Vibration Characteristics of a Wire-Bonding Ultrasonic Horn

와이어 본딩용 초음파 혼의 진동 특성

  • Kim, Young Woo (Dept. of Mechanical Engineering, Sogang Univ.) ;
  • Yim, Vit (Dept. of Mechanical Engineering, Sogang Univ.) ;
  • Han, Daewoong (Dept. of Mechanical Engineering, Sogang Univ.) ;
  • Lee, Seung-Yop (Dept. of Mechanical Engineering, Sogang Univ.)
  • 김영우 (서강대학교 기계공학과) ;
  • 임빛 (서강대학교 기계공학과) ;
  • 한대웅 (서강대학교 기계공학과) ;
  • 이승엽 (서강대학교 기계공학과)
  • Received : 2013.11.09
  • Accepted : 2014.01.29
  • Published : 2014.02.01


This study investigates the vibration characteristics of a wire-bonding piezoelectric transducer and ultrasonic horn for high-speed and precise welding. A ring-type piezoelectric stack actuator is excited at 136 kHz to vibrate a conical-type horn and capillary system. The nodal lines and amplification ratio of the ultrasonic horn are obtained using a theoretical analysis and FEM simulation. The vibration modes and frequencies close to the driving frequency are identified to evaluate the bonding performance of the current wire-bonder system. The FEM and experimental results show that the current wire-bonder system uses the bending mode of 136 kHz as the principal motion for bonding and that the transverse vibration of the capillary causes the bonding failure. Because the major longitudinal mode exists at 119 kHz, it is recommended that the design of the current wire-bonding system be modified to use the major longitudinal mode at the excitation frequency and to minimize the transverse vibration of capillary in order to improve the bonding performance.


Supported by : 한국연구재단


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