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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2021, Vol. 42 ›› Issue (10): 524914-524914.doi: 10.7527/S1000-6893.2020.24914

• Article • Previous Articles     Next Articles

Optimization of magnetorheological finishing process for aluminum mirror with complex surface

XU Chao1,2, HU Hao1,2, PENG Xiaoqiang1,2, LI Xinlei1,2, LIN Zhifan1,2   

  1. 1. Laboratory of Science and Technology on Integrated Logistics Support, National University of Defense Technology, Changsha 410073, China;
    2. College of Intelligent Science and Technology, National University of Defense Technology, Changsha 410073, China
  • Received:2020-10-22 Revised:2020-11-16 Published:2020-12-25
  • Supported by:
    Science Challenge Project (TZ2018006); National Natural Science Foundation of China (51835013)

Abstract: The complex curved surface aluminum mirror processed by ultra-precision turning can only meet the application requirements of the infrared optical system. To meet higher application requirements, it is necessary to further improve the shape accuracy of the reflector. Magnetorheological finishing has unique advantages in complex surface machining as it can be used for deterministic shape modification. However, the continuous change of complex surface shape will lead to instability of removal function and affect the error convergence efficiency and machining accuracy. In this paper, according to the requirements for application of the high-precision complex curved surface aluminum mirror, a dynamic modeling method of MRF removal function in local area of complex surface is proposed, and solution to the dwell time algorithm is given. Based on the principle of minimum average curvature change, a polishing path optimization algorithm is developed. To solve the problem of slow calculation speed of the algorithm, the optimization strategy is put forward. Experiments verifies that the shape error of the finally obtained complex curved surface aluminum mirror is 0.216λ PV and 0.033λ RMS (λ=632.8 nm).

Key words: complex curved surface, aluminum reflector, surface accuracy, magnetorheological finishing (MRF), path optimization

CLC Number: