Ultrasonic vibration (USV) and magnetic field (MF) complex assisted techniques are combined with low speed wire electrical discharge machining (USV-MF complex assisted WEDM-LS) to improve the machining performance of conventional WEDM-LS. Firstly, the simulation results of multi-physical coupling simulation model show that under the influence of ultrasonic vibration, the working fluid fluidity is greatly enhanced and its temperature is significantly decreased. Then, a three-phase flow model of bubble, working fluid and debris in the machining area is established to investigate the effects of ultrasonic vibration on bubble and debris, and the process of bubble rupture is simulated. The simulation results show that with the increase of ultrasonic frequency, the movement of bubble and debris becomes fiercer and fiercer, when ultrasonic frequency is 30 kHz and ultrasonic amplitude is 10 μm, the bubble is collapsed. Finally, comparison of the experimental results of conventional WEDM-LS, USV assisted WEDM-LS, MF assisted WEDM-LS and USV-MF complex assisted WEDM-LS in machining TiNi-01 shape memory alloy reveals that the ratio of normal discharge and the material removal rate are both increased, the workpiece surface roughness value is decreased and the workpiece surface quality is improved in the process of USV-MF complex assisted WEDM-LS.

超声振动（USV）和磁场（MF）复杂辅助技术与低速金属丝放电加工（USV-MF复杂辅助WEDM-LS）相结合，以提高传统WEDM-LS的加工性能。首先，多物理场耦合仿真模型的仿真结果表明，在超声振动的影响下，工作流体的流动性大大提高，温度明显降低。然后，建立了加工区域内气泡，工作流体和碎屑的三相流模型，以研究超声振动对气泡和碎屑的影响，并模拟了气泡破裂的过程。仿真结果表明，随着超声频率的增加，气泡和碎屑的运动越来越激烈，当超声频率为30 kHz，超声幅度为10μm时，气泡破裂。最后，比较传统的WEDM-LS，USV辅助的WEDM-LS，MF辅助的WEDM-LS和USV-MF复杂的辅助WEDM-LS加工TiNi-01形状记忆合金的实验结果表明，正常放电比与在USV-MF复合辅助WEDM-LS工艺中，材料去除率均提高，工件表面粗糙度值降低，工件表面质量得到改善。