scholarly journals Machining and Surface Characteristics of AISI 304L After Electric Discharge Machining for Copper and Graphite Electrodes in Different Dielectric Liquids

2017 ◽  
Vol 7 (4) ◽  
pp. 1765-1770
Author(s):  
S. Anjum ◽  
M. Shah ◽  
N. A. Anjum ◽  
S. Mehmood ◽  
W. Anwar
Keyword(s):  
Electric Discharge ◽  
Electrode Material ◽  
Electrode Materials ◽  
Dielectric Liquid ◽  
Electric Discharge Machining ◽  
Graphite Electrodes ◽  
Aisi 304L ◽  
Dielectric Liquids ◽  
Morphological Studies ◽  
Thermal Conductivities

In Electric Discharge Machining (EDM), the thermal energy used for material erosion depends on the intensity of electric sparks, the thermal conductivities of electrode material and the dielectric liquid. In this paper, the effect of EDM on AISI 304L steel is studied using copper and graphite electrodes and distilled water and kerosene oil as dielectric liquids. Material Removal Rates (MRR), Tool Wear Rates (TWR) and surface conditions are calculated for four different combinations with the two electrode materials and the two dielectric liquids. These investigations are carried out at different pulse currents. Machined surfaces are evaluated by morphological studies, energy dispersive spectrographs (EDS) and white layer thickness using Scanning Electron Microscopy (SEM). It is found that a transfer of carbon takes place from the kerosene oil and the graphite electrodes into the machined surface which alters the metallurgical characteristics, depending on the electrical and thermal conductivities of the electrode material and the dielectric liquid.

Electrode Material Effect on Electrical Discharge Machining PcBN Cutting Tool Processing

2011 ◽  
Vol 399-401 ◽  
pp. 1667-1671 ◽  
Author(s):  
Yun Hai Jia
Keyword(s):  
Surface Quality ◽  
Electric Discharge ◽  
Electrode Material ◽  
Electrical Discharge ◽  
Electrode Materials ◽  
Cutting Tool ◽  
Electrical Discharge Machining ◽  
Copper Electrode ◽  
Electric Discharge Machining ◽  
Tool Surface

The electrode material is playing the very important role in the electrical discharge machining. Two kinds of electrode materials common used in EDM are compared and analyses similarities and differences in structure and physical characteristics. Combined with PcBN tool machining tests, from the electric discharge machining efficiency, electrode wear, tool surface quality, tool surface degenerating layer, machining results are in analysis and comparison, and then different electrode materials machining technics in electrical discharge machining process are summarized. Through the cutting tool electric discharge machining experiments, we can know that the graphite electrode easy to take shape, suits in the complex edge's cutting tool electric discharge machining, under the same electric discharge machining parameter condition, its processing efficiency must be higher than the copper electrode, but the electrode loses, the cutting tool surface quality and affect layer thickness are to be worse than the copper electrode.

SKD 61 Material Surface Treatment with Electric Discharge Machining Using Cu, CuCr & Graphite Electrodes and Dielectric Fluid Jatrophacurcas

2013 ◽  
Vol 789 ◽  
pp. 307-312
Author(s):  
Triyono ◽  
Dedi Priadi ◽  
Eddy S. Siradj ◽  
Winarto
Keyword(s):  
Surface Treatment ◽  
Electric Discharge ◽  
Removal Rate ◽  
White Layer ◽  
Material Surface ◽  
Dielectric Fluid ◽  
Electrode Wear ◽  
Electric Discharge Machining ◽  
Graphite Electrodes ◽  
Edm Process

The emergence of white layer in each process of Electric Discharge Machining (EDM) becomes the focus of attention of the experts. It is harder than the base metal would be advantageous to withstand friction engine components, such as the plastic molding industry. From various studies it has been reported that the increase in the value of hardness of white layer either due to migration of the electrode material and dielectric fluid to the white layer. This paper discusses the influence of electrodes Cu, CuCr and graphite as well as jatrophacurcas dielectric fluid to the surface of the material SKD 61, microhardness of the white layer, Tool Wear Rate (TWR) of Material Removal Rate (MRR), Surface roughness (Ra) and the microstructure. Initial studies conducted are the transesterification and characterization of jatrophacurcas to determine the dielectric strength and the content of metal elements. Furthermore, the EDM testing is done to dies steel of SKD 61 using the electrodes of Cu, CuCr and Graphite. The use of jatrophacurcas yield the best MRR when using Graphite electrodes followed Cu last CuCr. While the smallest TWR produced by Cu electrode, CuCr and then the highest is Graphite. The relative wear which is the ratio TWR with MRR, for the three types of electrodes is always great at a small current then decreases and then tends to be stable with the increase of electric current. Jatrophacurcas for the three types of electrodes provide higher TWR than kerosene. This means that migration of materials is beneficial because larger material, but in terms of the geometric accuracy of the product can lead to decreasing of dimensional tolerances. Vickers hardness values of white layer is achieved by CuCr electrodes, Graphite lowest. Microstructural observation results of EDM white layer using graphite electrodes produce a more uniform thickness than the white layer using Cu and CuCr electrodes. The conclusion of this study that jatrophacurcas can be used as a dielectric fluid in EDM process, because electrode wear during EDM process is relatively high compared with kerosene that is mean more profitable in the surface treatment process of dies steel of SKD 61.

Effect of Materials on the Mechanism of Electric Discharge Machining (E.D.M.)

1983 ◽  
Vol 105 (2) ◽  
pp. 132-138 ◽  
Author(s):  
A. Erden
Keyword(s):  
Electric Discharge ◽  
Particle Concentration ◽  
Electrode Materials ◽  
Tool Material ◽  
Mathematical Expression ◽  
Machining Process ◽  
Time Lags ◽  
Machining Performance ◽  
Electric Discharge Machining ◽  
Workpiece Material

Electric Discharge Machining process is investigated both theoretically and experimentally to determine the effects of electrode materials on the machining performance. For this purpose a single and isolated spark is physically and mathematically modelled, and its three phases; viz., Breakdown, Discharge and Erosion are investigated. Resolidified electrode materials as suspended particles in the dielectric liquid are found to be the most significant factor in the breakdown phase. Mathematical expressions relating the time lags to particle concentration are given which can be used to determine the effects of particle concentration on the machining performance. Discharge properties are shown to be dependent on the discharge medium which includes vapours of the electrode materials. The polarity effect has been studied both theoretically and experimentally. Some qualitative explanation is given for the erosion phase. Importance of electrical forces is discussed and a simple mathematical expression is given for the erosion phase. It is concluded that optimum machining conditions can only be obtained by proper selection of the tool material, workpiece material and discharge medium since they affect the initiation and development of the discharge and erosion of electrode materials.

Experimental Analysis of Canola Oil as Dielectric Fluid in Electric Discharge Machining of AISI D2 Steel

2020 ◽  
Vol 978 ◽  
pp. 49-54
Author(s):  
Kusumba Mangapathi Rao ◽  
D. Vinay Kumar ◽  
K.Chandra Shekar ◽  
Balasubramaniyan Singaravel
Keyword(s):  
Electric Discharge ◽  
Canola Oil ◽  
Removal Rate ◽  
Dielectric Liquid ◽  
Dielectric Fluid ◽  
Work Piece ◽  
Electrode Wear ◽  
Electric Discharge Machining ◽  
Plasma Generation ◽  
Aisi D2

Electric Discharge Machining (EDM) is a thermo-electrical disintegration process, utilized to cut hard materials into complex shapes. In EDM, the three vital components are work-piece material, electrode material and dielectric liquid. The significant function of the dielectric fluid is to produce a breakdown voltage for creating a spark between work-piece and electrode. This spark creates ionization by plasma generation and it expels the material from work-piece. In most cases, hydrocarbon-based dielectric liquid is preferred in the EDM process. This kind of dielectric liquid generates hazardous gases which are harmful to people, environment and ecological balances. In this experiment, Canola oil is utilized and the outcomes are compared. The input parameters are Pulse on/off time, current and gap voltage. Copper, Brass and Tungsten-Copper (Alloy) are used as electrodes. The output values from the experiments are Surface Roughness (SR), Electrode Wear Rate (EWR) and Material Removal Rate (MRR). The outcomes demonstrated that Canola oil-based dielectric fluid has comparable properties of conventional based dielectric fluid. This Canola based dielectric gives more prominent MRR value than EDM oil-based dielectric liquid and furthermore higher EWR and SR values are recorded. The proposed Canola oil-based dielectric fluid is biodegradable and has improved suitability in machining.

scholarly journals Graphite Electrodes in Electric Discharge Machining

1974 ◽  
Vol 23 (249) ◽  
pp. 464-469 ◽  
Author(s):  
Kanji MATSUO ◽  
Toru HOSHIKAWA ◽  
Toshio SAKASHITA
Keyword(s):  
Electric Discharge ◽  
Electric Discharge Machining ◽  
Graphite Electrodes
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