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Open AccessArticle

Study on a Large-Scale Three-Dimensional Ultrasonic Plastic Welding Vibration System Based on a Quasi-Periodic Phononic Crystal Structure

by Jiyan Lin 1,2 and Shuyu Lin 1,*
1
Shaanxi Key Laboratory of Ultrasonics, Shaanxi Normal University, Xi’an 710119, Shaanxi, China
2
School of Information Engineering, Yulin University, Yulin 719000, China
*
Author to whom correspondence should be addressed.
Crystals 2020, 10(1), 21; https://doi.org/10.3390/cryst10010021
Received: 24 December 2019 / Revised: 27 December 2019 / Accepted: 31 December 2019 / Published: 3 January 2020
The uniformity of amplitude distribution and amplitude gain are two main factors affecting the performance of ultrasonic welding vibration system. In order to improve the uniformity of amplitude distribution and amplitude gain of welding surface to enhance the performance of the vibration system, a new design method of a large-scale three-dimensional ultrasonic plastic welding vibration system based on a quasi-periodic phononic crystal structure is proposed. In this method, the composite horn combined with a conical section and a cylindrical section can effectively improve the output amplitude gain of the welding surface. In addition, the method forms a quasi-periodic phononic crystal structure by slotting in a large-scale three-dimensional tool head, and utilizes the band gap property of the structure to effectively suppress lateral vibration of the tool head and improve the amplitude distribution uniformity of the tool head’s welding surface. However, when the size of the tool head is relatively large, the quasi-periodic phononic crystal structure cannot suppress the lateral vibration very well. Therefore, the paper processes fan-shaped slopes on the output surface of the tool head which can further improve the uniformity of the amplitude distribution and amplitude gain. Finally, the simulation analysis and experiments show that the design method can optimize the large-scale three-dimensional ultrasonic plastic welding system, improve the uniformity of the vibration distribution and increase the output amplitude gain of the welding surface. View Full-Text
Keywords: quasi-periodic phononic crystal; fan-shaped slopes; uniformity of amplitude distribution; composite horn; amplitude gain quasi-periodic phononic crystal; fan-shaped slopes; uniformity of amplitude distribution; composite horn; amplitude gain
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Lin, J.; Lin, S. Study on a Large-Scale Three-Dimensional Ultrasonic Plastic Welding Vibration System Based on a Quasi-Periodic Phononic Crystal Structure. Crystals 2020, 10, 21.

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