The cutting mechanism in ultrasonic cutting is considered in this report and the main results are as follows : 1) Amplitude and frequency have relations with the cutting speed and the critical cutting speed V
c=0.376 af m/min (a : amplitude micron, f : frequency kirocycle). 2) Cutting time t
c in one cycle is very short. (for example t
c=10
-6s3) Cutting length l
T in one cycle is V/f. (for example l
T=0.08 micron) 4) And at a cutting speed lower than this critical cutting speed, the cutting tool is separated from the chip in each cycle and is cooled by air or can be lubricated exactly by using the usual lubricant without special cutting fuild.
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