切れ刃先端を研磨仕上げしたメタルボンドダイヤモンド砥石の高精度ツルーイング

抄録

This report deals with the precision truing process of metal bond diamond wheels for truing up cutting edges. This truing process consists of three steps. In the first step, the runout of the wheel mounted on a spindle is reduced by machining both diamond grains and the bond of the grinding wheel with a truing diamond wheel. In the second step, the bond is removed using the electrolytic dressing to a depth of 1/3-1/4 the average grain size of the grinding wheel. In the last step, the cutting edges of the grinding wheel are lapped with a cast iron plate for truing up. After performing this truing process on a # 400 diamond wheel, the runout of the mounted wheel was reduced to within 0.3 μm, and the accumulative cutting edges below 0.5 μm depth in the outmost wheel surface were increased more than six times those after conventional truing. Therefore, the bottom of groove in one pass grinding on ZrO₂ with a # 400 diamond wheel is machined in ductile mode, and the surface roughness is extremely improved (2.1 μmR_max→ 0.2 μmR_max).