Relevant bibliographies by topics / Sheet metal forming

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Sheet metal forming'

Author: Grafiati
Published: 4 June 2021
Last updated: 8 June 2024

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Journal articles on the topic "Sheet metal forming"

1

Schedin, Erik. "Sheet metal forming." Materials & Design 13, no. 6 (January 1992): 366–67. http://dx.doi.org/10.1016/0261-3069(92)90017-c.

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TAKAHASHI, Susumu. "Sheet Metal Forming and Forming Simulation." Journal of the Japan Society for Technology of Plasticity 57, no. 662 (2016): 167–68. http://dx.doi.org/10.9773/sosei.57.167.

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Schneider, Thomas, and Marion Merklein. "Sheet-Bulk Metal Forming of Preformed Sheet Metal Parts." Key Engineering Materials 473 (March 2011): 83–90. http://dx.doi.org/10.4028/www.scientific.net/kem.473.83.

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Due to ecological and economic challenges there is a rising demand on closely-tolerated complex functional components. Regarding short process chains and improved mechanical properties conventional forming processes are often limited. A promising approach to meet these requirements can be seen in the combination of traditional sheet and bulk metal forming processes, to form sheet metals out of the sheet plane with typical bulk forming operations. The challenge of applying conventional bulk forming operations on sheet metal is the interaction between regions of high and low deformation, which is largely unknown in literature. To analyze this topic fundamentally, a process combination of deep drawing and upsetting is developed for manufacturing tooth-like elements at pre-drawn cups. To fully understand material flow out of the sheet plane into the tooth cavity and to identify and qualify process factors depending on the functional elements´ geometry and friction, a single upsetting stage forming a simplified model of the blank is virtually analyzed with finite-element simulation. By inhibiting the forming history of the pre-drawn blank, the upsetting process can be investigated without interactions with a previous deep drawing operation.
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Q. Nadeem, Q. Nadeem, W. J. Seong W. J. Seong, and S. J. Na S. J. Na. "Process designing for laser forming of circular sheet metal." Chinese Optics Letters 10, no. 2 (2012): 021405–21407. http://dx.doi.org/10.3788/col201210.021405.

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Sieczkarek, Peter, Lukas Kwiatkowski, Nooman Ben Khalifa, and A. Erman Tekkaya. "Novel Five-Axis Forming Press for the Incremental Sheet-Bulk Metal Forming." Key Engineering Materials 554-557 (June 2013): 1478–83. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.1478.

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The incremental procedure of sheet-bulk metal forming was classified into two different forming sequences, the discrete and the continuous. Based on these two groups, a movement matrix was developed, which captures required kinematic motions to manufacture a variety of functional components. With the objective of producing near-net-shape workpiece geometries within the Collaborative Research Centre TR73 – sheet-bulk metal forming, the required positioning accuracies of conventional metal forming machines exceed the current state of the art. Therefore, a suitable machine concept was developed and realized. This new machine represents a unique prototype for a flexible application of bulk forming operations to 2 – 3 mm sheets with five motion axes. During continuous forming, such as rolling, and also during simultaneous operations, increased lateral forces prevail. The machine was provided with a high stiffness. That enables a positioning accuracy which, also under load and at rest, correlates the high demands of the sheet-bulk metal forming within a range of ±0.01 mm.
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Yang, Li Jun, Yang Wang, M. Djendel, and L. T. Qi. "Experimental Investigation on 3D Laser Forming of Metal Sheet." Materials Science Forum 471-472 (December 2004): 568–72. http://dx.doi.org/10.4028/www.scientific.net/msf.471-472.568.

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In this article, the relations between the formed shapes and process parameters had been studied for 3D laser forming of sheet metals. The investigation was performed on Stainless 1Cr18Ni9Ti sheet using a Nd:YAG laser source. The scanning strategies were being investigated to potentially achieve a more uniform temporal and spatial distribution of the laser energy, possibly leading to reduced part distortion, by scanning the beam across the sheet surface with both continuous and segmented irradiation geometries. The experimental results revealed that the cross spider scanning strategy could form square and circle sheets into spherical domes. And the radial lines scanning strategy could form rectangle sheets into saddle shapes. It was also apparent from the experimental results that the height of the center of the formed sheet increased with the increasing of the laser power and scanning numbers. The height of the formed square sheet firstly decreased with the laser scanning velocity increasing and began to decrease at a certain processing parameters by cross spider strategy, in which the circle sheet was opposite with the square sheet, and in which the rectangle sheet decreased with speed increasing.
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HINO, R., F. YOSHIDA, N. NAGAISHI, and T. NAKA. "INCREMENTAL SHEET FORMING WITH LOCAL HEATING FOR LIGHTWEIGHT HARD-TO-FORM MATERIAL." International Journal of Modern Physics B 22, no. 31n32 (December 30, 2008): 6082–87. http://dx.doi.org/10.1142/s0217979208051613.

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A new incremental sheet forming technology with local heating is proposed to form lightweight hard-to-form sheet metals such as aluminum-magnesium alloy (JIS A5083) sheet or magnesium alloy (JIS AZ31) sheet. The newly designed forming tool has a built-in heater to heat the sheet metal locally and increase the material ductility around the tool-contact point. Incremental forming experiments of A5083 and AZ31 sheets are carried out at several tool-heater temperatures ranging from room temperature to 873K using the new forming method. The experimental results show that the formability of A5083 and AZ31 sheets increases remarkably with increasing local-heating temperature. In addition, springback of formed products decreases with increasing local-heating temperature. The developed incremental sheet forming method with local heating has great advantages in not only formability but also shape fixability. It is an effective forming method for lightweight hard-to-form sheet metal for small scale productions.
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Moritoki, Hajime. "Forming limit of sheet metal." Transactions of the Japan Society of Mechanical Engineers Series A 56, no. 522 (1990): 352–58. http://dx.doi.org/10.1299/kikaia.56.352.

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Tekkaya, A. Erman, Michael Trompeter, and Jorg Witulski. "Innovative sheet metal-forming processes." International Journal of Mechatronics and Manufacturing Systems 1, no. 2/3 (2008): 157. http://dx.doi.org/10.1504/ijmms.2008.020502.

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Childs, T. H. C. "Mechanics of sheet metal forming." Tribology International 27, no. 1 (February 1994): 57–58. http://dx.doi.org/10.1016/0301-679x(94)90065-5.

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Dissertations / Theses on the topic "Sheet metal forming"

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Ali, Ahmed. "Incremental sheet metal forming." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0020/MQ54441.pdf.

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Gåård, Anders. "Wear in sheet metal forming." Licentiate thesis, Karlstad University, Faculty of Technology and Science, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-1592.

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The general trend in the car body manufacturing industry is towards low-series production and reduction of press lubricants and car weight. The limited use of press lubricants, in combination with the introduction of high and ultra-high strength sheet materials, continuously increases the demands of the forming tools. To provide the means of forming new generations of sheet material, development of new tool materials with improved galling resistance is required, which may include tailored microstructures, introducing of specific(MC, M(C,N))carbides and nitrides, coatings and improved surface finish. In the present work, the wear mechanisms in real forming operations have been studied and emulated on a laboratory scale by developing a test equipment. The wear mechanisms identified in the real forming process, were distinguished into a sequence of events consisting of initial local adhesive wear of the sheets resulting in transfer of sheet material to the tool surfaces. Successive forming operations led to growth of the transfer layer and initiation of scratching of the sheets. Finally, scratching changed into severe adhesive wear, associated with gross macroscopic damage. The wear process was repeated in the laboratory test-equipment in sliding between several tool materials, ranging from cast iron to conventional ingot cast tool steels to advanced powder metallurgy tool steel, against dual-phase carbon steel sheets. By use of the test-equipment, selected tool materials were ranked regarding wear resistance in sliding against ferritic-martensitic steel sheets at different contact pressures.

Wear in sheet metal forming is mainly determined by adhesion; initially between the tool and sheet surface interaction and subsequently, after initiation of material transfer, between a sheet to sheet contact. Atomic force microscopy force curves showed that adhesion is sensitive to both chemical composition and temperature. By alloying of iron with 18wt.% Cr and 8wt.% Ni, alloying in itself, or changes in crystal structure, led to an increase of 3 times in adhesion at room temperature. Hence, alloying may be assumed a promising way for control of adhesive properties. Additionally, frictional heating should be controlled to avoid high adhesion as, generally, adhesion was found to increase with increasing temperature for all investigated materials.

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Gåård, Anders. "Wear in sheet metal forming /." Karlstad : Faculty of Technology and Science, Materials Engineering, Karlstad University, 2008. http://www.diva-portal.org/kau/abstract.xsql?dbid=1592.

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Carlsson, Per. "Surface Engineering in Sheet Metal Forming." Doctoral thesis, Uppsala University, Department of Materials Science, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4764.

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In recent years, surface engineering techniques have been developed in order to improve the tribological performance in many industrial applications. In sheet metal forming processes, the usage of liquid lubricants can be decreased by using self lubricated tribo surfaces which will result in more environmentally friendly workshops. In the present work two different concepts, i.e. the deposition of thin organic coatings on the steel sheet and PVD coatings on the tool, have been evaluated. The sheet materials investigated include Zn and 55%Al-Zn metal coated steel sheet, which in general are difficult materials to form under dry conditions since they are sticky and thus have a high tendency to adhere to the tool surface. The PVD coatings include CrN, TiN and various DLC coatings. The work comprises tribo testing and post test characterisation using surface analytical techniques in order to evaluate the tribological properties of the tribo surfaces. The tribological tests of different tribo couples were conducted by using modified scratch testing and ball-on-disc testing. From these test results different friction and wear mechanisms have been identified.

The deposition of thin organic coatings on the steel sheet metal has been found to be promising in order to control the friction and to avoid metal-metal contact resulting in galling. However, it has been found that the tribological characteristics of organic coated steel sheet are strongly influenced by coating chemical composition, the substrate surface topography and the coating thickness distribution.

The performance of the PVD coatings depends mainly on the chemical composition and topography of the coated surface. By choosing PVD coatings such as diamond like carbon (DLC) low and stable friction coefficients can be obtained in sliding contact against Zn. Surface irregularities such as droplet-like asperities may cause an initial high friction coefficient. However, after a running in process or by polishing the PVD coating low friction coefficients can be obtained resulting in a stable sliding contact.

The combination of imaging (optical profilometry, LOM, SEM) and chemical analytical techniques (EDS, AES, ToF-SIMS) gave valuable information concerning the friction and wear properties of the tribo surfaces investigated.

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Lindberg, Filip. "Sheet Metal Forming Simulations with FEM." Thesis, Umeå universitet, Institutionen för fysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-51527.

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The design of new forming tools get more problemtic as the geometries get more complicated and the materials less formable. The idea with this project is to evaluate if an implementation of a simulation software in the designing process, to simulate the forming process before actually building the tools, could help Duroc Tooling avoid expensive mistakes. To evaluate this, the commercial FEM simulation software LS-DYNA was used in a complicated project, where the design of the forming tools for forming a girder was considered. The main objective was to avoid cracking and severe wrinkling which may result in the forming process. With help of simulations a stable forming process which did not yield cracks or severe wrinkling, was eventually found. The girder was almost impossible to form without cracking, but the breakthrough came when we tried to simulate a preforming step which solved the problem. Without a simulation software this would never have been tested since it would be to risky and expensive to try an idea which could turn out to be of no use. The simulations also showed that the springback - shape deformation occuring after pressing - was large and hard to predict without simulations. Therefore, the tools were also finally springback compensated. We concluded that simulations are very effective to quickly test new ideas which may be necessary when designing the tools for forming complicated parts. Simulation also provided detailed quantitative information about the expected cracks, wrinkles, and weaknesses of the resulting pieces. Even though there is cost associated with simulations, it is obvious from this project that a simulation software is a must if Duroc Tooling wants to be a leading company in sheet metal forming tools, and stand ready for the higher demands on the products in the future.
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Lanzon, Joseph, and kimg@deakin edu au. "EVALUATING LUBRICANTS IN SHEET METAL FORMING." Deakin University. Department of Science and Engineering, 1999. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20040428.095238.

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The sheet metal forming process basically involves the shaping of sheet metal of various thickness and material properties into the desired contours. This metal forming process has been extensively used by the automotive industry to manufacture both car panels and parts. Over the years numerous investigations have been conducted on various aspects of the manufacturing process with varied success. In recent years the requirements on the sheet metal forming industry have headed towards improved stability in the forming process while lowering environmental burdens. Therefore the overall aim of this research was to identify a technique for developing lubricant formulations that are insensitive to the sheet metal forming process. Due to the expense of running experiments on production presses and to improve time efficiency of the process the evaluation procedure was required to be performed in a laboratory. Preliminary investigations in the friction/lubricant system identified several laboratory tests capable of measuring lubricant performance and their interaction with process variables. However, little was found on the correlation between laboratory tests and production performance of lubricants. Therefore the focus of the research switched to identifying links between the performance of lubricants in a production environment and laboratory tests. To reduce the influence of external parameters all significant process variables were identified and included in the correlation study to ensure that lubricant formulations could be desensitised to all significant variables. The significant process variables were found to be sensitive to die position, for instance: contact pressure, blank coating of the strips and surface roughness of the dies were found significant for the flat areas of the die while no variables affected friction when polished drawbeads were used. The next phase was to identify the interaction between the significant variables and the main lubricant ingredient groups. Only the fatty material ingredient group (responsible for the formation of boundary lubricant regimes) was found to significantly influence friction with no interaction between the ingredient groups. The influence of varying this ingredient group was then investigated in a production part and compared to laboratory results. The correlation between production performance and laboratory tests was found to be test dependant. With both the Flat Face Friction test and the Drawbead Simulator unaffected by changes in the lubricant formulation, while the Flat Bottom Cup test showing similar results as the production trial. It is believed that the lack of correlation between the friction tests and the production performance of the lubricant is due to the absence of bulk plastic deformation of the strip. For this reason the Ohio State University (OSU) friction test was incorporated in the lubricant evaluation procedure along with a Flat Bottom Cup test. Finally, it is strongly believed that if the lubricant evaluation procedure highlighted in this research is followed then lubricant formulations can be developed confidently in the laboratory.
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Jansson, Tomas. "Optimization of sheet metal forming processes /." Linköping : Univ, 2005. http://www.bibl.liu.se/liupubl/disp/disp2005/tek936s.pdf.

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Shouler, Daniel Reginald. "Expanded forming limit testing for sheet forming processes." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609473.

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Park, Young-Bin. "Sheet metal forming using rapid prototyped tooling." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/18361.

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Powell, Nicholas Newton. "Incremental forming of flanged sheet metal components." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357609.

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Books on the topic "Sheet metal forming"

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Engineers, Society of Automotive, and Society of Automotive Engineers. World Congress, eds. Sheet metal forming. Warrendale, PA: Society of Automotive Engineers, 2002.

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Sheet metal forming. Bristol: Hilger, 1991.

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Merklein, Marion, A. Erman Tekkaya, and Bernd-Arno Behrens, eds. Sheet Bulk Metal Forming. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-61902-2.

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Banabic, Dorel. Sheet Metal Forming Processes. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-88113-1.

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International, ASM, and ASM International. Handbook Committee, eds. Metalworking: Sheet forming. Materials, Park, Ohio: ASM International, 2006.

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International Deep Drawing Research Group. Congress. Controlling sheet metal forming processes. [Metals Park, Ohio]: ASM International, 1988.

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Marciniak, Z. Mechanics of sheet metal forming. 2nd ed. Oxford: Butterworth-Heinemann, 2002.

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L, Duncan J., ed. Mechanics of sheet metal forming. London: Edward Arnold, 1992.

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Joseph, Matt. Automotive sheet metal forming & fabrication. North Branch, MN: CarTech, 2011.

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Tang, Sing C. Mechanics modeling of sheet metal forming. Warrendale, PA: SAE International, 2007.

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Book chapters on the topic "Sheet metal forming"

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Kawai, K., H. Koyama, T. Kamei, and W. Kim. "Boss Forming, An Environment-Friendly Rotary Forming." In Sheet Metal 2007, 947–53. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-437-5.947.

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Jeswiet, J., David J. Young, and M. Ham. "Non-Traditional Forming Limit Diagrams for Incremental Forming." In Sheet Metal 2005, 409–16. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-972-5.409.

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Klocke, Fritz. "Sheet Metal Forming." In Manufacturing Processes 4, 293–405. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-36772-4_4.

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Vollertsen, Frank. "Sheet Metal Forming." In Lecture Notes in Production Engineering, 135–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-30916-8_5.

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Meier, H., V. Smukala, O. Dewald, and Jian Zhang. "Two Point Incremental Forming with Two Moving Forming Tools." In Sheet Metal 2007, 599–605. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-437-5.599.

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Allwood, J. M., D. R. Shouler, and A. Erman Tekkaya. "The Increased Forming Limits of Incremental Sheet Forming Processes." In Sheet Metal 2007, 621–28. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-437-5.621.

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Jeswiet, J. "Asymmetric Incremental Sheet Forming." In Sheet Metal 2005, 35–58. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-972-5.35.

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Deb, S., and S. K. Panigrahi. "Bending of Sheet Metals." In Metal Forming Processes, 27–45. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003226703-3.

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Bambach, M., M. Todorova, and Gerhard Hirt. "Experimental and Numerical Analysis of Forming Limits in CNC Incremental Sheet Forming." In Sheet Metal 2007, 511–18. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-437-5.511.

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Schulze Niehoff, H., and Frank Vollertsen. "Non-Thermal Laser Stretch-Forming." In Sheet Metal 2005, 433–40. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-972-5.433.

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Conference papers on the topic "Sheet metal forming"

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Bari, N. "Experimental investigation on thinning and forming force acting on multi-stage single point incremental forming." In Sheet Metal 2023. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902417-7.

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Abstract. This paper describes a study of thinning and forming force in multi-stage single point incremental forming. Four process parameters namely pitch, tool diameter, blank thickness and initial draw angle are considered to study their influence on maximum thinning and peak forming force. Experiments are designed using face-centered composite design (CCD). Experimental results are analyzed using analysis of variance (ANOVA). It is found that initial draw angle is the most influencing parameter for maximum thinning, while peak forming force is most influenced by blank thickness. Maximum thinning decreases with decrease in initial draw angle and increase in blank thickness. Peak forming force decreases with decrease in blank thickness. Moreover, predictive models are developed for maximum thinning and peak forming force. Also, optimization of parameters is carried out to minimize thinning and forming force. The confirmation tests are performed to validate predictive model and optimization results.
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Holzmüller, M. "Proof of concept for incremental sheet metal forming by means of electromagnetic and electrohydraulic high-speed forming." In Sheet Metal 2023. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902417-2.

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Abstract. The combination of incremental sheet metal forming and high-speed forming offers new possibilities for flexible forming processes in the production of large sheet metal components of increased complexity with relatively low forming energies. In this paper, the general feasibility and process differences between the pulse-driven high-speed forming technologies of electrohydraulic and electromagnetic forming were investigated. An example component made of EN AW 6016 aluminum sheet metal was thus formed incrementally by both processes and the forming result evaluated by an optical 3D measurement system. For this purpose, a forming strategy for electromagnetic incremental forming (EMIF) was developed, tested and adapted to the electrohydraulic incremental forming process (EHIF). The discharge energy, the tool displacement and the pressure field of the forming zone were determined as relevant parameters for the definition of an adequate tool path strategy. It was found that the EHIF process is less affected by larger distances between the tool and the blank, while this is a critical variable for force application to the component during EMIF. On the other hand, the more uniform pressure distribution of the EMIF process is advantageous for forming large steady component areas.
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Harhash, M. "Warm forming of thermoplastic fibre metal laminates." In Sheet Metal 2023. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902417-54.

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Abstract. In this paper, the forming behaviour of sheet-like metal/polymer/metal (MPM) and thermoplastic fibre metal laminates (TFMLs) is introduced. TFMLs are based on thin metallic cover sheets and fibre-reinforced thermoplastic matrix (here polyamide 6). With this material combination, the specific mechanical, structural, thermal and acoustic properties can be improved and designed compared to the monomaterials and laminates without fibre reinforcements. However, the restricted formability of TFMLs at room temperature is a strong limitation. Therefore, the approach of this study is concerned with the fundamental description of the influence of warm forming on the degree of the forming improvement of pre-bonded TFMLs sheets experimentally via the investigation of the deep drawability and determining the forming limit curves compared to the formability of steel and MPM sheets. Two elevated test temperatures (200 and 235 °C) besides the room temperature are considered. The results of this approach revealed that warm forming could lead to over 300 % improvement of the forming limit curve (FLC) level of TFML; however, an ignorable difference between 200 and 235 °C is found. For steel and MPM sheets, increasing the temperature showed a slight improvement. Regarding deep drawing, similar results like for FLC were found, where the drawing depth of TFML could be increased from approx. 15 mm up to at least 40 mm before cracking. However, other failure types arose like wrinkling and core squeezing-out. Therefore, a one-step deep drawing approach for TFMLs is foreseen, where the adhesion and forming processes take place simultaneously.
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Müller, P. "Development of polygon forming processes for aerospace engineering." In Sheet Metal 2023. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902417-9.

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Abstract. The focus of this research lays on the further development of the Polygon Forming Technology, which is already successfully used for cold forming components in the aerospace industry. One example is the fuselage shell of the Airbus Beluga XL. According to the current state of the art it is possible to incrementally form large cylindrical or conical fuselage components by Polygon Forming. With the use of so-called infills, the Polygon Forming process can also be used to form components with pockets milled in the initial plane state. The limits of this technology exclude the creation of spherical geometries, such as those used in the front or rear fuselage sections of aircrafts. Presently, such components are produced by more complex stretch forming processes, which result in a considerable amount of scrap. In this work, a tool is developed to replicate the Polygon Forming process on experimental scale at the Institute of Forming Technology and Machines (IFUM) for materials commonly used in aerospace engineering. In addition, a downscaled pre-test tool is developed to investigate different tool geometries for incremental spherical forming inexpensive and easy according to the method of rapid prototyping.
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Shrivastava, A. "Effect of process variables on interface friction characteristics in strip drawing of AA5182 alloy in warm forming temperature range." In Sheet Metal 2023. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902417-52.

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Abstract. Warm forming is widely used to enhance formability of aluminum alloy sheets in order to manufacture components with complex shapes. However, forming of aluminum alloy sheets by various sheet metal forming processes such as deep drawing and stretch forming involves sliding, drawing or stretching of sheet materials over the tool surfaces. Warm forming results in change of frictional characteristics at the tool-blank interface during forming. Higher friction leads to poor formability, non-uniform strain distribution, higher forming load, and poor surface finish of the component. So it is important to investigate the effect of process variables on friction at the interface in warm forming of aluminum alloy sheets. In this work, the tribological behavior of an Al-Mg-Mn alloy (AA5182) has been studied by performing strip drawing experiments in the warm forming temperature range (100-250 °C) in lubricated condition. Experiments were conducted to investigate the effect of temperature, normal force, and drawing speed on the coefficient of friction. A significant impact on the friction coefficient is observed by the change in boundary conditions as a result of variation in process variables with temperature being the most influential. The results have been compared with frictional characteristics in strip drawing at ambient temperature.
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Brun, M. "Friction behavior under magnetorheological lubricant in sheet metal forming process." In Sheet Metal 2023. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902417-35.

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Abstract. The increasingly high standards required in sheet metal forming industry, both geometrical and aesthetical, lead to continuous search of solutions to control the metal sheet flow during deformation. As alternative to traditional draw beads or hydraulically controlled segmented dies, the possibility of locally varying the material tangential speed by adapting the surface tribology at the interface between the blank and the blank holder represents a still unexplored scenario. The paper presents the feasibility analysis of the use of magneto-rheological (MR) fluids as lubricants in stamping, exploiting their ability to vary their rheological behaviour in response to external magnetic fields. To this aim, a new strip drawing test bench was developed to investigate the friction behaviour of MR fluids under different magnetic fields. The cold stamping of DC05 steel sheet was taken as reference case to investigate the influence of typical process parameters such as contact pressure, sliding speed and magnetic field.
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7

Hertzel, A. "Investigation on the shear cutting of functional components manufactured in an orbital forming process." In Sheet Metal 2023. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902417-8.

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Abstract. Applying forming operations for the manufacturing of complex functional components instead of conventional shearing or milling is an effective way to increase the material efficiency of the process as well as the mechanical properties of the part. Nevertheless, in many cases subsequent cutting operations are mandatory to reach the final geometry or to add functional surfaces for the later assembly. During forming, hardening effects or different strain states can cause difficulties for the subsequent cutting operation. These characteristics are commonly determined for sheet metal forming processes like deep drawing or bending. However, the complex stress and strain states during sheet-bulk metal forming operations and their influence on the cutting parameters or the part properties have not been investigated comprehensively so far. Furthermore, different assigned processes, like for example orbital forming, allow a local material distribution, realizing a gradient in sheet thickness. Therefore, this contribution focuses on the establishment of a fundamental process understanding on the influence of a sheet-bulk metal forming process on the cutting parameters and the resulting part properties. Functional components are manufactured from C10 sheet metal by orbital forming and subsequently shear cut to generate the final contour. During cutting, specific force-stroke diagrams are evaluated, in order to analyze the influence on the process parameters. The resulting properties of the parts are investigated regarding the quality of the cutting surface and a potential geometrical distortion in consequence of elastic spring back. The influence of the forming process is outlined by a direct comparison with conventionally cut components.
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8

Vanhulst, M. "Reverse rigid body motion in multi-stage single point incremental forming." In Sheet Metal 2023. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902417-11.

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Abstract. This paper provides an analysis of the Rigid Body Motion (RBM) in multi-stage Single Point Incremental Forming of a cylindrical cup. The RBM is studied using Digital Image Correlation to track the material in each contour of the tool, resulting in a better understanding of the RBM phenomenon than has been shown in literature. The study shows that the highest Z-translations of the midpoint of the cone take place in the last contours of each stage, where these RBM peaks also increase per stage. An interesting observation is a reverse rigid body motion, appearing in the contours close to the end of a stage, right before the sudden drop of the bottom in the last contours. This causes flattening of the bottom of the cone and results in a smaller RBM per stage for the later forming stages. Additionally, the stepover between two intermediate stages has been shown to have an important effect on the stepped features appearing in the bottom, but did not have a significant effect on the accuracy of the midpoint of the cone.
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Rath, J. E. "Die-less forming of fiber-reinforced thermoplastic sheets and metal wire mesh." In Sheet Metal 2023. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902417-5.

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Abstract. The growing market for fiber-reinforced thermoplastics (FRTP) requires new flexible production processes for prototype and small series production, as conventional forming techniques involving molds are not cost efficient in these cases. Inspired by incremental sheet metal forming (ISF), an alternative manufacturing processes for the forming of FRTP with just two robot guided standard tools is outlined. To maintain a locally formed shape in the heated, flexible fabric, auxiliary wire mesh metal is used as it has similar deformation mechanisms, especially shearability, while being sufficiently self-supporting. Feasibility of the approach is discussed and investigated in basic experiments.
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Ott, M. "Numerical and experimental investigation on the applicability of elastomer tooling components for the manufacturing of undercut geometries by sheet metal forming." In Sheet Metal 2023. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902417-36.

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Abstract. Due to their approximately hyperelastic properties, elastomers are suitable as a material for forming tools with extended forming capabilities. In this work, the use of two elastomer punches for manufacturing undercuts in sheet metal forming is performed experimentally for a demonstrator component. Since the manufacturing process does not require the use of cam slide units, it is aimed at rapid prototyping and small batch applications with the goal of reducing tooling cost and complexity. Additionally, the prediction accuracy of the elastomer tool deformation during forming was investigated in a finite element model of the manufacturing process. For comparison with the experimental implementation, punch force measurements and in-process optical strain measurements with a stereo camera system were carried out.
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Reports on the topic "Sheet metal forming"

1

Kiridena, Vijitha, Ravi Verma, Timothy Gutowski, and John Roth. Rapid Freeform Sheet Metal Forming: Technology Development and System Verification. Office of Scientific and Technical Information (OSTI), March 2018. http://dx.doi.org/10.2172/1433826.

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2

Johnson, K., M. Smith, C. Lavender, and M. Khalell. Technology maturation project on optimization of sheet metal forming of aluminum for use in transportation systems: Final project report. Office of Scientific and Technical Information (OSTI), October 1994. http://dx.doi.org/10.2172/10194501.

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