セラミックスの研削加工面の強度に及ぼすツルーイング条件の影響

ホイールとツルアの周速比について

抄録

In grinding ceramic materials, the strength of ceramics is affected by the workpiece surface roughness and the cracks on subsurface formed during grinding operation. The truing speed-ratio S (the ratio of truer peripheral speed to wheel peripheral speed) can be varied to modify the wheel topography, with resulting changes in the grinding forces and the workpiece surface roughness. In this study, influence of the truing speed-ratio S and bond marterials on the strength of ground ceramics was investigated experimentally and the relation between the wheel topography and the strength of ground ceramics was also discussed. The experimental results indicate that there exists suitable truing speed-ratio to obtain the highest strength for grinding ceramics. The strength of ground ceramics declines when the diamond wheel is extremely sharp as well as extremely dull. It is suggestive that selecting truing speed-ratio is very important for grinding ceramics in order to guarantee the strength of ceramics. It is also pointed out that the strength is affected by elastic modulus of bond materials remarkably. The strength deterioration will be lower when ceramics was ground by wheels with low elastic modulus such as resin-bonded wheels than that by wheels with high elastic modulus.