There exist four basic non-traditional machining processes (EDM, LBM, EBM, and PAM) where thermal energy is utilized to melt and vaporize a tiny volume of material from the workpiece. MECHANISM OF MATERIAL REMOVAL The first serious attempt of providing a physical explanation of the material removal during electric discharge machining is that of Dijck [48]. PROCESS PARAMETERS (CONTD..,) 29 Taper cut & over cut Prevention of Taper Cut Insulated 30. Engineering. Electrical Discharge Machining is a one of the electrical energy based Unconventional Machining ... Workpiece during the process of EDM. Comment. Physics Questions & Answers for AIEEE,Bank Exams,CAT, Analyst,Bank Clerk,Bank PO : The mechanism of material removal in EDM process is He was an English physicist. Li et al. a) Evaporation b) Fresh dielectric c) Old dielectric d) All of the mentioned Sintered NdFeB permanent magnet is widely used in many applications because of its excellent magnet property. The machinability and the material removal mechanisms were discussed of Fcc-TiBCN block in wire-cut EDM. 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. The workpiece is typically cut from a larger piece of stock, which is available in a variety of standard shapes, such as flat sheets, solid bars, hollow tubes, and shaped beams. mechanism of the material removal in micro-EDM, ... Electrical Discharge machining (EDM) is a comparatively new machining method which has several decades of history with efficient work flow. Surface finish produced will be better. Disadvantages: Used only for electrically conductive material. In EDM machine the material is removed by rapidly recurring (repeating) discharges of current in between the electrodes. Electrical discharge machining is one of the earliest nontraditional machining, extensively used in industry for processing of parts having unusual profiles with reasonable precision. to material removal in form of debris which is continuously being flush off by the dielectric. Electrical Discharge Machining (EDM) consists of a non-conventional machining process, which is widely used in modern industry, and especially in machining hard-to-cut materials. UNIT-III Two Marks Questions with Answers 1. Ans. 3. work piece tool Fig. [5] presented that superheating is the dominant mechanism for the material removal in EDM. 7. 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. 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. From literature review, Ultrasonic vibration technique is identified as the potential area of work to be pursued further. Figure 4: Process parameters and performance measures of EDM Process 2. 2. Then the block material was machined by wire-cut EDM. In this paper, a comparative study of magnetic field–assisted electrical discharge machining (MF-EDM) has been conducted to process magnetic and non-magnetic materials. material removal coupled with a reduction in tool wear and improved surface quality. The mechanism of material removal in EDM process is . It was first observed in 1770 by Joseph Priestley. By employing EDM, complex shapes and geometries can be produced, with high dimensional accuracy. In this research attention is focussed on the analysis … Eubank et al. 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). Electrical Discharge Machining (EDM) is a non traditional machining and electro thermal process in which material from the workpiece is removed by using electrical discharges (sparks). In his Ph.D. thesis, he presented physico-mathematical analysis of the process. This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “EDM-Mechanism of Material Removal – 2”. 1. Material Removal Mechanism. Aptitude Data Interpretation Verbal Reasoning Non Verbal Reasoning Verbal Ability Programming General Knowledge Puzzle. Academic Resource. Research on other as-pects, for instance, the tool electrode performance and spark generate mechanism will be introduced in next paper. The response parameters identified through the Literature Review are Material Removal Rate (MRR), Gap Voltage ... Material Removal Rate (MRR) 3 Schematic representation of crater formation in EDM process. The first serious attempt of providing a physical explanation of the material removal during electric discharge machining is perhaps that of Van Dijck.Van Dijck presented a thermal model together with a computational simulation to explain the phenomena between the electrodes during electric discharge machining.However, as Van Dijck himself admitted in his study, … PROCESS PARAMETERS (CONTD..,) material removal in a single spark can be expressed as the energy content of a single spark is Material removal rate: 28 Tool Spark Crater 29. Molecular dynamics simulation of material removal process and mechanism of EDM using a two-temperature model Highlights•This paper achieved a sub-micron MD simulation of discharge process using TTM.•This paper revealed one of material removal mechanisms in EDM.•The formation process of denatured layer in the discharge process was studied.AbstractMolecular dynamics (MD) simulation … 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 … In electrical discharge machining (EDM), the working medium plays an important role in the material removal process. D. Cavitations and Evaporation. piece material, electrode material is the input parameters for EDM. 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. Lots of methods have been utilized to study this process, but a widely accepted explanation about this process has not been yet accomplished. B. Melting and Corrosion. Figure 2 Material removal mechanism in EDM process Important parameters of EDM The important parameters of Electrical discharge machining process are as listed below: a. However the report of EDM research on NdFeB magnet is not available. It is also known as spark erosion , electro-erosion or spark machining. Please do not use … and mechanism of material removal in EDM. C. Erosion and Cavitations. 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. Although mechanism of material removal is same in all four processes, the source of heat is different. Spark On-time (pulse on time or Ton): The duration of time The paper reports research on EDM relating to improvement in MRR along with some insight into mechanism of material removal. EDM experiments. And in this paper,it is mainly aimed at the study of the material removal mechanism. Electrical discharge machining is basically a non-conventional material removal process which is widely used to produce dies, punches and moulds, finishing par… Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. : 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. Explain the purpose of dielectric in EDM process. The Electrical Discharge Machining process is employed widely for making tools, dies and other precision parts. After the explosion is over, how is the debris carried away? Firstly, a series of MF-EDM experiments on selected magnetic material (SKD11) and selected non … Assisted magnetic field is an important technique, successfully applied to electrical discharge machining process. Download App. Servo Mechanism is used to provide a constant gap between the gaps. Fcc-TiBCN powder synthesized by boronizing of Ti was pressured into monolithic block by hot pressing (HP) method. This paper explores the mechanism of wire EDM of MMCs with different sizes of reinforced particles as well as the corresponding unreinforced matrix material. In the present study, the material removal mechanism is … Two different mechanisms have been proposed to analyze the material removal viz., electro-mechanical analysis for moval mechanism of G-ECDM is still unclear. Analysis of material removal and surface generation mechanism of ultrasonic vibration–assisted EDM September 2020 International Journal of Advanced Manufacturing Technology 110(1-2) It is normally used for mass production and is used for working extremely hard materials or materials that are difficult to machine using conventional methods. Ultrasonic vibration–assisted EDM (UEDM) has excellent performance on difficult-to-machine materials processing such as titanium alloy, stellite, and nickel-based alloy, and it was hard to describe the material removal process and surface generation mechanism due to the complex physiochemical reactions during UEDM. A. Melting and Evaporation. Electrical discharge machining (EDM) has long been the answer for high accuracy, demanding machining applications where conventional metal removal is difficult or impossible. This paper presents a detailed investigation of the material removal mechanisms of sintered NdFeB magnet through analysis of the machining debris and the surface SEM quality. Correct Answer : A. Such heating leads to melting and crater formation as shown in Fig. €e electrical erosion resistance of the surface material is enhanced, and the sidewall wear of the electrode can be e‚ectively reduced, and the shape accuracy of the machined hole can be greatly improved [11]. Electrochemical machining (ECM) is a method of removing metal by an electrochemical process. EDM – MATERIAL REMOVAL RATE 27 28. Share this question with your friends. Results show that the machinability of Fcc-TiBCN is satisfying. Electric discharge machining is a controlled metal removal process that is used to remove metal by means of electric spark erosion. The mechanisms of material removal, surface generation, and taper kerf formation were investigated. Its use is limited to electrically conductive materials. 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