Paweł Kogut

Designing the 40 kHz Piezoelectric Sandwich Type Ultrasonic Transducer

Ultrasonic sandwich type transducers (also known as Langevin transducers) are widely used in welding and cutting systems. The efficiency of such system is particularly important due to the increasing interest in the ultrasonic welding field. Optimal design of the transducer allows meeting those requirements. Designing process requires considering problems of the material selection, geometry optimization, and mechanical endurance. During the past years many aspects of the designing and manufacturing process have been studied, however, there is little information about the transducer aging. Aging has shown that stress relaxation after bolt prestressing had significant influence on its final transducer parameters. Authors conclude that optimal design of the transducer with FEM and analytical analysis yields experimental results with good convergence after proper assembling and aging. Since transducer parameters are strongly influenced by the bolt stiffening and aging authors claim that corrections of the dimensions should be done on a relaxed transducer.