Mehdi Zarei - Department of Mechanical Engineering, Tarbiat Modares University (TMU),Tehran , Iran
Gholam Reza Faghani - Department of Mechanical Engineering, Khatam Al Anbia Air Defense UniversityTehran, Iran
Mahmood Farzin - Department of Mechanical Engineering, Isfahan University of Technology Isfahan
Mohammad Mashayekhi - Department of Mechanical Engineering, Isfahan University of Technology Isfahan

In ultrasonic tube hydroforming, the tube is hydro formed while the ultrasonic vibration is applied to the die. Prior studies provide experimental proof that ultrasonic tube hydroforming reduces corner radius, improves lubrication and uniform thickness. Use of ultrasonic vibration can decrease friction at the tube-die interface. Few attempts have been made to analyze the wire drawing while the ultrasonic vibrations were also applied during the processes. A detailed analysis and understanding of the mechanism of improvement is not possible with conventional experimental observation because the ultrasonic vibration processing phenomenon occurs at high speed. Therefore, we attempt to understand the processing mechanism of ultrasonic tube hydroforming using the finite element method (FEM).ABAQUS was used for the FEM. Forming force and formability in tube hydroforming analyzed. From these studies, we quantitatively clarified the mechanism of improved formability characteristics, such as decreased forming load and increasing bulging diameter

Tube hydroforming, Ultrasonic oscillation, Finite element method, Bulging process