Electrical discharge machining is a method of removing metal using an electric sparks, similar to a plasma cutter but on a much smaller scale and under water. A resistance capacitance relaxation circuit is used in an electrical discharge machining process. Recently I have been finishing this project by making a better structure for the linear actuation, adding labels to the controls and other miscellaneous items. Ultrasonic machining is a subtractive manufacturing process that removes material from the surface of a part through high frequency, low amplitude vibrations of a tool against the material surface in the presence of fine abrasive particles. This set of Manufacturing Processes Multiple Choice Questions & Answers (MCQs) focuses on “Wire-cut EDM – 3”. All are on Manufacturing technology exam questions. Manufacturing Knowledge Menu EDM Manufacturing Services EDM Manufacturing Equipment. The origin of electrical discharge machining goes back to 1770, when English scientist Joseph Priestly discovered the erosive effect of electrical discharges. Machine tools were among the innovations that made mass production and interchangeable parts realities in the 19th century. In ECM, the shaped tool is made out of. After completing the questions look at the answers and verify with yours. The electrical discharge machining also called as. 2 depicts the electro-chemical reactions schematically. Basic equipment: electro-discharge machine tool. 1. The capacitance (in μ F) in the circuit is Electrochemical grinding is a process that removes electrically conductive material by grinding with a negatively charged abrasive grinding wheel, an electrolyte fluid, and a positively charged workpiece. d) Any of the above . You can find the answers at last. The history of EDM Machining Techniques goes as far back as the 1770s when it was discovered by an English Scientist. Electrical discharge machining (EDM), also known as spark machining, spark eroding, die sinking, wire burning or wire erosion, is a metal fabrication process whereby a desired shape is obtained by using electrical discharges (sparks). This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “EDM-Applications – 1”. d) 5 to 25 Volts . (2017). a) 5 to 10 Volts. b) Copper. Main features: Able to process materials which is difficult to be cut by conventional machining method and complex-shaped workpieces. b) Sparkless discharge machining. ). Heat from Moreover, EDM allows users to machine hardened workpieces. Another optional EDM technique is the electrical discharge grinding where a conventional internal grinding machine is used the grinding stone of which is a conductor material (brass, graphite) playing Introduction to Manufacturing and Machining; Basic working principle, configuration, specification and classification of machine tools Founded in 1980 to provide a specialist sub-contract Wire and Spark erosion service to the engineering industry. a) Brass. The original target market was the West Midlands region of the United Kingdom, now our customer base is the whole of the UK, we also export our services to … - The Ultrasonic Machining has various industrial applications due to its safe and noiseless operation. He was an English physicist. - The tool used in USM process is made of soft material and oscillated at the frequencies of the order 20-30 kHz. In ECM, DC power supply is in the range of. Q11. a) Complex shapes b) Simple shapes c) All of the … As the material removal takes place due to atomic level dissociation, the machined surface is of excellent surface finish and stress free. Wire electric discharge (ED) machining is based on the same principle as that of _____ a) hydro-dynamic EDM b) die-sink EDM c) polar EDM d) non-conventional EDM View Answer Machining without cutting force; No defects such as burrs and tool marks and grooves, etc. Electrical Discharge Machining, EDM is one of the most accurate manufacturing processes available for creating complex or simple shapes and geometries within parts and assemblies. In plunge grinding (A) The work is reciprocated as the wheel feeds to produce cylinders longer than the width of wheel face (B) The work rotates in a fixed position as the wheel feeds to produce cylinders equal to or shorter than the width of wheel face (C) The work is reciprocated as the wheel feeds to produce cylinders shorter than the width of wheel face Electrical Discharge Machining (EDM) is a process that uses electrical discharges emitted from an electrode to erode an electrically conductive material. 14. It shows presence of agglomeration of fine ZrB2 particles in the Cu matrix. Fig. c) 5 to 20 Volts. Electro-Discharge . - USM tool oscillates normal to the … Wire electrical discharge machining (WEDM) uses a metallic wire to cut or shape a workpiece, often a conductive material, with a thin electrode wire that follows a precisely programmed path. It was first observed in 1770 by Joseph Priestley. on the tool, only hydrogen gas evolves at the tool or cathode. Investigation on machining copper plates with NiP coated tools using tailor-made micro-electro discharge machine. In electro discharge machining, cutting tools are usually made of; 1) High speed steel; 2) Tool steel; 3) Carbide-tipped tool; 4) Graphite - 7234270 Electrical discharge machining produces surfaces with a fine finish and high precision. Application of new tool material for electrical discharge machining 403 tion of ZrB2 particles in Cu matrix and beyond this level hardness decreases with the increase of Cu (soft phase) addition. 4, pp. UNIT III ELECTRICAL ENERGY BASED PROCESSES 8 Electric Discharge Machining (EDM)- working Principle-equipments-Process Parameters- Surface Finish and MRR- electrode / Tool – Power and control Circuits-Tool Wear – Dielectric – Flushing – Wire cut EDM – Applications. 1. EDM works by eroding material in the path of electrical discharges that form an arc between an electrode tool and the work piece. a) Spark erosion machining. 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. However, Electrical Discharge Machining was not fully taken advantage of until 1943 when Russian scientists learned how the erosive effects of the technique could be controlled and used for machining purposes. Homemade EDM (Electric Discharge Machining) Machine I made the majority of this homemade EDM a long time ago. 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). 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. 522-538. Which of the following shapes can be produced using Electro discharge machining? Q9. Later on in the 1940's Soviet researchers developed a machining process that formed the foundation for modern day EDM. Typically the electrode diameters range from .004″ – .012″ (.10mm – .30mm), although smaller and … Materials removed from the workpiece stay in the electrolyte fluid. Machine tool, any stationary power-driven machine that is used to shape or form parts made of metal or other materials. Laser-assisted electric discharge machining is a hybrid process of combining both laser beam machining (LBM) and electro-discharge machining (EDM) in order to address the problems associated with the both EDM and laser. c) Bronze. Electrical discharge machining is a machining technique principally used for hard metals and metals that are difficult to machine using traditional methods. Q10. This test contains 50 questions with 4 answers you have to choose the right answers and count your score. 3, No. Learn more about the tools… In EDM machine the material is removed by rapidly recurring (repeating) discharges of current in between the electrodes. Whereas other machining techniques need to be executed before the workpiece is hardened with heat treatment, electrical discharge machining can be applied on the hardened material as well. Advances in Materials and Processing Technologies: Vol. Electrical Discharge Machining & Automation. The tool (the wire) is usually made of copper, brass or tungsten and of outside diameter 0.25 mm. Electrical discharge machining (EDM) is a machining method primarily used for hard metals or those that would be impossible to machine with traditional techniques. b) 5 to 15 Volts. Electrical Discharge Machining EDM is the thermal erosion process in which metal is removed by a series of recurring electrical discharges between a cutting tool acting as an electrode and a conductive workpiece, in the presence of a dielectric fluid. Main limitations of EDM are longer machining times, high tool wear. Classification of Metal Removal Processes and Machine tools. The process of automating one or more EDM machines is similar to that of other conventional machine tools. The SEM images of sintered samples are shown in figure 5. The basic EDM process is an electrical spark that is created between an electrode and a work piece. The tool travels vertically or orthogonal to the surface of the part at amplitudes of 0.05 to 0.125 mm (0.002 to 0.005 in. The discharge voltage is 100 V. At a spark cycle time of 25 μs the average power input required is 1 kW. This discharge occurs in a voltage gap between the electrode and workpiece. Therefore, it is possible to erode or “burn “electrically the reverse shape of the electrode into the work piece. Electric Discharge Machining. Advanced Machining Process - Mechanical Engineering (MCQ) questions and answers Home >> Category >> Mechanical Engineering (MCQ) questions and answers >> Advanced Machining Process 1) The Laser Beam Machining process can be carried out, when the media for energy transfer between tool … “Generally, workpieces are mounted on a pallet system and the automation changes the pallets in and out of a chuck on the machine… Machine tool - Machine tool - Electrical-discharge machining (EDM): EDM involves the direction of high-frequency electrical spark discharges from a graphite or soft metal tool, which serves as an electrode, to disintegrate electrically conductive materials such as hardened steel or carbide. This is also known as electro-discharge erosion. 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