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EDM milling based on a 6-DOF serial robot

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Abstract

Aiming at the problems of insufficient flexibility and limited size of the workpiece in traditional EDM milling, an EDM milling based on a 6-DOF serial robot is proposed in this study. To realize the rapid adjustment of the machining gap, a tool electrode servo motion device was invented and installed at the end of a 6-DOF serial robot, and a servo control strategy of the tool electrode vertical trajectory fallback was proposed. Then, to achieve the controllable thickness of every layer in EDM milling based on a 6-DOF serial robot, the servo control strategy of limited motion of the tool electrode on the basis of vertical servo control and a fix-length compensation method to compensate the tool electrode wear was proposed. Finally, to verify the correctness and effectiveness of the servo control strategy and wear compensation of the tool electrode, the trapezoidal groove structures on the plane workpiece and cylindrical workpiece were machined by EDM milling based on a 6-DOF serial robot, respectively. Also, to verify the machining ability of complex trajectories on the space surface of the workpiece of EDM milling based on a 6-DOF serial robot, three complex trajectories, such as EDM, Chinese character “China,” and “Chinese knot,” was designed and machined on the hemispherical workpiece with the radius of 38 mm. The feasibility and effectiveness of EDM milling technology based on a 6-DOF serial robot were verified, which has great market application potential.

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Funding

The authors would like to thank the National Natural Science Foundation of China (no. 51905311).

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Authors and Affiliations

  1. School of Mechanical Engineering, Shandong University, Jinan, 250061, China

    Xiaoming Yue, Zhiyuan Chen & Zuoke Xu

  2. School of Instrument Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

    Jing Liu

Authors
  1. Xiaoming Yue
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  2. Zhiyuan Chen
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  3. Zuoke Xu
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  4. Jing Liu
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Contributions

Xiaoming Yue: conceptualization, investigation, validation, visualization, writing—original draft, and funding acquisition. Zhiyuan Chen: data curation and visualization. Zuoke Xu: formal analysis and methodology. Jing Liu: project administration, supervision, resources, and writing—review and editing.

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Correspondence to Jing Liu.

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Yue, X., Chen, Z., Xu, Z. et al. EDM milling based on a 6-DOF serial robot. Int J Adv Manuf Technol 123, 1905–1912 (2022). https://doi.org/10.1007/s00170-022-10275-3

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  • DOI: https://doi.org/10.1007/s00170-022-10275-3

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