What Are The Advantages And Disadvantages Of The EDM Process
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One of the major advantages of the EDM process is that there is very less tool wear. Since there is no physical contact between the tool and the workpiece, the tool wear due to other factors is very minimal. These other factors that can influence the tool wear include the machining parameters: such as the pulse frequency, duration of each electric pulse and the gap between two pulses, and the mean value of the electric intensity; the characteristics of the dielectric fluid, and the manner in which it accedes in the work zone; and also the characteristics of the workpiece material including the melting and vapourising temperatures, terms conductivity and thermal capacity. The overall electrode wear can be determined by calculating the change in its mass and dimensions.
Relating to tool wear, it was found that the tool/electrode wear is higher across the cross section of the tool than for the same along the length of the electrode. This can be attributed to the relative ease of heat transfer along the length of the…show more content… This will slow down the metal removal process.
• In the electrode —The machine may run smoothly while consuming as much electrode as workpiece. Electrode erosion cannot be completely eliminated, but it can be minimized by choosing the proper electrode material/work-metal combination and machining at the optimum settings.
Obviously, energy dissipated anywhere but in the workpiece is wasted and the greatest and most controllable losses are those which occur in the electrode. Generally, when cutting in positive polarity, the larger the particle size of the graphite electrode the faster the electrode will cut through the work metal. However, speed is not usually the only consideration when cutting cavities. As the amount of detail increases, the particle size of the graphite needs to decrease.