In electric discharge machining process an arc is produced when two currentcarrying wires are shortcircuited. Today we shall discuss about a new process which is. Gandhi assistant professor, department of mechanical engineering, indian institute of technology, bombay, mems. Soft lithography electron beam lithography xray lithography ion beam lithography dip pen lithography. Ppt laser beam machining powerpoint presentation free. Edm machining process is also known as spark erosion machining. Lecture 22 electro chemical discharge machining ecdm lecture 23 laser beam machining lbm lecture 24 equipment and process parameters in lbm lecture 25 electrochemical machining ecm lecture 26 ecm kinematics and tool design lecture 27 the subsystems in ecm, advantages and applications lecture 28 variant processes in ecm.
Ppt laser beam machining lbm powerpoint presentation. At cathode the hydrogen ions takes electrons and gets converted into hydrogen gas. A laser beam is a nonconventional machining method in which the operation performed by the laser. Laser beam machining or more broadly laser material processing deals with machining and material processing like heat treatment, alloying, cladding, sheet metal bending etc. Welcome to the course on advanced machining process. The process used thermal energy to remove material from a metallic surface. Lecture series on manufacturing processes ii by prof. Laser beam machining lbm is a non conventional machining manufacturing process, a form of machining, in which a laser is directed towards the work piece for machining. Laser beam machining lbm is one of the most widely used thermal energy based noncontact type advance machining process which can be applied for almost whole range of materials. Electron beam machining ebm and laser beam machining lbm are thermal processes considering the mechanisms of material removal. Certain arc and oxyfuel processes are also used for cutting metals. This beam can be focused by means of a lens on a very small spot in the work piece.
Laser beam machining used light energy from a laser to remove material by vaporization and ablation energy is concentrated optically laser emits either continuous or pulsed light beam 5 source. It is a nontraditional machining process in which no physical tool is used. Plasma is defined as a gas that has been heated to a sufficiently high temperature to become partially ionized and therefore electrically conductive. Sinha department of mechanical engineering iit kanpur email. Microsystem fabrication with advanced manufacturing. During this machining process, a small portion of metals is also eroded away, leaving a small cater. Welcome to this second session on laser beam machining under the. Advanced manufacturing processes video lectures nptel videos.
The focused beam in vaporization cutting first heats up the. The term plasma, as employed in physics, means ionized particles. This will generate high heat energy and melts and vaporize metal from work piece. Laser beam machining is a thermal machining process which uses laser beam to produce heat. Advanced manufacturing processes mechanical engineering course from iit roorkee nptel lecture videos by dr.
In this machining process metal is removed by melting and vaporization of metal particle from surface of work piece. Principally electrochemical machining is similar to electropolishing where the work piece surface roughness decreases due to the conversion of the atoms into ions and their removal from the surface as a result. Advanced machining processes online course video lectures. Advanced manufacturing processes free video lectures. All aspects of mechanical, electrochemical and thermal processes are comprehensively covered. Now when you are using the long pulse laser beam for micromachining processes, there are. However in electrochemical machining there is a physical tool that is very much required for machining in ntm, the tool need not be harder than the work piece material.
Electron beam ebm and laser beam machining lbm are newer. Cutting laser cutting is able to cut faster and with a higher quality then competing processes. This course covers lessons in tool geometry, mechanism of chip formation, orthogonal and oblique cutting, cutting temperature, control of cutting temperature and cutting fluid application, advanced tool materials, abrasive process, gear manufacturing, electro chemical machining, electro discharge machining, electron beam machining and laser. Laser beam machining lbm is one of the advanced machining process for material removal. Ramesh singh polarization polarization should have no effect on laser welding since the beam is absorbed inside a keyhole and hence it should be absorbed regardless of the plane of polarization unlike cutting some second order events have been noted by beyer et al. It is a gas laser built by ali javan at mit, with a wavelength of 632. This process uses thermal energy to remove material from metallic or nonmetallic surfaces. Jain, department of mechanical engineering, iit kanpur. Nptel provides elearning through online web and video courses various streams. Now electron beam machining is mostly done in the vacuum atmosphere for the very simple reason i will show you. These videos are provided by nptel elearning initiative.
Lecture 37 introduction of laser beam machining process. The laser stand for light stimulated emission of radiation. Welcome to this session on laser beam machining under the course advanced. Nptel video courses pack pdf format nptel user pack. Lecture 40 electron beam machining and laser beam machining. Laser beam machining lbm is an excellent material processing technique to machine a wide range of advanced materials, especially difficulttomachine advanced ceramics and composites. Electro chemical discharge machining ecdm laser beam machining lbm equipment and process parameters in lbm electrochemical machining ecm ecm kinematics and tool design the subsystems in ecm, advantages and applications variant processes in ecm.
Lbm can be used to process these materials with intricate shapes and. Laser beam machining process uses highly coherent light source. Sharma, department of mechanical engineering, iit roorkee. Singh, balbir singh modern machining processes presents unconventional machining methods which are gradually commercial acceptance. Ecg, ech, ecde and stem electron beam, plasma beam and ion beam machining. Among thermal removal methods, electrical discharge machining or edm is the oldest and most widely used. Electron beam machining is same as laser beam machining process in which except laser, high speed electron beam impinges on work piece.
So, we will discuss these processes also this a only one lecture is a sign for that. Paul,department of mechanical engineering, iit kharagpur. Such processing is carried out utilizing the energy of coherent photons or laser beam, which. The laser beam machining is essentially based on the effects generated at the contact of the workpiece surface with a laser beam that has adequate energetically and spatial temporal characteristics and is directed and focused or defocused by means. Today we will learn about laser beam machining principle, working, equipments, application, advantages and disadvantages with its diagram. Plasma arc machining pam plasma arc machining is a nontraditional thermal process. Laser beam machining lbm is one amongst the foremost widely used thermal energy based noncontact kind advance machining method which may be applied for nearly whole vary of materials. Laser beam cutting is superior to any cutting method conventional or nonconventional because of material versatility, no wear or change of tool, high material utilization and production flexibility and high accuracy and.
Laser beam machining an overview sciencedirect topics. These methods form a group of processes which removes excess material by various. Introduction of laser beam machining process digimat. In thermal removing processes, thermal energy, provided by a heat source, melts or vaporizes the volume of the material to be removed. Tool electrodes and dielectric fluids and electron beam machining lecture 35 mechanics of electron beam machining process lecture 36 functional characteristics of ebm process edit lesson lecture 37 introduction of laser beam machining process lecture 38. Electrochemical machining is a process of a selective dissolution of the anodically connected work piece material submerged in an electrolyte together with an anodically connected tool.
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