Abstract In this study, a novel complex technique of ultrasonic vibration (USV) and magnetic field (MF) assisted WEDM-LS (USV-MF complex assisted WEDM-LS) is proposed to enhance the machine characteristics and then to investigate the effects of the main process parameters on the MRR and surface quality including surface roughness (SR) in machining thick shape memory alloy TiNi-01. The principle and schematic diagram of the USV-MF complex assisted WEDM-LS machining setup are analyzed firstly. The vibration state simulation analysis of wire electrode in USV assisted WEDM-LS and USV-MF complex assisted WEDM-LS under different machining parameters were carried out in the paper. Then the simulation analysis of distribution of the discharge points on wire electrode in USV-MF complex assisted WEDM-LS shows the distributions of discharging points become more uniform reducing the broken electrode wire caused by the concentration of the discharge point of the electrode wire. The establishment of process parameters (MRR and Ra) models is finished and verified by experiments. Comparison of the experimental results of only MF assisted, USV-MF complex assisted and conventional WEDM-LS reveals that when process parameters are selected in the appropriate range, USV-MF complex assisted can significantly improve the ratio of normal pulse discharge states, increase the machining efficiency and improve surface quality simultaneously, reducing Ra. The proposed USV-MF complex assisted WEDM-LS process presents enormous advantages and potential for applications in the practical machining and manufacturing field.

中文翻译：

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超声振动与磁场复合辅助电火花线切割机-LS厚形状记忆合金工件机理及关键技术研究

摘要 在这项研究中，提出了一种新的超声振动 (USV) 和磁场 (MF) 辅助 WEDM-LS (USV-MF complex 辅助 WEDM-LS) 复合技术来增强机器特性，然后研究其影响。加工厚形状记忆合金 TiNi-01 时 MRR 和表面质量的主要工艺参数包括表面粗糙度 (SR)。首先分析了USV-MF复合辅助WEDM-LS加工装置的原理和示意图。文中对USV辅助线切割机床和USV-MF复合辅助线切割机床在不同加工参数下的电极振动状态进行了仿真分析。然后对USV-MF复合辅助电火花线切割机电极丝上放电点分布的仿真分析表明，放电点分布更加均匀，减少了由于电极丝放电点集中引起的断丝现象。完成了工艺参数（MRR和Ra）模型的建立并通过实验验证。仅MF辅助、USV-MF复合辅助和常规WEDM-LS的实验结果比较表明，当工艺参数选择在适当范围内时，USV-MF复合辅助可以显着提高正常脉冲放电状态的比率，增加同时提高加工效率和提高表面质量，降低Ra。