1989 年 55 巻 1 号 p. 185-190
A cluster of metal bonded diamond wheel (SDC 100) is dressed by GC abrasive sticks of various mesh sizes, and contour maps of the wheel surface topography are drawn by using a three-dimensional profile measuring instrument, which is an improvement on conventional profilometer of stylus type. Characteristic values of topography, i. e., positional distribution of cutting edges in the wheel depthwise direction, tip angle and flat part length of cutting edge, and protrusion height of abrasive from bond matrix are derived from the contour maps. Dressing effects are evaluated by using these characteristics, and following results are obtained : (1) Cutting edges sharpen with an increase in dresser infeed and grain size of abrasive stick. (2) Cutting edge changes the distribution pattern from exponential to uniform when dressing condition becomes rough. (3) Mean protrusion height of diamond grain increases when dress infeed or grain size of abrasive stick becomes large. This tendency to increase is, however, reversed when abrasive stick is excessively coarse and falling out of diamond grain from bond matrix is remarkable.