Study on the effective discharge energy mechanism of vertical ultrasonic vibration assisted EDM processing
Study on the effective discharge energy mechanism of vertical ultrasonic vibration assisted EDM processing
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DOI：
10.1177/09544054211028527
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发表时间：
2021-07
期刊：
影响因子：
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通讯作者：
Yinghuai Dong;G. Li;Yan Wang;Jianbao Song;Shuo Yang;Haiyang Yu
中科院分区：
文献类型：
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作者：
Yinghuai Dong;G. Li;Yan Wang;Jianbao Song;Shuo Yang;Haiyang Yu
与传统电火花加工相比，超声振动辅助电火花加工在优化放电环境方面有很大的进步。在这项研究中，超声波振动连接到电极。根据电极尖端运动路径与放电间隙的相对位置关系，定义了UEDM的四种工作状态。四种工作状态分别是放电间隙内的路径、与放电间隙的边缘接触的路径、放电间隙外的电极端部路径的一部分以及与工件接触的路径。从有效放电能量和放电频率两个方面对放电状态进行了分析。建立了两种常用工作状态下有效放电能量和表面粗糙度的数学模型。通过实验验证了理论研究的正确性。实验结果表明，超声振幅对超声能量的影响是主要的，而频率的影响是次要的。当电极端路径与放电间隙的边缘接触时，具有更好的放电稳定性和更高的放电能量的工作状态。在前三种常规加工状态下，工件表面质量随超声振幅和频率的增加而提高。该研究可为UEDM的参数匹配提供科学指导。
Compared to traditional EDM processing, UEDM (Ultrasonic Vibration Assisted EDM) have a great improvement in optimizing discharge environment. In this study, ultrasonic vibration is attached to the electrode. According to the relative positional relationship between the movement path of the electrode tip and the discharge gap, four working states of UEDM are defined. The four working states are the path within the discharge gap, the path in contact with the edge of the discharge gap, part of the electrode end path outside the discharge gap, and the path in contact with the workpiece, respectively. States are analyzed from the effective discharge energy and discharge frequency. A mathematical model for effective discharge energy and surface roughness is established for two conventional working states. The correctness of the theoretical research is verified by experiments. As the experiment results shown, the influence of ultrasonic amplitude on the energy of UEDM is primary, while frequency is secondary. A working state with better discharge stability and higher discharge energy when the electrode end path is in contact with the edge of the discharge gap. In the first three conventional machining states, the surface quality of the workpiece increases with the increase of ultrasonic amplitude and frequency. The study can provide scientific guidance for parameter matching of UEDM.