Journal articles: '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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10

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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11

Demeri, M. Y. "Drawbeads in sheet metal forming." Journal of Materials Engineering and Performance 2, no. 6 (December 1993): 863–66. http://dx.doi.org/10.1007/bf02645686.

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12

Hosford, William F., and John L. Duncan. "Sheet metal forming: A review." JOM 51, no. 11 (November 1999): 39–44. http://dx.doi.org/10.1007/s11837-999-0221-5.

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13

Merklein, M., J. M. Allwood, B. A. Behrens, A. Brosius, H. Hagenah, K. Kuzman, K. Mori, A. E. Tekkaya, and A. Weckenmann. "Bulk forming of sheet metal." CIRP Annals 61, no. 2 (2012): 725–45. http://dx.doi.org/10.1016/j.cirp.2012.05.007.

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Merklein, Marion, Daniel Gröbel, Maria Löffler, Thomas Schneider, and Philipp Hildenbrand. "Sheet-bulk metal forming – forming of functional components from sheet metals." MATEC Web of Conferences 21 (2015): 01001. http://dx.doi.org/10.1051/matecconf/20152101001.

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Bhandari, Krishna Singh, Shahid Aziz, Wen Ning Chen, Si Jia Li, and Dong Won Jung. "Deformation Evaluation of A5052 Sheet Metal in SPIF Process." Materials Science Forum 1084 (April 13, 2023): 91–95. http://dx.doi.org/10.4028/p-e6768o.

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The single point incremental forming (SPIF) process is a high-trend method for forming a metal in a desirable shape. Forming parameters is an important part of deforming metal sheets. So, while reshaping a metal sheet parameters like tools, toolpath, material properties, sheet thickness, and lubricant were considered. Since the Aluminum sheet is used world widely for the body parts of machines for manufacturing parts. So, an A5052 metallic sheet was formed for the improvement of the depth deforming through the SPIF process. While forming an A5052 sheet lubricant was used constantly. After deforming through the SPIF process, further evaluations of the formed part were examined with the nanoprofiling machine to evaluate the deformed areas. Moreover, the deformed part was analyzed for the nana profiling for the deformation occurs on the surface. Likewise, before forming a part, the A5052 design was computer analysis. The simulation part was studied for fixing the maximum depth.

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Zhou, Jian Zhong, Yong Kang Zhang, Xing Quan Zhang, Chao Jun Yang, Hui Xia Liu, and Ji Chang Yang. "The Mechanism and Experimental Study on Laser Peen Forming of Sheet Metal." Key Engineering Materials 315-316 (July 2006): 607–11. http://dx.doi.org/10.4028/www.scientific.net/kem.315-316.607.

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Laser peen forming of sheet metal is a new plastic forming technique based on laser shock waves, which derives from the combination of laser shock processing and conventional shot peening technique, it uses high-power pulsed laser replacing the tiny balls to peen the surface of sheet metal, when the laser induced peak pressure of shock waves exceeds the dynamic yield strength of the materials, the sheet metal yields, resulting in an inhomogeneous residual stresses distribution in depth. The sheet metal responds to this residual stress by elongating at the peened surface and effectively bending the overall shape. On the basis of analyzing the mechanism of laser peen forming, the line-track-peening experiments of 45 steel sheets with 2 mm thickness were carried out; a curved sheet metal with deep layer of residual compressive stress was obtained. The preliminary experiment result shows that laser peen forming can offer desirable characteristics in shaped metals and is a valuable technique for producing components for a range of industries.

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Le, Khanh Dien, Tan Hung Nguyen, Ngoc Huy Tran, Thanh Son Le, Huy Bich Nguyen, and Thanh Nam Nguyen. "A Research of the Precision of Titanium Sheet Formed by Hot Incremental Sheet Forming Method." Key Engineering Materials 749 (August 2017): 154–60. http://dx.doi.org/10.4028/www.scientific.net/kem.749.154.

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Single Point Incremental Forming (SPIF) is a recent technology of forming sheet in several decades. Nowadays, SPIF technology is still continued to be studied, applied and ameliorated in sheet manufacturing in industry. However one of the difficulties of the technology is the forming angle is still small (smaller than 800 according the properties of metal sheets). This paper recommends a measure of increasing the plasticity of the sheet by heating in time of forming by SPIF technology. Naturally, the plasticity of metal sheet increases by the temperature of the material in forming process with its limitation and constraint. The paper represents the effect of heating metal sheet through the empirical process of SPIF technology directed by the design of experiment (DOE). The analyses of the results of experimental process is applied to show the effect of heating to the precision of Titanium sheet. Finally, some private opinions about the heating in SPIF are also mentioned as a very tiny contribution of the research for the new technology.

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Jeswiet, J. "Asymmetric Incremental Sheet Forming." Advanced Materials Research 6-8 (May 2005): 35–58. http://dx.doi.org/10.4028/www.scientific.net/amr.6-8.35.

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The use of computers in manufacturing has enabled the development of several new sheet metal forming processes. This paper describes modifications that have been made to traditional forming methods such as conventional spinning and shear forming, where deformation is localized. Recent advances have enabled this localized deformation to be accurately controlled and studied. Current developments have been focused on forming asymmetric parts using CNC technology, without the need for costly dies. Asymmetric Incremental Forming has the potential to revolutionize sheet metal forming, making it accessible to all levels of manufacturing.

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19

Jung, Dong Won. "Quadrilateral Shape Rib Forming by Roll Forming Process." Applied Mechanics and Materials 878 (February 2018): 296–301. http://dx.doi.org/10.4028/www.scientific.net/amm.878.296.

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The roll forming is one of the simplest manufacturing processes for meeting the continued needs of various industries. The roll forming is increasingly used in the automotive industry to form High Strength Steel (HSS) and Advanced High Strength Steel (AHSS) for making structural components. In order to reduce the thinning of the sheet product, traditionally the roll forming has been suggested instead of the stamping process. The increased product performance, higher quality, and the lowest cost with other advantages have made roll forming processes suitable to form any shapes in the sheets. In this numerical study, a Finite Element Method is applied to estimate the stress, strain and the thickness distribution in the metal sheet with quadrilateral shape, ribs formed by the 11 steps roll forming processes using a validated model. The metal sheet of size 1,000 × 662 × 1.6 mm taken from SGHS steel was used to form the quadrilateral shape ribs on it by the roll forming process. The simulation results of the 11 step roll forming show that the stress distribution was almost uniform and the strain distribution was concentrated on the ribs. The maximum thinning strain was observed in the order of 15.5 % in the middle rib region possibly due to the least degree of freedom of the material.

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20

Zhang, Yan, and Xingquan Zhang. "Effect of Sheet Thickness on Forming Precision in Single Laser Shock Forming with Mold." Journal of Physics: Conference Series 2617, no. 1 (October 1, 2023): 012013. http://dx.doi.org/10.1088/1742-6596/2617/1/012013.

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Abstract Laser shock forming (LSF) is one of the sheet metal dynamic forming techniques that employ laser-induced shock waves to form sheet metal into complex three-dimensional parts rapidly. This work investigates the effect of sheet thickness on the forming precision in laser shock forming with mold. ABAQUS/Explicit analysis software is adopted to study the effect of sheet metal thickness on forming accuracy. The corresponding forming experiments with sheet thickness arranged from 0.1mm to 0.4 mm are conducted to validate those numerical values. The numerical and experimental results indicate that the sheet thickness plays an important role in the precision of the formed parts, with the increase of sheet thickness, the forming precision is decreased.

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Stoughton, Thomas B. "Stress-Based Forming Limits in Sheet-Metal Forming." Journal of Engineering Materials and Technology 123, no. 4 (July 24, 2000): 417–22. http://dx.doi.org/10.1115/1.1398083.

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A strain-based forming limit criterion is widely used throughout the sheet-metal forming industry to gauge the stability of the deformed material with respect to the development of a localized neck prior to fracture. This criterion is strictly valid only when the strain path is linear throughout the deformation process. There is significant data that shows a strong and complex dependence of the limit criterion on the strain path. Unfortunately, the strain path is never linear in secondary forming and hydro-forming processes. Furthermore, the path is often found to be nonlinear in localized critical areas in the first draw die. Therefore, the conventional practice of using a path-independent strain-based forming limit criterion often leads to erroneous assessments of forming severity. Recently it has been reported that a stress-based forming limit criterion appears to exhibit no strain-path dependencies. Subsequently, it has been suggested that this effect is not real, but is due to the saturation of the stress-strain relation. This paper will review and compare the strain-based and stress-based forming limit criteria, looking at a number of factors that are involved in the definition of the stress-based forming limit, including the role of the stress-strain relation.

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Ding, Shichao, Paul A. Meehan, and William J. T. Daniel. "A novel sheet metal forming method—Millipede forming." Journal of Materials Processing Technology 211, no. 3 (March 2011): 376–81. http://dx.doi.org/10.1016/j.jmatprotec.2010.10.012.

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Hino, Ryutaro, Masato Nakamura, Yo Ishida, and Fusahito Yoshida. "Deformation Behavior and Formability of Sheet Metal Laminate Consisting of Perforated Core Sheet and Thin Skin Sheets." Key Engineering Materials 535-536 (January 2013): 254–57. http://dx.doi.org/10.4028/www.scientific.net/kem.535-536.254.

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This study presents a new type of sheet metal laminate for lightweight products, and investigates its plastic behavior and formability. The sheet metal laminate consists of three layers, i.e. two thin skin sheets and a perforated core sheet with round holes, which are bonded together by diffusion bonding. Pure copper sheets are used for both of the core and the skins. Plastic deformations of the laminate and its component layers under uniaxial and biaxial tension are examined experimentally and analytically. Results of uniaxial stress-strain responses and yield loci (contours of plastic work) show that the perforated core sheet exhibits anisotropic behavior induced by the hole array but the laminated sheet becomes rather isotropic. Forming limit diagrams of the laminate and its component layers are also obtained by performing stretch forming test. Forming limit of the perforated core sheet is markedly lower than that of the monolithic sheet, and that of the thin skin is in between. It is found that forming limit of the laminate is comparable to that of the thin skin.

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Jung, Dong Won. "A New Engineering Technique in Roller Design to Prevent Thinning of Sheet in Roll Forming Process." Applied Mechanics and Materials 873 (November 2017): 42–47. http://dx.doi.org/10.4028/www.scientific.net/amm.873.42.

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These days sheet metal forming is a widely used in different industrial fields with large production volumes. Formability of metal sheets is limited by localized necking and plastic instability. In sheet metal forming processes like drawing and stamping the main challenge is thinning of the metal sheet in some regions. To reduce thinning of the sheet product, roll forming has been suggested instead of stamping process. Thinning strain can cause necking, tearing or wrinkling which are failure of the metal sheet. In this study a new engineering technique is proposed in order to prevent thinning of the steel galvanized hot coil commercial (SGHC) in roll forming process. An explicit finite element code, ABAQUS software, was used to simulate the roll forming process. The results show that the proposed technique has an important effect on thinning of the sheet and can reduce it significantly. Investigation on the second and third and fourth rollers show the effect of modified roller dimension as on reducing the thickness. These reductions in second, third and fourth rollers are from 4 percent to 0.5 percent, 2.8 to 1.4 percent and from 1.4 to 0.7 percent respectively. The reasons of the new techniques effect were also discussed.

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Yang, Rui, Yu Liu, Peng Fei Wen, and Jun Hua Zhang. "Numerical Analysis of Sheet Metal Forming Limit for Local Forming." Advanced Materials Research 1028 (September 2014): 76–83. http://dx.doi.org/10.4028/www.scientific.net/amr.1028.76.

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Generally, the forming limit diagram is widely applied to predict the sheet necking and fracture in the conventional sheet forming process. In recent years, the fact that the forming limit is much higher using Incremental sheet forming (ISF) than that obtained in conventional sheet forming, has become a research hotspot in forming mechanism of local forming process. In this paper, the geometrical imperfection in the thickness was presumed to represent local weakening zone and the BAMMAN_DAMAGE material model which using void to describe non homogenization caused by geometric imperfection, were used respectively to investigate the effect of geometry imperfection on the sheet forming limit. Based on the W.C. Emmens’ experiment, the reason and mechanism of enhancement of forming limit during incremental forming was studied through the numerical simulation method. And the variations of stress and strain during the forming process were also studied.

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Meier, Horst, V. Smukala, O. Dewald, and Jian Zhang. "Two Point Incremental Forming with Two Moving Forming Tools." Key Engineering Materials 344 (July 2007): 599–605. http://dx.doi.org/10.4028/www.scientific.net/kem.344.599.

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This paper describes a new development of an incremental, robot based sheet metal forming process for the production of sheet metal components for limited-lot productions and prototypes. The kinematic based generation of the shape is implemented by means of two industrial robots, which are interconnected to a cooperating robot system. Compared to other incremental sheet metal forming machines this system offers a high geometrical form flexibility without the need of any workpiece dependent tools. The principle of the procedure is based on flexible shaping by means of a freely programmable path-synchronous movement of two robots. So far, the final shape is produced by the incremental infeed of the forming tool in depth direction and its movement along the contour in lateral direction on each level. The counter tool, with its simple geometry, was used to support the sheet metal on the backside by moving synchronously along the outer contour, constantly on the same level. This corresponds to a fixed backplate used in other incremental sheet metal forming processes. Due to the use of a new robot system with extended control algorithms for cooperating robots, it will be possible to release the counter tool from its constant path on the outer contour and support the forming tool right on the opposite side of the sheet to generate a predefined gap between the two hemispherical tools. This way at each moment a small part of a full die, as it is used in other processes, is simulated without the need of producing a workpiece dependent die. The extended payload of the new robot system gives the opportunity to form steel blanks, for the first time.

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Kopp, R., C. Wiedner, and A. Meyer. "Flexibly Rolled Sheet Metal and Its Use in Sheet Metal Forming." Advanced Materials Research 6-8 (May 2005): 81–92. http://dx.doi.org/10.4028/www.scientific.net/amr.6-8.81.

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Light weight construction is a construction philosophy which aims at maximum weight reduction. Reasons for light weight construction can be very diverse. One main cause can be to improve fuel efficiency. This can be achieved by use of load optimised sheet thicknesses. Another reason can be the increasing demands on crash performances by optimisation of local properties. This paper presents two production processes of flexibly rolled blanks, one with longitudinal and the other one with latitudinal thickness transitions. Both of them have been developed at the Institute of Metal Forming (IBF) and yet found their way into series production. The potential of these processes is already proved by a large range of products, especially in automotive industries. Some special deep drawing tests with flexibly rolled blanks have been conducted and their results are presented. Also process simulation has been carried out at the IBF and will be explained. One possibility with regard to optimise these products is shortly introduced. Completing this paper an outlook is given.

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Wang, Chang Jiang, Diane J. Mynors, and Tarsem Sihra. "Numerical Simulation of the Effect of Punch Paths on the Quality of Sheet Metal Stretch Forming." Applied Mechanics and Materials 217-219 (November 2012): 2002–5. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.2002.

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Presented here is the simulation of uniaxial stretch forming using two punches in a sheet metal forming operation. In the finite element modelling, the sheet metal strip was held by two bank holders and two punches are able to move in two directions to stretch the sheet metal. Due to the friction between the punch and sheet metal, it was found that friction affects the sheet metal forming quality, however by adopting an optimal punch path the effect of friction in sheet metal forming can be reduced. The effect of punch paths on the quality of the sheet metal are also reported in this paper.

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Vahdati, Mehdi, Ramezanali Mahdavinejad, and Saeid Amini. "Investigation of the ultrasonic vibration effect in incremental sheet metal forming process." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 231, no. 6 (April 8, 2015): 971–82. http://dx.doi.org/10.1177/0954405415578579.

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The mechanism of incremental sheet metal forming is based on plastic and localized deformation of sheet metal. The sheet metal is formed using a hemispherical-head tool in accordance with the path programmed into the computer numerical control milling machine controller. Experimental and numerical analyses have been performed previously on the application of ultrasonic vibration to various metal forming processes. However, thus far, the effects of ultrasonic vibration on incremental sheet metal forming have not been investigated. This article presents the process of design, analysis, manufacture and testing of a vibrating forming tool for the development of ultrasonic vibration–assisted incremental sheet metal forming. The results obtained from modal analysis and natural frequency measurement of the vibrating tool confirmed the emergence of a longitudinal vibration mode and resonance phenomenon in the forming tool. Then, the effect of ultrasonic vibration on incremental sheet metal forming was studied. The obtained experimental results from the straight groove test on Al 1050-O sheet metals showed that ultrasonic vibration led to decrease in the following parameters as compared with conventional incremental sheet metal forming: applied force on forming tool axis, spring-back and surface roughness of formed sample.

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Cheng, Xiao Min, Lin Zhou, Liang Wang, and Gen Zhou. "The Experiment Study of Water Jet Incremental Sheet Metal Forming." Advanced Materials Research 230-232 (May 2011): 1010–13. http://dx.doi.org/10.4028/www.scientific.net/amr.230-232.1010.

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For the manufacture of panel parts, incremental sheet metal forming is significant in reality. This study put forward a method of incremental sheet metal forming: High-handed water jet with constant pressure and speed that caused by high pressure system acts on sheet metal and makes it out of shape, following transmutation superposition the requisite parts can be made. Based on this theory, a system of incremental sheet metal forming by using water jet is designed. At the same time, a forming experiment device is developed which is used to test the influence of water jet pressure, sheet metal thick, target distance to forming result. Finally, the optimized technological parameters of forming will be obtained. Within the work range, the higher pressure of water jet is, the more obvious forming result will be, and a great target distance will make forming result worse, besides sheet metal thick can make a difference of it. If sheet metal thick is invariable, there is interaction among pressure, target distance and feed velocity, so they influence forming result together.

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Zhou, Liu Ru. "Strain Analysis of NC Incremental Sheet Metal Forming." Advanced Materials Research 418-420 (December 2011): 1586–89. http://dx.doi.org/10.4028/www.scientific.net/amr.418-420.1586.

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NC incremental sheet metal forming process is a flexible process which is to form the sheet point by point on NC forming machine according to the prepared program .The forming principle of NC incremental sheet metal forming process is presented. The strain is analysed. A formula of strain calculation is drawn in the NC incremental sheet metal forming process and verified by web experiment.

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HEO, SEONG-CHAN, TAE-WAN KU, JEONG KIM, BEOM-SOO KANG, and WOO-JIN SONG. "APPLICATION OF FORMING LIMIT CRITERIA BASED ON PLASTIC INSTABILITY CONDITION TO METAL FORMING PROCESS." International Journal of Modern Physics B 22, no. 31n32 (December 30, 2008): 5680–85. http://dx.doi.org/10.1142/s0217979208051005.

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Metal forming processes such as hydroforming and sheet metal forming using tubular material and thin sheet metal have been widely used in lots of industrial fields for manufacturing of various parts that could be equipped with mechanical products. However, it is not easy to design sequential processes properly because there are various design variables that affect formability of the parts. Therefore preliminary evaluation of formability for the given process should be carried out to minimize time consumption and development cost. With the advances in finite element analysis technique over the decades, the formability evaluation using numerical simulation has been conducted in view of strain distribution and final shape. In this paper, the application of forming limit criteria is carried out for the tube hydroforming and sheet metal forming processes using theoretical background based on plastic instability conditions. Consequently, it is confirmed that the local necking and diffuse necking criteria of sheet are suitable for formability evaluation of both hydroforming and sheet metal forming processes.

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HINO, Ryutaro. "Numerical Optimization of Metal Forming Process, Mainly Sheet Metal Forming Problem." Journal of the Japan Society for Technology of Plasticity 53, no. 615 (2012): 307–11. http://dx.doi.org/10.9773/sosei.53.307.

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Mori, Kenichiro. "Application of Servo Presses to Sheet Metal Forming." Key Engineering Materials 473 (March 2011): 27–36. http://dx.doi.org/10.4028/www.scientific.net/kem.473.27.

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Mechanical AC servo presses having high flexibility for control of motion have been recently developed. In these presses driven by servo motors, the slide motion is accurately controlled by real-time feedback of ram position measured with sensors like the conventional machine tools, and thus complicated motion is attainable. The application of servo presses to sheet metal forming processes is reviewed in the present paper. The springback in bending was reduced by bottoming and re-striking. In deep drawing, the forming limit of high strength steel sheets was improved by detaching tools from the sheet, and the wrinkling was prevented by applying a stepwise motion. A hot stamping process using rapid resistance heating and a servo press was developed to produce ultra-high strength steel parts.

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Li, Xinqi, and Shicheng Hu. "Numerical Simulation and Experimental Research on Multi-Point Forming of Aluminum Alloy Sheets Based on Ultrasonic Vibration." Mathematical Problems in Engineering 2022 (August 23, 2022): 1–11. http://dx.doi.org/10.1155/2022/7688376.

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In this study, the multi-point plastic forming of 2024-O aluminum alloy sheets is the research object, ultrasonic vibration-assisted forming is applied in the stamping process, a combination of ABAQUS/EXPLICITE numerical simulation and theory is used, and multi-point forming experiments are performed to verify the research. In the process of multi-point forming, the influence of ultrasonic vibration on the plastic deformation and springback of sheet metal has inspired a new idea and method for multi-point forming of sheet metal. This paper presents the following: the basic theory of multi-point stamping and ultrasonic vibration-assisted metal sheet plastic forming; a comparison of the material parameters of the multi-point stamping method with and without ultrasonic vibration; the influence of different times on the results; the changes in parameters such as stress and strain at different frequencies; and the effect of its springback.

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Behrens, Bernd Arno, Kathrin Voges-Schwieger, Anas Bouguecha, Jens Mielke, and Milan Vucetic. "Material Characterization for Sheet-Bulk Metal Forming." Key Engineering Materials 504-506 (February 2012): 1029–34. http://dx.doi.org/10.4028/www.scientific.net/kem.504-506.1029.

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Sheet-bulk metal forming is a novel manufacturing technology, which unites the advantages and design solutions of sheet metal and bulk metal forming. To challenge the high forming force the process is superimposed with an oscillation in the main flow of the process. The paper focuses on the characterization of the material behavior under cyclic load and the effects for the sheet bulk metal forming process.

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Khan, Zarak, Mushtaq Khan, Syed Husain Imran Jaffery, Muhammad Younas, Kamran S. Afaq, and Muhammad Ali Khan. "Numerical and experimental investigation of the effect of process parameters on sheet deformation during the electromagnetic forming of AA6061-T6 alloy." Mechanical Sciences 11, no. 2 (October 7, 2020): 329–47. http://dx.doi.org/10.5194/ms-11-329-2020.

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Abstract. Electromagnetic forming is a high-speed sheet metal forming technique to form metallic sheets by applying magnetic forces. In comparison to the conventional sheet metal forming process, electromagnetic forming is a process with an extremely high velocity and strain rate, which can be effectively used for the forming of certain difficult-to-form metals. During electromagnetic forming, it is important to recognise the effects of process parameters on the deformation and sheet thickness variation of the sheet metal. This research focuses on the development of a numerical model for aluminium alloy (AA6061-T6) to analyse the effects of three process parameters, namely voltage, sheet thickness and number turns of the coils, on the deformation and thickness variation of the sheet. A two-dimensional fully coupled finite-element (FE) model consisting of an electrical circuit, magnetic field and solid mechanics was developed and used to determine the effect of changing magnetic flux and system inductance on sheet deformation. Experiment validation of the results was performed on a 28 KJ electromagnetic forming system. The Taguchi orthogonal array approach was used for the design of experiments using the three input parameters (voltage, sheet thickness and number of turns of the coil). The maximum error between numerical and experimental values for sheet thickness variation was observed to be 4.9 %. Analysis of variance (ANOVA) was performed on the experimental results. Applied voltage and sheet thickness were the significant parameters, while the number of turns of the coil had an insignificant effect on sheet deformation. The contribution ratio of voltage and sheet thickness was 46.21 % and 45.12 % respectively. The sheet deformation from simulations was found to be in good agreement with the experimental results.

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Zhu, Hu, Wen Wen Lin, and Jin Lan Bai. "An Overview of the Sheet Metal CNC Incremental Forming Toolpath Generation." Advanced Materials Research 503-504 (April 2012): 35–39. http://dx.doi.org/10.4028/www.scientific.net/amr.503-504.35.

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The sheet metal CNC incremental forming is a flexible dieless forming technology that forms a sheet part by extruding the sheet metal point by point with the movement of forming tool along the forming path. The tool paths therefore have a great effect on the dimensional accuracy, surface quality and forming time. In this paper, an overview of the research status about the forming tool path generation for sheet metal CNC incremental forming is presented briefly.

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Cai, Zhong Yi, Zhi Qing Hu, Ying Wu Lan, and Ming Zhe Li. "Continuous Sheet Metal Forming - A Linearly Incremental Forming Method for Manufacturing 3D Surface Parts." Advanced Materials Research 486 (March 2012): 334–39. http://dx.doi.org/10.4028/www.scientific.net/amr.486.334.

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In order to manufacture a three dimensional sheet metal part effectively, a continuous sheet metal forming process (CSMF) based on flexible roll bending has been proposed and developed. This paper mainly focuses on the fundamental aspects of the process, the principle of CSMF is introduced and the method to estimate the downward displacement of upper roll based on the desired curvature of the deformed sheet metal is presented. The variation of the upper rolls downward displacement with the desired bend radius is shown in graphically. The smoothness of the CSMF parts was measured and analyzed. In the results, it is shown that a three-dimensional sheet metal part can be formed without defects and the formed surfaces are in good agreement with the target shapes.

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Opel, Simon, Thomas Schneider, and Marion Merklein. "Manufacturing of Geared Sheet Metal Components Using Flexible Rolled Tailored Blanks." Key Engineering Materials 554-557 (June 2013): 1459–70. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.1459.

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Manufacturing of functional sheet metal products with integrated gear teeth by form-ing can be realised with the application of bulk forming operations on sheet metals. Due to the desired part geometry simultaneous 2D and 3D stress and strain states occur during the forming operations. The main challenges of sheet-bulk metal form-ing are high resulting forming forces and the demand on a specific control of the material flow. In addition, there is a distinctive interaction between blank thickness and resulting part quality. To meet these challenges at high material efficiency, the application of tailored blanks with a defined sheet thickness distribution is a promising way. The process adapted semi-finished used in the presented work are formed by a flexible rolling process. First of all, the forming concept for the realization of geared sheet metal components using flexible rolled tailored blanks is presented. Afterwards, the developed rolling machine to produce rotational symmetric tailored blanks is shown, as well as the fundamental process influences during rolling. Based on that, the development of suitable process strategies to produce tailored blanks with a thickened sheet edge is presented. The further processing of those tailored blanks for the realization of external geared sheet metal components will show the advantages compared to the application of conventional sheet metals of constant sheet thickness. Therefore the concept of a combined deep drawing and ironing process is presented. The results show, that on the one hand the material efficiency is increased in comparison to the usage of conventional sheets of the same maximum thickness. On the other hand, the application of flexible rolled tailored blanks improves the accuracy of shape of the gear teeth. Both approaches prove that the application of flexible rolled is an appropriate procedure to enhance the limits of using conventional sheet metals within sheet-bulk metal forming.

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Galanulis, Konstantin. "Optical Measuring Technologies in Sheet Metal Processing." Advanced Materials Research 6-8 (May 2005): 19–34. http://dx.doi.org/10.4028/www.scientific.net/amr.6-8.19.

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During recent years, optical measuring technologies in sheet metal forming and tooling have been used more and more in the industry. Main applications are the digitizing of metal sheet parts and tools, forming analysis of metal sheets as well as the determination of material properties. Good interfaces to conventional CAD/CAM and numerical simulation systems made such optical measuring systems a part of complex process chains. These process chains mainly focus on optimizing the development of products and production processes and on improving the product quality. Using optical systems considerably decreases the development time for products and production while improving the quality.

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Zhou, Liu Ru. "Study of Sphere NC Sheet Metal Incremental Forming." Advanced Materials Research 239-242 (May 2011): 1036–39. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.1036.

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The principle of NC incremental sheet metal forming as well as the process planning, experiment of sphere forming are presented. Because the deformation of sheet metal only occurs around the tool head and the deformed region is subjected to shear deformation and thins, and surface area increases. Sheet metal forming stepwise is to lead to the whole sheet metal deformation. According to sine law, a sphere can’t be formed by NC incremental sheet metal forming process in a single process, rather, it must be formed in multi processes. Thus, the two time path process method is presented to form the sphere, and the experiment is made to verify it. A sphere can be formed from a sheet metal in NC incremental forming process by choosing appropriate tool-path planning. The fracture in the forming component can be avoided by these methods. A sphere of uniform wall-thickness can be formed from the truncated cone by NC incremental forming process.

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Tisza, Miklós. "Advanced Materials in Sheet Metal Forming." Key Engineering Materials 581 (October 2013): 137–42. http://dx.doi.org/10.4028/www.scientific.net/kem.581.137.

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In this paper, some recent developments in materials applied in sheet metal forming processes will be overviewed mainly from the viewpoint of automotive industry as one of the most important application fields. If we consider the main requirements in the automotive industry we can state that there are very contradictory demands on developments. Better performance with lower consumption and lower harmful emission, more safety and comfort are hardly available simultaneously with conventional materials and conventional manufacturing processes. These requirements are the main driving forces behind the material and technological developments in sheet metal forming: application of high strength steels, low weight light alloys and the appropriate non-conventional forming processes are the main target fields of developments summarized in this paper.

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KONDO, Kazuyoshi. "Extension to Sheet-Bulk Metal Forming." Journal of the Japan Society for Technology of Plasticity 51, no. 594 (2010): 627. http://dx.doi.org/10.9773/sosei.51.627.

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YAMANAKA, Akinori. "Multiscale Modelling of Sheet Metal Forming." Journal of the Japan Society for Technology of Plasticity 57, no. 662 (2016): 209–14. http://dx.doi.org/10.9773/sosei.57.209.

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Kulkarni, Manoj S., and Gajjal S Y. "Review of Sheet Metal Forming Analysis." International Journal of Mechanical Engineering 2, no. 1 (January 25, 2015): 1–4. http://dx.doi.org/10.14445/23488360/ijme-v2i1p101.

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Thimm, Georg, Wang Rui, and Ma Yongsheng. "Tolerance transfer in sheet metal forming." International Journal of Production Research 45, no. 14 (July 15, 2007): 3289–309. http://dx.doi.org/10.1080/00207540600789008.

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Keitmann-Curdes, Oliver, Christian Hansen, Patrick Knoll, Horst Meier, and Helmut Ermert. "Ultrasonic imaging of sheet metal forming." Ultrasonics 42, no. 1-9 (April 2004): 989–92. http://dx.doi.org/10.1016/j.ultras.2003.12.017.

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Hardt, David E. "Closed-Loop Sheet Metal Forming Processes." IFAC Proceedings Volumes 25, no. 28 (October 1992): 187–92. http://dx.doi.org/10.1016/s1474-6670(17)49490-0.

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Kirkhorn, L., K. Frogner, M. Andersson, and J. E. Ståhl. "Improved Tribotesting for Sheet Metal Forming." Procedia CIRP 3 (2012): 507–12. http://dx.doi.org/10.1016/j.procir.2012.07.087.

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Journal articles on the topic 'Sheet metal forming'

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