ANALYSIS OF TANGENTIAL FORCE ON THE CONSTANT-LOAD GRINDING OF ZRO2-Y2O3 BY VITRIFIED BONDED DIAMOND WHEEL

In order to investigate the grinding actions of the pored type diamond wheel with vitrified bond, the tangential force on the constant-load grinding of ZrO2-Y2O3 was theoretically analyzed. The influences of th e structure of a wheel on the force were numerically presented by the three loading rates which relate directly to the constituent ratios of diamond abrasive grain, filler grain and bond. The force is closely r elated to the ploughing action of tips on the ground surface. The cutt ing action of diamond abrasive grain decreases and the frictional acti on between abrasive grain and the workpiece increases by adding filler grain in a wheel. The calculated values of force are large on grindin g of ZrO2-Y2O3 fired at higher temperatures. The smallest values of fo rce are on grinding of ZrO2-Y2O3 doped with 3 mol% Y2O3, but the calcu lated values abruptly increase on grinding of ZrO2 doped with 4 and 6 mol% Y2O3 due to their small plastic yield pressures.