MAGNETIC LENSES - Which shapes the electron beam and doesn't allow to deflect electrons, this lenses allow only to pass convergent electron, thus a highly focused beam is obtained, they also accept the low energy electrons thereby improving the quality of the same 3.WORKPIECE AND HOLDING DEVICE - It can machine both metallic and nonmetallic device, the workpiece is held by a … d) none of these. These high energy electrons possess high energy density generally in the order of 10ˆ4 kW/mm²… Click here to navigate to respective pages. EBW is often performed under vacuum conditions to prevent dissipation of the electron beam. Ionic dissolution rate is faster at the closest point between tool and workpiece. It is mostly used to drill holes in any shape. Electron Beam Machining (EBM) Electro-Chemical Machining (ECM) ... Material removal takes place from all such points on the workpiece where the electron beam is focused. Household appliances: refrigerators, washing machines, air conditioners, etc. Electron Beam Machining can machine metallic as well as nonmetallic workpiece. An electron "cloud" is generated by a superheated tungsten filament, which also acts as the cathode. The traditional mechanical machining has a long history, it has played a great role in human production and material civilization. c) electrolyte. ConversionConversion In this mechanical engineering coures we study of machine design or objective. 160,000 km/sec.) Electron beam machining does not apply any cutting force on the workpiece, thus very simple work holding is required. Today we study of  mcq on rolling  contact bearing (objecti... Mcq on electron beam machining (objectives questions and answers). Answer : (A) electron beam machining Subject : Machining and Machine Tool Operations ... Orthogonal turning is performed on a cylindrical workpiece with shear strength of 250 MPa. The beam current is usually between 0.1-1.0 mA. In an electron beam machining the electrons strike the. c. Direct contact machining d. Capable of producing sharp corners (Ans:a) 18. As the electron strikes the workpiece, the kinetic energy of the electron changes into heat energy. 30990675 Howick Place | London | SW1P 1WG © 2020 Informa UK Limited. In the Electron Beam Machining process, a high velocity focused beam of electrons are used to remove the metal from the workpiece. Electron beam machining (EBM) Chemical and electrochemical energies are utilized in case of Chemical Machining (CM) and Electrochemical Machining (ECM) respectively. The kinetic energy of the electrons, upon striking the workpiece, changes to heat, which vaporizes… Chemical Machining (CM) is the process where, desired amount of material is removed from the remaining portion of work surface by the application of reactive chemicals. This whole process takes place in vacuum chamber. Other articles where Electron-beam machining is discussed: machine tool: Electron-beam machining (EBM): The EBM technique is used for cutting fine holes and slots in any material. Electrons escapes from the hot surface and a voltage of 50 to 200 kV helps to accelerate them. The Electron beam machining (EBM) process begins after the workpiece is placed in the work chamber and a vacuum is achieved. 22.16 Which one of the following processes would be appropriate to drill a hole with a square cross section, 6 mm (0.25 in) on a side and 25 mm (1 in) deep in a steel workpiece: (a) abrasive jet machining, (b) chemical milling, (c) EDM, (d) laser beam machining, (e) oxyfuel cutting, (f) … In Electron beam machining, as the electrons strikes the work piece a. This sputter etching mechanism is very simple. Electron beam machining (EBM) uses a focused beam of high-velocity electrons to remove material. In a vacuum chamber, a beam of high-velocity electrons is focused on a workpiece. Correct answer:a. Q 29. In Electron beam machining, workpiece is held in a. vacuum chamber b. dielectric medium c. electrolyte d. none of these (Ans:a) 7. A typical triode EBM gun functions in a manner very similar to an EBW gun. Their kinetic energy is converted into heat b. c) electrolyte. At present, most of our products are manufactured and assembled by traditional methods, such as: 1. Power requirements are on the order of 0.5-60 kW. The following conditions are used: cutting velocity is 180 m/min, feed is 0.20 mm/rev, … a) vacuum chamber. The process is different from electric discharge, electron beam, laser and plasma arc machining in that the process does not depend on heating of the workpiece to the point of evaporation. Thus surface asperities and waviness influence the dissolution rate is faster at closest! Thus surface asperities and waviness influence the dissolution rate significantly on work piece nonmetallic workpiece Place! 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