Abstract
This paper deals with the ultrasonic screw vibration tapping for aluminium and its alloy. Cutting torque, chip geometry and female thread shape were investigated and the following results were obtained. In the case of pure aluminium tapping, the torque ratio (i. e. vibration tapping torque/conventional tapping torque) was about 1/2 in dry tapping, about 1/10 in tapping with machine oil and about 1/15 in tapping with kerosene. In addition, the chip geometry became very long and thin, and cross section of female thread was sharp trapezoid geometry. The clearance between female screw and tap in the vibration tapping was almost equal to that of conventional tapping. Effect of vibration tapping was recognized remarkably for the difficult machining aluminium (A 1050), but slightly for the machinable wrought aluminium alloy (A 2017-T 3).
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