Home >> Category >> Mechanical Engineering (MCQ) questions and answers >> Advanced Machining Process 1) The Laser Beam Machining process can be carried out, when the media for energy transfer between tool and workpiece is This is called the lasing action. In this machining process metal is removed by melting and vaporization of metal particle from surface of work piece. Soft materials like rubber and plastics can be machined. The laser light has maximum temperature strikes on the workpiece, due to high temp the workpiece gets melts. Lasers are also use as entertinment in theatres concerts and light show. The machining provided by laser beams is high precision, and most of these processes do not require additional finishing. The laser in short pulses has a power output of nearly 10 kw ‘cm of the beam cross-section. It is a non-conventional machining process in which no tool is used. It does not require vacuum environment. Laser Beam Machining (LBM) process utilizes a coherent beam of laser (photons having same frequency, wavelength and phase) as the heat source for material removal purpose. It finds wide applications in different enterprises like space tech, autos, flight, shipbuilding and numerous others fabricating process. In this machining, metal is removed from workpiece by melting and vapourizing of metal particles in a controlled from its surface using heat from laser. 3. The heat-affected zone is small because of the collimated beam. This radiation of photons is known as spontaneous emission which is extremely rapid. Milling with a laser is a three dimensional process that requires two lasers, but drastically cuts costs of machining parts. In fact, It’s a subtractive manufacturing process in which a laser beam is used for Cutting through the metals and other materials for getting the desired product. Laser Beam Machining or more broadly laser material processing deals with machining and material processing like heat treatment, alloying, cladding, sheet metal bending. Ruby is one of the frequently used host materials in this type of laser. This results in an electron of the atoms of the medium to jump to the upper energy level. The laser can be used for cutting as well as for drilling. By focussing a laser beam on a spot 1/100 of a square mm in size, the beam can be concentrated in a short flash to a power density of 100,000 kW/cm and energy of several joules lasting for a minute fraction of a second. Other applications include steel metal trimming, blanking and resistor trimming. The laser is electromagnetic radiation. 3. Laser beam machining (LBM) is one of the advanced noncontact machining processes that employ monochromatic light with high frequency for machining using thermal energy. In the medical industry it is used for cosmetic surgery and hair removal. Laser Beam Machining: A coherent beam of monochromatic light is focused on the workpiece causing material removal by vaporisation. Though LBM is not a mass material removal process, it is possible to use this process in mass micro-machining production. The laser head is traversed over the workpiece and an operator visually inspects the cut while manually adjusting the control panel. The highly energized photos are focused on a material cause heating, melting and vaporizes the material which is effectively used to remove unwanted portion of a material. Laser beam is focussed for melting and vaporizing the unwanted material from the parent material. Cutting or engraving patterns on the thin films. Electron beam machining is a thermal process used for metal removal during the machining process. d = laser beam spot diameter. Laser welding is by a wide margin the most productive and quick welding system ever. k = constant characterisics of the material and the conversion efficiency of laser energy to the material, mm/min. Laser machining systems are used in conjunction with computer numeric control (CNC), which makes it ideal for use with thin walled tubing, boasting beam widths down to .0005'. So that’s it, we have discussed everything about laser beam machining but still, if you have any doubt or questions you can ask in the comments. The mechanism by which a laser beam removes material from the surface being worked includes a mixture of melting and evaporation process. 5. Laser beam is focussed for melting and vaporizing the unwanted material from the parent material. Laser beam machining has the ability to engrave or cut nearly all materials, where traditional cutting methods may fall short. Laser beam machining (LBM) is a non-conventional Machining manufacturing process, a form of machining, in which a laseris directed towards the work piece for machining. It can ever weld at rates up to 100 mm/sec. Some aspects of laser beam machining process i.e. Laser beam machining is a non-conventional machining process, in which a laser is directed towards the workpiece for machining. This process uses thermal energy to remove metal from metallic or nonmetallic surfaces. [1] Laser beam machining is best suited for brittle materials with low conductivity, but can be used on most materials.[2]. INTRODUCTION Laser beam machining (LBM) is one of the most widely used thermal energy based non-contact type advance machining process which can be applied for almost whole range of material. It is used in the automobile, shipbuilding, aerospace, steel, electronics, and medical industries for precision machining of complex parts. 5. 1. 4. Easy machining of brittle, non-metallic and hard materials. In the electrical beam machining, electrical energy is used to generate the electrons with high energy. The chromium atoms in the ruby are thus excited to high energy levels. Laser beam machining (LBM) is one of the most widely used thermal energy based non-contact type advance machining process which can be applied for almost whole range of materials. Laser beams can be paired with gases to help the cutting process be more efficient, help minimize oxidization of surfaces, and/or keep the workpiece surface free from melted or vaporized material. This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “Laser Beam Machining-Introduction”. The laser is electromagnetic radiation. There are many accessories that aid in the machining process, and as most of these accessories are as important as the laser beam itself the startup cost of machining is raised further. Laser beam machining is a thermal machining process which uses laser beam to produce heat. Lasers can be ussed to cut, drill, weld and mark. Laser beam machining is an advanced thermal energy-based machining process; the process is used in various industrial applications. Laser Beam Machining (LBM) Ion Beam Machining (IBM) LBM is a thermal energy based non-traditional machining process. There are many different types of lasers including gas, solid states lasers, and excimer.[3]. The principle of a laser can be explained as follows: Let us consider that the atoms of a medium (for example, a ruby crystal rod) are at the ground state. He completed his engineering studies in 2014 and is currently working in a large firm as Mechanical Engineer. The depth of the cut is also influenced by the workpiece material. The material removal rate in LBM is comparatively low and is of the order of 4000 mm/hr. In light manufacturing industries, it is used for engraving and drilling other metals. 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