Edm is basically a thermal process in which the material is removed by the action of electric sparks between. It is an electro thermal machining process where electrical energy is used to generate electrical spark and material removal mainly occurs due to thermal energy of the spark. Compared with conventional machiningfrom basic cnc turning all the way up to 5axisedm has certain advantages and disadvantages. Here, the reaction between the electrolytic fluid and the workpiece removes most of the metal while the abrasive material from the grinding wheel removes less than 5% of the unnecessary material from the workpiece. In this process, particles travel from the anodic material workpiece toward the. Here, the reaction between the electrolytic fluid and the workpiece removes most of the metal. Electrical discharge machining is a machining method primarily used for hard metals or those that would be very difficult to machine with traditional techniques. In this process, particles travel from the anodic material workpiece toward the cathodic material machining tool. Shantanu bhattacharya coordinating institute iit kanpur subtitles available unavailable lab session lab session lab session lab. This will generate high heat energy and melts and vaporize metal from work piece. Electric discharge machining edm process video lecture by. A current of electrolyte fluid carries away the deplated material before it has a chance to reach the machining tool. Sharma, department of mechanical engineering, iit roorkee.
Electric discharge machining edm process video lecture. Electrical discharge machining edm is one of the most extensively used nonconventional material removal processes. The book also describes the development of electrical discharge machining edm, the edm system and process, the edm sparking system, the power supply generator, spark voltage, electrode servo. In the process, workpiece is taken as anode and tool is taken as cathode. A mechanical conventional single cutting or ma action process can be combined with the respective machining phases of electrodischarge ed in electrodischarge machining edm or ecd in ecm. In this study, electric discharge machining edm process was used for machining commercially available inconel 718. Pdf electrical discharge machining of tungsten carbides. Feb 26, 2015 references a b theoretical models of the electrical discharge machining process. Electrochemical machining is often used as an alternative to the cavity type electric discharge machining edm. Part 1 deals with mechanical type advanced machining processes such as.
Known by many other names, including spark machining, arc machining and inaccurately. It is also known as spark erosion, electroerosion or spark machining. 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. Edm works by eroding material in the path of electrical discharges that form an arc between an electrode tool and the work piece. This is a manufacturing operation in which we used to make desired shapes by using an electrical spark. Divided into three parts, this book lays emphasis on explaining the logic and physics of critical problems to develop analytical skills in students. Paul,department of mechanical engineering, iit kharagpur. Basic mechanical engineering covers a wide range of topics and engineering concepts that are required to be learnt as in any undergraduate engineering course. This is known as gaseous chemical machining or hot chlorine. Brief overview 1 ultra sonic machining usm is a mechanical. Electrical discharge machining edm electrical discharge machining edm is ideal for intricate burrfree cutting of intricate contours or cavities in hard materials, eliminating the need to soften the material. May 12, 2017 electrochemical machining ecm is a machining process in which electrochemical process is used to remove materials from the workpiece. Mar 31, 2017 it is a nontraditional machining process in which no physical tool is used.
Jan 03, 2020 definition of electro discharge machining. In electric discharge machining process an arc is produced when two currentcarrying wires are shortcircuited. Lecture series on manufacturing processes ii by prof. Electrical discharge machine the traditional machining processes rely on harder tool or abrasive material to remove the softer material whereas nontraditional machining processes such as edm uses electrical spark or thermal energy to erode unwanted material in order to create desired shape. This machine is used to get the desired shapes of materials by using the electrical. Electrochemical and electrodischarge machining processes are the two major electromachining processes with unique capabilities. Chemical machining working principle, application, advantages. It is also known as contactless electrochemical forming process. Introduction electrochemical machining ecm is one of the newest and most useful nontraditional machining ntm process belonging to electrochemical category. What is hybrid manufacturing and classification of hybrid.
What is electrical discharge machining edm process. S jadoun, current advanced research development of electric discharge machining edm. This paper highlights the important results of the investigations on electrochemical discharge machining ecdm conducted by the author and his coresearchers. This alloy has been widely used in jet engines and highspeed airframe parts in aeronautic application. Electrochemical machining ecm is a machining process in which electrochemical process is used to remove materials from the workpiece. It is a nontraditional machining process in which no physical tool is used. The variable mass, cylindrical plasma model singh, a.
Manufacturing knowledge menu edm manufacturing services edm manufacturing equipment. Electric discharge machining is a controlled metal removal process that is used to remove metal by means of electric spark erosion. Electrical discharge machining edm has long been the answer for high accuracy, demanding machining applications. Electrochemical machining ecm electro chemical grinding ecg electro jet drilling ejd 3. Electrochemical machining does not produce surface stress in the work piece therefore even very brittle and easily deformed materials may be machined in thin walled shapes. The book also describes the development of electrical discharge machining edm, the edm system and process, the edm sparking system, the power supply generator, spark voltage, electrode servo systems, dielectric systems, ionization and electrode wear, chips, the edm surface, dc arcing, different kinds of edm, automatic servo systems. Other machining processes theres more than one way to skin a cat, as the old expression goes. This alloy has been widely used in jet engines and highspeed airframe parts in aeronautic. Nptel video lecture topic list created by linuxpert systems, chennai nptel video course mechanical engineering advanced manufacturing process for micro sytem fabrication subject coordinator dr. Electrochemical machining ecm is a metalremoval process based on the principle of reverse electroplating. How is classification of nontraditional machining done. Chemical machining for some special purposes can also be achieved by using a jet of reactive gas, e.
Advanced machining processes video course course outline there is a need for machine tools and processes which can accurately and easily machine the most difficulttomachine materials and workpieces with intricate and accurate shapes. Lecture 19 electric discharge machining edm process digimat. Electrical discharge machining edm has long been the answer for high accuracy, demanding machining applications where conventional metal removal is difficult or impossible. Diesinker edm and wire cut electric discharge machining wedm 21. Advanced machining processes video course course outline there is a need for machine tools and processes which can accurately and easily machine the most difficultto. 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. This is known as gaseous chemical machining or hot chlorine machining and can be used for deburring of metal parts. Precisparks foundations were based on electrodischarge machining. Chemical processes chemical milling chm photochemical milling pcm 1. Inconel 718 is a nickelbased alloy designed for high yield, tensile, and creeprupture properties. So, due to this, edm is particularly useful in machining of small holes, orifices, slots in diesel fuel injection nozzles, airbrake valves and aircraft engines etc.
Chemical milling sometimes called chem milling or contour machining or etching. Electrochemical machining ecm is used to remove metal and alloys which are difficult or impossible to machine by mechanical. Edm is thermal erosion process whereby material is melted and vaporized from an. References a b theoretical models of the electrical discharge machining process. Electron beam machining is same as laser beam machining process in which except laser, high speed electron beam. Technological improvement of machining processes can be achieved by combining different machining actions or phases to be used on the material being removed. Electro discharge machine construction and working this is also called spark erosion, electroerosion machining. It has been found that switching phenomenon plays a crucial role in spark generation and not the straightforward breakdown of the nonconducting vapour blanket. Review of electrochemical and electrodischarge machining. Journal of manufacturing and industrial engineering, 12. Electro discharge machining edm process is a nonconventional and noncontact machining operation which is used in industry for high precision products. Electrical discharge machining, edm is one of the most accurate manufacturing processes available for creating. Equbal a, sood a m 2014 electrical discharge machining. The electrical discharge machine is a machine that follows some technique in order to shape the surfaces of metal objects with the help of a dielectric liquid and a tool that releases a high intensity electric discharge.
Electrochemical machining ecm is a nontraditional machining process uses the principle of faraday to remove metal from the workpiece. Electrical discharge machine the traditional machining processes rely on harder tool or abrasive material to remove the softer material whereas nontraditional machining processes such as edm. Electrical discharge machining edm design consideration. Technology suitable for both serial and small quantity production. The types of electrical discharge machines introduced were the diesink in 1943 and the wirecut machine in 1960s. The process of metal removal by electro chemical dissolution was known as long back as 1780 ad but it is only over the last couple of decades that this method has been used to advantage. Electrical discharge machining edm and electrochemical. Edm machining process is also known as spark erosion machining. Electron beam machining is same as laser beam machining process in which except laser, high speed electron beam impinges on work piece.
Electro discharge machining edm is a process for shaping hard metals and forming complexshaped holes by arc erosion in all kinds of electro conductive materials. Ultrasonic vibration pulse electrodischarge machining of. During this machining process, a small portion of metals is also eroded away. To learn about various unconventional machining processes, the. Instructional objectives i manufacturing process ii. Electro discharge machining edm is an electrothermal nontraditional machining process, where electrical energy is used to generate electrical spark and.
Sep 24, 2018 the electrolytic fluid is pumped through the gap between the workpiece and the grinding wheel. A thermoelectric model of material removal during electric discharge machining. Advanced machining processes video course mechanical. Electron beam machining mechanical engineering blog. Since the acquisition of our first wickman, edm precispark has strived to stay at the forefront of the process technology through innovation and investment. Electrical discharge machining edm electrical discharge machining edm is ideal for intricate burrfree cutting of intricate contours or cavities in hard materials, eliminating the need to soften the material before machining, and then reharden it through heattreating. Electric discharge machining edm, sometimes colloquially also referred to as spark machining, spark. The two electrodes workpiece and tool is immersed in an electrolyte such as nacl. Similarly, theres typically more than one way to cut parts. Lecture electric discharge grinding, electric discharge diamond grinding and. Electro discharge machining still has some disadvantages and those are. May 14, 2016 34 p a g e references 1 pdf lesson39 electro discharge machiningmodule9 non conventional machining version2 me iit kharagpur.
In order to meet these challenges, a number of newer material. Edm typically works with materials that are electrically conductive, although methods have also been proposed for using edm to machine insulating ceramics 8 9. Mechanical engineering manufacturing processes ii nptel. Electric discharge machining edm ppt topics for seminar. In electro chemical machining an electrolyte acts as a current carrier. During this machining process, a small portion of metals is also eroded away, leaving a small cater. It is also known as spark erosion, electro erosion or spark machining. The electrolyte in ecm should have high electrical conductivity, low viscosity, high specific heat, chemical stability, resistance to form a passivating film on the workpiece surface, noncorrosives and nontoxicity. Edm is basically a thermal process in which the material is removed by the action of electric sparks between two electrodes made of conductive materials.
Electrical discharge machining edm is one of the most widely used nontraditional machining processes. Electrodischarge machining edm is a process for shaping hard metals and forming complexshaped holes by arc erosion in all kinds of electroconductive materials. Lecture 19 electric discharge machining edm process. The electrode is a thin wire, with diameters that typically range from. The electrolytic fluid is pumped through the gap between the workpiece and the grinding wheel. Journal of materials processing technology elsevier journal of materials processing technology 53 1995 811816 ultrasonic vibration pulse electrodischarge machining of holes in engineering. Tec h, mec anic al engineering cd m, bharati vidyapeeth deemed university college of engineering,pune. Advanced machining processes video course course outline there is a need for machine tools and processes which can accurately and easily machine the most difficultto machine materials and workpieces with intricate and accurate shapes. Electro discharge machining edm laser jet machining ljm electron beam machining ebm 4. Electrothermal processes electrodischarge machining edm laser jet machining ljm electron beam machining ebm 4. Lecture 28 electric discharge machining process digimat. Since the acquisition of our first wickman, edm precispark has strived to stay at the forefront of the. May 17, 2011 inconel 718 is a nickelbased alloy designed for high yield, tensile, and creeprupture properties. Electrical discharge machining edm and electrochemical machining ecm offer a better alternative or sometimes the only alternative in generating accurate 3d complex shaped macro, micro and nano features and components of difficulttomachine materials.
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