Conventional machining utilizes cutting tools that must be harder than workpiece material. Ultrasonic machining usm and waterjet machining wjm are typical examples of single action, mechanical non traditional machining processes. Lecture on non conventional machining process by mech zone. Conventional machining also costs in terms of tool wear and in loss of quality in the product owing to induced residual stresses during manufacture. Electrochemical machining ecm is a nontraditional machining ntm process. Pdf nonconventional machining processes selection using. Ultrasonic machining national institute of technology. Various similarities and differences between conventional machining and nontraditional machining ntm processes are given below in table format. Selection of nonconventional machining processes using the ocra method article pdf available in serbian journal of management 101 september 2014 with. Jain, department of mechanical engineering, iit kanpur.
Modern machining unit 5 modern machining method method structure 5. Conventional machining processes and machine tools module. Conventional and non conventional machining processes. Hence the machining process which utilizes other machining methods are termed as unconventional machining or nontraditional machining or advanced machining processes or modern machining processes. Certified to weld aluminum, stainless steel 4, carbon and nickel alloys. The above phenomenon causes the machining of guide ways after a certain period,so the downtime machine is so high. Comparison between conventional and nonconventional machining. Traditional machining methods are often ineffective in machining hard materials like ceramics and composites or machining under very tight tolerances as in micromachined components. Apr 05, 2020 pu be mech non conventional machining 6th semester 20 question paper mechanical engineering notes edurev is made by best teachers of mechanical engineering. Taguchi mentioned that high precision and accuracy cannot be achieved using the conventional machining processes.
Introduction we all know that the term machinability refers to the case with which a metal can be machined to an acceptable surface finish. Pu be mech non conventional machining 6th semester 20. Examples of conventional machining processes are turning, boring, milling, shaping, broaching, slotting, grinding etc. Brief overview and introduction to electrochemical machining, electrode discharge machining, ultrasonic machining, abrasive jet machining, material removal rate. Sharma, department of mechanical engineering, iit roorkee. All manufacturing industries, machine tool manufacturing industries, automobile industries and aeronautical assembly industries. Machining operations and part geometry each machining operation produces a characteristic part geometry due to two factors. In electrochemical grinding process we combine that electrochemical machining. Machining is any of various processes in which a piece of raw material is cut into a desired final shape and size by a controlled materialremoval process. History the early ancestors of modern humans, likely first used a jawbone of bovid animals as a saw. Cutting rates for various materials and thicknesses using a co2 laser ipm material thickness 0.
Nonconventional machining processes selection using multiobjective 1449 journal of engineering science and technology november 2015, vol. Ultrasonic machining is a mechanical type nontraditional machining process. My areas of specialization are conventional and non conventional machining, automatic control, hydraulic control, machine tools and manufacturing automation. This document is highly rated by mechanical engineering students and has been viewed 296 times.
The machining medium is solid grains suspended in an abrasive slurry in the former,while a fluid is employed in the wjm process. Fundamentals of machining processes by hassan abdel contains total 16 chapters, such as cutting tools, maintainability, micromachining, high speed machining, abrasives etc. Processes likeabrasive jet machining water jet machininglaser beam machininghot machiningplasma arc machininghave also been included. The processes are non traditional or nonconventional in the sense that they dont employ a conventional or traditional tool for material removal, instead, they directly utilize some form of energy for metal machining. Pdf selection of nonconventional machining processes. Until at least the mid19th century, saws were made laboriously by hand. Chapter 2 overview of hybrid machining processes iit kanpur. Conventional machining dynamic fabrication dynamic. In 1950, he invented first portable saw which has a. Materials are removed by traversing in a direction parallel to the axis of rotation of axis or along a specified path to form a complex rotational shape.
But in case of cnc mc there is a layer of ptfepoly tetra fluro ethylene or turcide. Within the electrolyte iron ions would combine with chloride ions to form iron. Within the electrolyte iron ions would combine with chloride ions to form iron chloride. The improved thermal, mechanical and chemical properties of advanced materials super alloys, composites, and ceramics have created impediments in easy machining of such materials by conventional machining processes namely turning, milling and drilling etc. Edm uses electrical energy to generate electrical spark which travels through a dielectric fluid at a controlled distance. Non traditional machining jagadeesha t, assistant professor, med, national institute of technology. In unconventional machining, a form of energy is used to remove unwanted material from. All aspects of mechanical, electrochemical and thermal processes are comprehensively covered. Manufacturing processes i nptel online videos, courses. Nonconventional machining iit notes free download as pdf file. Introduction as a result of the advances in machine tools and cutting tool technology in recent decades, many of the conventional machining processes such as turning, milling and drilling have become costeffective, flexible and highthroughput manufacturing processes for producing high precision and high. The limitations of conventional machining processes. Unconventional machining process unit 1 introduction prepared by s. This book addresses issues essential to unconventional machining processes, covering all modern machining processes such as mechanical processes, electrochemical and chemical metal removal processes, and thermal metal removal processes.
No conventional nonconventional 1 direct contact of tool and workpiece. With ever increasing demand for manufactured goods of hard alloys and metals, such as inconel 718 or titanium, more interest has gravitated to non conventional machining methods. Similarities between conventional machining and ntm. In this short notes section we will cover the first unconventional machining process electric discharge machining edm. Brief overview and introduction to electrochemical machining, electrode discharge machining, ultrasonic machining, abrasive jet machining, material removal r. Difference between conventional and nonconventional.
Laser properties speed is given by material, its thicknes and power of the machine. Each process has distinct capabilities and is suitable for specific purposes. Conventional machining uses tools, such as lathes, milling machines, boring machines, drill presses, or. New and novel materials because of their greatly improved chemical, mechanical and thermal properties are sometimes impossible to machine using traditional.
Non traditional machining questions and answers sanfoundry. The difficulty to cut materials encouraged efforts that. Please switch to hard cover of fundamentals of machining process. These processes are generally used when traditional methods are not technically or economically feasible. Review of basic machining processes and the mechanics of chip formation. The processes that have this common theme, controlled material removal, are today collectively known as subtractive manufacturing, in distinction from processes of controlled material addition, which are known as additive. Unconventional machining processes form an important part of the chapter of machining processes in the subject of manufacturing engineering for gate mechanical engineering. Nontraditional manufacturing processes is defined as a group of processes that remove excess material by various techniques involving mechanical, thermal, electrical or chemical energy or combinations of these energies but do not use a sharp cutting tools as it needs to be. A new nontraditional machining method using cavitation. Machining centers machining center highly automated machine tool capable of performing multiple machining operations under cnc control.
Unconventional machining processes introduction and. Machining is a processes in which a piece of raw material is cut into a desired final shape and size by a controlled materialremoval process. Brief introduction of nonconventional machining processes. Both are machining processes and thus used for removing excess material. Machining our machine room is equipped with a range of mills, horizontal grinders, drills and ancillary equipment allowing us to undertake small batch and prototype development work. Electro discharge machining edm is an electrothermal and nonconventional machining process, where material is removed due to thermal energy of the spark. In 1926, the first saw which worked with electricity was invented by andreas stihl.
Conventional machining in support of our core business activities we undertake general engineering services including the following. All questions carry equal marks 1 a classify unconventional machining processes based on basic mehanism involved in the process and medium for tranfer of enrgies and type of energy. Conventional machining processes and machine tools moduleiv turning turning operation is a machining process and is used to produce round parts in shape by a single point cutting tool. Non directional surface texture is possible compared to conventional grinding 8. Unconventional machining production engineering i meng 3221 introduction machining processes produce finished products with a high degree of accuracy and surface quality. Machining processes, which include cutting, grinding, and various nonmechanical chipless processes, are desirable or even necessary for the following basic reasons. Nontraditional machining, utilizing electrical, chemical, and optical sources of energy. The precise meaning of the term machining has evolved over the past two centuries as technology has advanced. Relative motions between the tool and the workpart generating part geometry is determined by the feed trajectory of the cutting tool 2. The need to a avoid surface damage that often accompanies the stresses created by conventional machining. The introduction of abrasives to the fluid jet enhances the.
Nonconventional machining iit notes machining composite. An unconventional machining process or nontraditional machining process is a special type of machining process in which there is no direct contact between the tool and the workpiece. Non conventional machining processes enable us to get consistency and accuracy in our desired manufacturing techniques. Cutting tool is harder than work piece at room temperature as well as under machining conditions non conventional manufacturing processes is defined as a group of processes that. Machining of frps may take place before andor after layup and curing. The main reasons for choosing nontraditional machining processes are. Nontraditional machining processes are widely used to manufacture geometrically complex and precision parts for aerospace, electronics and. These new techniques of machining known as nonconventional machining processes, are diverse in nature and differ from each other by their characteristi c features, operati.
The aim of the mtcs nonconventional machining ncm theme is to provide efficient, costeffective solutions for the manufacture of traditionally difficult to machine materials using stateoftheart spark erosion and laser technologies. Guest post mechanical projects concepts cracker machine. Nontraditional manufacturing processes or unconventional machining processes conventional machining processes mostly remove material in the form of chips by applying forces on the work material with a wedge shaped cutting tool that is harder than the work material under machining condition. In this sense, they are no more unconventional or nontraditional. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses. Introduction to nontraditional machining iit kanpur. In 1927, emil lerp invented a saw that works with using oil in germany.
Modern machining processes presents unconventional machining methods which are gradually commercial acceptance. Raditional machining processes are kinds of machining in which the removed materials from the workpiece surface are in the form of chips. Tools are nonconventional technique like laser beam, electric arc etc. Thus, high degree of precision and accuracy cannot be achieved. The reinforcement material is either dry or resin impregnated fibers, fiber weaves, and fabrics. Shape of the cutting tool forming part geometry is created by the.
Introduction conventional machining process metal is removed by means of tool which is harder than work piece and they both are in contact with each other demerits of conventional machining process. The machining before curing involves cutting the reinforcement material to the proper size to fit the contour before it is laid inonto a mold and cured. Dynamic fabrication is as9100 rev d iso 90012008 certified. Conventional machining technology fundamentals introduction.
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