Ultrasonic vibration drilling of small-diameter holes on glass

2^nd Report : Evaluation of cutting tool behavior during ultrasonic assisted drilling and machined surface roughness

Abstract

This study focused on an ultrasonic assisted machining method for high-precision hole processing in glass materials. To elucidate the machining phenomena peculiar to this method, tool behavior analysis at the start of drilling using a high-speed camera and surface roughness of the inner surface of the hole were examined. The results indicated that the helical shape is due to the centripetal action at the tip of the drill and brittle fracture of the work material. We propose a method to calculate the theoretical surface roughness from a computer simulation model of the surface properties when this method is used. Comparison of the estimated values and values measured using this method indicated that the tendency of surface roughness almost matched.