研削砥石のクラッシングに関する研究(第1報) : クラッシングの目直し効果について

概要

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The crushing mechanism is investigated experimentally by measuring crushing force, crush roll actual infeed, surface topography and roundness of grinding wheel, and finished surface roughness. Experiments are carried out by using cylindrical grinding machine and by driving crush roll with workpiece spindle. Results are as follows : (1) In crushing operation, two states exist, one is transient state in which only dressing effect appears and a reduction in grinding wheel diameter caused by bond and grain fractures does not occur, and another is stable state in which grinding wheel is crushed with the crush roll infeed rate set up. The transient crushing is caused by an elastic behaviour between crush roll and grinding wheel, and the stable crushing start time can be derived theoretically. (2) In stable crushing, cutting edge shape becomes sharper than that of grinding wheel dressed by diamond tool, and the positional distribution pattern takes uniform one. The distribution density decreases rapidly with an increase in crush roll infeed Δ per one revolution of grinding wheel, although the decreasing rate is limited by Δ. (3) Crushing out contributes to the improvement in grinding wheel roundness and surface topography, and the degree of improvement depends on Δ.
社団法人精密工学会の論文
1985-04-05