Advantages and disadvantages edm is a method of machining parts that cannot be done by conventional machines. Knowledge in manufacturing technology i manufacturing technology ii engineering mechanics contact hours. Chandramouli s and eswaraiah k, modeling and optimization of electrical discharge machining process parameters using artificial neural networks, journal of material science and mechanical engineering, volume 2, number 5, 2015 pp. Electrical discharge machining used on hard metals works with electrically conductive materials 3. Material is removed from the work piece by a series of rapidly recurring current discharges between two electrodes, separated by a dielectric liquid and subject. Chandramouli s and eswaraiah k, optimization of electrical discharge machining. Lecture 19 electric discharge machining edm process lecture 20 diesinker edm and wire cut electric discharge machining wedm lecture 21 variant processes in edm lecture 22 electro chemical discharge machining ecdm lecture 23 laser beam machining lbm lecture 24 equipment and process parameters in lbm. The course introduces electrical machines namely transformers, dc and ac rotating machines, which are, arguably, the most important components of energy and power conversion industry. Non traditional manufacturing processes an overview. Mechanical engineering n p t e l national programme on. It works on the principle of faradays law of electrolysis.
Advanced electric discharge machining of stainless steels mdpi. Doi micro edmmicro electrical discharge machining is quite similar with the principals of electrical discharge machining. Introduction, mechanism of metal removal, dielectric fluid, spark generator, edm tools electrodes electrode feed control, edm process characteristics. Electric discharge machining working, advantages, uses with pdf. Edm is a thermal erosion process whereby material is melted and vaporized from an electrically conducive workpiece immersed in a liquid dielectric with a series. Grinding electrical discharge dressing utrasonic aided edm abrasive electrical discharge grinding micro electrical discharge machining micro wire edm mole edm double rotating electrodes edm when to use edm where deep cutting is required in unattended cutting for highexpertise. Electrical discharge machining edm is one of the most widely used non traditional. The spark is visible evidence of the flow of electricity. Transformers, being static, are the easiest of electrical machines and hence they will be dealt with initially after introducing magnetic circuit fundamentals. Wire electrical discharge machining wedm is a specialized thermal machining process capable of accurately machining parts with varying hardness or complex shapes, which have sharp edges that are.
Electrical discharge machining is a machining method primarily used for hard metals or those that would be very difficult to machine with traditional techniques. Nocarchitectural design of digital integrated circuits. The material removal takes place due to the melting and evaporation of. Introduction to nontraditional machining for iit kanpur. Machining is the manufacturing process by which parts can be produced to the desired dimensions. Lecture series on manufacturing processes ii by prof. Ultrasonic machining usm and waterjet machining wjm are typical examples of single action, mechanical non traditional machining processes. Transducer the high frequency electrical signal is transmitted to traducer which converts. Part 2 deals with thermal machining processes for example, electric discharge machining, laser beam machining, electron beam machining.
Eddy current and hysteresis loss factors on which it depends. The metal is eroded removed in exact amounts under controlled conditions. In this video we have explained working of electro discharge machining process, we have seen. Since the tool does not touch the workpiece, there are no cutting forces generated. Electrical discharge machining is a metalremoval process in which workpiece material is removed by electrical erosion. This is a manufacturing operation in which we used to make desired shapes by using an electrical spark. Electric discharge machining machining electromagnetism. Electric discharge machining working, advantages, uses. How an electrical discharge machining works engineers. Nptel online certification courses indian institute of technology kharagpur electrical machines ii assignment week 0 type of question.
Hello everyone welcome to engineers academy topics covered. Unit 12 week 10 electro discharge machining process. The numeric values in these problems, therefore, often may not be within a. As shown in the above steps, the tool is normally above the work piece and wired to the positive voltage, the work piece is in distilled water a dielectric fluid a liquid that doesnt. In electrical discharge machining edm process the metal removal is carried out by. Dry electrical discharge machining dedm is a type of green electrical discharge machining edm process where gas is used as the dielectric fluid instead of liquid 123. The basic electrical discharge machining process is really quite simple. Electrical discharge machining, or edm, shapes metal by creating sparks that melt tiny portions of the workpiece, and is an exceptionally diverse process tha. Electric discharge grinding, electric discharge diamond grinding, and wire electric discharge machining.
Electrochemical grinding, electrostream drilling, shaped tube electrolytic machining. The heattreated tool steels material falls in the difficulttocut material group when using conventional machining process. Electron beam machining ebm diagram, working, advantages. Edm spark erosion is the same as having an electrical short. 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. Russian scientist lazarenko 1 studied the electric discharge for metal cutting application and developed spark erosion machine in 1943. Electrical discharge grinding, plasma pdftk create pdf file arc machining, plasma assisted machining.
Edm is an effective technique in the production of micro components that are smaller than 100m. Taking leakage flux, winding resistances and core loss in the equivalent circuit of the transformer. Electrochemical machining ecm is a nontraditional machining process uses the principle of faraday to remove metal from the workpiece. Shantanu bhattacharya nptel coordinating institute. The main attraction of edm over traditional machining processes such as metal cutting using different tools and grinding is that this technique utilises thermoelectric process to erode undesired materials from the workpiece by a series of. This electric spark produces intense heat with temperatures reaching 8000 to 12000 degrees celsius. Ppt electrical discharge machining anil kumar academia. Introduction, diagram, parts, working, advantages, disadvantages, applications pdf electrochemical machining process, the combination of electrical energy and chemical energy makes the removal of material from the surface of a workpiece. Electric discharge machining is also known as edm which is a type of nontraditional machining process. Electrolysis is based on faraday laws of electrolysis which is stated as. Edm typically works with materials that are electrically conductive, although methods have also been proposed for using edm to machine insulating ceramics.
The machining medium is solid grains suspended in an abrasive slurry in the former,while a fluid is employed in the wjm process. Four forms of equipment are outlined to illustrate various forms of selfunloading principles. In the electrical beam machining, electrical energy is used to generate the electrons with high energy. Electrical discharge machining edm is one of the most widely used nontraditional machining processes. Electrical discharge machine edm is an important nontraditional manufacturing method, developed in the late. Single phase ideal transformer and basic equations. Tool high power sine wave generator this unit converts low frequency 60 hz electrical power to high frequency 20khz electrical power. Electrical discharge machining edm is a nontraditional machining process based on removing material from a part by means of a series of repeated electrical discharges between tools, called electrodes, and the part being machined in the presence of a dielectric fluid. Jain, allied publishers, new delhi 41 electron beam machining ebm prof. Oct 23, 2008 lecture series on manufacturing processes ii by prof. Michael faraday discovered that if the two electrodes are placed in a bath. As you know that there are various nontraditional machining methods and edm is one of them and the rest are presented below. Electrical discharge machining an overview sciencedirect. In these problems, the numeric values for different physical quantities are set so as to make the calculations easy.
Plasma arc machining or laser beam machining is that which is the last point. Introduction electrochemical machining ecm is one of the newest and most useful nontraditional machining ntm process belonging to electrochemical category. Nptel mechanical mechatronics and manufacturing automation joint initiative of iits and iisc funded by mhrd page 4 of 63 centrifugal pump uses rotational kinetic energy to deliver the fluid. Paul,department of mechanical engineering, iit kharagpur. Recent development s and trends anbesh jamwal 1, ankur aggarwal 2, nishant gautam 3, akhil devarapalli 4 1,2,3 pg student, dept. Electric discharge machining free download as powerpoint presentation. Electrical discharge machining edm is a method for producing holes and slots, or other shapes. Which one he following statements is true for electrical discharge machining. The shape and also the hardness of the materials being used make edm ideal. Abrasive jet machining but not water jet machining c. Lecture notes on modern manufacturing process dr pramod. Part 2 deals with thermal machining processes for example, electric discharge machining, laser beam machining, electron beam machining, etc.
In the diesinking edm process, the workpiece is machined by a controlled electrical spark generated in the gap between the electrode tool and. Answers to the assignments with full explanation nptel. How an electrical discharge machining works engineer. Nontraditional machining mechanical engineering, iitb. Electrochemical machining ecm is used to remove metal and alloys which are difficult or impossible to machine by mechanical.
Electrical discharge machining edm mercer university. Manufacturing process technology ii dvd media storage type. In the electron beam machining process, a high velocity focused beam of electrons are used to remove the metal from the workpiece. The introduction of abrasives to the fluid jet enhances the. This process has brought dramatic improvements to industry in accuracy, quality, productivity, and earnings. Electrical discharge machining is a process in which electrical energy is used to. Electric discharge machining process is carried out in presence of dielectric fluid. Sharma, department of mechanical engineering, iit roorkee. Electrodischarge machining process can be controlled by parameters like pulse on time, voltage and current. This process works on the principle of of faradays laws of electrolysis. Ultrasonic machining is a nontraditional process, in which abrasives contained in a slurry are driven against the work by a tool oscillating at low amplitude 25100 microns and high frequency 1530 khz.
It also includes micronanofinishing processes viz, abrasive flow finishing, magnetic abrasive finishing, etc. Ultrasonic machining, water jet machining, abrasive water jet machining. Edm, is especially wellsuited for cutting intricate contours or delicate cavities that would be difficult to produce with a grinder, an end mill or other cutting tools. Machine tool selection, application, electrical discharge grinding, wire edm. Electrical discharge machine edm is now become the most important accepted technologies in manufacturing industries since many complex 3d shapes can be machined using a simple shaped tool electrode. Electric discharge machiningbasic terms and working. Module 3 selection of manufacturing processes nptel.
Edm uses an electric spark to remove a small amount of material from the workpiece, thus, resulting in the machining of the workpiece. An electrical spark is created between an electrode and a workpiece. Ultrasonic machining and electrical discharge machining d. Revolutionizing machining wire electrical discharge machining edm is one of the greatest innovations affecting the tooling and machining industry. This removes erodes very tiny pieces of metal from the workpiece at a controlled rate.
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