Study on Oscillatory Drilling Aiming at Prevention of Burr

Burr in drilling operations has been a serious problem especially in the area of factory automation and high technology. In order to prevent burr in drilling operations ultrasonic or low frequency vibration has been applied in the direction of drill feed. In this study in order to enhance the effect of oscillation in drilling operations newly developed “radial peripheral lip drill” has been applied as well as the standard type of drill. With the radial peripheral lip drill the radial lip at the corner of drill edge is able to obliquely cut and sharply slice the stock at the hole exit, which would become burr, by the aid of oscillatory motions in the direction of drill feed. Low frequency vibration is as highly effective in preventing burr as ultrasonic vibration except that the former is effective only with the radial peripheral lip drill.