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Simulation of Discharge Channelin Nano-Scale Electrical Discharge Machining

Author: ChenYin
Tutor: ZhaoWanSheng
School: Shanghai Jiaotong University
Course: Mechanical Manufacturing and Automation
Keywords: nano-EDM discharge channel plasma PIC
CLC: TG661
Type: Master's thesis
Year: 2012
Downloads: 39
Quote: 1
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Abstract


Study of nano-scale electrical discharge machining(nano-EDM) is ofgreat significance in the field of micro-machine manufacture and has beenregarded greatly by researchers home and abroad. Basic theoreticalresearch on nano-EDM is crucial to the prediction of electrodeconsumption and improvement of machining precision. Due to thecomplexity and randomness of discharging process as well as theinadequacy of present research methods, the progress of basic theoreticalresearch on nano-EDM is not very optimistic, delaying the development ofits technology. Computer simulation technology has brought new thoughtsfor researchers of nano-EDM, helping them overcome the scale andaccuracy limitations of traditional methods, thus making it easier to studyand discover the process and nature of nano-EDM.Using particle in cell method, take Monte Carlo collision model andsecondary electron emission model in to account, a model of dischargechannel is built. Forming process of discharge channel and the movementand distribution of the particles, as well as the changing process ofelectrical and magnetic fields in the channel during the discharging processare simulated and analyzed. By comparing the different simulation resultsof micro- and nano-EDM discharging channel, it is found that particles inplasma mainly show wave characteristics during micro-scale dischargingprocess. However, during nano-scale discharging process they displaymore particle characteristics.Experimental simulation is carried out on the nano-scale dischargingmodel, through which the existence of best breakdown pressure during a gas discharging process is verified. A STM-based discharging experimentunder atmospheric surrounding is also simulated, thus verifying the crucialinfluence of voltage difference between electrodes on ionization effects. Aspecial phenomenon is discovered during the simulation, that is, thediscontinuity of the ionization area along the discharge channel, which isdiscussed and explained using relevant theories of physics.

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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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