Real-time Laser Materials Processing Control PDF Download
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Author: N. Rajendran
Publisher:
ISBN:
Category : Lasers in engineering
Languages : en
Pages : 22
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Book Description
Author: N. Rajendran
Publisher:
ISBN:
Category : Lasers in engineering
Languages : en
Pages : 22
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Book Description
Author: Jonathan R. Lawrence
Publisher: Woodhead Publishing
ISBN: 0081012535
Category : Technology & Engineering
Languages : en
Pages : 802
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Book Description
Advances in Laser Materials Processing: Technology, Research and Application, Second Edition, provides a revised, updated and expanded overview of the area, covering fundamental theory, technology and methods, traditional and emerging applications and potential future directions. The book begins with an overview of the technology and challenges to applying the technology in manufacturing. Parts Two thru Seven focus on essential techniques and process, including cutting, welding, annealing, hardening and peening, surface treatments, coating and materials deposition. The final part of the book considers the mathematical modeling and control of laser processes. Throughout, chapters review the scientific theory underpinning applications, offer full appraisals of the processes described and review potential future trends. - A comprehensive practitioner guide and reference work explaining state-of-the-art laser processing technologies in manufacturing and other disciplines - Explores challenges, potential, and future directions through the continuous development of new, application-specific lasers in materials processing - Provides revised, expanded and updated coverage
Author: William M. Steen
Publisher: Springer Science & Business Media
ISBN: 1447137523
Category : Technology & Engineering
Languages : en
Pages : 416
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Book Description
New chapters on bending and cleaning reflect the changes in the field since the last edition, completing the range of practical knowledge about the processes possible with lasers already familiar to users of this well-known text. Professor Steen's lively presentation is supported by a number of original cartoons by Patrick Wright and Noel Ford, which will bring a smile to your face and ease the learning process. From the reviews: "...well organized, and the text is very practical...The engineering community will find this book informative and useful." (OPTICS AND PHOTONICS NEWS, July/August 2005)
Author: Mohammad Hossein Farshidianfar
Publisher:
ISBN:
Category : Laser materials
Languages : en
Pages : 190
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Book Description
Laser Materials Processing (LMP) is currently one of the fastest growing technologies of the 21st century. Different categories of this technology such as Laser Additive Manufacturing (LAM) and Laser Heat Treatment (LHT) have now paved the way for more versatile methods of manufacturing that were not possible through conventional manufacturing methods. The localized laser heat source provides advantages such as minimal dilution, minimal distortion, small heat affected zones, and improved localized geometry and quality. However, these advantages come at a price, which is the number of inputs, outputs and process parameters involved that make the LMP a complex process for mainstream manufacturing. Current industrial LMP platforms require an extensive amount of manual tuning and process knowledge in order to achieve high quality production. Nonetheless, because of process sensitivity and lack of automation in LMP machines, the material and mechanical properties of LMP-manufactured products are highly inconsistent. Therefore, to take advantage of the technology's benefits and to establish LMP into the mainstream manufacturing technology, it is highly essential to develop a fully automated closed-loop LMP process that can intelligently control important output characteristics in real-time. In this research, an automated real-time closed-loop process will be studied and developed to simultaneously control two of the most important LMP output properties: (1) microstructure and (2) geometry. A multi-objective thermal-geometry monitoring and control module is developed to enable closed-loop control of microstructure and geometry properties of the LMP process. Geometry features such as clad height of the LAM process are directly monitored through a CCD camera. Geometry control is achieved by direct control of absolute geometrical values in real-time. An infrared thermal image acquisition system is integrated with the CCD-based imaging system to monitor real-time thermal dynamics. Thermal dynamics of the process such as the cooling rate, melt pool temperature, and heating rate are recorded directly in real-time through a specific set of thermal image analyses algorithms. Microstructure control is defined as control of consistency and stability of a desired set of microstructures for specific materials correlated with a set of perceived thermal dynamics and thermal signatures offline. Therefore, by directly controlling the desired set of correlated thermal dynamics in real-time, a consistent controlled microstructure is guaranteed during the process. A complete closed-loop control process is developed by integrating the monitoring system, LMP system and a multi-input-multi-output controller system. LHT and LAM experiments are conducted with thermal monitoring to understand and predict microstructue, hardness and geometry characteristics in real-time. Microstructure features such as martensitic formation and phase transformations are correlated with real-time thermal cooling/heating rates and melt pool temperatures to develop a microstructure prediction method. Important geometry properties such as hardened depth are also correlated with the thermal dynamics to identify a suitable feedback signal for closed-loop control of the depth, which cannot be monitored by a CCD camera. Thermal patterns are identified for online control of the hardness during single-track and multi-track LHT and LAM processes. Furthermore, an accurate and computationally efficient thermal dynamics model is developed and validated for the LHT and LAM processes for real-time estimation of the thermal dynamics of the process with limited information of the thermal boundaries. The dynamic model is integrated into a state observer feedback control system to provide model-based closed-loop control of the thermal dynamics. The intelligent closed-loop process is evaluated for different case studies of single-track and multi-track laser heat treatment and laser additive manufacturing. The real-time control of microstructure and hardness is achieved in the LHT process through a closed-loop control of the peak temperature. State observer feedback control of the peak temperature is also evaluated for the LHT process. Single-input-single-output control of the clad height and cooling rate are also incorporated for individual real-time control of the microstructure and geometry. Finally, an integrated microstructure and geometry control of the LAM process is constructed and tested for single-track and multi-track LAM depositions, to provide consistent material properties with controlled clad height. As a result of the closed-loop multi-input-multi-output control, the consistency and quality of the LMP manufacturing processes have increased significantly. The controller is capable of eliminating the effect of process and environmental disturbances such as irregular workpiece geometries or undesired heat accumulations. As a result, the developed closed-loop system significantly reduces the extensive amount of time and effort required for manual tuning of LMP setups, and automatically adjusts the process inputs to achieve the desired material and geometry properties. In addition, it also provides an essential tool for obtaining in-process knowledge of the LMP manufacturing process.
Author: William Steen
Publisher: Springer Science & Business Media
ISBN: 1447136098
Category : Technology & Engineering
Languages : en
Pages : 358
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Book Description
Laser Material Processing (2nd ed) by William M Steen is an updated and expanded version of the original which sold very well with reprints in 1994 and 1996. This new edition includes a whole extra chapter - Rapid Prototyping and Low Volume Manufacture - and updates other sections such as those dealing with types of industrial lasers and new applications, and recent developments in Surface Treatment and In-Process Sensing. It comprises some addtional 60-80 pages whilst retaining the value of the original edition. It provides the reader with an understanding of laser process mechanisms, methods of application, automation and In-Process Sensing and industrial potential. The use of Patrick Wright's humorous cartoons and the many diagrams and tables to illustrate points make it a very useful and lively reference guide for students at all stages. Since laser technology is a rapidly changing field this new updated and expanded version will be particularly topical.
Author: Peter Schaaf
Publisher: Springer Science & Business Media
ISBN: 3642132812
Category : Science
Languages : en
Pages : 241
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Book Description
Laser materials processing has made tremendous progress and is now at the forefront of industrial and medical applications. The book describes recent advances in smart and nanoscaled materials going well beyond the traditional cutting and welding applications. As no analytical methods are described the examples are really going into the details of what nowadways is possible by employing lasers for sophisticated materials processing giving rise to achievements not possible by conventional materials processing.
Author: Laser Institute
Publisher: CRC Press
ISBN: 9780912035628
Category : Technology & Engineering
Languages : en
Pages : 1092
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Book Description
Author: Elijah Kannatey-Asibu, Jr.
Publisher: John Wiley & Sons
ISBN: 1119881609
Category : Technology & Engineering
Languages : en
Pages : 613
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Book Description
Principles of Laser Materials Processing Authoritative resource providing state-of-the-art coverage in the field of laser materials processing, supported with supplementary learning materials Principles of Laser Materials Processing goes over the most recent advancements and applications in laser materials processing, with the second edition providing a welcome update to the successful first edition through updated content on the important fields within laser materials processing. The text includes solved example problems and problem sets suitable for the readers’ further understanding of the technology explained. Split into three parts, the text first introduces basic concepts of lasers, including the characteristics of lasers and the design of their components, to aid readers in their initial understanding of the technology. The text then reviews the engineering concepts that are needed to analyze the different processes. Finally, it delves into the background of laser materials and provides a state-of-the-art compilation of material in the major application areas, such as laser cutting and drilling, welding, surface modification, and forming, among many others. It also presents information on laser safety to prepare the reader for working in the industry sector and provide practicing engineers the updates needed to work safely and effectively. In Principles of Laser Materials Processing, readers can expect to find specific information on: Laser generation principles, including basic atomic structure, atomic transitions, population distribution, absorption, and spontaneous emission Optical resonators, including standing waves in a rectangular cavity, planar resonators, beam modes, line selection, confocal resonators, and concentric resonators Laser pumping, including optical pumping, arc/flash lamp pumping, energy distribution in the active medium, and electrical pumping Broadening mechanisms, including line-shape functions, homogeneous broadening such as natural and collision, and inhomogeneous broadening Principles of Laser Materials Processing is highly suitable for senior undergraduate and graduate students studying laser processing, and non-traditional manufacturing processes; it is also aimed at researchers to provide additional information to be used in research projects that are to be undertaken within the technology field.
Author: Mahlen David Thomas Fox
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Elijah Kannatey-Asibu, Jr.
Publisher: John Wiley & Sons
ISBN: 1119881625
Category : Technology & Engineering
Languages : en
Pages : 613
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Book Description
Principles of Laser Materials Processing Authoritative resource providing state-of-the-art coverage in the field of laser materials processing, supported with supplementary learning materials Principles of Laser Materials Processing goes over the most recent advancements and applications in laser materials processing, with the second edition providing a welcome update to the successful first edition through updated content on the important fields within laser materials processing. The text includes solved example problems and problem sets suitable for the readers’ further understanding of the technology explained. Split into three parts, the text first introduces basic concepts of lasers, including the characteristics of lasers and the design of their components, to aid readers in their initial understanding of the technology. The text then reviews the engineering concepts that are needed to analyze the different processes. Finally, it delves into the background of laser materials and provides a state-of-the-art compilation of material in the major application areas, such as laser cutting and drilling, welding, surface modification, and forming, among many others. It also presents information on laser safety to prepare the reader for working in the industry sector and provide practicing engineers the updates needed to work safely and effectively. In Principles of Laser Materials Processing, readers can expect to find specific information on: Laser generation principles, including basic atomic structure, atomic transitions, population distribution, absorption, and spontaneous emission Optical resonators, including standing waves in a rectangular cavity, planar resonators, beam modes, line selection, confocal resonators, and concentric resonators Laser pumping, including optical pumping, arc/flash lamp pumping, energy distribution in the active medium, and electrical pumping Broadening mechanisms, including line-shape functions, homogeneous broadening such as natural and collision, and inhomogeneous broadening Principles of Laser Materials Processing is highly suitable for senior undergraduate and graduate students studying laser processing, and non-traditional manufacturing processes; it is also aimed at researchers to provide additional information to be used in research projects that are to be undertaken within the technology field.
