Trajectory optimisation in electrical discharge machining of three-dimensional curved and twisted channels  

作　　者：Jianshe ZHAO Yicong QIU Jian YUAN Chao LIU 

机构地区：[1]College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China [2]Laboratory of Integrated Electrical Processing,Nanjing HANGPU Machinery Technology Company Limited,Nanjing 210000,China [3]Military Representative Bureau of the Air Force Equipment Department in Shanghai and Military Representative Office in Zhuzhou Region,Zhuzhou 412002,China [4]AECC South Industry Company Limited,Zhuzhou 412002,China

出　　处：《Chinese Journal of Aeronautics》2022年第4期473-484,共12页中国航空学报（英文版）

基　　金：financially supported by Aeronautical Science Foundation of China(No.2011ZE52055);Fundamental Research Funds for the Central Universities(No.3082018NF2018006)。

摘　　要：Numerical control electrical discharge machining(NC EDM) is one of the most widely used machining technologies for manufacturing a closed blisk flow path, particularly for three-dimensional(3D) curved and twisted flow channels. In this process, tool electrode design and machining trajectory planning are the key factors affecting machining accessibility and efficiency. Herein, to reduce the difficulty in designing the electrode and its motion path in the closed curved and twisted channels, a heuristic search hybrid optimisation strategy based on channel grids is adopted to realise the initial electrode trajectory design search and optimised size reduction. By transferring the trajectory optimisation constraints from the complex free-form surface to numbered grids, the search is found to be more orderly and accurate. The two trajectory indicators, namely argument angle and minimum distance, are analysed separately for the optimised results of the adaptive learning particle swarm optimisation algorithm, demonstrating that they can meet the actual processing requirements.Experimental results of NC EDM indicate that the motion path generated by this design method can meet the machining requirements of 3D curved and twisted flow channels.

关 键 词：BLISK Electrical discharge machining(EDM) Electrode Objective functions Trajectory generation 

分 类 号：V261.61[航空宇航科学与技术—航空宇航制造工程] TG661[金属学及工艺—金属切削加工及机床]