脉冲电流大厚度电解线切割加工试验

doi:10.7527/S1000-6893.2018.22781

Abstract

Abstract: Precision and high surface integrity machining of thick rule structures in aerospace difficult-to-cut materials has become a common concern and an urgent problem in the manufacturing field. Pulse Wire ElectroChemical Machining (PWECM) has principal advantages in applications requiring high surface integrity. This paper discusses the effects of workpiece thickness on PWECM using the circuit model. Experimental results show that the electrolyte resistance, the inter-electrode voltage, and machined slit width were reduced with the increase of workpiece thickness. While the time constant of electric double layer in PWECM increases, the charging voltage including the effective machining time decreases. When the pulse frequency is greater than 20 kHz, the maximum electrode feedrate rapidly decreases with the increase of the frequency. When the pulse frequency is lower than 20 kHz, the difference of the maximum machining rate becomes smaller. Finally, a fir-tree-like turbine-disk tenon/mortise structure of 20 mm in thickness is successfully fabricated at the pulse frequency of 20 kHz and the electrode feed rate of 4 μm/s, and the surface roughness Ra was about 0.449 4 μm. The surface quality and machining efficiency at 20 kHz is significantly superior to that at 100 kHz.

Key words: pulse electrochemical machining, wire electrochemical machining, workpiece thickness, pulse frequency, electrode feedrate

CLC Number:

V261.5

CHEN Mi, FANG Xiaolong, ZHU Di. Experimental research on pulse current wire electrochemical machining of thick structures[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019, 40(8): 422781-422781.

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Experimental research on pulse current wire electrochemical machining of thick structures

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