Performance study of brazed type cBN grinding wheel on hardened bearing steel and high speed steel

An investigation was carried out to explore the grinding capability of brazed type cBN grinding wheel on two engineering steel-bearing steel and high speed steel. The grinding forces were measured and the chips were collected and the surface features of ground cBN grinding wheel were examined by SEM. The SEM photographs showed that cBN grits were distributed uniformly on the peripheral wheel. The results indicate that material removal mechanisms are different for both the steel. In spite of high hardness of the bearing steel, the brazed type wheel was grind very effectively without having any wheel loading and rise of unusual forces. But while grinding the high speed steel; the tangential forces (proportional to the specific energy) were quite high due to hot hardness of the work material. The formation of chips was favourable in different mode of grinding condition. In long duration grinding test, the surface topography showed almost unchanged i.e. no grits pull out without having any substantial fracture.