Abstract
For objective of cost reduction of automobile unit parts, we develop to change process in the cutting process that Equipment Cost is low from the grinding process that Equipment Cost is high. In hardness materials not less than 60HRC, cutting is possible in continuity cutting by CBN tool and ceramic tool. However in interrupted cutting of spline outside diameter of unit parts, there is matter that tool life is short so that continuous impulse force acts on tool cutting edge. So we applied oblique cutting method in interrupted cutting, and investigated tool life. As a result it was able to extend tool life for conventional single point cutting largely, and was able to make roughness too small than conventional grinding level.
