Contribution à l'étude de l'intégrité des surfaces fonctionnelles induites par un procédé thermomécanique-mécanique combiné PDF Download
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Author: Yasmine Charfeddine
Publisher:
ISBN:
Category :
Languages : fr
Pages : 203
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Book Description
Combining grinding with burnishing called “REGAL” is a newly developed outstanding technique consisting in grinding and burnishing operating simultaneously. The purpose behind this innovative approach is to enhance the surface integrity of the workpiece obtained by REGAL if compared to grinding and burnishing performing each one apart. REGAL process is made possible thanks to the design and manufacturing of a mechanical fixing system capable of maintaining the burnishing ball next to the grinding wheel. An automated control table is needed to make small and precise lateral feeds in order to ensure high surface recovery rates obtained by the ball burnishing tool. The most influential parameters of REGAL process were identified and their impacts on surface integrity were studied in terms of forces, roughness and residual stress results. The experimental results have shown that further from gaining time and energy by combining two processes in one, REGAL process enhances drastically the quality of the surface obtained if compared to workpiece surfaces obtained after grinding and burnishing acting separately. In addition, simultaneous grinding and burnishing introduces compressive residual stress results at the surface and beneath it reaching a deeper depth than the depth obtained by burnishing at the same manufacturing conditions thanks to the physicochemical changes obtained by the simultaneous thermomechanical/purely mechanical loads applied to the workpiece. 3D numerical simulations of grinding, burnishing and REGAL were also conducted to understand the physical phenomena occurring that is responsible of getting a more compressive residual stress layer obtained by REGAL if compared to burnishing acting separately and are in adequacy with the experimental results.
Author: Yasmine Charfeddine
Publisher:
ISBN:
Category :
Languages : fr
Pages : 203
Get Book Here
Book Description
Combining grinding with burnishing called “REGAL” is a newly developed outstanding technique consisting in grinding and burnishing operating simultaneously. The purpose behind this innovative approach is to enhance the surface integrity of the workpiece obtained by REGAL if compared to grinding and burnishing performing each one apart. REGAL process is made possible thanks to the design and manufacturing of a mechanical fixing system capable of maintaining the burnishing ball next to the grinding wheel. An automated control table is needed to make small and precise lateral feeds in order to ensure high surface recovery rates obtained by the ball burnishing tool. The most influential parameters of REGAL process were identified and their impacts on surface integrity were studied in terms of forces, roughness and residual stress results. The experimental results have shown that further from gaining time and energy by combining two processes in one, REGAL process enhances drastically the quality of the surface obtained if compared to workpiece surfaces obtained after grinding and burnishing acting separately. In addition, simultaneous grinding and burnishing introduces compressive residual stress results at the surface and beneath it reaching a deeper depth than the depth obtained by burnishing at the same manufacturing conditions thanks to the physicochemical changes obtained by the simultaneous thermomechanical/purely mechanical loads applied to the workpiece. 3D numerical simulations of grinding, burnishing and REGAL were also conducted to understand the physical phenomena occurring that is responsible of getting a more compressive residual stress layer obtained by REGAL if compared to burnishing acting separately and are in adequacy with the experimental results.
Author: Anis Rami
Publisher:
ISBN:
Category :
Languages : fr
Pages : 141
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Book Description
Le procédé de tournage galetage (CoTuB) est un traitement d'usinage innovant réalisant les procédés de tournage et de galetage à billes simultanément et sur la même machine-outil. L'objectif du procédé combiné est d'améliorer l'intégrité de surface et en même temps d'augmenter la productivité par rapport aux traitements conventionnels de surface et les procédés d'usinage. En adoptant un plan d'expérience, il a été démontré qu'une amélioration considérable de l'intégrité de surface pourrait être obtenue en utilisant le nouveau procédé combiné et en sélectionnant les paramètres appropriés. Pour effectuer une étude paramétrique, un ensembre d'expériences basées sur un plan d'expérience de type Taguchi complété par une analyse de la variance (ANOVA) a été réalisée. Le but de cette étude expérimentale est d'identifier les paramètres optimaux du tournage/galetage lors du traitement de l'acier 42 Cr Mo 4 permettant de donner une intégrité de surface optimale.Pour une meilleure compréhension des phénomènes impliqués lors du procédé combiné d'usinage/galetage, des approches et méthodologies numériques ont été développées afin de reproduire le procédé combiné. Une nouvelle approche numérique, appelée "Approche Mixte", est développée et utilisée afin de simplifier la simulation du procédé combiné. Cette approche combine des données expérimentales et numériques afin de déterminer la forme et de quantifier les chargements thermiques et mécaniques exercés par l'outil de coupe sur la surface usinée sur chaque zone de cisaillement. Cette nouvelle méthode a permis d'effectuer une simulation 3D du procédé de tournage-galetage combiné et permet de simuler plusieurs passages des outils autour de la surface usinée. La simulation permet de prédire les contraintes résiduelles induites par le procédé combiné et la comparaison révèle un bon accord entre les résultats numériques et expérimentaux.
Author: Leslie Rainer
Publisher: Getty Publications
ISBN: 1606060430
Category : Architecture
Languages : fr
Pages : 438
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Book Description
Earthen architecture constitutes one of the most diverse forms of cultural heritage and one of the most challenging to preserve. It dates from all periods and is found on all continents but is particularly prevalent in Africa, where it has been a building tradition for centuries. Sites range from ancestral cities in Mali to the palaces of Abomey in Benin, from monuments and mosques in Iran and Buddhist temples on the Silk Road to Spanish missions in California. This volume's sixty-four papers address such themes as earthen architecture in Mali, the conservation of living sites, local knowledge systems and intangible aspects, seismic and other natural forces, the conservation and management of archaeological sites, research advances, and training.
Author: Ioan D. Marinescu
Publisher: William Andrew
ISBN: 1437734677
Category : Technology & Engineering
Languages : en
Pages : 602
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Book Description
This book draws upon the science of tribology to understand, predict and improve abrasive machining processes. Pulling together information on how abrasives work, the authors, who are renowned experts in abrasive technology, demonstrate how tribology can be applied as a tool to improve abrasive machining processes. Each of the main elements of the abrasive machining system are looked at, and the tribological factors that control the efficiency and quality of the processes are described. Since grinding is by far the most commonly employed abrasive machining process, it is dealt with in particular detail. Solutions are posed to many of the most commonly experienced industrial problems, such as poor accuracy, poor surface quality, rapid wheel wear, vibrations, work-piece burn and high process costs. This practical approach makes this book an essential tool for practicing engineers. Uses the science of tribology to improve understanding and of abrasive machining processes in order to increase performance, productivity and surface quality of final products A comprehensive reference on how abrasives work, covering kinematics, heat transfer, thermal stresses, molecular dynamics, fluids and the tribology of lubricants Authoritative and ground-breaking in its first edition, the 2nd edition includes 30% new and updated material, including new topics such as CMP (Chemical Mechanical Polishing) and precision machining for micro-and nano-scale applications
Author: Robert I. King
Publisher: Springer Science & Business Media
ISBN: 146131965X
Category : Technology & Engineering
Languages : en
Pages : 370
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Book Description
The latest information indicates that the United States now spends in excess of $150 billion annually to perform its metal removal tasks using conventional machining technology. That estimate is increased from $115 billion 5 years ago. It becomes clear that metal removal technology is a very important candidate for rigorous investigation looking toward improvement of productivity within the manufacturing system. To aid in that endeavor, an extensive program of research has developed within the industrial community with the express purpose of establishing a new scientific and applied base that will provide principles upon which new manufacturing decisions can be made. One of the metal removal techniques that has the potential for great economic advantages is high-rate metal removal with related technologies. This text is concerned with the field of grinding as a subset of the general field of high-rate metal removal. Related processes (not covered in this text) include such topics as turning, drilling, and milling. In the final evaluation, the correct decision in the determination of a grinding process must necessarily include an understanding of the other methods of metal removal. The term grinding, as used herein, includes polishing, buffing, lapping, and honing as well as conventional definition: "... removing either metallic or other materials by the use of a solid grinding wheel".
Author: Sanjay Mazumdar
Publisher: CRC Press
ISBN: 1420041983
Category : Technology & Engineering
Languages : en
Pages : 417
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Book Description
More and more companies manufacture reinforced composite products. To meet the market need, researchers and industries are developing manufacturing methods without a reference that thoroughly covers the manufacturing guidelines. Composites Manufacturing: Materials, Product, and Process Engineering fills this void. The author presents a fundamental
Author: Food and Agriculture Organization of the United Nations
Publisher: Food & Agriculture Org.
ISBN: 9789251045411
Category : Business & Economics
Languages : en
Pages : 20
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Book Description
The actual Code of conduct is also available (1996) (ISBN 9251038341).
Author: Alan D. Lopez
Publisher: World Bank Publications
ISBN: 0821362631
Category : Medical
Languages : en
Pages : 511
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Book Description
Strategic health planning, the cornerstone of initiatives designed to achieve health improvement goals around the world, requires an understanding of the comparative burden of diseases and injuries, their corresponding risk factors and the likely effects of invervention options. The Global Burden of Disease framework, originally published in 1990, has been widely adopted as the preferred method for health accounting and has become the standard to guide the setting of health research priorities. This publication sets out an updated assessment of the situation, with an analysis of trends observed since 1990 and a chapter on the sensitivity of GBD estimates to various sources of uncertainty in methods and data.
Author: International Atomic Energy Agency
Publisher: International Atomic Energy Agency
ISBN: 9789201063205
Category : Technology & Engineering
Languages : en
Pages : 72
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Book Description
This publication results from a technical meeting on phenomenology and technologies relevant to in-vessel melt retention (IVMR) and ex-vessel corium cooling (EVCC). The purpose of the publication is to capture the state of knowledge, at the time of that meeting, related to phenomenology and technologies as well as the challenges and pending issues relevant to IVMR and EVCC for water cooled reactors by summarizing the information provided by the meeting participants in a form useful to practitioners in Member States.
Author: Janine M. Benyus
Publisher: Harper Collins
ISBN: 0061958921
Category : Science
Languages : en
Pages : 324
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Book Description
Repackaged with a new afterword, this "valuable and entertaining" (New York Times Book Review) book explores how scientists are adapting nature's best ideas to solve tough 21st century problems. Biomimicry is rapidly transforming life on earth. Biomimics study nature's most successful ideas over the past 3.5 million years, and adapt them for human use. The results are revolutionizing how materials are invented and how we compute, heal ourselves, repair the environment, and feed the world. Janine Benyus takes readers into the lab and in the field with maverick thinkers as they: discover miracle drugs by watching what chimps eat when they're sick; learn how to create by watching spiders weave fibers; harness energy by examining how a leaf converts sunlight into fuel in trillionths of a second; and many more examples. Composed of stories of vision and invention, personalities and pipe dreams, Biomimicry is must reading for anyone interested in the shape of our future.
