Explosive forming nptel pdf merge

Explosive forming operations can be divided into two groups, depending on the position of the explosive charge relative to the workpiece. Then the problem is the time required will also be high, then and another problem is the spring back problem. Press brake forming, explosive forming, hydro forming, electro hydraulic forming, and magnetic pulse forming. Improved lubrication if lubricating film is maintained. Predicting the blast pressure on explosive forming process by. Abstract in an effort to recover polychlorinated biphenyls pcbs that had leached into bedrock below the. Explosive forming process high energy rate forming. A glance at any business newspaper or business news web page will indicate that mergers and acquisitions are big business and are taking place all the time. Explosive forming explosives can deliver a huge amount of power. For many warheads that energy is stored in the form of chemical explosives.

Nptel mechanical engineering forming joint initiative of iits and iisc funded by mhrd page 3 of. The oxygen carriers assist in preventing a lowering of the exploding temperature. Consequently no cast nuggets or brittle inter metallics are formed in ultrasonic. Form the tensile test data, we can determine flow stress, though this. Applications and capabilities of explosive forming article in journal of materials processing technology 125. Nptel mechanical engineering forming joint initiative of iits and iisc funded by mhrd page 7 of 10 friction.

Explosive welding can be considered as a kind of hotpressing. Download as ppt, pdf, txt or read online from scribd. Unlike other videos in this series, this video is not licensed under a creative commons license, due to restrictions required by the included images creatordistributor. High energy rate forming high energy rate forming is the forming of sheet metal by a high energy surge, delivered over a very short time. Unconventional forming explosive material inductor. How will you classify non conventional manufacturing processes. Explosive welding an overview sciencedirect topics. He has contributed lectures on algorithms to the massively empowered classroom mec project of microsoft research and the qeee programme of mhrd. Studies on water hammer forming on sheet metal works.

The temperature of work is increases due to adiabatic heating. Some common metal forming processes are schematically given in fig 1. Explosive forming can be utilized to form a wide variety of metals, from aluminium. Nptel mechanical engineering forming sheet metal operations. Explosive forming extrusion and drawing of porous solids. Manufacturing technology high velocity forming free download as powerpoint presentation. Explosive welding or cladding is usually performed on relative thick plates by means of a large scale parallel plate setup.

Forming web course course outline stress strain relations, stress and strain transformations, elastic and plastic behaviour, yield criteria, elementary principles of metal forming cold, hot and warm working, effect of parameters such as temperature, strain rate, friction. Nptel online certification courses since 20, through an online portal, 4, 8, or 12week online courses, typically on topics relevant to students in all years of higher education along with. Detonation occurs when the rate of chemical decomposition is greater than. An explosive charge is used instead of a press or punch. Manufacturing systems management nptel online videos, courses iit video lectures. Applications and capabilities of explosive forming request pdf. Let us form an algorithm for insertion sort which sort a sequence of numbers.

Explosive forming can be used to easily produce difficulttomanufacture components. The explosive energy replaces the male part of the tool that is used in regular forming processes. Lecture 11 12 industrial gases carbon dioxide distillation. Explosives engineering explosive related systems and both natural and built structure. From the uniaxial tensile test, one can understand material behavior considerably. This process can deliver a great deal of flexibility in the metal forming process. Practically all metals, which are not used in cast form are reduced to some standard shapes for subsequent processing. Introduction explosive welding is a solid state metal joining. The forming processes are affected by the rates of strain used.

Metal casting is a labour intensive process automation. So, in the very first point, it has been addressed that how explosive forming is different from the. The various stimuli to which explosives respond and the mannci. Because of this flexibility, explosive forming has historically been employed in the aerospace industry for prototyping of. A lower heat of explosion means a lower energy output and thereby less efficient blasting. It works upon the theory of super plasticity, which means that capability that some materials have. Unconventional forming free download as powerpoint presentation. This calls for an extension of the classical analysis quasistatic of forming processes. Explosives, explosives based on saturated chains comprising straight chain and ring compounds, alkadienes and aromatic compounds, detonation in explosives. Mechanical engineering manufacturing processes i nptel.

Advanced forming processes electromagnetic forming, explosive forming, electrohydraulic forming, stretch forming, contour roll forming. Apr 07, 20 nptel was the brainchild proposal which was put forward by the five main iits national program in technology enhanced learning nptel. Explosive forming, magnetic pulse forming and electro hydraulic forming come under. Form the tensile test data, we can determine flow stress, though this method has limitations. High energy rate forming herf processes introduction.

So, these are explosives being used and they are being detonated suitably, so they are. The popularity of silicon for such application is primarily for the following reasons. Here the explosive is in the form of cylindrical package, enclosed in paper or polythene tubings. The charge drives the dieplate into the metal, which is backed by the reciprocal plate. The explosives are far from safe, and by doing so your life is at risk.

Single crystal silicon is the most widely used substrate material for mems and microsystems. Explosives commonly require some stimulus, like a blow or a spark, to provoke them to liberate their energy, that is, to undergo the change which produces the explosion, but the stimulus which sets off1 the explosive does not contribute to the energy of the explosion. Oxygen carriers assure complete oxidation of the carbon in the explosive mixture, which inhibits the formation of carbon monoxide. Condensed phase explosives based on fulminates, azides, acetalide, and stephnates, characteristics of condensed phase explosives, enhancement of energetics, plastic.

Email print pdf such as ocean engineering, biotechnology, mining and metallurgy. Explosive forming is a type of metalworking that can be used to shape very large workpieces. Early patents relating to explosive forming appeared at the end of the 19th and at the beginning of the 20th century. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses. At tnopml several of the explosive welding configurations that were.

Explosive forming is a process of forming any metal into a desired shape by the use of blast pressure. Nptel syllabus advanced manufacturing processes video course course outline the course covers the details of the advanced machining theory and practices, advanced machining processes, advanced metal forming processes, advanced welding processes and advanced foundry processes. High velocity forming forging explosive material scribd. Explosive operations for constructing a tunnel based pcb. The pressure of this shock wave is sufficient to form metal sheet. Lecture 11 12 industrial gases free download as powerpoint presentation. A definite quantity of explosive is placed suitably in water medium at a definite stand off distance from the. Nptel syllabus introduction to explosions and safety video course. The course is meant as an introduction towards primary manufacturing processes such as casting, forming and welding. The phenomenon, discovered by lavrentiev at the end of the ww ii 122, is an efficient way to bond together two similar or dissimilar materials. Manufacturing processes i nptel online videos, courses. Black powder, for example, may burn in the open air. The peak pressure, p, due to explosion, generated in water, is given by expression p k w12ra where p is in psi.

The course concludes with quantification of damages, some basics of risk analysis, acceptable risks and use of fault. Mergers and acquisitions edinburgh business school ix preface an understanding of mergers and acquisitions as a discipline is increasingly important in modern business. Nptel syllabus introduction to explosions and safety. This technique uses the energy generated by an explosive detonation to form the metal work piece. Explosive forming is a broad term covering many process variations. Explosive forming is old, probably back in the 1940s it was really refined. Since the forming of the metal occurs so quickly, desirable materials for herf will be ductile at high deformation speeds.

It can be used on materials for which a press setup would be prohibitively large or require an unreasonably high pressure, and is generally much cheaper than building a large enough and sufficiently highpressure press. If we combine these factors and put in values for our reference, tnt, we obtain. High velocity forming of metals and high energy rate forming. Forging process analysis and preform design by harshil parikh, bhavin mehta, jay gunasekera department of mechanical engineering ohio university, athens, ohio 45701 rob mayer, president queen city forging company, cincinnati, ohio 45226 abstract the purpose of this paper is to optimize the forging process and reduce the required force. Sheet metal characteristics typical shearing operations, bending and drawing operations stretch forming operations formability of sheet metal test methods working principle and application of special forming processes hydro forming rubber pad forming metal spinning introduction to explosive forming, magnetic pulse forming. Explosive forming article about explosive forming by the. It almost always exists in compounds with other elements. Explosive forming is a process in which forces produced by an explosion are used to shape a workpiece. Makeshift arsenal homemade explosives and improvised weapons version 1. Sharma, department of mechanical engineering, iit roorkee.

Tm technologies faqs explosive forming sheet metal. Metal forming processes full notes ebook free download pdf. Introduction super plastic forming is a metalworking process for forming sheet metal. These are casting, machining, joining welding, mechanical fastners, epoxy, etc. There are two type of techniques of high explosive forming. Chapter i properties of explosives an explosive is a material. Jun 12, 2014 the explosive bonding or cladding of large areas of planar metal or alloy laminates by variations of interlocking weld waves or shallow drx microstructures often resembles rim structures characteristic of ballistic impact craters and penetration channels. Manufacturing companies producing metals supply metals in form of ingots which are obtained by casting liquid metal into a square cross section. Metal casting processes indian institute of technology. Manufacturing systems management nptel online videos. Explosive forming can be used for forming parts on the scale of a few inches to up to 15 feetthe main limitations are the initiation of uniform detonation and the size of the holding tank. Explosively formed projectile encyclopedia article. Unconfined type explosive forming a gas bubble is also produced which expands spherically and then collapses.

Metal spinning, also known as spin forming or spinning or metal turning most commonly, is a metalworking process by which a disc or tube of metal is rotated at high speed and formed into an axially symmetric part. An explosive substance is a solid or liquid substance or mixture of substances which is in itself capable by chemical reaction of producing gas at such a temperature and pressure and at such a speed as to. So, here what is being done is generally there will be some explosive. On the other hand, the investi gations of the reaction products formed at the cladding interface were carried out by means of tem. Explosives are chemical mixtures or compounds that, when subjected to heat, impact, or shock, are capable of undergoing a rapid decomposition that releases heat and gases, which, in turn, expand to form high pressures. The electromagnetic forming technology has unique advantages in the forming, joining and assembly of light. Electromagnetic forming em forming or magneforming is a type of high velocity, cold forming. High velocity forming comparison with conventional forming.

Process the rapid change in explosive in to gas produce a shock wave. Electro hydraulic forming ehf, also known as electro spark forming, is a process in which electrical energy is converted into mechanical energy for the forming of metallic parts. Indian institute of technology, kanpur 1 module 4 lecture 22 pore water pressure and shear strength 6 topics 1. An explosion may occur without an explosive, that is, without any material which contains intrinsically the energy needful to produce the explosion. Applications and capabilities of explosive forming.

Explosive operations for constructing a tunnel based pcb collection system patrick mcalinden, merco inc. Standoff method in this method, the explosive charge is located at some predetermined distance from the workpiece and the energy is transmitted through an intervening medium like air, oil, or water. Chapter i properties of explosives an explosive is a. In addition to the nptel mooc programme, he has been involved in organizing iarcs instructional courses for college teachers. Spinning can be performed by hand or by a cnc lathe. Mergers and acquisitions edinburgh business school.

Huge capacitors are charged up for days, then the charge released into a column of water, which divides into h2, exploding, and o2, which supports the combustion. This is very much associated with all the conventional forming, most of the conventional forming processes applied to sheet metal forming. The ability to quickly prototype a unitized figure 4. The required profile results from the explosive force that directly or indirectly deforms the metal.

Jan 22, 20 explosion welding is a solidstate process that produces a high velocity interaction of dissimilar metals by a controlled detonation slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Mar 25, 20 super plastic forming and explosive forming 1. A weld joint is produced by means of a high velocity impact of one metallic mass onto another, aided by a controlled detonation with an explosive charge. His research interests include development of materials and structures. Electrohydraulic forming and electromagnetic forming topics covered 1 introduction 2 process principle 3 constructional details 4 advantages and disadvanta slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.

In 70s, the explosive welding was intensively used in attempts to develop an economically effective fabrication. Explosive forming in explosive forming, controlled explosive reactions enable the forming. Prasenjit khanikar is an assistant professor of mechanical engineering department at the indian institute of technology, guwahati. Alow explosive material,suchasgunpowder,smokelesspowderorfireworks,burnsmuch slower. Multishot explosive forming is sometimes carried out automatically the charges are fed in from a special supply bunker. Sensitivity is a measure of the ease with which an explosive can be detonated by heat, friction or shock and of its ability to propagate that detonation. Explosive forming, however, is not necessarily a replacement for conventional metal forming techniques. These techniques include methods such as, forgingextrusiondrawingpunchingjoining etc. It is typically used in cases where the metal is too large or thick for a traditional press or punch method to be cost effective. Novel forming by explosive charges in water creating hydroforming environments is presented.

Industrial application of the electromagnetic pulse technology pdf. Let us move on to joining processes which are also called additive. This explosive charge is made to explode and due to the exerted pressure and heat liberated, there will be a deformation on the metal work. Stress required for forming, yield or flow stress therefore depends on several factors, such as strain, strain rate, temperature etc. Explosive forming of a part may be carried out by using large charges in a single explosion socalled singleshot explosive forming or by using a series of small charges multishot explosive forming. Advanced foundry processes metal mould, continuous, squeeze, vacuum mould, evaporative pattern, and ceramic shell casting. Explosive welding, forming, and powder consolidation.

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