The effect of cutting conditions such as\nnumbers of tool teeth, depth of cut and cutting speed on the\ncutting resistance about 12%Cr steel hasn�t been studied\nbefore. So the effect of cutting conditions on the cutting\nresistance will be investigated in this paper. The relationship\nbetween cutting resistance and work damaged layer will be\ntaken into consideration. The results are as follows. (1)The\ncutting resistance becomes larger with the increase of the\ndepth of cut and the numbers of tool teeth. It has no relation\nwith cutting speed. (2)The depth of work damaged layer\nincrease with the increase of the depth of cut and numbers of\ntool teeth. It does not change with the increase of cutting\nspeed. (3)The deformation of cutting surface becomes larger\nwith the increasing depth and numbers of tool teeth. It\nchanges a little with the increase of cutting speed. (4)It was\nfound that the depth of work damaged layer increased with\nthe increase of the cutting resistance. The depth of work\ndamaged layer is thought to have an intimate relation with\nthe cutting resistance. (5)The experimental value for work\ndamaged layer by hardness measuring is thought to be\nreasonable value, because the experimental value is nearly\nequal to the evaluated one obtained from Sokolovs kii�s stress\nequation.
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