Fabrication and performance of monolayer brazed CBN wheel for high-speed grinding of superalloy

Abstract

The monolayer brazed wheels, which have several advantages such as high bonding strength, high chip storage space, and uniform grit spacing, have drawn much attention in the grinding of different-to-machine materials. As pursuing for higher machining efficiency, special attention has been devoted to high-speed grinding. However, when the grinding wheel is fabricated by conventional brazing technology, the thermal deformation of the wheel is remarkable, and the accuracy of brazed wheel cannot meet the needs of high-speed grinding. To take the challenge of the unexpected wheel deformation after brazing, a new brazing technology, named continuous induction brazing, was proposed to fabricate monolayer brazed cubic boron nitride (CBN) wheel with diameter d s = 400 mm for high-speed grinding. The experiments and analysis revealed that chemical bonding between CBN grains and filler alloy was achieved. The maximum thermal deformation of the newly brazed wheel was less than 16 μm. High-speed grinding performance of the brazed CBN wheel for grinding of Inconel718 superalloy showed that the grinding wheel has good bonding strength. Moreover, a relatively satisfactory ground surface quality was achieved.