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Study of Mechanical Vibration Aided Submersed Gas- Jetting Edm

Author: LiLinZuo
Tutor: KangXiaoMing
School: Shanghai Jiaotong University
Course: Aviation Aerospace Manufacturing Engineering
Keywords: EDM fluid jet Mechanical vibration Material removal rate Tool electrode wear rate Energy distribution coefficient
CLC: TG661
Type: Master's thesis
Year: 2012
Downloads: 21
Quote: 0
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EDM method of gas as the working medium gas harmful to humans, do not pollute the environment, low electrode wear, simplify processing. However, such a processing method in a discharge gap is small, the short-circuit is high, the machining state instability. The proposed solution the EDM method based on gas jet EDM technology has made great progress in recent years. Under the same processing conditions, liquid jet EDM than the gas in the spark machining in a higher material removal rate, the surface quality is better. However, the liquid the jet ignition processing there is a lack of the absolute value of the material removal rate is still low. High-speed translational assisted liquid jet EDM obtained 35.2mm3/min the material removal rate, electrode wear was processed by the conventional liquid jet spark almost zero soared to 40%. For the liquid jet EDM not high material removal rate and low electrode wear problem, this paper presents the mechanical vibration assisted liquid jet EDM method. In this method of processing during the workpiece is fixed to the vibrating work bench, and with its vibration. Is designed and produced a voice coil motor vibration workbench, optimize the operating parameters of the vibrating table, when the vibration frequency of 300Hz, the amplitude of 22.4μm, jet EDM solution can not only improve the material removal rate also be able to improve the quality of the machined surface. The pulse width, pulse interval, the peak current, the gas pressure, the electrode rotational speed and other parameters on the liquid jet EDM performance under vibration assisted. Experimental results show that, when a pulse width of 400μs, pulse for 10μs, the peak current is 30A, the gas pressure of 0.2MPa, the electrode rotation speed of 1500rpm, the material removal rate can reach 45mm3/min, the electrode wear rate is almost zero and does not change with the change of the processing parameters. Therefore, the mechanical vibration assisted liquid jet spark machining not only improve the performance of a liquid jet EDM, but also maintain the advantage of the electrode loss is close to zero. The article also conducted a preliminary analysis of extremely liquid jet EDM energy distribution law. Single pulse experiments and numerical simulations to study the relationship between the energy distribution coefficient of the workpiece and the pulse width and peak current. When the pulse width and peak current hour, the workpiece energy distribution coefficient Fa is greater, 0.3; When the pulse width and a large peak current, the workpiece energy distribution coefficient was 0.4. The electrode the pits radius laboratory numerical simulation method is basically the same. Laid the foundation for this study to reveal the mechanism of discharge of the liquid jet EDM.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal cutting and machine tools > Special machine tools and processing > Electric machines and their processing
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