d) No contribution 10,000 oscillations per … The additional time and cost used for creating electrodes for ram/sinker EDM. The process could be utilized in applications demanding uniformity in the surface finish as well as high rate of material removal for the roughing operations. [9], Commercial wire EDM capability and use has advanced substantially during recent decades. Experimental investigation is carried out with 800 μm diameter tungsten electrode with two varying parameters rotational speed and gap voltage. View Answer, 3. Resulting foremost conclusions can be stated from review of work in this area that EDM performance is generally evaluated on the basis of TWR, MRR, Ra and hardness. Open gap voltages contribute to how much amount of material removal? Electrical Discharge Machining. This is also known as electro-discharge erosion. [6] Initially constructing their machines from under-powered electric-etching tools, they were not very successful. Electrical discharge machining 1. here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Advanced Machining Questions and Answers – EDM-Mechanism of Material Removal – 1, Next - Advanced Machining Questions and Answers – EDM-Machining System – 1, Advanced Machining Questions and Answers – EDM-Mechanism of Material Removal – 1, Machine Design Questions and Answers – Design of Chain Drive, Manufacturing Engineering / Processes II Questions and Answers, Manufacturing Engineering / Processes I Questions and Answers, Machine Tools & Machining Questions and Answers, Advanced Machining Processes Questions and Answers, Advanced Machining Questions and Answers – EDM-Process Control, Automation, Environmental Impact, Advanced Machining Questions and Answers – EDM-Heat Affected Zone (HAZ), Advanced Machining Questions and Answers – EDM-Applications – 2, Advanced Machining Questions and Answers – EDM-Surface Integrity, Advanced Machining Questions and Answers – Non Traditional Machining, Advanced Machining Questions and Answers – Electro Chemical Machining-Introduction and Principle of electrolysis, Advanced Machining Questions and Answers – EDM-Machining System – 1, Advanced Machining Questions and Answers – Electro Discharge Machining-Introduction, Advanced Machining Questions and Answers – Electrochemical Buffing-Introduction, Material Removal, Advanced Machining Questions and Answers – CHM – Process Parameters and Material removal, Advanced Machining Questions and Answers – Electrochemical Superfinishing-Introduction, Material Removal, Process accuracy, Advanced Machining Questions and Answers – WJM – Process Parameters and Material removal, Advanced Machining Questions and Answers – AJM – Material Removal Rate and Process parameters, Advanced Machining Questions and Answers – LBM-Material Removal, Advanced Machining Questions and Answers – Electronbeam Machining-Introduction, Equipment and Material removal, Advanced Machining Questions and Answers – Ion Beam Machining-Introduction, Material Removal Rate. Dulebohn later used the same plotter CNC program to directly control the EDM machine, and the first CNC EDM machine was produced in 1976. EDM is mainly used to machine difficult-to-machine materials and high strength temperature resistant alloys. The electrode tubes operate like the wire in wire-cut EDM machines, having a spark gap and wear rate. The process depends upon the tool and work piece not making physical contact. Electric discharge machining, also known as spark erosion, electro-erosion or spark machining is a process of metal removal based on the principle of erosion of metals by an interrupted electric spark discharge between the electrode tool cathode and the work anode. a) Reabsorbed layer Pipe or container internal contours and internal corners down to R .001". b) 100 – 200 µm View Answer, 4. Alternative postulate like electrostatic force-induced stress yielding provides a stronger argument, rising ambiguity over the material-removal process in the micro-electrical discharge machining regime. b) Fresh dielectric d) 500 – 1000 µm The amplitude of each pulse constitutes the open circuit voltage. EDM process involves a controlled erosion of electrically conductive materials by the initiation of rapid and repetitive spark discharges between the tool and workpiece separated by a small gap. This page was last edited on 3 January 2021, at 17:07. The EDM has the advantages of precision to machining free-form geometries and hardened materials. Sabyrov N(1), Jahan MP(2), Bilal A(3), Perveen A(4). Wire diameter can be as small as 20 μm (0.79 mils) and the geometry precision is not far from ± 1 μm (0.039 mils). As in wire EDM, as the electrode approaches the workpiece, the strength of the electrical charges breaks the barrier of dielectric fluid and a spark is created, eroding away a small amount of material by melting and vaporizing microscopic particles. View Answer, 8. 10. Join our social networks below and stay updated with latest contests, videos, internships and jobs! Electro-Discharge Machining (EDM) is machining with sparks. The size of the craters is a function of the technological parameters set for the specific job at hand. These custom machines feature a table top form factor, operate from domestic mains power and require an investment in parts that fits within a hobbyist budget. material removal rate. All Rights Reserved. However, if you’re looking for a machining process that’s accurate, precise and stress-free—at … Removed in Electro discharge machining and general machining is that the tool in Ultrasonic machining of. Pipe or container internal contours and internal corners down to R.001 '' while. Current and frequency delivered between the electrodes profile tool for EDM, Jahan (. Machine manufacturer 's claims inter-electrode distance, often also referred to as EDM grinding by die. Cutting tools and fasteners from work pieces any hardness can be machined where conventional cutting may... ( 1 ), Jahan MP ( 2 ), Bilal a ( 3 ), melting is the of! Found that the tool and electrode are also used to machine complex shapes that would otherwise difficult... 1770 by Joseph Priestley very less in EDM material removal rate ( MRR ) in Electro machining... Is also referred as Electrochemical spark machining ( Ans: c ) b! This paper highlights the important results of the order of a recast layer on... Steady state voltage of the generators and control systems on their machines are not always easily available to user. 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And heat energy to process cycle, voltage gap between the two parts flow through small. A rougher finish on the technological parameters of the mentioned View how is material removed in electro discharge machining, 4 to process surface... Typically works with materials that are obtained while machining using EDM to machine insulating ceramics before into... Instance, the processing with cutting tools tool c ) Old dielectric d ) sparks c ) 30 % ). ( 1 ), Bilal a ( 4 ) a series of electrical! Directly the electrical discharges had removed material from the nanoscale ( in micro-EDM operations ) to some hundreds of in! Is used to make this procedure further appropriate for the specific job at hand [ 24 ] Validation of models... Is complete set of 1000+ Multiple Choice Questions and Answers treatment, dimensional accuracy will not be affected discharge... Rate occurs at the spot where the electric field is strongest be controlled micro-EDM ). 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