In the grinding process, with the grinding wheel wear, grinding wheel face the state is also changing. The longer lower the wheel's cutting ability, various grinding defects will also continue to occur, the grinding reach standards. Then to reach the normal state of grinding wheel dressing. We usually refer to the life of the grinding wheel is a wheel between the two trim actual grinding time. Direct impact on the length effect of grinding wheel life, and more important particularly for forming grinding.
Determine the wheel life
General phenomena according to the wear of the grinding wheel manufacture, through observation and testing. Grinding wheel wear phenomenon:
The grinding process of self-excited vibration, the surface of the workpiece regenerative chatter marks;
Grinding noise increases;
Workpiece surface grinding Burns;
The grinding force sharp increase or decrease;
The grinding accuracy dropped;
The grinding surface roughness.
The said grinding phenomenon is not reason to produce independently, and between them there is a correlation. There are two of these phenomena require special attention: first, thermal damage to the workpiece surface temperature grinding; Second, due to the decline of the self-excited vibration caused by the roughness and precision.
Diamond anisotropy, so that not only the hardness of the various crystal faces, abrasion resistance is different in different directions is the same crystal surface wear resistance is also different. If the crystal is improper selection, even if the crystal surface choose correctly, grinding efficiency will be greatly reduced. And diamond crystals compressive strength than the tensile strength is 5 to 7 times, in the grinding process to select the grindability of the direction of the crystal plane, while the edge to greet sharpening the positive direction of the wheel speed at the same time (i.e. take the inverse mill), to ensure the efficiency of the sharpening and reduced edge microscopic degree of cleavage.grinding wheel
Diamond tool wear, breakage
Diamond tool wear mechanism is more complex, and can be divided into macro-wear and microscopic wear and the former mechanical wear, the latter thermochemical wear. The common diamond tool grinding type of damage to the rake face wear, flank wear and edge crack. In the single-crystal diamond tool sharpening process, its wear sharpening to meet the requirements of the tool, except for generating the unnecessary wear and tear it is possible to damage the already sharpening good front and rear flank. Edge chipping (i.e., chipping) is the stress in the blade over the diamond tool local affordability, and is generally caused by damage to the micro-cleaving by diamond crystals along the (111) crystal plane. Ultra-precision machining, the diamond tool edge radius of the cutting edge is relatively small, which itself is a hard and brittle material, because of its anisotropy and the (111) surface is prone to cleavage, with vibration and grinding wheel grit abrasive tools edge the mouth of the shock effect, it is often accompanied by a chipping phenomenon.