Small-diameter drilling by ultrasonic vibration workpiece

– Effects of biting behavior and cutting edge wear –

抄録

Effects of chisel biting property improvement and cutting force reduction in the thrust direction have been reported for ultrasonic vibration (UV)-assisted drilling. This study was conducted confirm the effectiveness of UV-assisted drilling for a workpiece. We propose a new method "suitable ultrasonic vibration-assisted drilling (SUVD)" by which the UV condition is changed appropriately at the depth position, and examine the effects of SUVD. From observation of the chisel biting behaviour, the strain circle was clarified as generated when the relative speed to the chisel and the workpiece is less than 5 m/min. Furthermore, for UV-assisted drilling, the cutting edge wear increased about 1.8 times compared with that related to conventional drilling. However, it became equivalent by the application of SUVD.