Magnetic field-assisted EDM (MAEDM) 2. Academic Resource. Interviewmania is the world's largest collection of interview and aptitude questions and provides a comprehensive guide to students appearing for placements in India's most coveted companies. Module-3: ADVANCED MATERIAL REMOVAL PROCESSES Lecture No-9 Electrical Discharge Machining (EDM) It is an advanced machining process primarily used for hard and… EDM can cut intricate contours or cavities in pre-hardened steelwithout the need for heat treatment to soften and re-harden them. The material removal mechanism of WEDM is very similar to the conventional EDM Process involving the erosion effect of produced by the electrical discharge (sparks). Then again, when micro-holes, micro-slots and micro-molds. - In Electro-Chemical Machining (ECM) process, the metal removal is carried out by electrosysis Watch Queue Queue. Non-conventional machining processes may use chemical or thermal means of removing material. Question: 1. The mechanism of material removal in EDM process is. Log in. (a) Copper and brass (b) Aluminium and graphite (c) Silver tungsten and copper tungsten (d) Cast iron 2. Consequently, the material removal mechanism in EDM can be explained in two ways: one by vaporization and the other by the explosion of bubbles generated in the material. EDM is mainly used to machine difficult-to-machine materials and high strength temperature resistant alloys. Join now. Magnetic field-assisted abrasive flow machining (MAAFM) Micromanufacturing Lab, I.I.T. The mechanism of material removal in EDM process is - 18798051 The mechanism of material removal in EDM process is A) Erosion and Cavitations B) Cavitations and Evaporation C) Melting and Evaporation D) Melting and Corrosion Report Error
Download App. Watch Queue Queue. Mechanism of Material Removal in EDM In EDM, for a particular machining condition there are numerous phenomena involved, i.e., heat conduction and radiation, phase changes, electrical forces, bubble formation and collapse, rapid solidification etc. Explain. Accordingly, these regions seem to be playing an important role in the removal phenomena of the molten metal on the EDM process; that is, it is concluded that the molten metal in the crater might be removed in the form of small particles from the workpiece showing the same removal mechanism as the case of mercury electrode. Comment. It also involves direct energy dissipated in the EDM process… Electrical discharge machining is one of the earliest nontraditional machining, extensively used in industry for processing of parts having unusual profiles with reasonable precision. Besides, there See the answer. In EDM machine the material is removed by rapidly recurring (repeating) discharges of current in between the electrodes. The material is removed from a workpiece, without any mechanical force on the workpiece using an electrical current that passes between an electrode and a workpiece, which is separated by a dielectric liquid. The mechanism of material removal in EDM process is . making. 1/Issue 3/2013/0001) zones (HAZ) of the workpiece … CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): The aim of this paper is to study the Electro discharge machining process. What is the range of frequencies of sound waves audible to human beings? INTRODUCTION Electro Discharge Machining (EDM) is an electro-thermal non- traditional machining process, where electrical energy is used to generate electrical spark and material removal mainly occurs due to thermal energy of the spark. Material removal from molten metal was observed in order to investigate the material removal mechanism in the electrical discharge machining (EDM) process. machining/finishing process by the addition (assistance) of magnetic field with the aim to improve workpiece surface quality and material removal rate. Spalling is the main mechanism … It also involves direct energy dissipated in the EDM process… In Electrical discharge machining; a potential difference is applied across the tool and w/p in pulse form. Download App. Modelling of Material Removal and Product Quality Material removal in EDM mainly occurs due to intense localised heating almost by point heat source for a rather small time frame. The separation space between both electrodes (gap) where the spark takes place is a fundamental process characteristic. This video is unavailable. EDM process is based on thermoelectric energy between the work piece and an electrode. EDM is used to machine intricate profiles, small diameter drillings and hard materials [1]. Electrical discharge machining, or EDM, is a non-traditional method in which material is removed from a workpiece using thermal energy. 7. Advanced Machining Questions and Answers – EDM-Mechanism of Material Removal – 1 « Prev. Academic Resource. Material removal rate occurs at the spot where the electric field is strongest. Achieving an efficient MRR is not simply a matter of the right machine settings. The Material Removal Rate Of EDM Process Increases With (select All That Apply): A.Decrease In The Melting Temperature Of The Workpiece Material, Tm B.Increase In The Discharge Current, I C.Voltage D.Increase In The Melting Temperature Of The Workpiece Material, Tm E.Decrease In The Discharge Current, I 2. Yet, the effects of various process parameters on the material removal rate (MRR) and the resulting surface topography are not well understood. Photographs are taken with an image converter camera or with a single still camera. Machining is a term used to describe a variety of material removal processes in which a cutting tool removes unwanted material from a workpiece to produce the desired shape. Electrical Discharge Machining (EDM) is a non-traditional machining process. complexity of material removal mechanism taking place in EDM make it even more difficult to select machining condition. Out of all the unconventional machining methods, EDM is the one which gives highest MRR, Melting and evaporation is the mechanism for chip formation, the mechanical properties of work piece material will not affect the material removal rate (MRR). INTRODUCTION Electro Discharge Machining (EDM) is an electro-thermal non- traditional machining process, where electrical energy is used to generate electrical spark and material removal mainly occurs due to thermal energy of the spark. In EDM (electric discharge machining ) the mechanism of Material Removal is Melting and vaporization aided by the cavitations, also called s view the full answer Previous question Next … 1. In the present work, an attempt has been made to model material removal rate, electrode wear rate, and surface roughness through response surface methodology in a die sinking EDM process. Electrical Discharge Machining & Automation. 1. Figure 1. Material removal is mainly due to the presence of thermodynamic forces. This problem has been solved! The mechanism of material removal in EDM process is (a) Melting and Evaporation (b) Melting and … After the explosion is over, how is the debris carried away? This video is unavailable. Next Question. Behaviors of liquid metal (mercury) caused by a transient arc discharge in water (The maximum current is about 125 A of which duration is about 68μs) are studied in relation to the removal mechanism of the electrical discharge machining (EDM). Discussion; Pankaj Chaugule -Posted on 19 Nov 15 - In Electrical Discharge Machining (EDM) process, the metal removal is carried out by melting and vaporization as there is a controlled erosion between two electrically conducting materials, the tool and the workpiece. These results indicate that removal can occur without the help of dielectric liquid [16] . EDM has been an important manufacturing process for the tool, mould, and dies industries for several decades. Electrical discharge machining is a machining method primarily used for hard metals or those that would be very difficult to machine with traditional techniques. Then again, when micro-holes, micro-slots and micro-molds. Metal removal rate is usually expressed as cubic inches per hour (in3/hr), but in fact could just as realistically be expressed as $/hr. Known by many other names, including spark machining, arc machining and (inaccurately) burning, the EDM process is conceptually very simple: an electrical current passes between an electrode and a workpiece which are separated by a dielectric liquid. Electro-discharge machining (EDM) is indisputably an electro-thermal process that removes material from the work surface through the action of repetitive discrete electrical sparks produced by a direct current (DC) pulse generator between the two electrodes (tool and workpiece) separated by a small distance (gap) while being immersed in a dielectric liquid medium. The mechanism of material removal in edm process is evaporation Ask for details ; Follow Report by Preetgill721 25.04.2018 Log in to add a comment Much like processes such as laser cutting, EDM does not need mechanical force in the removal process. In the present work, an attempt has been made to model material removal rate, electrode wear rate, and surface roughness through response surface methodology in a die sinking EDM process. The mechanism of material removal in EDM process is a) Melting and Evaporation b) Melting and Corrosion c) Erosion and Cavitations d) Cavitations and Evaporation However, in most researches on the machining mechanism of micro-EDM, only the thermal action is concerned. Please do not use … T… Material removal is mainly due to the presence of thermodynamic forces. 1. What is the value of order of frequency applied between the two electrodes in EDM? This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “EDM-Mechanism of Material Removal – 2”. Ask your question. In the heat transfer mechanism, heat conduction is known to be the main major mode. Since the early seventies, researchers worldwide have attempted to model the electric discharge phenomena (plasma channel) and the mechanism of cathode and anode erosion in the EDM process. and mechanism of material removal in EDM. Lots of methods have been utilized to study this process, but a widely accepted explanation about this process has not been yet accomplished. It was first observed in 1770 by Joseph Priestley. Two different mechanisms have been proposed to analyze the material removal viz., electro-mechanical analysis for Watch Queue Queue The tool and workpiece must be electrically conductive and a small gap is maintained in between them. SUMMARY In this paper, review of EDM research work related to MRR improvement has been presented along with some insight into the basic EDM process and material removal mechanism. and mechanism of material removal in EDM. Then the block material was machined by wire-cut EDM. Physics Questions & Answers for AIEEE,Bank Exams,CAT, Analyst,Bank Clerk,Bank PO : The mechanism of material removal in EDM process is The optimization was performed in two steps using one factor at a time for preliminary evaluation and a Box-Behnken design involving three var… The mechanism of material removal in EDM process is - 18798051 1. In electrical discharge machining (EDM), the working medium plays an important role in the material removal process. Firstly, a series of MF-EDM experiments on selected magnetic material (SKD11) and selected non … Previous Question The mechanism of material removal in EDM process is, Materials Science and Manufacturing Engineering, Materials Science and Manufacturing Engineering Miscellaneous. In micro-electrical discharge machining (micro-EDM), the discharge duration is ultra-short, and both the electric action and the thermal action by the discharge channel play important roles in the removing process of cathode material. … surface. Comment. Next » ... Material Removal, Process accuracy ; advertisement. EDM can be used to machine difficult … Log in. The process of automating one or more EDM machines is similar to that of other conventional machine tools. Electrochemical machining (ECM) is a non-traditional material removal process proposed by Gussef in 1929 that creates a contoured shape on a workpiece by means of controlled anodic dissolution of metals. Achieving an efficient MRR is not simply a matter of the right machine settings. B. Melting and Corrosion. The machining process in electrical discharge machining (EDM) consists of a melting process and a removal process. There are three material removal mechanisms of TiBCN conductive ceramic in the EDM machining process: spalling, melting and evaporation. If the distance is reduced to one-fifth, then the force between them is, A wooden block of mass m1 kg accelerates at m/s when a force of 5 N acts on it. Correct Answer : A. 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