Abstract
The results of an experimental study on the chip formation in grinding by a single point tool are described. Grinding test was performed in the fly milling operation (overcut method), where the tool was mounted on the periphery of a metal disk. The chip formation, particularly, the macro or micro structure of the saw-tooth type chip and the balloon type chip have been observed by a scanning electron microscope. The main results obtained are as follows : (1) In the carbon steel, the chip formation was found to be variable from the saw-toothed chip to the small balloon type chip with the increase of the grinding wheel speed. This tendency was also observed at the case of grinding hardened steel.(2) In the saw-toothed chip, when the grinding wheel speed was increased, the length of slip band on the upper surface of the chip decreased and the burned surface was observed on the opposite side of these chip.(3) The mean diameter of the balloon type chips in annealed steel was as about 1.4 large as that in hardened steel, and the variance in both distribution of the chip diameter is also significant.
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