Kenjiro Uegami

Lapping and frictional properties of diamond, and characteristics of diamond cutting tool

Abstract Properties of single crystal diamond on the lapping, the friction and the cutting test (by diamond tool) have been studied with a special reference to the crystallographic orientation of diamond. By a novel apparatus newly designed, the orientation of diamond is identified in terms of X-ray diffraction technique, and other experiments were also conducted with the apparatus as setting the diamond oriented. In the lapping and frictional tests, the forces, the temperatures and the wears are measured. In the cutting tests, the friction between chip and tool rake face is calculated. The diamond reveals its highly anisotropic characteristics in the all tests. On the lapping test of diamond, it is clear that the force ratio, the temperature and coefficient of friction become lowest values in the direction of the {110} plane rather than the other. On the cutting aluminum alloy by diamond cutting tool, the minimum of the cutting force and coefficient of the friction revealed on the rake face which is identified with {110} plane, and its direction on the plane is direction, as same as the case of lapping and frictional examinations.

Crystallographic Orientation Analysis on Wear Shape of Single Crystal Diamond Cutting Tool

The single crystal diamond is known as an anisotropic substance on the friction and the lapping characteristics as to the crystallographic orientation. It might be considered that when using single crystal diamond tools, the cutting behavior would largely depend on the crystallographic orientation of the rake face and the cutting edge direction in which chip is flowed out on the diamond tool. The cutting forces, tool wears and wear shapes are measured in the case of the four kinds of tool having a combination of (100) or (110) rake face and or tool edge direction respectively.