1. Suzhou University of Science and Technology, Suzhou 215009, China;
2. Suzhou Key Laboratory of Precision and Efficient Machining Technology, Suzhou University of Science and Technology, Suzhou 215009, China;
3. North University of China, Taiyuan 030051, China
Abstract：Ultrasonic vibration assisted electrical discharge (UVE), as a special composite machining technology, is one of the effective methods to improve the micro-holes machining performance of difficult-to-cut materials. In UVE micro-holes processing, according to the different forms of ultrasonic vibration, it can be divided into three modes: electrode vibration, workpiece vibration and dielectric vibration. In the UVE micro-hole processing of electrode vibration, the ultrasonic frequency is generally 20–40kHz, and the ultrasonic amplitude is about 5μm, which can improve the material removal rate by 40%–60%, and can machine the micro-hole with an aspect ratio of up to 30. In the UVE micro-hole processing of workpiece vibration, the ultrasonic frequency is mostly less than 30kHz and the ultrasonic amplitude is less than 10μm, and the material removal rate can be increased by about 40% and the micro-hole taper reduced by about 30%. In the UVE micro-hole processing of working fluid vibration, the ultrasonic frequency is generally greater than 40kHz, and the ultrasonic amplitude is greater than 5μm, which can increase the material removal rate by up to 33 times, and the hole wall roughness can reach R a 0.2μm. The research result of the three types of UVE micro-hole processing are summarized and analyzed, the three types of UVE micro-hole processing mechanisms and existing problems are discussed, and the characteristics and scope of application of the three types of UVE micro-hole processing are compared, and the development trends of UVE micro-hole processing were prospected.
2022, 
