Research on CBN Finishing Hob : Turning and Fly Tool Cutting Tests

Abstract

The development of CBN finishing hobs able to finish hardened gears efficiently and accurately is the objective of this research. To study the possibility of a CBN finishing hob, intermittent turning tests and fly tool cutting tests similar to hobbing were carried out. The optimum form and size for the chamfer land of the cutting edge were determined. The influences of cutting speed and workpiece hardness on the flank wear and the roughness of the finished surface were clarified. It was also shown that dead metal occurs on the chamfered cutting edge and roughens the cutting surface. Without dead metal, the roughness of the cutting surface corresponds to that of the flank face.