This is a manufacturing operation in which we used to make desired shapes by using an electrical spark. Edm involves the direction of highfrequency 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. Electrical discharge machining is a machining method primarily used for hard metals or those that would be very difficult to machine with traditional techniques. Material hardness does not effect process tungsten carbide stellite hastelloy nitralloy waspaloy nimonic inconel all can be successfully machined by edm. Electro discharge ltd is part of the mj sections aerospace group offering an electro discharge machining, spark eroding and wire cutting service to a diverse group of industries including aerospace, motor sport, nuclear and oil. In traditional processes, metal workpieces are made from special grades of hardenable tool steels machined in an anneal of soft state to facilitate cutting. P a g e 40 wedm was first introduced to be manufacturing industry in the late 1960s.
Electrical discharge machining process machining drilling. Today robots are available that can feed various machines, such as a milling machine, wire edm, and a ram edm. There is some limited use of edm to produce rifling in gun barrels. Anywhere from 1,000 to 100,000 sparks are generated on and off between the electrode and the metal per second. Welcome to this session on electro discharge machining under the course advance manufacturing processes. Generally speaking, however, the principle characteristics of electrical discharge machining should give you a sense of whether edm is a good fit for your application. Performance study of wire cut electric discharge machining process by using. On this channel you can get education and knowledge for general issues and topics. The development of the process was the result of seeking a technique to replace the machined electrode used in edm. If you are not able to download lectures due to bandwidth constraints, you can obtain the courses in dvds by paying a nominal fee to cover the cost of storage media and distribution.
Lecture series on manufacturing processes ii by prof. Electrical discharge machining edm is a comparatively new machining method which has several decades. Electrical discharge machining edm is one of the earliest nontraditional machining processes. Optimization of machining variables in electric discharge.
Electro discharge machining free download as powerpoint presentation. Pdf numerical modelling of electrodischarge machining. Edm machining process is also known as spark erosion machining. When the best electrode can be determine, it would lead to better process. In this study, electric discharge machining edm process was used for machining commercially available inconel 718. Understanding electrical discharge machining 29 automation and edm here is an example in which one may use their imagination to become more competitiveusing automatic production cells. Electro discharge machining industrial processes industries.
Electro discharge machining how is electro discharge. Nptel syllabus advanced manufacturing processes video course course outline the course covers the details of the advanced machining. Nptel syllabus advanced machining processes video course course outline this course on advanced machining processes is also known as unconventional machining processes, modern machining processes, and new technology. Paul,department of mechanical engineering, iit kharagpur. Laserecm, electrochemical discharge machiningecdm, combined electrochemical. Wire electric discharge machining wire edm youtube. Characterization of metals machined using edm major project. Developments in electrochemical discharge machining. May 17, 2011 inconel 718 is a nickelbased alloy designed for high yield, tensile, and creeprupture properties. It deals with the latest machining processes named as advanced machining processes.
Electrochemical discharge machining using abrasive powder. This alloy has been widely used in jet engines and highspeed airframe parts in aeronautic application. Why you should consider electro discharge machining advantages. Chemical machining and ecm are thermalfree processes, but chemical machining cannot be applied to machine. The kinematics of wedm is comparable to that of a band saw. Technology suitable for both serial and small quantity production. Electrical discharge machining home modern firearms manufacture fine forming operations electrical discharge machining.
Principles of electrical discharge machining and non. Tec h, mec anic al engineering cd m, bharati vidyapeeth deemed university college of engineering,pune. Electrical discharge machining process free download as powerpoint presentation. Jan 09, 2018 in practical terms, electrical discharge machining overcomes a major issue found in contact machining. Edm typically works with materials that are electrically conductive, although methods have also been proposed for using edm to machine insulating ceramics. These sparks strike the surface of the metal, carving out the shape of the electrode. Investigation into application of electrical discharge. The international academy for production engineering, laperriere l. Electro discharge machining edm is an electrothermal nontraditional machining process, where electrical energy is used to generate electrical spark and. Nptel material is available for free on nptel website. A spark occurs in a small gap between the work piece and the. On electro discharge machining of inconel 718 with hollow. Learn about wire edm, sinker edm, the history of edm techniques, and more. Investigation into application of electrical discharge machining as a surface treatment process.
Figure 3 shows a sample structure fabricated by a prototype 5axis system with two rotational mechanisms takahata et al. So these are the 4 different components of the edm electrodischarge machining process. For example, edm is typically slower than other machining methods, but it also tends to be more predictable, accurate and repeatable. Electrical discharge machining edm, electrode, spark, workpiece, gap, conductivity. Chapter 2 overview of hybrid machining processes iit kanpur. Electrical discharge machining, or edm, shapes metal by creating sparks that melt tiny portions of the workpiece, and is an exceptionally diverse process that generates no cutting forces. Mar 11, 2016 in electric discharge machining process an arc is produced when two currentcarrying wires are shortcircuited. Welcome to the course on advanced machining processes, now organization of the. 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. Chapter 5 electrochemical based hybrid machining iit kanpur. Microelectrodischarge machining technologies for mems. These irregularities combine to form surface texture.
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. Electrical discharge machining is a manufacturing process whereby a desired shape is obtained by using electrical discharges sparks. Electrical discharge machining wire edm edm machining. Edm process is based on thermoelectric energy between the work piece and an electrode. Nptel electrical engineering video lecture online study material. Edm machining electrical discharge machining makes it possible to work with metals for which traditional machining techniques do not work. Electro discharge machining edm electron beam machining ebm laser beam machining lbm processes 2. Electrical discharge machining edm uses an electrical arc between a shaped electrode and the work surface to burn away material to a predetermined.
Electrodischarge diamond grinding also named as electrocontact abrasion. This process is also called as electro discharge machiningelectro erosion processelectro spark machining. Edm process, electrodischarge grinding process, and electrodischarge diamond. Wire electrical discharge machining wedm, a process variant introduced industrially in 1969 1, is characterized by a path programmed cut of the workpiece contour by a traveling wire electrode. History of edm in1770s, discovered by joseph priestly. Mar 08, 2014 a presentation about wire electrical discharge machining wedm slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Micro electro discharge machining technologies for mems 145 the process. If you continue browsing the site, you agree to the use of cookies on this website. 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 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 home modern firearms manufacture rifled barrels electrical discharge machining. In electric discharge machining process an arc is produced when two currentcarrying wires are shortcircuited. Simplicity and small sized setup make ecdm a very attractive technology.
Performance study of wire cut electric discharge machining. Thus electrochemical discharge machining ecdm was developed by kura fuji in 1968 s. Numerical modelling of electrodischarge machining process using moving mesh feature. Electrical discharge machining used on hard metals works with electrically conductive materials 3. Electricaldischarge machining technology britannica. The definition is that electrical discharge machining wire cutting edmwc is a.
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