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. Ultrasonic machining is used primarily for cutting hard, brittle materials that may be conductors of electricity or insulators. Answer: Option D. The process may be used for cutting most metals, including those that cannot be cut efficiently with an oxyacetylene torch. It is also known as spark erosion , electro-erosion or spark machining. 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. 1) High speed steel The beam removes atoms from the workpiece by transferring energy and momentum to atoms on the surface of the object. Electical discharge machining is a techinque in which electricity is used to machine (cut, grind, etc.) C. Copper tungsten alloy. In IBM a stream of charged atoms (ions) of an inert gas, such as argon, is accelerated in a vacuum by high energies and directed toward a solid workpiece. 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 to an electric voltage. 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) is a nontraditional method which is used most commonly to machining of difficult-to-machine materials. As one electrode moves toward the other to maintain a constant gap, the anode workpiece is machined into a complementary shape. Several experiments are conducted to study the effect of three process parameters: peak current (I p ), pulse on-time (T on ) and electrode material on the machining process of H13 die steel. The mechanism of material removal in EDM process is, 3. Answer. Moreover, the special requirements of automotive mass production have had a profound influence on the design and development of highly specialized machine tools and have stimulated technological advances in petroleum refining, steelmaking, paint and plate-glass manufacturing, and other industrial processes.…. T… With heavy-duty torches, aluminum alloys up to six inches (15 centimetres) thick and stainless steel up to four inches (10 centimetres) thick have been cut by the PAM process. 9.Tool: The tool used in the Electric Discharge Machining process is either Copper or Tungsten or Copper-Tungsten Alloy. The technique is also used for texturing surfaces to enhance bonding, for producing atomically clean surfaces on devices such as laser mirrors, and for modifying the thickness of thin films and membranes. The process is used for the profile cutting of flat plate, for cutting grooves in stainless steel, and, on lathes, for turning large, hardened steel rolls. In USM, material is removed from a workpiece with particles of abrasive that vibrate at high frequency in a water slurry circulating through a narrow gap between a vibrating tool and the workpiece. In practical terms, electrical discharge machining overcomes a major issue found in contact machining: hardness. 1. Electrical Discharge Machining (EDM) is a machining technique through which the surface of a metal workpiece is formed by discharges occurring in the gap between the tool, which serves as an electrode, and the workpiece. The electrode and workpiece are immersed in a dielectric liquid, and a feed mechanism maintains a spark gap of from 0.0005 to 0.020 inch (0.013 to … In electro discharge machining, cutting tools are usually made of; 1) High speed steel; 2) Tool steel; 3) Carbide-tipped tool; 4) Graphite - 7234270 The process is accurate, but slow, and is used for machining dies, molds, holes, slots, and cavities of almost any desired shape. A spark is geerated between the tool and workpiece in the presence of dielectric medium and thereby material removal takes place from the surface of workpiece. Ring in the new year with a Britannica Membership. Electrical discharge machining (EDM) is used to machine hard materials and to produce complicated shapes. (a) Copper. Typically the electrode diameters range from.004″ –.012″ (.10mm –.30mm), … Though some basic devices such as the woodworking lathe had existed for centuries, their evolution into…, A numerical-control machine tool is a good example of programmable automation. (c) Cast Iron. Temperatures obtainable in the plasma zone range from 20,000° to 50,000° F (11,000° to 28,000° C). Holes as small as 80 micrometres have been drilled by this type of USM. As spark discharges melt or vaporize small particles of the workpiece, the particles are flushed away, and the electrode advances. Lasers also are used to drill and cut ceramics and substrates for integrated circuits; the aircraft industry uses CNC-controlled lasers to cut profiles and to drill holes in engine parts. In electro discharge machining, tool is made of. Other common applications of USM include cutting semiconductor materials (such as germanium), engraving, drilling fine holes in glass, and machining ceramics and precious stones. Electro-discharge machining (basic principle) Electro-Discharge Machining (EDM) is machining with sparks. The gap is flushed by the third interface element, the dielectric fluid. Materials such as tool steel, ceramic, metal matrix composite, and Inconel widely are used in die molding, aerospace, surgical and automotive industries. One of the electrodes is called the tool-electrode, or simply the tool or electrode, while the Applications of ECM can be found in the aircraft engine and automobile industries, where the process is used for deburring, drilling small holes, and machining extremely hard turbine blades. Assertion (A): In ECM, the shape of the cavity is the .mirror image of the tool, but unlike EDM, the tool wear in ECM is less. The tool and workpiece is immersed in a dielectric medium (kerosene or deionized water). 2. In the water-jet machining process, water is forced through tiny nozzles under very high pressures to cut through materials such as polymers, brick, and paper. 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