定常研削過程におけると粒切れ刃分布と研削特性 鋼の立軸平面重研削の研究

Abstract

In the vertical spindle abrasive machining of steels, the grinding wheel is not dressed usually since it is self-sharpening. The grinding process rapidly becomes the steady state after the start of downfeed. The distribution of abrasive grains in the steady grinding process varies with the grinding conditions. In this paper, the effects of grinding conditions on the distribution of abrasive grains with relation to the grinding force and the wheel wear are investigated experimentally, and the following conclusions are drawn. In the steady grinding process the distribution of abrasive grains, in spite of the initial state of wheel active face, depends on the grinding conditions. The number of abrasive grains per unit area is relatively high for the work materials producing higher specific grinding force. And, it decreases as the wheel grade is decreased and the downfeed rate is increased. The grinding force nearly corresponds to the number of abrasive grains per unit area. The grinding force 1s low for the work materials making the number of abrasive grains per unit area decrease. The number of cutting point per unit area decreases as the average length of chip is increased, and the specific wheel wear increases. This tendency is remarkably seen for the work materials making the number of abrasive grains per unit area decrease.