to material removal in form of debris which is continuously being flush off by the dielectric. piece material, electrode material is the input parameters for EDM. 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. Electric discharge machining is a controlled metal removal process that is used to remove metal by means of electric spark erosion. Disadvantages: Used only for electrically conductive material. Surface finish produced will be better. 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. Academic Resource. A. Melting and Evaporation. It is also known as spark erosion , electro-erosion or spark machining. The mechanisms of material removal, surface generation, and taper kerf formation were investigated. [5] presented that superheating is the dominant mechanism for the material removal in EDM. Spark On-time (pulse on time or Ton): The duration of time However the report of EDM research on NdFeB magnet is not available. UNIT-III Two Marks Questions with Answers 1. 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. 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. €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]. B. Melting and Corrosion. The paper reports research on EDM relating to improvement in MRR along with some insight into mechanism of material removal. 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. This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “EDM-Mechanism of Material Removal – 2”. Sintered NdFeB permanent magnet is widely used in many applications because of its excellent magnet property. Ans. This paper explores the mechanism of wire EDM of MMCs with different sizes of reinforced particles as well as the corresponding unreinforced matrix material. 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. C. Erosion and Cavitations. Correct Answer : A. 1. 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 … Eubank et al. Assisted magnetic field is an important technique, successfully applied to electrical discharge machining process. Although mechanism of material removal is same in all four processes, the source of heat is different. Gap Voltage ... Material Removal Rate (MRR) Aptitude Data Interpretation Verbal Reasoning Non Verbal Reasoning Verbal Ability Programming General Knowledge Puzzle. 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