Kenjiro Okamura

Study on Grinding Force Ratio.

The purpose of this study is to elucidate the root cause of a change of the grinding force ratio, which is the ratio of the tangential force and the radial force. In the grinding tests of this study, the interference shape per cutting edge and the state of the cutting surface of the wheel were changed systematically. The following results were obtained: ( 1 ) When the state of the cutting surface of the wheel and the peripheral wheel speed are held constant, the product of the interference length and the maximum interference depth per cutting edge of abrasive grain decides the grinding force ratio. ( 2 ) The grinding force ratio shows a rise with the increase of successive cutting edge spacing, and the increase of the rate of the area of grain flank reduces the grinding force ratio. ( 3 ) The grinding force ratio in a series of experiments is decided by the quotient of the product of values of interference condition per cutting edge and the rate of area of grain flank in the cutting surface of the wheel.

Study on Cutting Force Ratio.

In metal cutting, it is a well-known fact that the value of Q/P, which is the ratio of the tangential force Q and the radial force P, is remarkably different in machining and grinding. In this paper, considering machining and grinding collectively, investigation on the effects of basic factors which produce such differences systematically was carried out by a simple model experiment. The results of the experiment made it cleat that compared to machining, in grinding, all values of the basic factors such as interference depth of cutting edge and workpiece, cutting speed, cutting edge condition, etc. are in the direction toward reducing the cutting force ratio. Moreover, the results of an overall grinding test showed that the force ratio in grinding is controlled by the product of the interference length and the maximum interference depth per cutting edge of the abrasive grain on the cutting surface of the grinding wheel.