Near-mirror-finish phenomenon in EDM using powder-mixed dielectric

Thermal erosion theory is widely accepted as an explanation of the erosion process in electro-discharge machining (EDM) Theoretical models are based on the solution of the transient heat conduction equation, which is modeled considering suitable assumptions with appropriate initial and boundary conditions The closed form solutions result only after considering too many assumptions, which are far from actual machining conditions The growth of the plasma channel, energy sharing between electrodes, process of vaporization, formation of recast layer, plasma-flushing efficiency, and temperature sensitivity of thermal properties of the work material are a few physical phenomena that render the machining process highly complex and stochastic The mathematical consideration of all these complex phenomena is very difficult Therefore, mathematical prediction of material removal rate when compared with the experimental results shows wide variation In such circumstances, an attempt has been made to deve

Artificial neural network prediction of material removal rate in electro discharge machining

About the Role of Debris in the Gap During Electrical Discharge Machining

Semi-empirical model of efficiency of wire electrical discharge machining of hard-to-machine materials

In this study, experiments were performed to determine parameters effecting surface roughness (SR) along with structural analysis of surfaces with respect to material removal parameters. Experimental work was conducted on EN-31 tool steel with copper, brass and graphite as tool electrodes with kerosene oil as dielectric fluid. The data compiled during experimentation has been used to yield responses in respect of material removal rate (MRR) and SR. Detailed analysis of structural features of machined surface was done by using Scanning Electron Microscope (SEM) and optical microscope to understand the mode of heat affected zone (HAZ), which alternatively affects structure of machined workpiece and hence tool life. While investigating electric discharge machining (EDM) surface by micrographs, it was observed that molten mass has been removed from surface as ligaments and sheets. In some cases, it is removed as chunks, which being in molten state stuck to surface. All three specimens machined by different electrodes showed different pattern of HAZs.

http://nopr.niscair.res.in/bitstream/123456789/2537/1/JSIR%2067%2812%29%201072-1077.pdf

Analysis of electro discharge machined surfaces of EN-31 tool steel

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/pdf/an-introductory-investigation-of-the-breakdown-mechanism-in-4co7ge2blh.pdf

An introductory investigation of the breakdown mechanism in electro-discharge machining

/pdf/some-further-research-on-the-breakdown-mechanism-in-electro-15lt78cp3h.pdf

H.J.A. Horsten

Papers

An introductory investigation of the breakdown mechanism in electro-discharge machining

Some further research on the breakdown mechanism in electro-discharge machining