Abstract
The purpose of this study is to establish the cutting method of fine ceramics under high temperature condition. Silicon nitride, which is heated by plasma arc, is successfully cut with a CBN tool. Cutting forces decrease with the increase of the heating temperature, and over 1000°C, they become below those of carbon steel cut under the same condition at room temperature. By raising the heating temperature, the chip shape changes from segmental type to flow type, and above 1550°C the formation of perfect flow type chip is observed. To reduce the wear of CBN tips and prolong the tool life, the cooled tool is devised, and it is observed that the cooled tool has 10 times longer tool life than that of conventional tool. The structural change of the material after cutting is examined through SEM, ultrasonic microscope and optical microscope, but no change is observed.
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