The term nontraditional machining refers to the group of material removal techniques that removes excess material involving mechanical, thermal, electrical, or chemical energy (or combinations of these energies) and without the use of a sharp cutting tool in the conventional sense.
non conventional machining processes pdf download
Electric Discharge Machining- In electric discharge processes, The work material is removal of work material by a series of sparks causing localized melting and evaporation of the material on the work surface takes place in electric discharge machining. Electrically conducting work materials are the only materials upon which these processes could be used.
Das, P. P., & Chakraborty, S. (2022). Application of grey correlation-based EDAS method for parametric optimization of non-traditional machining processes. Scientia Iranica, 29(2), 864-882. doi: 10.24200/sci.2020.53943.3499
P. P. Das; S. Chakraborty. "Application of grey correlation-based EDAS method for parametric optimization of non-traditional machining processes". Scientia Iranica, 29, 2, 2022, 864-882. doi: 10.24200/sci.2020.53943.3499
Das, P. P., Chakraborty, S. (2022). 'Application of grey correlation-based EDAS method for parametric optimization of non-traditional machining processes', Scientia Iranica, 29(2), pp. 864-882. doi: 10.24200/sci.2020.53943.3499
Das, P. P., Chakraborty, S. Application of grey correlation-based EDAS method for parametric optimization of non-traditional machining processes. Scientia Iranica, 2022; 29(2): 864-882. doi: 10.24200/sci.2020.53943.3499
In the modern era of manufacturing, unconventional machining methods are quite popular due to various advantages such as high accuracy, excellent surface finish, less tool wear, much quieter operations, among others. Moreover, new age and novel materials are sometimes hard to machine with traditional machining processes due to their high strength and brittleness.
Advances in Nonconventional Machining Processes covers recent development in such methods. Chapters have been contributed by many authors and provide detailed information about machining processes (ultrasonic machining, thermally enhanced machining and electronic discharge machining, to name a few). Additional chapters that provide information about novel materials and their fabrication as well as innovations in machining methods (including the use of machine learning techniques) which have long been established on an industrial scale are also included in the book.
Advances in Nonconventional Machining Processes is a reference work suitable for apprentices and academic scholars studying manufacturing. Industry professionals who wish to know about cutting-edge developments in machining techniques will also find this a useful handbook for their library.
The Question paper consists of an equally well divided section that holds equal marks. The question paper consists of 100 marks which are divided into five questions each of 20 marks. The paper set contains 7 total questions out of which only 5 are needed to be answered. Questions are based upon the theory of machining processes as well as some practical experiences. These questions are generally long answer type which holds equal marks divided into each part.
Small manufacturing businesses sometimes find conventional machining processes, like CNC milling and turning, are not best suited to what they require. Special applications sometimes call for specialist machining processes. Complex geometry, intricate features, hard, tough or brittle materials - all these unconventional requirements are typical reasons to consider the range of specialist machining processes that exist.
Components can be manufactured to the desired specification with confidence by selecting the most appropriate specialist process. Central to this is the need for design engineers and technicians to raise their awareness of the variety of machining processes available to them.
A clear, succinct range of specialist and advanced machining processes with explanations and diagrams. Examples include Chemical, Electrochemical and Electrical Discharge Machining. Also featured are Laser and Electron Beam Machining, together with Plasma Arc Cutting and Wire EDM. Other techniques include Ultrasonic, Water Jet and Abrasive Jet Machining. The advantages over conventional machining are covered, as are the economics of advanced machining processes.
Unconventional Machining Processes: A range of specialist machining processes explained with technical descriptions and background information. Examples of components and work pieces illustrate the component geometry typically produced with some of the different processes.
How Wire EDM Works: Introduction to Wire EDM and high-speed small hole EDM processes. Short, interesting video on the fundamentals of the electrical discharge machining process. Parts and diagrams are featured with a clear explanation of the technology.
Abstract:- Non-traditional machining (NTM) processes are now being widely used to generate intricate and accurate shapes in materials, like titanium, stainless steel, high strength temperature resistant (HSTR) alloys, fiber-reinforced composites, ceramics, refractories and other difficult-to- machine alloys having higher strength, hardness, toughness and other diverse material properties. Generation of complex shapes in such materials by the traditional machining processes is experienced to be difficult. Selection of the most suitable nonconventional machining process (NCMP) for a given machining application can be viewed as multi-criteria decision making (MCDM) problem with many conflicting and diverse criteria. To aid these selection processes, different MCDM methods have been proposed. This paper introduces the use of an almost unexplored MCDM,OCRA and NCMP selection problems.
These materials have various applications in the manufacturing of product. These materials cannot be machined economically using conventional manufacturing process. In the competitive business environment customer expects high accurate product with low cost, cost and process optimization using conventional manufacturing methods is not suitable, this forces to use non tradition manufacturing methods. The unique characteristics of this processes is that there is no direct contact between tool and the workpiece and also in this process a huge amount of energy can be concentrated per unit area. Also the selection process becomes more important as all the machining processes cannot be done by using a single method we need to choose an efficient method for different machining processes. Also as we understand the importance and efficiency on non-traditional machining over traditional machining it gives us advantages over it and also this NTM processes leads to lot of advancement which has to be done day by day. This NTM process also gives us a path for various innovations as well as it makes us comfortable for designing of complex geometrical shapes. These situations leads to a great competition in the market. As there is difficulty in the selection of NTM process this selection is
Thermal or electrothermal energy : Thermal energy is utilized to melt and vaporize small areas of the work surface by concentrating the heat energy such as heat developed due to high voltage, amplified light or ionized material. Machining processes that utilizes thermal energy include: Electrical discharge machining (EDM), laser beam machining (LBM), electron beam machining (EBM), plasma arc machining (PAM),
The processes used for optimizing any NTM process includes the use of highly collimated, monochromatic and coherent light beam for melting and evaporation of the work material. The selection of NTM process involves the identification of the work material and the type of machining process to be carried out .More importance is given for the properties of the work material such as hardness, thermal resistance, chemical inertness, electrical conductivity, strength to weight ratio and life expectancy, All these properties are to be high for better machinability. Among the various process, USM has good capability and is versatile as both conductive and non-conductive, brittle, complicated in shape can be machined with great precision. There are two different categories in laser beam machining: laser micromachining and laser milling .In plasma arc machining high temperature plasma arc is generated to remove material in PAM process. ECDM involves material removal through electrochemical erosion and electro chemical dissolution. It utilizes electrical discharge in electrolytes for removal of material, which
The NTM process selection arises with the identification of the type of work piece material and the type of machining operation that has to be carried out. Many scholars are involved in research in the field of nontraditional machining processes, some of them have produced theories or systematic procedures for selection of nontraditional machining process:
Yurdakul and Cogun (2003) proposed a selection procedure for NTM processes based on a combination of analytic hierarch (AHP) and technique for order inclination which links the similarities to ideal solution (TOPSIS) methods. AHP method is used to determine the criteria for weights ,i.e. relative importance of the criteria, whereas TOPSIS method is used to rank each of the viable NTM process. Chajraborty and Dey (2006) presented a schematic methodology for selection of the best NTM process which are constrained of material and machining conditions.
Karande and Chakraborty (2012a ) integrated PROMETHEE (preference ranking organization method for enrichment evaluation) and GAIA (geometrical analysis for interactive aid) methods for NTM process selection for a specific machining application. Karande and Chakraborty (2012b ) applied reference point approach for choosing the most suitable NTM processes for generating cylindrical through holes on titanium and through cavities on ceramics. 2ff7e9595c
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