Study on Threaded Joints in Ultrasonic Vibration System

The Case where Threaded Joints Are Located between Transducer and Horn

Abstract

The threaded joints, located between transducer and horn in the ultrasonic vibration system, affect vibrational characteristics. The report deals with threaded joints experimentally, taking the accuracy of screw thread and tightening torque, as well as measuring method of the perpendicularity of the screw thread axis to contact surface. As a result, the resonant frequency of screw thread with high accuracy is almost equal to the theoretical one. The larger the tightening torque is, the higher the Q factor becomes. Screw thread with low accuracy reveals modes other than the expected ones, and its vibrational characteristics can be improved by use of stud bolts.