The characteristics of this process are similar to those of explosive forming. Introduction super plastic forming is a metalworking process for forming sheet metal. The journal of the institute of explosives engineers march 2014 explosives engineering professional affiliate of the engineering council uk. Form the tensile test data, we can determine flow stress, though this method has limitations. Nptel mechanical engineering forming sheet metal operations other sheet. Pdf tno is involved in development of the explosive forming technology for the fabrication of metal sheets and plates. In order to manufacture a machine component, such as a wheel suspension arm for a car, one can choose metal forming, casting, or machining as the shaping method. Manufacturing companies producing metals supply metals in form of ingots which are obtained by casting liquid metal into a square cross section. Nptel syllabus marine construction and welding video course course outline. 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.
Explosive welding an overview sciencedirect topics. 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. You will find all pdf s and also as mp3 file for all video lectures which are in nptel. It is an impulse or highvelocity forming method using pulsed magnetic field by application of lorentz forces to the work piece preferably made of highly electrically conductive material without having working medium and mechanical contact. Explosive forming can be used to easily produce difficulttomanufacture components.
High velocity forming comparison with conventional forming. 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. A punch in conventional forming is replaced by an explosive charge. Predicting the blast pressure on explosive forming process by. Metal forming processes full notes ebook free download pdf. Studies on water hammer forming on sheet metal works. Chandramouli associate deanresearch sastra university, thanjavur6 401. In the process of explosive welding, the impact of two plates is accompanied, as a rule, by a stationary periodic process leading to a characteristic modulating waved interface see fig. Practically all metals, which are not used in cast form are reduced to some standard shapes for subsequent processing. Materials are subjected to complex states of stresses during forming. The major difference, however, is that a chemical explosive is replaced by a capacitor bank, which stores the electrical energy. Explosive forming is a process of forming any metal into a desired shape by the use of blast pressure. In comparison to explosive forming the discharge technique, techniques are easier, safer and need not be performed in remote areas because that is explosion will be generally allow to take place inside a medium that is liquid medium or so. Unitv unconventional forming processes, principle, working and applications of high energy forming processes such as explosive forming, electromagnetic forming, electrodischarge forming, water hammer forming, explosive compaction etc.
Materials which do not become brittle at higher strain rates alone can be explosive formed. High energy rate forming herf processes introduction. To be even more precise, explosively formed projectiles efp are weapons of war that, before hitting their target, use high explosives to alter. All the important events take place in the vicinity of point a, which runs behind the detonation front see fig. Stress required for forming, yield or flow stress therefore depends on several factors, such as strain, strain rate, temperature etc. Ramji 3 1 associate professor, aaditya institute of technology and management, tekkali, srikakulam 2 assoc professor, mechanical engineering dept. 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. Explosive forming in explosive forming, controlled explosive reactions enable the forming in sheet metals and other metallic products, where the rate of. These three shaping methods can be considered competing processes. Since the forming of the metal occurs so quickly, desirable materials for herf will be ductile at high deformation speeds. Manufacturing processes i nptel online videos, courses. Certainly, the conditions for forming the cumulative jet occur periodically here. Explosive forming is a metalworking technique in which an explosive charge is used instead of a punch or press. The present course intends to give the exposure of various methods of producing thread, gear manufacturing processes as well as semi automats and automats and unconventional.
Multishot explosive forming is sometimes carried out automatically the charges are fed in from a special supply bunker. You can find them according to your branch and subject in the below link national mission on education through ict this was initiated by iit madras. Nptel syllabus advanced manufacturing processes web 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. Improved lubrication if lubricating film is maintained. Nptel, an elearning initiative by the 7 indian institutes of technology and the indian institute of science with the support of the mhrd, govt. Explosive forming unconfined type or stand off technique explosive forming confined type or contact technique the pressure pulse or shock wave produced is in direct contact with the work piece usually tubular and hence the energy is directly applied on the work without any water medium. In contrast, aryldiazonium salts are more stable, though still dangerously explosive under certain conditions, because s n 2 is geometrically impossible and does not occur, while s n 1 occurs with much greater difficulty compared to alkyldiazonium species due to difficulty in forming the high energy aryl cation and stronger csp 2n bond.
Studies on water hammer forming on sheet metal works lingaraju. Explosive forming, however, is not necessarily a replacement for conventional metal forming techniques. The ability to quickly prototype a unitized figure 4. Sharma, department of mechanical engineering, iit roorkee.
Oxygen carriers assure complete oxidation of the carbon in the explosive mixture, which inhibits the formation of carbon monoxide. If one thinks of the hammer blow of an oldtime, brawnyshouldered blacksmith on a glowing piece of iron, one gets a mental image of explosive forming, rather than of a fine machinist using a precise machine to turn screw threads on a part of a gun. Jun 04, 2018 explosive forming youtube, explosive forming nptel, explosive forming learn and grow, forming, metal forming high energy rate forming process ppt high energy rate forming process. Explosive forming is a type of metalworking that can be used to shape very large workpieces. For titanium and refractory in explosive metalworking processes, this report metals, forming at elevated temperatures is. Predicting the blast pressure on explosive forming process. 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. Divided into three parts, this book lays emphasis on explaining the logic and physics. Nov 17, 2014 advanced manufacturing processes by dr. Explosive forming a method of forming metals, mainly sheet metals, in which pressure is created by the force of the blast of a high explosive, powder, or gaseous mixture through a transmitting medium. Mar 25, 20 super plastic forming and explosive forming 1. Me6302 manufacturing technologyi previous year question. So, here what is being done is generally there will be some explosive. E mechanical engineering, second year 3rd semester me6302 manufacturing technologyi previous year question papers for the regulation 20.
Rolling 99% content is from mechanical metallurgy dieter slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The forming processes are affected by the rates of strain used. Explosive forming process high energy rate forming process. It works upon the theory of super plasticity, which means that capability that some materials have. Explosive forming of met als summary in view of the current high level of interest residual stresses. Form the tensile test data, we can determine flow stress, though this.
Explosive forming definition of explosive forming by the. Download me6302 manufacturing technology i books lecture notes syllabus part a 2 marks with answers me6302 manufacturing technology i important part b 16 marks questions, pdf books, question bank with answers key, me6302. A lower heat of explosion means a lower energy output and thereby less efficient blasting. Introduction to explosives and propellants part of the text from parti of this chapter has been presented. Nptel mechanical engineering forming sheet metal operations. High energy rate forming is the forming of sheet metal by a high energy surge, delivered over a very short time. High velocity forming forging explosive material scribd. Manufacturing technology high velocity forming forging.
Rubber pad forming metal spinning introduction to explosive forming, magnetic pulse forming, peen forming, super plastic forming. If you continue browsing the site, you agree to the use of cookies on this website. This process can deliver a great deal of flexibility in the metalforming process. This must be accounted for and compensated for in a welding operation. What are the requirements for superplastic forming. How to download all of the lectures in pdf for a course in. So, these are explosives being used and they are being detonated suitably, so they are. Me6302 manufacturing technologyi previous year question papers february 23, 2018 may 25, 2019 syed afrith b.
What is the consideration of strain rate in explosive forming. Explosive forming is an ideal process for producing low volumes of very large metal part with low tooling costs. Nitrogen tetroxide n2o4 is another liquid oxidizer capable of forming powerful explosives. Explosively formed projectile encyclopedia article. Tno is involved in development of the explosive forming technology for. Explosive forming process high energy rate forming. The velocity of an explosive, such as ammonium nitratefuel oil anfo, will vary typically with the depth, run length of the explosive used, and confinement. The oxygen carriers assist in preventing a lowering of the exploding temperature. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses. An explosive charge is used instead of a press or punch. Explosive welding can be considered as a kind of hotpressing.
Sheet metal operations other sheet metal forming processes nptel. Book description basic mechanical engineering covers a wide range of topics and engineering concepts that are required to be learnt as in any undergraduate engineering course. Detonation occurs when the rate of chemical decomposition is greater than the speed of sound. Sheet metal operations other sheet metal forming processes. For titanium and refractory in explosivemetalworking processes, this report metals, forming at elevated temperatures is. Introduction to machine design, methodology, strength, rigidity, fracture, wear, and material considerations in design, use of standards, selection of materials and processes. Nptel mechanical engineering forming joint initiative of iits and iisc funded by mhrd page 1 of sheet metal operations other sheet metal forming processes r.
Manufacturing technology high velocity forming free download as powerpoint presentation. From the uniaxial tensile test, one can understand material behavior considerably. Sometimes called explosive hydroforming, a workpiece and explosive is placed in a tank of water. Explosive education and certification of skills 2014 this years iceecs is likely to take place on. High velocity forming free download as powerpoint presentation. 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. Detonation of the explosive forces the workpiece to assume the shape of the tool. Explosives engineering home institute of explosives. 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. Pdf me6302 manufacturing technology i books, lecture. The temperature of work is increases due to adiabatic heating. Mod1 lec12 high energy rate forming processes youtube.
Explosive forming, magnetic pulse forming and electro hydraulic forming come under. 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. Rajkumar, assistant professor, kalasalingam university. Nptel mechanical engineering forming joint initiative of iits and iisc funded by mhrd page 3 of. Explosive forming article about explosive forming by the.
1449 1465 1444 85 831 1146 476 207 717 1036 131 1269 1063 707 407 556 100 764 856 277 113 266 202 731 612 317 1152 1401 1465 253 1259 107 1243 335 912 1304 29 965 931 1119 312 513 714 1298