The Experts below are selected from a list of 6189 Experts worldwide ranked by ideXlab platform
Taylan Altan - One of the best experts on this subject based on the ideXlab platform.
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Tube and Sheet Hydroforming-Advances in Material Modeling, Tooling and Process Simulation
Advanced Materials Research, 2005Co-Authors: Taylan Altan, Hariharasudhan Palaniswamy, G. AmbrogioAbstract:Tube Hydroforming is a well accepted production technology in automotive industry while sheet Hydroforming is used in selected cases for prototyping and low volume production. Research in advanced methods (warm sheet and tube Hydroforming, double blank sheet Hydroforming, combination of Hydroforming and mechanical sizing, use of multi-point and elastic blank holders) is expanding the capabilities of Hydroforming technologies to produce parts from Al and Mg alloys, as well as Ultra High Strength Steels. In the development of advanced Hydroforming methods, experience based knowledge is not readily available. Thus, robust process simulation is required, along with adequate material modeling and identification of friction coefficients as input to process simulation. This paper gives an overview of advanced Hydroforming methods, including examples of novel machine and tooling designs. The use of reliable process simulation is illustrated with examples that demonstrate the significance of material and friction date for making accurate predictions. Advanced simulation methods for warm forming and for programming multiple-point blank holder are also discussed. This review illustrates that Hydroforming continues to make advances and has the potential to make many contributions to production technology in the near future.
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Hydroforming of y shapes product and process design using fea simulation and experiments
Journal of Materials Processing Technology, 2004Co-Authors: Suwat Jirathearanat, Christoph Hartl, Taylan AltanAbstract:Abstract Exhaust system components such as 3-way connectors (Y-shapes) are often manufactured by tube Hydroforming. Compared to stamping, tube Hydroforming offers higher part quality (tighter tolerances, increased rigidity) with lower manufacturing costs (reduced number of forming and assembly operations). In this study, the estimation of the process parameters for Hydroforming Y-shapes, i.e. pressure levels, axial feeds, and initial tube length, are discussed. These estimated parameters are then “optimized” through conducting FEA simulations and verified with Hydroforming experiments. A geometric parameter that is of importance is the tube length, which affects formability of the protrusion. Y-shape Hydroforming experiments were conducted to investigate this effect. As expected, Y-shapes with shorter length formed a longer protrusion with the same axial feeds applied.
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Overall review of the tube Hydroforming (THF) technology
Journal of Materials Processing Technology, 2001Co-Authors: Muammer Koç, Taylan AltanAbstract:Tube Hydroforming is used to describe the metal forming process whereby tubes are formed into complex shapes with a die cavity using internal pressure which is usually obtained by various means such as hydraulic, viscous medium, elastomers, polyurethanes and axial compressive forces simultaneously. Increasing use of Hydroforming in automotive applications requires intensive research and development on all aspects of this new technology to satisfy an ever-increasing demand by the industry. A technological review of Hydroforming process from its early years to very recent dates on various topics such as material, tribology, equipment, tooling are summarizes.
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tube Hydroforming current research applications and need for training
Journal of Materials Processing Technology, 2000Co-Authors: Mustafa A Ahmetoglu, K Sutter, X J Li, Taylan AltanAbstract:Abstract Tube Hydroforming is a relatively new technology compared to conventional stamping. Thus, there is no large “knowledge base” that can be utilized for process and die design. To remedy this situation, considerable research is now being conducted by various institutions on significant aspects of tube Hydroforming technology, including material selection, friction, pre-form design, Hydroforming process and tool design, die materials and coatings. ERC/NSM is also conducting R&D in tube Hydroforming in association with its industrial partners. This paper summarizes some of the early results in Hydroforming of low carbon steel and aluminum alloy 6061-T9 tubes.
Kristoffer Trana - One of the best experts on this subject based on the ideXlab platform.
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finite element simulation of the tube Hydroforming process bending preforming and Hydroforming
Journal of Materials Processing Technology, 2002Co-Authors: Kristoffer TranaAbstract:Abstract This paper covers finite element simulations of the complete Hydroforming process for the lower part of an A-pillar for a car. Simulations were carried out for the bending, preforming and Hydroforming process using the MPP-version of the explicit code LS-DYNA. The study focuses on the development of a practical simulation procedure for the entire Hydroforming process and how the bending and preforming operation influence the Hydroforming result. The simulation results were also compared with experimental results with respect to the thickness distribution and the agreement proved to be good. The study shows the importance of the bending operation and that it is necessary to take it into account when performing Hydroforming simulations. It also indicates that processes with multiple forming operations can be simulated with good accuracy.
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Finite element simulation of the tube Hydroforming process—bending, preforming and Hydroforming
Journal of Materials Processing Technology, 2002Co-Authors: Kristoffer TranaAbstract:Abstract This paper covers finite element simulations of the complete Hydroforming process for the lower part of an A-pillar for a car. Simulations were carried out for the bending, preforming and Hydroforming process using the MPP-version of the explicit code LS-DYNA. The study focuses on the development of a practical simulation procedure for the entire Hydroforming process and how the bending and preforming operation influence the Hydroforming result. The simulation results were also compared with experimental results with respect to the thickness distribution and the agreement proved to be good. The study shows the importance of the bending operation and that it is necessary to take it into account when performing Hydroforming simulations. It also indicates that processes with multiple forming operations can be simulated with good accuracy.
Beomsoo Kang - One of the best experts on this subject based on the ideXlab platform.
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a comparative study of stamping and Hydroforming processes for an automobile fuel tank using fem
International Journal of Machine Tools & Manufacture, 2004Co-Authors: Beomsoo KangAbstract:The use of sheet metal in the Hydroforming process for hollow bodies is a new manufacturing technology for the automotive industry. In this paper, a comparison is made between the forming processes of sheet Hydroforming and conventional stamping for production of an automobile fuel tank using a commercial explicit FEM code. A modeling methodology for correlation between stamping and Hydroforming is proposed in order to obtain the optimal process parameters for producing a sound hydroformed fuel tank. The simulation model for a conventional stamping process is also verified by comparison with experiment. Finally, it is concluded that the Hydroforming process can produce a fuel tank with a more uniform and sound thickness distribution than the stamping operation.
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Preform design in Hydroforming of automobile lower arm by FEM
Journal of Materials Processing Technology, 2003Co-Authors: Beomsoo KangAbstract:Abstract By using a three-dimensional finite element program HydroFORM-3D based on a rigid–plastic model, the Hydroforming process for automobile lower arm is analyzed in this study. The goal of the study is to accomplish proper design and control of processes for producing hydroformed lower arm component most soundly. Prior to Hydroforming, the tube must be bent to the approximate centerline of the finished part to enable the tube to be placed in the die cavity. After then, a preforming operation is carried out to the pre-bent tube. Finally, the Hydroforming operation is performed to the preformed tube to get the final production. The influences of forming conditions, such as the loading path of the hydraulic pressure and the axial feeding, on the Hydroforming process is discussed.
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Computational approach to analysis and design of Hydroforming process for an automobile lower arm
Computers & Structures, 2002Co-Authors: Sung-jong Kang, Beomsoo KangAbstract:Tubular Hydroforming has attracted increased attention in the automotive industry recently. In this study, a professional finite element program for analysis and design of tube Hydroforming processes has been developed, called HydroFORM-3D, which is based on a rigid-plastic model. The friction calculation between die and workpiece has been dealt with carefully by introducing a new scheme in three-dimensional surface integration. With the developed program, HydroFORM-3D, the Hydroforming process for an automobile lower arm is analyzed and designed. The manufacturing process for a lower arm consists of tube bending, preforming, and final Hydroforming. To accomplish successful Hydroforming process design, thorough investigation on proper combination of process parameters such as internal hydraulic pressure, axial feeding, and tool geometry is required. This paper includes the study on the influences of the forming conditions on the Hydroforming of a lower arm by using simulation to predict strain and tube shape during bending, preforming, and final Hydroforming processes.
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manufacture of an automobile lower arm by Hydroforming
International Journal of Machine Tools & Manufacture, 2002Co-Authors: Sangmoon Hwang, Sung-jong Kang, Beomsoo KangAbstract:Abstract An automobile lower arm has been fabricated in a prototype form by Hydroforming with the aids of numerical analysis and experiments. For the numerical process design, a program called HydroFORM-3D developed here on the basis of a rigid–plastic model, has been applied to the lower arm Hydroforming. The friction calculation between die and workpiece has been dealt with carefully by introducing a new scheme in three-dimensional surface integration. To accomplish successful Hydroforming process design, thorough investigation on the proper combination of process parameters such as internal hydraulic pressure, axial feeding and tool geometry has been performed. Results obtained from numerical simulation for a lower arm in the Hydroforming process are compared with a series of experiments. The comparison shows that the numerical analysis successfully provides the manufacturing information on the lower arm Hydroforming, and it predicts the geometrical deformation and the thinning.
Shi-hong Zhang - One of the best experts on this subject based on the ideXlab platform.
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Hydroforming highlights sheet Hydroforming and tube Hydroforming
Journal of Materials Processing Technology, 2004Co-Authors: Li Hui Lang, Joachim Danckert, D.c. Kang, Shi-hong Zhang, S. J. Yuan, Z R Wang, Karl Brian NielsenAbstract:Abstract At the present time, Hydroforming technology is used widely for forming lightweight or complicated components in the automotive industry and aerospace industry, etc. Recent developments and the character of Hydroforming, especially sheet Hydroforming and tube Hydroforming, also known by the name of internal high pressure forming, are discussed in detail. Based on applications and by using liquid as a forming media, the state of the art and key technologies concerned with equipment, process control, simulation, etc. are explored in detail. Conclusions are drawn concerning possible future developments in Hydroforming technology.
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Hydroforming highlights: Sheet Hydroforming and tube Hydroforming
Journal of Materials Processing Technology, 2004Co-Authors: Li Hui Lang, Joachim Danckert, D.c. Kang, Shi-hong Zhang, S. J. Yuan, Karl Brian NielsenAbstract:At the present time, Hydroforming technology is used widely for forming lightweight or complicated components in the automotive industry and aerospace industry, etc. Recent developments and the character of Hydroforming, especially sheet Hydroforming and tube Hydroforming, also known by the name of internal high pressure forming, are discussed in detail. Based on applications and by using liquid as a forming media, the state of the art and key technologies concerned with equipment, process control, simulation, etc. are explored in detail. Conclusions are drawn concerning possible future developments in Hydroforming technology. © 2004 Elsevier B.V. All rights reserved.
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Recent developments in sheet Hydroforming technology
Journal of Materials Processing Technology, 2004Co-Authors: Shi-hong Zhang, Yong Chao Xu, L X ZhouAbstract:In this paper, recent developments in sheet Hydroforming technology are summarized, several key technical problems to be solved for the development of sheet Hydroforming technology are analyzed, and varied sheet Hydroforming technologies are discussed. Compound deformation by drawing and bulging is the main direction for the development of sheet Hydroforming technology, in which it is advantageous to increase the feeding of materials, and the ratio of drawing deformation (drawing in of the blank flange) to bulging, enabling the forming limit of a sheet blank to be increased. It is also advantageous to increase the local deformation capacity for sheet Hydroforming, to increase the range of application of the process. Press capacity is one of the important factors restraining the range of applications. As one of the flexible forming technologies that is still under development, it has much potential for innovative applications. Its applications have been increasing remarkably, recently in automotive companies. A breakthrough in the technology will be obtained by the development of novel equipment. A new sheet Hydroforming technology using a movable die is proposed in this paper, which has been developed recently by the authors. ?? 2004 Elsevier B.V. All rights reserved.
Linjiong Zhou - One of the best experts on this subject based on the ideXlab platform.
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recent developments in sheet Hydroforming technology
Journal of Materials Processing Technology, 2004Co-Authors: Shuquan Zhang, Z R Wang, Yunxiao Xu, Zhishuai Wang, Linjiong ZhouAbstract:Abstract In this paper, recent developments in sheet Hydroforming technology are summarized, several key technical problems to be solved for the development of sheet Hydroforming technology are analyzed, and varied sheet Hydroforming technologies are discussed. Compound deformation by drawing and bulging is the main direction for the development of sheet Hydroforming technology, in which it is advantageous to increase the feeding of materials, and the ratio of drawing deformation (drawing in of the blank flange) to bulging, enabling the forming limit of a sheet blank to be increased. It is also advantageous to increase the local deformation capacity for sheet Hydroforming, to increase the range of application of the process. Press capacity is one of the important factors restraining the range of applications. As one of the flexible forming technologies that is still under development, it has much potential for innovative applications. Its applications have been increasing remarkably, recently in automotive companies. A breakthrough in the technology will be obtained by the development of novel equipment. A new sheet Hydroforming technology using a movable die is proposed in this paper, which has been developed recently by the authors.
