete surface preparation, We have much experience and advanced technology to manufacturing and exporting diamond tools and are familiar with the equipment and machinery that is being used today. For more information about diamond tools for concrete surface preparation, please visit our website or consult us directly.