Nptel, online courses and certification, learn for free. What are the advantages of wjc over conventional cutting methods. A comparative study of process parameters in the selection of nontraditional machining ntm processes for optimization 9 process utilizes highly collimated, monochromatic and coherent light beam to melt and evaporate the work material. Because of point cutting wjc is able to cut materials almost any pattern.
This paper presents a new method in machining of materials using cavitation process. Work material soft and nonmetallic materials tool water or water with. Brief overview and introduction to electrochemical machining, electrode discharge machining, ultrasonic machining, abrasive jet machining, material removal r. Hybrid machining processes hybrid productionmanufacturing means the combination of processesmachines in order to produce parts in a more efficient and productive way. Courses introduction to abrasive machining and finishing processes. Hybrid machining is a manufacturer of fastener machinery to make a single product out of two operations or two different raw materials. Lecture series on manufacturing processes ii by prof. Edm uses electrical energy to generate electrical spark which travels through a dielectric fluid at a controlled distance. Wjc will not burn surfaces or produces a heat an affected zone. In edm material removal takes place as a result of occurring plasma channel erosion effect between tool electrode and workpiece surface, separated by dielectric.
This chapter has summarized some important aspects of the literature on hybrid machining processes. The main reasons for choosing nontraditional machining processes are. What is hybrid manufacturing and classification of hybrid. Electro discharge machining edm is an electrothermal and nonconventional machining process, where material is removed due to thermal energy of the spark. 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. Conventional and non conventional machining processes. Nonconventional machining processes as viable alternatives for production with. Difference between conventional machining and nontraditional machining ntm pintu 27042019 ntm by definition, machining is one of the secondary manufacturing processes by which excess material is gradually removed by shearing from a preformed blank in the form of solid chips using a wedge shaped cutting tool in order to get desired shape. The basic idea behind a hybrid machining process is the synergistic combination of constituent machining processes in order to overcome their individual shortcomings and achieve effective material removal. 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.
Two of the three outcomes are no desirable, which further leads to. The following examples are provided where ntm processes are preferred over the conventional machining process. Ppt advanced and hybrid machining process powerpoint. Non traditional 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. A mechanical conventional single cutting or ma action process can be combined with the respective machining phases of electrodischarge ed in electrodischarge. 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. Unconventional machining process unit 1 introduction prepared by s. Given this, nontraditional machining is widely utilized in responding to modern industrial problems. Electrical discharge surface grinding edsg is one of the variants of hybrid machining processes that involves combining operations of conventional grinding. 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. In recent years some multifunctional machine tools have been developed to implement several mechanical machining operations on one machine in order to rapidly and economically fabricate those componentsproducts while research has also been drawn on the development of hybrid machines which will integrate conventional and nonconventional. Applications of a hybrid manufacturing process for. 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.
Traditional machining methods are often ineffective in machining hard materials like ceramics and composites or machining under very tight tolerances as in micromachined components. The need to a avoid surface damage that often accompanies the stresses created by conventional machining. No conventional nonconventional 1 direct contact of tool and workpiece. Superposition of ultrasonic vibrations in deep hole drilling enables improved process cycles, even under the difficult conditions of minimum quantity lubrication. 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. The limitations of conventional machining processes. The former onesprovide basic shape and size to the material as per designers requirement. Chapter 18 lean manufacturing pennsylvania state university. Manufacturing processes i nptel online videos, courses. Chapter 2 overview of hybrid machining processes iit kanpur. Nonconventional machining methods also provide very good quality of surface finish which may also be an encouragement to these methods.
Lecture on non conventional machining process by mech zone. A mechanical conventional single cutting or ma action process can be combined with the respective machining phases of electrodischarge ed in. The machining medium is solid grains suspended in an abrasive slurry in the former, while a fluid is employed in the wjm process. Non traditional abrasive machining processes ultrasonic, abrasive jet and abrasive water jet. Machining processes, which include cutting, grinding, and various non mechanical chipless processes, are desirable or even necessary for the following basic. Hybrid machining processes or, more general, advanced machining processes can be brought to the point that the results would not be possible with the individual constituent processes in isolation. Hybrid machining process hybrid machining process hmp. Manufacturing processes can be broadly divided into two groups and they are primarymanufacturing processes and secondary manufacturing processes. Machining centers machining center highly automated machine tool capable of performing multiple machining operations under cnc control.
In the above overview on hybrid processes the processes presented in this brochure are written in blue letters. Unconventional machining processes introduction and. Using hybrid processes, existing technological process limits can be extended by combining additional sources of energy and conventional existing machining processes. This paper summarizes the current development of the hybrid process to process high temperature metallic materials, including tool. Tools are nonconventional technique like laser beam, electric arc etc.
Feed marks are not present in which of the following machiningfinishing process. For example, abrasive water jet operations use mechanical energy, but material is removed by erosion. Material is removed from a surface by chemical dissolution. What is hybrid manufacturing and classification of hybrid machining process technological improvement of machining processes can be achieved by combining different machining actions or phases to be used on the material being removed. Hybrid machining processes hybrid production manufacturing means the combination of processesmachines in order to produce parts in a more efficient and productive way. 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. Electro chemical discharge machining ecdm is a hybrid non conventional manufacturing process which combines the features of electro chemical machining ecm and electro discharge machining edm. The electrodischarge machining process was introduced to industry the 1950s. Introduction to nontraditional machining iit kanpur.
These processes are generally used when traditional methods are not technically or economically feasible. Nonconventional machining processes selection using multiobjective 1449 journal of engineering science and technology november 2015, vol. Learn for free, pay a small fee for exam and get a certificate. Reasons for developing this process are to make use of the combined or mutually enhanced advantages, and to avoid or reduce adverse effects. These methods can be classified as the basis of their base principle of working. Chemical machining, basically an etching process, is the oldest nontraditional machining process. For each hybrid machining process the method of material removal. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses.
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. Nptel provides elearning through online web and video courses various streams. Based on the major mechanism causing the material removal process, two categories of hybrid machining processes are introduced. One possibility of vibrationsuperimposed machining is the. Paul,department of mechanical engineering, iit kharagpur. Fraunhofer iwu hybrid machining processes in cutting. Laser micromachining and laser milling are two different categories of lbm process. Therefore, the hybrid process is potentially a very competitive process to fabricate and repair metallic structures. Amps and their combination with conventional or unconventional machining processes can be used for process improvement. Any nonwork time waiting for tools, supplies, parts, etc figure 18. Hybrid machining processes in cutting technology fraunhofer iwu. In this sense, they are no more unconventional or nontraditional. 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.
A new nontraditional machining method using cavitation. Conventional machining uses tools, such as lathes, milling machines, boring machines, drill presses, or. 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. 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. Automatic tool changer pallet shuttles automatic workpart positioning cnc turning center.
The first structural composite aircraft components, which were introduced during 195060, were made from glass fibre reinforced plastics. Unlike other, nonconventional energy sources laser beam source of energy can also be used as assistance during conventional machining of difficulttomachine materials. The laser hybrid machining processes have been found superior to a single nonconventional machining technique in various machining applications. 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.
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