軽切削における負すくい角-35°の超硬工具の有効性

In this paper, the results of tests about practicability of the carbide tools having various rake angles on the light cutting are described. According to the data obtained, the carbide tool with negative rake angle -35° is the most excellent. And the conclusion is as follows : (1) If the cutting speed is more than 100 m/min, the appearance of the turned surface is favorable.(2) At the beginning of cutting, the roughness value of the turned surface is about 1.6 μmRmax.(3) The tool life is about four times of the life of the carbide tool, used in general, with negative rake angle -5°.(4) The length of chip is 50-80 mm, then the chip removal from the lathe is easy.