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| Experimental Investigation on Wire Electrode Electrochemical Machining Square Slotted Torsional Spring |
| TANG Cheng1 , FANG Xiaolong1 , XU Chongchang2 , ZENG Yongbin1 |
| (1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China; 2. AVIC Tianjin Aviation Electro–Mechanical Co., Ltd., Tianjin 300308, China) |
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Abstract Square slit torsion springs are widely used in various types of fighters and helicopters to trim steering gears, and their mechanical properties are significantly affected by manufacturing accuracy. Combination of low-speed rotation and linear feed to perform wire electrochemical machining square slotted torsional spring was proposed, analyzing its combined kinematics, designing a special motion device, and establishing a test system for wire electrochemical machining square slotted torsional spring. The experimental research on the electrochemical machining of the wire hole tube electrode to explore the influence of the feed speed and processing voltage parameters on the hole diameter and hole type was studied, and selecting the processing parameter with a feed speed of 0.6mm/min and a processing voltage of 14V, an array of machining holes with a hole diameter of 0.96mm is provided. The process of applying an insulating coating is used to avoid the corrosion of the non-machined surface of the torsion spring during the wire electrochemical machining process. The influence of the processing voltage on the feed speed is explored. Using optimized process parameters and improved process flow, a square slit torsion spring sample with an average slit width of 1.006mm, a size deviation of ±0.05mm, and a good surface quality was processed.
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2021, 
