Dr. Yongbin Zhang Profile

Dr. Yongbin Zhang

at China Academy of Engineering Physics

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Publications (3)

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Proceedings Article | 13 November 2019 Paper

Spindle parallelism adjustment technology based on discharge sensing

Weiran Yuan, Yongbin Zhang, Guangmin Liu, Bo Hu, Jianyuan Li

Proceedings Volume 11343, 1134324 (2019) https://doi.org/10.1117/12.2552239

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For precise micro-EDM machine tools with high-speed pneumatic spindle, the parallelism between the axis of rotation and the existing Z axis directly determines the machining accuracy of tool electrode and workpiece, so it is necessary to adjust the parallelism between the rotary axis of the pneumatic spindle and the Z axis. Due to the small diameter and low rigidity of the tool electrode, the traditional contact metering method is difficult to apply. Therefore, based on the principle of micro-energy pulse discharge sensing, the diameter and center coordinates of the tool electrode are measured in different tool electrode sections, and the tilt between the pneumatic spindle and the Z-axis is calculated. Based on principle, the posture of the spindle is fine-tuned. This can easily and quickly adjust the parallelism between the pneumatic spindle and the Z-axis. Finally, the parallelism error of the measuring section is successfully controlled within 0.0015 mm.

Proceedings Article | 13 November 2019 Paper

Study on discharge states detection method of VHF micro-EDM pulse generator used in polishing of optoelectronic device

Qi Jing, Yongbin Zhang, Jian Li, Guangmin Liu, Fang Ji

Proceedings Volume 11343, 1134323 (2019) https://doi.org/10.1117/12.2552016

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The gap average voltage measurement method is commonly used to detect the discharge state in micro electrical discharge machining (Micro-EDM), which is simple and effective for the discharge states detection of transistor pulse power and relaxation type pulse power. In order to further explore the ultimate machining ability of micro-EDM, a very high frequency (VHF, frequency range 30MHz~300MHz) micro energy pulse generator based on the principle of circuit resonance has been developed in a previous study. It has smaller discharge energy and nanoscale discharge erosion ability compared with the traditional pulse power. Furthermore, defects in micro-EDM such as thermal damage, recast layer and heat affected zone are significantly reduced. A simulation circuit model was established to analyze the effect of the gap average voltage measurement method applied to VHF pulse generator. The results show that the inter-electrode discharge states cannot be distinguished effectively and sensitively by this means. In order to detect the discharge state of VHF pulse generator, a novel method to detect discharge state based on impedance change of inter-electrode channel was presented, which is not affected by the pulse power. Hence, when the detection circuit was fixed, the detection sensitivity and the accuracy of threshold voltage was not varied according to different pulse parameters. Both simulation and experimental studies were undertaken to verify the effectiveness of the proposed method. The results demonstrate that the discharge states of VHF pulse generator can be distinguished by this detection method.

Proceedings Article | 13 November 2019 Paper

Micro-milling cutter precise tool setting technology based on discharge sensing

Bo Hu, Yongbin Zhang, Jian Li, Weiran Yuan, Jianyuan Li

Proceedings Volume 11343, 1134322 (2019) https://doi.org/10.1117/12.2551662

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In micro-milling, the diameter of the micro-milling cutter is smaller than tens of microns, making it difficult to achieve precise positioning with the workpiece, which affects the machining accuracy and the safety of the micro-milling cutter. To solve these problems, the coordinate system has been analyzed. A micro-milling precise automatic tool setting technology has been proposed, which based on the micro-energy pulse discharge sensing principle. A tool setting scheme is proposed to determinate the Central coordinates of workpiece, which is realized by repeating automatically the precise sense from four directions. Experiment is carried out to verify the feasibility and correctness of the technology by analyzing the perceived results.

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