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Author: Mujahid Mohiuddin Mohammed
Publisher:
ISBN: 9780355628562
Category : Mechanical engineering
Languages : en
Pages : 61
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Book Description
Ceramics are brittle material and possess lower toughness when compared to metals. This brittle nature results in the formation of cracks and cutting tool fracture when tried to machine conventionally. Thus, diamond grinding was the only method of processing ceramics until the development of Laser Assisted Machining (LAM). In LAM, a laser is used to rise the temperature of the surface of the component which is later machined conventionally. LAM yields in higher material removal rate and superior surface finish while reducing the total machining cost. At elevated temperatures ceramics act as a ductile material thereby enabling plastic deformation and generation of continuous chip. Temperatures attained during LAM has a huge impact on the end results, i.e. low temperatures lead to the formation of cracks whereas extremely high temperatures cause a change of microstructure. Thus, a study of thermal history is of utmost importance in LAM and performing such study through Finite Element Method (FEM) would help in predicting the temperature distribution in the sample. The temperature distribution is highly affected by the laser power, laser spot size, the rotation speed of the workpiece, translational velocity, and pre-heat time. Extensive research has been performed on LAM of solid cylinder both experimentally and theoretically but there hasn't been any research on LAM of hollow cylinders. A study of temperature histories for a hollow cylinder will be performed in this research to analyze its variation of temperature along the depth and distribution of temperature with varying depth. The employed procedure will be verified with the available data in the literature, either for solid or hollow cylinders.
Author: Mujahid Mohiuddin Mohammed
Publisher:
ISBN: 9780355628562
Category : Mechanical engineering
Languages : en
Pages : 61
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Book Description
Ceramics are brittle material and possess lower toughness when compared to metals. This brittle nature results in the formation of cracks and cutting tool fracture when tried to machine conventionally. Thus, diamond grinding was the only method of processing ceramics until the development of Laser Assisted Machining (LAM). In LAM, a laser is used to rise the temperature of the surface of the component which is later machined conventionally. LAM yields in higher material removal rate and superior surface finish while reducing the total machining cost. At elevated temperatures ceramics act as a ductile material thereby enabling plastic deformation and generation of continuous chip. Temperatures attained during LAM has a huge impact on the end results, i.e. low temperatures lead to the formation of cracks whereas extremely high temperatures cause a change of microstructure. Thus, a study of thermal history is of utmost importance in LAM and performing such study through Finite Element Method (FEM) would help in predicting the temperature distribution in the sample. The temperature distribution is highly affected by the laser power, laser spot size, the rotation speed of the workpiece, translational velocity, and pre-heat time. Extensive research has been performed on LAM of solid cylinder both experimentally and theoretically but there hasn't been any research on LAM of hollow cylinders. A study of temperature histories for a hollow cylinder will be performed in this research to analyze its variation of temperature along the depth and distribution of temperature with varying depth. The employed procedure will be verified with the available data in the literature, either for solid or hollow cylinders.
Author: Mohammed Mudassar Hussain Ansari
Publisher:
ISBN: 9780438855199
Category : Mechanical engineering
Languages : en
Pages : 57
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Book Description
The most commonly used technique for machining ceramics is diamond grinding. It accounts for up to 75% of the manufacturing costs resulting in high cost of the product. An LED bulb offering increased brightness, energy saving and long life by using ceramic integration to LED chips costs around 10 times to a normal LED bulb. Complex geometries used in electronics, medical surgeries, aerospace, and automobile industries require the use of costly molds or powder metallurgy for low batch production which does not justify the cost. Laser Assisted Machining (LAM) is a process that uses a laser to locally heat the surface of a component (made of ceramic), making it more ductile and machinable using conventional machine tools. Recent studies have shown that LAM gives improved material removal rate and surface finishing, and reduces the cost of machining, i.e. around 50% reduction in the manufacturing costs. Physical experiments require the use of advanced instruments and specialized tools making it a difficult and time-consuming process. It is necessary to have a predicting thermal study to help design more efficient physical experiments. In this study, Finite Element Analysis (FEA) has been used to analyze the thermal distribution of a workpiece under rotating and translating moving heat source. In LAM, there are many variables that greatly affect the temperature, such as laser size, laser power, translational velocity, etc. Extensive research has been performed on solid cylinders however many new applications such as thermocouple protection tube, cylinder lining, blasting nozzles, bone fusion in surgeries, etc., require application of hollow cylinders. Therefore, this work intends to perform a thermal study on a ceramic tube when a laser beam moving on its outer surface. As the generated heat due to the machining is insignificant compared to the heat created by the laser heat source, this study doesn't consider the mechanical removal of the material. The ceramic chosen for this study is Silicon Nitride as it is widely used due to its excellent wide range of properties making it suitable for all industries. The FEA method and assumptions that will be used on this research has been verified with previous experimental and numerical research on a solid cylinder.
Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 1036
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Book Description
Author: Lu Zheng
Publisher: John Wiley & Sons
ISBN: 1119506352
Category : Science
Languages : en
Pages : 210
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Book Description
The first book to comprehensively address the theory, kinematic modelling, numerical simulation and applications of vibration assisted machining Vibration Assisted Machining: Theory, Modelling and Applications covers all key aspects of vibration assisted machining, including cutting kinematics and dynamics, the effect of workpiece materials and wear of cutting tools. It also addresses practical applications for these techniques. Case studies provide detailed guidance on the design, modeling and testing of VAM systems. Experimental machining methods are also included, alongside considerations of state-of-the-art research developments on cutting force modeling and surface texture generation. Advances in computational modelling, surface metrology and manufacturing science over the past few decades have led to tremendous benefits for industry. This is the first comprehensive book dedicated to design, modelling, simulation and integration of vibration assisted machining system and processes, enabling wider industrial application of the technology. This book enables engineering students and professionals in manufacturing to understand and implement the latest vibration assisted machining techniques. Highlights include: Comprehensive coverage of the theory, kinematics modelling, numerical simulation and applications of vibration assisted machining (VAM) Case studies with detailed guidance on design, modelling and testing of VAM systems, as well as experimental machining methods Discussion of state-of-the-art research developments on cutting force modelling and surface texture generation Coverage of the history of VAM, its current applications and future directions for the technology Vibration Assisted Machining: Theory, Modelling and Applications provides engineering students, researchers, manufacturing engineers, production supervisors, tooling engineers, planning and application engineers and machine tool designers with the fundamentals of vibration assisted machining, along with methodologies for developing and implementing the technology to solve practical industry problems.
Author: Lauralice de Campos Franceschini Canale
Publisher: ASM International
ISBN: 1615030980
Category : Technology & Engineering
Languages : en
Pages : 651
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Book Description
Author: C. Suryanarayana
Publisher: CRC Press
ISBN: 1498763685
Category : Technology & Engineering
Languages : en
Pages : 543
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Book Description
Reflecting the fast pace of research in the field, the Second Edition of Bulk Metallic Glasses has been thoroughly updated and remains essential reading on the subject. It incorporates major advances in glass forming ability, corrosion behavior, and mechanical properties. Several of the newly proposed criteria to predict the glass-forming ability of alloys have been discussed. All other areas covered in this book have been updated, with special emphasis on topics where significant advances have occurred. These include processing of hierarchical surface structures and synthesis of nanophase composites using the chemical behavior of bulk metallic glasses and the development of novel bulk metallic glasses with high-strength and high-ductility and superelastic behavior. New topics such as high-entropy bulk metallic glasses, nanoporous alloys, novel nanocrystalline alloys, and soft magnetic glassy alloys with high saturation magnetization have also been discussed. Novel applications, such as metallic glassy screw bolts, surface coatings, hyperthermia glasses, ultra-thin mirrors and pressure sensors, mobile phone casing, and degradable biomedical materials, are described. Authored by the world’s foremost experts on bulk metallic glasses, this new edition endures as an indispensable reference and continues to be a one-stop resource on all aspects of bulk metallic glasses.
Author: P.R.N. Childs
Publisher: Butterworth-Heinemann
ISBN: 0080524028
Category : Technology & Engineering
Languages : en
Pages : 420
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Book Description
Metal machining is the most widespread metal-shaping process in the mechanical manufacturing industry. World-wide investment in metal machining tools increases year on year - and the wealth of nations can be judged by it. This text - the most up-to-date in the field - provides in-depth discussion of the theory and application of metal machining at an advanced level. It begins with an overview of the development of metal machining and its role in the current industrial environment and continues with a discussion of the theory and practice of machining. The underlying mechanics are analysed in detail and there are extensive chapters examining applications through a discussion of simulation and process control. "Metal Machining: Theory and Applications" is essential reading for senior undergraduates and postgraduates specialising in cutting technology. It is also an invaluable reference tool for professional engineers. Professors Childs, Maekawa, Obikawa and Yamane are four of the leading authorities on metal machining and have worked together for many years.Of interest to all mechanical, manufacturing and materials engineersTheoretical and practical problems addressed
Author:
Publisher:
ISBN:
Category : Metallurgy
Languages : en
Pages : 1634
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Book Description
Author: Nilesh Kulkarni
Publisher: Butterworth-Heinemann
ISBN: 012800732X
Category : Technology & Engineering
Languages : en
Pages : 59
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Book Description
This book describes the fundamentals of residual stresses in friction stir welding and reviews the data reported for various materials. Residual stresses produced during manufacturing processes lead to distortion of structures. It is critical to understand and mitigate residual stresses. From the onset of friction stir welding, claims have been made about the lower magnitude of residual stresses. The lower residual stresses are partly due to lower peak temperature and shorter time at temperature during friction stir welding. A review of residual stresses that result from the friction stir process and strategies to mitigate it have been presented. Friction stir welding can be combined with additional in-situ and ex-situ manufacturing steps to lower the final residual stresses. Modeling of residual stresses highlights the relationship between clamping constraint and development of distortion. For many applications, management of residual stresses can be critical for qualification of component/structure. - Reviews magnitude of residual stresses in various metals and alloys - Discusses mitigation strategies for residual stresses during friction stir welding - Covers fundamental origin of residual stresses and distortion
Author:
Publisher:
ISBN:
Category : Metallurgy
Languages : en
Pages : 1650
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Book Description
