关键词: 热塑性纤维金属层合板, 超声振动, 宽刃工具头, 结构参数优化, 频率偏移补偿

Abstract:

In order to meet the functional requirements of the ultrasonic vibration assist integrated heating/molding processes（UVAIMPs） of thermoplastic FMLs for a variable-dimensional ultrasonic machining system， a novel design method by cooperating the frequency offset compensation with stepwise hierarchical optimization was put forward. After the stepped wide blade ultrasonic sonotrode designed by using the above method was assembled with the specified ultrasonic generator and transducer， the corresponding vibration characteristics were measured with a laser vibrometer. The results show that the above sonotrode may operate stably at a resonance frequency of 20 101 Hz. Under the 50% output power of ultrasonic generator， the maximum vibration displacement reaches 16 μm on end faces and 12.7 μm on lateral faces under the condition that the amplitude uniformity is larger than 90%， and the corresponding effective working regions are 110 mm×30 mm and 110 mm×16 mm. Thus， the sonotrodes with both of end and side working faces are realized to satisfy the demands of the variable-dimensional ultrasonic machining system for UVAIMPs of thermoplastic FMLs. The present work verifies the feasibility and effectiveness of the proposed design method.

Key words: thermoplastic fiber metal laminate（FML）, ultrasonic vibration, wide blade sonotrode, structural parameter optimization, frequency offset compensation