The Experts below are selected from a list of 15048 Experts worldwide ranked by ideXlab platform
M Y Demeri - One of the best experts on this subject based on the ideXlab platform.
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development of process control in Sheet Metal Forming
Journal of Materials Processing Technology, 2002Co-Authors: A G Ulsoy, M Y DemeriAbstract:Abstract In Sheet Metal Forming processes, the blank holder force controls the material flow into the die cavity, which is critical to producing a good part. Process control can be used to adjust the blank holder force in-process based on tracking a reference punch force trajectory to improve part quality and consistency. Key issues in process control include process controller and reference punch force trajectory design. The purpose of this paper is to present a systematic approach to the design and implementation of a suitable process controller and an optimal reference punch force trajectory. The approach includes modeling of the Sheet Metal Forming process, design of the process controller, and determination of the optimal punch force trajectory. Experimental results from U-channel Forming show that a suitable process controller can be designed through simulation and an optimal reference punch force trajectory can be synthesized through experiments. The proposed development should be useful in designing and implementing process control in Sheet Metal Forming processes.
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Process controller design for Sheet Metal Forming
Proceedings of the 1999 American Control Conference (Cat. No. 99CH36251), 1999Co-Authors: Cheng-wei Hsu, A G Ulsoy, M Y DemeriAbstract:In-process adjustment of the blank holder force can lead to higher formability and accuracy, and better part consistency. There are many studies on the application of process control to Sheet Metal Forming. However, process controller design has not been thoroughly addressed, and is studied in this paper. A constant gain proportional plus integral (PI) controller with approximate inverse dynamics is presented to achieve small tracking error regardless of model uncertainty and disturbances.
A. Erman Tekkaya - One of the best experts on this subject based on the ideXlab platform.
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Innovative Sheet Metal-Forming processes
International Journal of Mechatronics and Manufacturing Systems, 2008Co-Authors: A. Erman Tekkaya, Michael Trompeter, J. WitulskiAbstract:The paper gives an overview about current research activities at the Institute of Forming Technology and Lightweight Construction in the field of innovative Sheet Metal-Forming processes – hot Sheet Metal, electromagnetic, Sheet Metal hydro- and incremental Forming – regarding to realise lightweight constructions of modern Sheet Metal parts and flexible Forming processes.
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State-of-the-art of simulation of Sheet Metal Forming
Journal of Materials Processing Technology, 2000Co-Authors: A. Erman TekkayaAbstract:The paper starts with a brief historical overview to the attempts of numerical simulation of Sheet Metal Forming. Comparison between bulk and Sheet Metal Forming processes from the simulation point of view is given. Basic requirements of the applier to the simulation tools are summarized. Various possible methodologies are briefly discussed. Special emphasis is given to the static explicit and dynamic implicit finite element procedures. Also different element types are overviewed. Available important commercial finite element packages are given. The current state of the application of the simulation tools is discussed. Some typical industrial applications are reviewed to demonstrate the current abilities of analysis. Finally, an attempt to prognosticate some future developments is made.
Franc Kosel - One of the best experts on this subject based on the ideXlab platform.
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Water jet incremental Sheet Metal Forming: pressure distribution analysis
International Journal on Interactive Design and Manufacturing (IJIDeM), 2011Co-Authors: V. Sajn, B. Jurisevic, Franc KoselAbstract:Incremental Sheet Metal Forming (ISMF) is a very flexible technology for fast prototyping and small batch production of Sheet Metal parts. This contribution deals with an innovative variant of ISMF, where instead of a rigid tool a Water Jet (WJ) is used as the main tool. Such a process can be addressed as Water Jet Incremental Sheet Metal Forming (WJISMF). The main aim of this paper is to present the technological window for WJISMF and characterize the attributes of the WJ used as the main tool. A Finite Element Analysis (FEA) simulation of axis-symmetrical, incompressible, turbulent, free surface flow was developed to simulate the impact of a WJ on the impingement rigid surface. Measuring the surface pressure distribution at the interface between the WJ and the impingement rigid surface experimentally validated the FEA simulation. Calculated pressure distributions along the surface are in good agreement with those obtained experimentally.
Liuru Zhou - One of the best experts on this subject based on the ideXlab platform.
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Strain Analysis of NC Incremental Sheet Metal Forming
Advanced Materials Research, 2011Co-Authors: Liuru ZhouAbstract: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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Study of fender NC incremental Sheet Metal Forming
International Technology and Innovation Conference 2009 (ITIC 2009), 2009Co-Authors: Liuru ZhouAbstract:The principle of NC incremental Sheet Metal Forming and the Forming process of the fender are introduced. The effect of process parameters on Forming is analysed. The improvement method of the Forming quality is suggested. It is important that NC incremental Sheet Metal Forming technology is perfected. The NC incremental Sheet Metal Forming technology is a flexible Forming technology without dedicated Forming dies. The Forming locus of the Forming tool can be adjusted by correcting the numerical model of the product. Because the deformation of Sheet Metal only occurs around the tool head and the deformed region is subjected to stretch deformation, the deformed region of Sheet Metal thins, and surface area increases. Sheet Metal Forming stepwise is to lead to the whole Sheet Metal deformation. The Forming half-apex angle θ and feed pitch p are the main process parameters in NC incremental Forming of fender. According to sine law, it will succeed in fender incremental Forming in a single tool-path if the Forming is carried out with an angle which is larger than the Forming limit half-apex angle. In this study, we get the following result through calculation: θ=30°. The feed pitch p increase, the process time decrease, production rate and surface degree of roughness increase. In general, the feed pitch is 0.25mm.
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Study of fender NC incremental Sheet Metal Forming
International Technology and Innovation Conference 2009 (ITIC 2009), 2009Co-Authors: Liuru ZhouAbstract:The principle of NC incremental Sheet Metal Forming and the Forming process of the fender are introduced. The effect of process parameters on Forming is analysed. The improvement method of the Forming quality is suggested. It is important that NC incremental Sheet Metal Forming technology is perfected. The NC incremental Sheet Metal Forming technology is a flexible Forming technology without dedicated Forming dies. The Forming locus of the Forming tool can be adjusted by correcting the numerical model of the product. Because the deformation of Sheet Metal only occurs around the tool head and the deformed region is subjected to stretch deformation, the deformed region of Sheet Metal thins, and surface area increases. Sheet Metal Forming stepwise is to lead to the whole Sheet Metal deformation. The Forming half-apex angle thetas and feed pitch p are the main process parameters in NC incremental Forming of fender. According to sine law, it will succeed in fender incremental Forming in a single toolpath if the Forming is carried out with an angle which is larger than the Forming limit half-apex angle. In this study, we get the following result through calculation: thetas = 30°. The feed pitch p increase, the process time decrease, production rate and surface degree of roughness increase. In general, the feed pitch is 0.25 mm. (3 pages)
A G Ulsoy - One of the best experts on this subject based on the ideXlab platform.
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development of process control in Sheet Metal Forming
Journal of Materials Processing Technology, 2002Co-Authors: A G Ulsoy, M Y DemeriAbstract:Abstract In Sheet Metal Forming processes, the blank holder force controls the material flow into the die cavity, which is critical to producing a good part. Process control can be used to adjust the blank holder force in-process based on tracking a reference punch force trajectory to improve part quality and consistency. Key issues in process control include process controller and reference punch force trajectory design. The purpose of this paper is to present a systematic approach to the design and implementation of a suitable process controller and an optimal reference punch force trajectory. The approach includes modeling of the Sheet Metal Forming process, design of the process controller, and determination of the optimal punch force trajectory. Experimental results from U-channel Forming show that a suitable process controller can be designed through simulation and an optimal reference punch force trajectory can be synthesized through experiments. The proposed development should be useful in designing and implementing process control in Sheet Metal Forming processes.
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Process controller design for Sheet Metal Forming
Proceedings of the 1999 American Control Conference (Cat. No. 99CH36251), 1999Co-Authors: Cheng-wei Hsu, A G Ulsoy, M Y DemeriAbstract:In-process adjustment of the blank holder force can lead to higher formability and accuracy, and better part consistency. There are many studies on the application of process control to Sheet Metal Forming. However, process controller design has not been thoroughly addressed, and is studied in this paper. A constant gain proportional plus integral (PI) controller with approximate inverse dynamics is presented to achieve small tracking error regardless of model uncertainty and disturbances.