Abstract
In this paper, a new axial ultrasonic vibration microdrilling technology has been developed which restrains the skidding motion of miniature drills at the beginning of penetration. The causes and mechanisms of the initial skidding motion of the drill in conventional drilling have been analyzed. The mechanisms of intermittent cutting and initial penetration of the chisel edge, and the dynamic stability of the drilling machine have been investigated analytically. An experimental study on the influence of the amplitude of ultrasonic vibration on the radial deflection of drill point at the start of drilling and its effect on hole accuracy and drill life have been conducted. Finally a new variable amplitude vibration drilling method is presented.
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