Xem 1-20 trên 98 kết quả Metal forming
  • Metal forming to make large parts, take large reductions, use high strength materials, work to net shape (precision flashless closed die forging), and use cold forming to obtain certain physical properties all require high forming forces. These forces may be larger than the capacity of existing machinery.

     

     

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  • Different aspects of metal forming, consisting of process, tools and design, are presented in this book. The chapters of this book include the state of art and analysis of the processes considering the materials characteristics. The processes of hydroforming, forging and forming of sandwich sheet are discussed. Also, a chapter on topography of tools, and another chapter on machine tools are presented. Design of a programmable metal forming press and methods for predicting forming limits of sheet metal are described....

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  • Metal-forming processes use a remarkable property of metals—their ability to flow plastically in the solid state without concurrent deterioration of properties. Moreover, by simply moving the metal to the desired shape, there is little or no waste.

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  • • This chapter aims to provide additional information on several techniques of metal forming processes other than those conventional process already mentioned in previous chapters. • The requirements for the process selection will be added, which are based on advantages and disadvantages of each type of non-conventional metal forming processes.

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  • Clear, practical and comprehensive, this mechanical estimating manual provides an indispensable resource for contractors, estimators, owners and anyone involved with estimating mechanical costs on construction projects, including a wealth of labor and price data, formulas, charts and graphs. Covering time-proven methodologies and procedures, it offers the user a full range of ready-to-use forms, detailed estimating guidelines, and numerous completed examples.

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  • Methods of sheet metal processes such as stretching, shearing, blanking, bending, deep drawing, redrawing are introduced. • Variables in sheet forming process will be discussed together with formability and test methods. • Defects occurring during the forming process will be emphasised. The solutions to such defect problems will also be given.

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  • Permanganate may be applied to sites as either potassium permanganate (KMnO4) or sodium permanganate (NaMnO4). Where cost dominates over engineering factors at a site, potassium permanganate is the preferred chemical form because it is more widely available, less costly, and is available in solid form, which facilitates transport and handling. Where other factors are more important, the liquid form of sodium permangante is preferable.

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  • “Cyanide” is a chemical with a long and fascinating history of respectful and productive use by mankind. The fundamental cyanide species, the cyanide ion CN−, is a highly versatile and strong binder of metals in aqueous solution, a property that has been exploited in ingenious ways for commercial processes that have benefited society. The best known and largest volume uses of cyanide are in the gold mining and electroplating industries.

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  • This chapter provides classification of metal forming processes based on types of forces applied onto metals. • Mechanics of metal forming will be outlined to understand stress criterion for plastic deformation. • Differences between hot and cold working will be highlighted and advantages-disadvantages of hot and cold working will be given. • Effects of deformation speed and friction on metal working process will be included.

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  • According to American Society for Testing and Materials' corrosion glossary, corrosion is defined as "the chemical or electrochemical reaction between a material, usually a metal, and its environment that produces a deterioration of the material and its properties".1 Other definitions include Fontana's description that corrosion is the extractive metallurgy in reverse,2 which is expected since metals thermodynamically are less stable in their elemental forms than in their compound forms as ores.

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  • Library of Congress Cataloging-in-Publication Data Mechanical estimating manual : sheet metal, piping, and plumbing/by Wendes Systems, Inc.; edited by Joseph D’Amelio. p. cm. Includes index. ISBN 0-88173-538-8 (print) -- ISBN 0-88173-539-6 (electronic) 1. Buildings--Mechanical equipment--Installation--Estimates--Handbooks, manuals, etc. I. D’Amelio, Joseph . II. Wendes Systems, Inc. TH6010.M457 2006 696--dc22 2006041262 Mechanical estimating manual : sheet metal, piping, and plumbing/by Wendes Systems, Inc.; edited by Joseph D’Amelio ©2007 by The Fairmont Press, Inc.

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  • CHAPTER 3 4 METAL FORMING, SHAPING, AND CASTING Magd E. Zohdi Dennis B. Webster Industrial Engineering Department Louisiana State University Baton Rouge, Louisiana William E. Biles Industrial Engineering Department University of Louisville Louisville, Kentucky 34.1 34.2 INTRODUCTION 1 0 1 1 HOT- WORKING PROCESSES 1102 34.2.1 Classification of Hot- Working Processes 1103 34.5 34.2.2 Rolling 1103 34.2.3 Forging 1105 34.2.4 Extrusion 1107 34.2.5 Drawing 1107 34.2.6 Spinning 1110 34.2.7 Pipe Welding 1111 34.2.8 Piercing 1111 COLD- WORKING PROCESSES 1112 34.3.

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  • The aim of the study was to investigate the crystallization kinetics and solidification behaviour of Fe60Co8Mo5Zr10W2B15 bulk glass forming alloy. The solidification behaviour in near-equilibrium and non-equilibrium cooling conditions was studied. The eutectic and peritectic reactions were found to exist in the solidification sequence of the alloy. The bulk metallic glass formation was achieved by using two methods: quenching from the liquid state and quenching from the semi-state.

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  • Phase diagrams, thermodynamic data in graphical form, are one of the basic tools of the metallurgist, materials scientist, and materials engineer. They can be used for alloy design, selection of hot-working and fabricating parameters, prediction of performance, guidance in selection of hot-working and fabricating parameters, prediction of performance, guidance in selection of heat-treating process parameters, solving performance problems, including failure analysis, and for many other purposes.

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  • Introduction Lead is a rare element present in the earth’s crust in a 1.4 Â 10À3% (w/w). It is a toxic heavy metal that exists only in a cubic close-packed metallic form. It shows the preference for the divalent state with electronic configuration [Xe]4f145d106s2 and low stability of the Pb–Pb covalent bond. Lead(IV) in solution is unstable (electronic configuration: [Xe]4f145d10). The most important Pb ore is galena (PbS). Other lead ores are anglesite (PbSO4), cerussite (PbCO3), mimetesite (Pb5(AsO4)3Cl), and pyromorphite (Pb5(PO4)3Cl). ...

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  • Science seeks to understand and explain our world, be that its physical composition (geology), chemical composition (chemistry), the way its composite matter interacts (physics), or the organisms that inhabit it (biology). We can only get an idea of what life is all about by piecing together information from each discipline to give us the big picture. We don’t have to look very far to realize that it is difficult, if not impossible, to separate biology from chemistry. After all, our body is a bag of chemicals.

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  • Fmt published 1949 Second edition 1955 Third edition 1962 Fourth edition 1967 F f h edition 1976 it Reprinted 1978 Sixth edition 1983 Seventh edition 1992 Paperback edition (with corrections) 1998, 1999 Q Reed Educational and Pmfessiond Publishing Ltd 1992 All rights reserved. No part of this publication may be reproduced in any material form (including photocopying or storing in any medium by electronic means and whether or not transiently

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  • From high-performance, economical and environmental points of view, Powder metallurgy process shows remarkable advantages in production of parts and components due to their special compositions by elemental mixing and 3-dimensional near net shape forming methods. Powder metallurgy process can be applied to not only metal materials but also ceramics and organic materials, which both are employed as structural and electrical products.

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  • Expert systems represent a branch of artificial intelligence aiming to take the experience of human specialists and transfer it to a computer system. The knowledge is stored in the computer, which by an execution system (inference engine) is reasoning and derives specific conclusions for the problem. The purpose of expert systems is to help and support user’s reasoning but not by replacing human judgement. In fact, expert systems offer to the inexperienced user a solution when human experts are not available....

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  • Article 87 of the Constitution of the Republic of Poland mentions – among the universally binding legislation – also ratifi ed international conventions/agreements. It means that these con- ventions/agreements form a part of the domestic legal order and have precedence over national laws in the event of potential collision with these laws, if they have been ratifi ed upon prior consent granted by the Act of Parliament (Article 91 of the Constitution of the Republic of Poland).

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