Improved monolayer CBN wheel for load free grinding

Abstract A galvanically bonded wheel made of a monolayer of CBN grits may not always ensure free cutting action when a large volume of chips is to be handled because of the fact that about two thirds or more of the grit height has to be covered by the matrix for effective anchorage. The present study shows that the problem of chip accomodation during grinding is further aggravated when the CBN wheel has some surface defect like growth of the galvanic layer in the space between the grits. In order to utilize more effectively the extraordinary capability of CBN grits, a new kind of monolayer CBN wheel has been developed, using a special bonding technique (patent pending). This technique keeps the level of the bond material low but sufficient to hold the grits during grinding. Performance of this CBN wheel relative to that of a galvanically bonded wheel, with particular reference to its grinding capability while grinding unhardened 100 Cr6 steel is discussed in this paper.