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Search Results: 1 - 10 of 5475 matches for " Sheet metal "
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New Methods Testing of Adhesion of the Coating to Sheet Metal by Bending  [PDF]
Milan Dvo?ák, Emil Schwarzer
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2012, DOI: 10.4236/jsemat.2012.22011
Abstract: The article is deals for new experimental equipment for effective test adhesion for selected coating STEEL, applied cold on the coated metal sheet with Al (aluminum). Explanation to the word STEEL: STEEL coating has significant anti- corrosive properties and he is resistant for main oxidizing agents such as acids, alkalis, salt vapors etc. Resists tem- peratures to 600?C and create an elastic film that is resistant to abrasion, as soon as it was to complete po-lymerization. It is very simple to applied to metallic and nonmetallic surfaces. Dries quickly and is dry to the touch after 90 to 120 seconds. STEEL is the best possible solution anywhere, if needs arises powerful local protection against atmospheric and corrosive agents or to elevated temperatures. STEEL is also useful as a method for protect of welds on stainless steels instead of traditional staining procedures. Broad application is in automotive industry to modify the surfaces of block vehicle, car-body repairs, welds needing protection, in heating industry for example boilers, in air condition with heat exchanger and in shipping industry. [1-3].In experiments with a new test equipment is showed that for bending radius of interval from range R11 to R35 there is a change deposited coating STEEL from original coating Al and this coating was part of test metal sheet of thickness 1.5 mm. In the next stage of solution was developed technological process, which allowed increase of adhesion coating STEEL for bending up to or maximum 180? (shape U). Result of new technology is documented in article. Experiments was implementing with cooperation of the Masaryk University in Brno.
Heat Transport Study of the Laminar Heat Pipe Heat Exchanger  [PDF]
Wei-Keng Lin, Ke Chine Liaw, Min-Zen Tsai, Min-Gung Chu
Smart Grid and Renewable Energy (SGRE) , 2012, DOI: 10.4236/sgre.2012.34046
Abstract: The purpose of this experiment is to analyze the performance of the Laminar Heat Pipe Heat Exchanger. The test samples were divided two groups, one is the metal corrugated sheet with heat pipe, and the other is the metal corrugated sheet only. By dipping these two group samples into hot water and to see the thermal image by Infrared thermal imager. The results shown the temperature risen of the sheet with heat pipe was faster than that of the sheet without heat pipe. In addition, the bigger of the temperature difference between hot water temperature and ambient temperature, the quicker of the temperature risen for the metal corrugated sheet, and the temperature of the metal corrugated sheet were homogenous as well. For example, when the water temperature is 30℃, ambient temperature is 20℃, the metal corrugated sheet with heat pipe rise rapidly to 26℃ within 1 minute, while the metal corrugated sheet without heat pipe rise to 22℃ only, this temperature difference would be more obvious with the increasing of the hot water temperature. When the hot water temperature is up to 40℃, the metal corrugated sheet with heat pipe rise rapidly to 31℃ within 1 minute, while the metal corrugated sheet without het pipe is still rise up to 22℃ only. When the hot water temperature is up to 50℃, The metal corrugated sheet with heat pipe rise rapidly to 33℃ within 1 minute, while the sheet without heat pipe still keep at 22℃, the results shown the heat pipe affect the temperature rising speed is obvious, and it also implying heat pipe is a very important parameter for the heat transfer rate of the Laminar Heat Pipe Heat Exchanger.
Parametric Study of Dynamic Wrinkling in a Thin Sheet on Elastic Foundation  [PDF]
M. N. Hamdan, A. A. Al-Qaisia, S. Abdallah
International Journal of Modern Nonlinear Theory and Application (IJMNTA) , 2012, DOI: 10.4236/ijmnta.2012.13008
Abstract: This work presents an approximate analytical study of the problem of dynamic wrinkling of a thin metal sheet under a specified time varying tension. The problem is investigated in the framework of the dynamic stability of a nonlinear plate model on elastic foundation which namely takes into account the nonlinear mechanics of mid-plane stretching and the dependence of the membrane force on this mechanics. The plate is assumed to be a wide rectangular slab, hinged at two opposite ends and free at the long ends, which can be deformed in a cylindrical shape so that the governing in-plane bending equation of motion takes the same form as that of a beam (e.g. lateral strip) element. An approximate analytical analysis of the beam wrinkling behavior under sinusoidal parametric excitation is carried out by using the assumed single mode wrinkling motion to reduce the beam field nonlinear partial differential equation to that of a single degree of freedom non-linear oscillator. A first order stability analysis of an approximate analytical solution obtained using the Multi-Time-Scales (MMS) method is used to derive a criterion defining critical driving frequency in terms of system parameters for the initiation of wrinkling motion in the thin metal sheet. Results obtained using this criterion is presented for selected values of system parameters.
Theoretical and Experimental Analysis of Deep Drawing Cylindrical Cup  [PDF]
Najmeddin Arab, Abotaleb Javadimanesh
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2013, DOI: 10.4236/jmmce.2013.16051
Abstract: There are mainly two methods of deep drawing analysis: experimental and analytical/numerical. Experimental analysis can be useful in analyzing the process to determine the process parameters that produce a defect free product, and the analytical/numerical modeling can be used to model and analyze the process through all stages of deformation. This approach is less time consuming and more economical. Sheet metal forming often includes biaxial in-plane deformation with non-proportional strain paths. In deep drawing of cylindrical cup, the deformation in the flange is dominated by pure shear deformation, while it changes to plane strain when the material is drawn into the die. This paper deals with the analysis of deep drawing of circular blanks into axi-symmetric cylindrical cup using numerical modeling. The blank drawability has been related both theoretically and experimentally with the initial diameter of the blank and deep drawing parameters. The strains in the radial and circumferential directions have been measured. A correlation on the flange thickness variation by taking into account the work hardening with the analytical and experimental values also has been searched.
The Effect of Microstructural and Geometric Inhomogeneities Induced by Laser for Forming Strain Analysis on Sheet Metal Formability  [PDF]
Sergey Guk, Daria Plotnikova, Rudolf Kawalla
Materials Sciences and Applications (MSA) , 2016, DOI: 10.4236/msa.2016.75025

A commercially available laser marking system based on diode-pumped Nd:YVO4 laser was used for creating grid patterns for forming strain analysis of a dual-phase steel. The aim was to determine and analyze the influence of laser working parameters on the formability of sheet material by means of an in-depth characterization of this induced microstructural and geometric inhomogeneity. The electrochemical etching served as the reference method without the negative effect of generating inhomogeneity. The formability was evaluated using the cupping test according to Erichsen. While the quantification of geometric inhomogeneity was based on the determination of the notch factor, light microscopy and microhardness measurement were used for the evaluation of microstructural inhomogeneity. Furthermore, on the basis of the results an empirical regression model was established which described in terms of quantity the relationship between the examined factors such as laser power, pulse frequency and scanning speed as well as the command variable and the mark depth. The results showed that microstructural inhomogeneity in the used marking parameters due to their locally very limited formation did not have an appreciable influence on the mechanical properties. In contrast to this, the induced geometric inhomogeneity had a marked influence on the material formability.

Vyankatesh B.Emche,,Prof. M. D. PasarkAsstt
International Journal of Innovative Technology and Exploring Engineering , 2012,
Abstract: As method for punching in oval shapes is not readily available, press tool for punching in oval shapes is required in various industries according to their applications. There are press tools for punching in circular shape, but when shapes other than circular shape are desired, they have to design according to dimensions required by industry. As application for oval shape punching differs from industry to industry because dimensions required by industries differ from each other. As some industries require more than one oval shaped holes that is to be done in single stroke for reducing the time required for production, there is need to design such press tool which can perform such operation. Hence to have fast production of required oval size holes, there is need to develop a press tool assembly which can make accurate oval holes on metal sheets. For designing such assembly, it is very necessary to study every aspect of existing design of press tool so that changes required can be easily define. Comparison of existing design with the proposed enables us to find correct way of design.
Comparison of technology of forming the sheet metal by numerical simulations
I. Pahole,M. Puc,B. Vaupoti?,J. Bali?
Journal of Achievements in Materials and Manufacturing Engineering , 2006,
Abstract: Purpose: The paper is concerned about the problems in forming low-carbon and stainless sheet metal in parallelon the same tools. It describes the properties of stainless sheet metal and the comparison with ordinary sheetmetal of DC04 quality. Differences in physical properties pose a source of problems occurring in forming bothsheet metals of the same geometry.Design/methodology/approach: Numerical simulation methods of deep drawing have been used for planningthe technology of forming low-carbon and stainless sheet metal. For establishing basic properties of material theconventional testing methods have been used.Findings: The target of researches was to find out what changes have to be made in the forming tools, when thesheet metal from stainless steel is formed.Research limitations/implications: : Comparison of formability of sheet metals was limited only to materialssuitable for use in production of household appliances.Practical implications: The research is practically employed in forming sheet metal parts for household appliances.Originality/value: By the use of the method described it is possible to determine in advance, how the formingtool must be made. Our aim was to make a forming tool suitable for forming sheet metal from stainless andlow-carbon steel. The paper presents actual constructions.

JWang School of Mechanical,Manufacturing,Medical Engineering,Queensland University of Technology,GPO Box,Brisbane,Qld,Australia,
J.Wang School of Mechanical
,Manufacturing and Medical Engineering,Queensland University of Technology,GPO Box,Brisbane,Qld.,Australia

金属学报(英文版) , 1999,
Abstract: An experimental investigation is outlined for the CO 2 laser cutting process of metallic coated sheet steels, GALVABOND. It shows that by proper control of the cutting parameters, good quality cuts are possible at high cutting rate. Visual examination indicates that when increasing the cutting rate to as high as 5000 mm/min (about 100 times that suggested previously), kerfs of better quality can be achieved. Some kerf characteristics such as the width, heat affected zone and dross in terms of the process parameters are also discussed. A statistical analysis has arrived at a recommendatio on the optimum cutting parameters forprocessing GALVABOND.
El conformado incremental como nueva técnica de prototipado rápido
Miguel ángel Peydró Rasero,Samuel Sanchez Caballero,Elena Pérez Bernabeu,Miguel ángel Sellés Cantó
3c Tecnologia , 2012,
Abstract: Various industrial sectors (aerospace, automotive,) use forming processes nowadays to produce components of complex shapes from sheet metal. Traditional processes that use arrays are suitable for the production of large volumes of parts, but are not profitable for small series (special vehicles, prototypes, ...). Incremental forming is a different process, intelligent and flexible, which presents itself as an alternative to traditional forming methods. This process is based on Rapid Manufacturing methodologies, and greatly reduces tooling costs, since it only requires a simple tool support. It’s well suited to the manufacture of prototypes and small series by low production costs, but the time required to manufacture a part, typically several hours, which makes it impractical for longer runs.
Applications of evolutionary algorithms to sheet metal forming processes: A review
Kakandikar G.M.,Darade P.D.,Nandedkar V.M.
International Journal of Machine Intelligence , 2009,
Abstract: Metal forming processes are compression-tension processes involving wide spectrum ofoperations and flow conditions. The result of the process depends on the large number of parameters andtheir interdependence. The selection and optimization of various parameters is still based on trial and errormethods. In this paper the authors presents a compressive study of application of evolutionary strategies tooptimize the geometry parameters such as die design and punch design, process parameters such asforming load, blank holder pressure and coefficient of friction, the spring back, hammering sequence etc.Evolutionary algorithms offer many advantages over traditional methods. These are widely used now daysfor sheet metal industry.
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