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. Diesinker edm and wire cut electric discharge machining wedm 21. Tec h, mec anic al engineering cd m, bharati vidyapeeth deemed university college of engineering,pune. This is known as gaseous chemical machining or hot chlorine. 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. 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. Edm is thermal erosion process whereby material is melted and vaporized from an. 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. Basic mechanical engineering covers a wide range of topics and engineering concepts that are required to be learnt as in any undergraduate engineering course. Electric discharge machining edm, sometimes colloquially also referred to as spark machining, spark.
Nptel video lecture topics for mechanical engineering new no. References a b theoretical models of the electrical discharge machining process. 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. During this machining process, a small portion of metals is also eroded away, leaving a small cater. Electrical discharge machining edm is one of the most widely used nontraditional machining processes. Sharma, department of mechanical engineering, iit roorkee. Electrical discharge machining edm has long been the answer for high accuracy, demanding machining applications where conventional metal removal is difficult or impossible. Mar 31, 2017 it is a nontraditional machining process in which no physical tool is used. In this process, particles travel from the anodic material workpiece toward the cathodic material machining tool. A thermoelectric model of material removal during electric discharge machining. Edm is basically a thermal process in which the material is removed by the action of electric sparks between. Electro discharge machining still has some disadvantages and those are.
On electro discharge machining of inconel 718 with hollow. Electrochemical machining ecm electro chemical grinding ecg electro jet drilling ejd 3. Electric discharge machining edm process video lecture by. In electro chemical machining an electrolyte acts as a current carrier. May 12, 2017 electrochemical machining ecm is a machining process in which electrochemical process is used to remove materials from the workpiece. It has been found that switching phenomenon plays a crucial role in spark generation and not the straightforward breakdown of the nonconducting vapour blanket. Electrochemical machining ecm is a metalremoval process based on the principle of reverse electroplating. Electrical discharge machining edm and electrochemical. Electrothermal processes electrodischarge machining edm laser jet machining ljm electron beam machining ebm 4.
Manufacturing knowledge menu edm manufacturing services edm manufacturing equipment. This alloy has been widely used in jet engines and highspeed airframe parts in aeronautic application. 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. Shantanu bhattacharya coordinating institute iit kanpur subtitles available unavailable lab session lab session lab session lab. Chemical machining for some special purposes can also be achieved by using a jet of reactive gas, e. Other machining processes theres more than one way to skin a cat, as the old expression goes. Electrical discharge machining edm has long been the answer for high accuracy, demanding machining applications. Electro discharge machine construction and working this is also called spark erosion, electroerosion machining. Similarly, theres typically more than one way to cut parts.
Known by many other names, including spark machining, arc machining and inaccurately. The two electrodes workpiece and tool is immersed in an electrolyte such as nacl. In order to meet these challenges, a number of newer material. 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. 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.
Jan 03, 2020 definition of electro discharge machining. Sep 24, 2018 the electrolytic fluid is pumped through the gap between the workpiece and the grinding wheel. Electro discharge machining edm laser jet machining ljm electron beam machining ebm 4. Since the acquisition of our first wickman, edm precispark has strived to stay at the forefront of the process technology through innovation and investment. Electro discharge machining edm process is a nonconventional and noncontact machining operation which is used in industry for high precision products. Chemical machining working principle, application, advantages. This paper highlights the important results of the investigations on electrochemical discharge machining ecdm conducted by the author and his coresearchers. Edm machining process is also known as spark erosion machining.
Oct 23, 2008 lecture series on manufacturing processes ii by prof. Edm works by eroding material in the path of electrical discharges that form an arc between an electrode tool and the work piece. Electrodischarge machining edm is a process for shaping hard metals and forming complexshaped holes by arc erosion in all kinds of electroconductive materials. Instructional objectives i manufacturing process ii.
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. Mar 11, 2016 applications of electric discharge machining process. It is also known as spark erosion, electro erosion or spark machining. Electro discharge machining edm is an electrothermal nontraditional machining process, where electrical energy is used to generate electrical spark and. Electrical discharge machining, edm is one of the most accurate manufacturing processes available for creating. Pdf electrical discharge machining of tungsten carbides. Electrochemical and electrodischarge machining processes are the two major electromachining processes with unique capabilities. Precisparks foundations were based on electrodischarge machining.
Electrochemical machining ecm is a nontraditional machining process uses the principle of faraday to remove metal from the workpiece. 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. Since the acquisition of our first wickman, edm precispark has strived to stay at the forefront of the. 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. May 17, 2011 inconel 718 is a nickelbased alloy designed for high yield, tensile, and creeprupture properties. Feb 26, 2015 references a b theoretical models of the electrical discharge machining process. Lecture series on manufacturing processes ii by prof. Electrical discharge machining is a machining method primarily used for hard metals or those that would be very difficult to machine with traditional techniques. 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.
It is an electrothermal machining process where electrical energy is used to. In the process, workpiece is taken as anode and tool is taken as cathode. How is classification of nontraditional machining done. Electrical discharge machining edm design consideration. What is electrical discharge machining edm process. May 14, 2016 34 p a g e references 1 pdf lesson39 electro discharge machiningmodule9 non conventional machining version2 me iit kharagpur. What is hybrid manufacturing and classification of hybrid. Edm typically works with materials that are electrically conductive, although methods have also been proposed for using edm to machine insulating ceramics 8 9. Lecture electric discharge grinding, electric discharge diamond grinding and. This machine is used to get the desired shapes of materials by using the electrical. Advanced machining processes video course mechanical. S jadoun, current advanced research development of electric discharge machining edm. This will generate high heat energy and melts and vaporize metal from work piece. 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.
During this machining process, a small portion of metals is also eroded away. This is known as gaseous chemical machining or hot chlorine machining and can be used for deburring of metal parts. Technology suitable for both serial and small quantity production. Journal of manufacturing and industrial engineering, 12. Chemical milling sometimes called chem milling or contour machining or etching. Ultrasonic vibration pulse electrodischarge machining of. It is a nontraditional machining process in which no physical tool is used. The electrode is a thin wire, with diameters that typically range from. Electron beam machining is same as laser beam machining process in which except laser, high speed electron beam impinges on work piece.
Lecture 19 electric discharge machining edm process. The variable mass, cylindrical plasma model singh, a. 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. Technological improvement of machining processes can be achieved by combining different machining actions or phases to be used on the material being removed. Electrical discharge machining is the process of metal removal from the work surface due to an erosion of metal caused by electric spark discharge between the two electrodes tool cathode and the work anode. Chemical processes chemical milling chm photochemical milling pcm. Brief overview 1 ultra sonic machining usm is a mechanical. The types of electrical discharge machines introduced were the diesink in 1943 and the wirecut machine in 1960s. Review of electrochemical and electrodischarge machining. 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.
Lecture 28 electric discharge machining process digimat. 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. A current of electrolyte fluid carries away the deplated material before it has a chance to reach the machining tool. Inconel 718 is a nickelbased alloy designed for high yield, tensile, and creeprupture properties. Wire cut edm, also known as wire electrical discharge machining, or wire edm is a method of cutting or shaping conductive materials with a thin electrode that follows a precisely programmed path. Electric discharge machining edm ppt topics for seminar. 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. Electron beam machining is same as laser beam machining process in which except laser, high speed electron beam. Electron beam machining mechanical engineering blog. Chemical processes chemical milling chm photochemical milling pcm 1. Lecture 19 electric discharge machining edm process digimat.
Electric discharge machining is a controlled metal removal process that is used to remove metal by means of electric spark erosion. This alloy has been widely used in jet engines and highspeed airframe parts in aeronautic. Electric discharge machining edm process video lecture. 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. Mechanical engineering manufacturing processes ii nptel. Electrochemical machining ecm is a machining process in which electrochemical process is used to remove materials from the workpiece. Compared with conventional machiningfrom basic cnc turning all the way up to 5axisedm has certain advantages and disadvantages.
It is also known as spark erosion, electroerosion or spark machining. It is also known as contactless electrochemical forming process. Equbal a, sood a m 2014 electrical discharge machining. 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. 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. 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. This is a manufacturing operation in which we used to make desired shapes by using an electrical spark. Journal of materials processing technology elsevier journal of materials processing technology 53 1995 811816 ultrasonic vibration pulse electrodischarge machining of holes in engineering. To learn about various unconventional machining processes, the.
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. Paul,department of mechanical engineering, iit kharagpur. Electrical discharge machining edm is one of the most extensively used nonconventional material removal processes. In this study, electric discharge machining edm process was used for machining commercially available inconel 718. In electric discharge machining process an arc is produced when two currentcarrying wires are shortcircuited. 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. Part 1 deals with mechanical type advanced machining processes such as. Introduction electrochemical machining ecm is one of the newest and most useful nontraditional machining ntm process belonging to electrochemical category. Electrochemical machining is often used as an alternative to the cavity type electric discharge machining edm.
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