Due to high power density instant melting and vaporisation starts and “melt – vaporisation” front gradually progresses Finally the molten material, if any at the top of the … Name two methods of focusing the electron beam. This concentrated heat raises the temperature of work material and vaporizes a small amount of it, resulting in the removal of metal from the workpiece. The kinetic energy of the electrons, upon striking the workpiece, changes to … Thank you For Visiting. The source of energy in electron beam machining is high velocity electrons, which strikes the surface of the workpiece and generate heat. Electrical conductor materials can be machined. The schematic arrangement of Electron Beam Machining (EBM) is shown in Fig. Electron-beam machining is a kind of machining process by using high-velocity electron beam. It has to be removed afterward by abrasive cleaning. After passing through the magnetic lens, the electron beam passes through the aperture. Electrons hit the workpiece and their kinetic energy is transformed to the thermal energy heating the metal so that the sides of the workpiece can be joined and a weld can be formed after freezing. In the electrical beam machining, electrical energy is used to generate the electrons with high energy. After that, a potential difference is applied across the tungsten filament so that the filament temperature goes around 2500°C. Electron Beam Machining (EBM) General Information. Construction and Working of Electron Beam Machining : 1. Reference : https://nptel.ac.in/content/storage2/courses/112105127/pdf/LM-40.pdf, Manufacturing Technology Notes , Articles, Mechanical Subjectwise Basic Concept Notes ,Articles, Technical Mechanical Interview Question and Answers. In an electronic beam machining, the electrons strike the workpiece with a high velocity. After passing the anode the electrons pass through the magnetic lens. Thus the workpiece to be machined is located under the electron beam and is kept under vacuum. The PD in Watts per unit area is obtained by the following equation: The slotter or slotting machine is also a reciprocating type of machine tool similar to a shaper. Electron gun . Additionally, he has interested in Product Design, Animation, and Project design. Focusing lenses are used to focus the electron beam on the desired spot of the workpiece. Read more about this portal or Sachin Thorat click on below button! The heat energy so produced is used to melt and vaporize the materials from the w/p. The electrons passing through the anode are accelerated to achieve high velocity as half the velocity of light (i.e., 1.6 x 10 ^8 m /s) by applying 50 to 200 kV at the anode. In this article we will discuss about the meaning and characteristics of Electron Beam Machining (EBM) in industries. A telescope and illumination system is used to check whether the beam is rightly placed or not and if not, the deflector coil is used to properly align the electron beam. A high voltage DC power supply is used to generate electrons with high energy in this process. The possibility of an arc discharge between the electrons is prevented. It is an excellent process for micro finishing (milligram/ s). Introduction to Slotting Machine : The following two methods are used in the EBM process. The physical and metallurgical damage to the workpiece is very less. This chamber carries a door, through which the workpiece is placed over the table. enclosed in a vacuum chamber, which carries a vacuum of the order 10-5 to IO-6 mm of mercury. Electron Beam Welding is a liquid state welding process in which two similar or dissimilar metals are joined by the use of heat and that heat is generated by high energy electrons. The kinetic energy of the high velocity electrons is converted to heat energy as the electrons strike the work material. Protect the cathode from chemical contamination and heat losses. The EBM works on the principle that when a high beam of electron strikes a workpiece, the kinetic energy of the electrons is converted into heat energy and this concentrated heat energy raises the temperature of the part of the workpiece at which the electron beam strikes and that part of the workpiece are vaporized and removed from the workpiece. Control of focal distance of the magnetic lens. EBM process has several important applications which explained later on. This concentrated heat raises the. • The electrons are accelerated while passing through the anode by applying high voltage at anode. temperature of workpiece material and vaporizes a small amount of it, resulting in the removal of material from the workpiece. The door is then closed and sealed. 8) Skilled operators are required to operate this machine. This tungsten filament acts as a cathode as the negative terminal of the DC power supply is connected to it. This deflector coil is only used when we are not getting a proper hole or to improve the shape of the machined holes. When the electrons pass through this anode section, the electrons attain a velocity which is nearly half the velocity of light. After that, an electromagnetic lens finally focuses the electron beam on the workpiece. In an electron beam machining, the electrons strike the workpiece with a high velocity. It can also be used for boring of wide range of metals. As the cathode is negatively biased, the electron emitted from the cathode is. Electron beam machining (EBM) uses a focused beam of high-velocity electrons to remove material. The following two methods are used in the EBM process. This will generate high heat energy and melts and vaporize metal from work piece. Anode – which is connected to the positive terminal of the DC power supply. For thicker sheets, multiple pulses would be required. The kinetic energy of the high velocity electrons is converted to heat energy as the electrons strike the work material. This high-intensity heat melts and vaporizes the work material at the spot of beam impact. The kinetic energy of the high velocity electrons is converted … A single pulse is needed to drill a hole in a thin sheet. To avoid collision of accelerated electrons with air molecules. It is particularly useful for machining of materials of low thermal conductivity and high melting point. Electrons escapes from the hot surface and a voltage of 50 to 200 kV helps to accelerate them. In electron beam welding, the kinetic energy of the electrons is converted into heat as they strike the workpiece. 4. These operations include drilling, perforating, slotting, and scribing, etc. After the electrons pass the bias grid, the electrons reach the anode and as the electrons are negatively charged and there is a potential difference between the anode and the cathode, the electrons are accelerated as they pass the anode. The workpieces melt and flow together as the kinetic energy of the electrons is transformed into heat upon impact. When high-speed electrons in a densely focused beam impact with the workpiece surface, most of the kinetic energy of the electrons is converted into heat energy. In machine tool: Electron-beam machining (EBM) The EBM technique is used for cutting fine holes and slots in any material. 1) EBM process is used to remove small broken taps from holes.2) It is also used for making fine gas orifices in space nuclear reactors.3) Used for making turbine blades for supersonic aero engines.4) It is also used to manufacture field emission cathodes, integrated circuits, and computer memories.5) Used for making drawing dies and flow orifices.6) Used for frilling synthetic jewels in the watch industry.7) Used for micro-machining of thin materials. This bias grid is also negatively biased so that the electrons do no get collected on it. Electron beam welding (EBW) is one another form of the fusion welding process or power beam processes, in which the melting and joining of metals is done by heating them with an high velocity electron beam. After striking the electron to workpiece the kinetic energy of the electron changes it into heat energy. 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