Case 1: Grain breaks out of ceramic bond (bulk wear)— Wheel stays sharp, but loses size.
Case 2: Grain dulls (attritional wear)— Wheelkeepsdimension; surfacefifinishimproves; grinding force is high; risk of burning.
Case 3–a: Grain fracture of mono crystal (fracture wear)— Wheel dulls somewhat and loses some dimension.
Case 3–b: Grain fracture along particle boundaries of sintered grain—Dimension is stable; wheel is always very sharp.
Sintered aluminum oxide grains comprise of particles in a measure run of a tenth of a micron. This clarifies the contrast in break characteristic between routine aluminum oxide and sintered grains. Ordinary grains, as appeared in Figure 1a, left-break like a mono gem. A grain, sintered from a few hundred million aluminum oxide particles—as appeared in Figure 1b—will create a break that about jam the original size of the grain and creates a high number of cutting edges. It often appears that the sintered grain structure has rake and relief angles. The wheel wear rate versus the metal removal rate is an indication of how much wheel wear occurs during a certain material removal. This indicator also reveals how frequently redressing is required and what the life will be of a complete grinding wheel. Regarding sintered aluminum oxide, the wheel wear is almost independent from the metal removal rate. Usual metal removal rates in bevel gear grinding lead to about a third of the grinding wheel wear, as compared to conventional aluminum oxide.
Wanfu Precision Co.,Ltd