| 摘要 |
PURPOSE:To enhance the productivity of a cutting tool whose crystal orientation is selected in its tip section to prolong the life thereof, for machining a disc made of non-ferrous metals or the like with a high degree of accuracy, by inclining the rake face of the cutting tool with a high degree of accuracy. CONSTITUTION:With a diamond cutting tool a rake face Ra is inclined at an angle alpha with respect to the (111) plane A, which is set within a range of 30+ or -5 deg.. That is, since the rake face Ra is inclined at an angle of 25-35 deg., it is inclined sufficiently in the direction of action of its cutting resistance. Further, as to the surface (1-1-1) plane B having a risk of cleavage in relation to cutting, simultaneously with the (111) plane A, since the (1-1-1) plane B is inclined with respect to the (111) plane A, crystallographically at about 70 deg., the inclined angle betawith respect to the rake face Ra is about 155-145 deg.. Thus, the direction of the cutting resistance F is greatly inclined so that it is possible to lower the possibility of occurrence of cleavage.
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