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http://dx.doi.org/10.5228/KSTP.2012.21.8.479

Compensation for Elastic Recovery in a Flexible Forming Process Using Predictive Models for Shape Error  

Seo, Y.H. (Department of Aerospace Engineering, Pusan National University)
Kang, B.S. (Department of Aerospace Engineering, Pusan National University)
Kim, J. (Department of Aerospace Engineering, Pusan National University)
Publication Information
Transactions of Materials Processing / v.21, no.8, 2012 , pp. 479-484 More about this Journal
Abstract
The objective of this study is to compensate the elastic recovery in the flexible forming process using the predictive models. The target shape was limited to two-dimensional shape having only one curvature radius in the longitudinal-direction. In order to predict the shape error the regression and neural network models were established based on the finite element (FE) simulations. A series of simulations were conducted considering input variables such as the elastic pad thickness, the thickness of plate, and the objective curvature radius. Then, at sampling points in the longitudinal-direction, the shape errors between formed and objective shapes could be calculated from the FE simulations as an output variable. These shape errors were expressed to a representative error value by the root mean square error (RMSE). To obtain the correct objective shape the die shape was adjusted by the closed-loop using the neural network model since the neural network model shows a higher capability of estimating the shape error than the regression model. Finally the experimental result shows that the formed shape almost agreed with the objective shape.
Keywords
Elastic Recovery Compensation; Flexible Forming; Neural Network; Finite Element Simulation; Shape Error;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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1 M. Samuel, 2000, Experimental and Numerical Prediction of Springback and Side Wall Curl in Ubendings of Anisotropic Sheet Metals, J. Mater. Process. Technol., Vol. 105, No. 3, pp. 382-393.   DOI
2 W. D. Carden, L. M. Geng, D. K. Matlock, R. H. Wagoner, 2002, Measurement of Springback, Int. J. Mech. Sci., Vol. 44, No. 1, pp. 79-101.   DOI
3 H. S. Cheng, J. Cao, Z. C. Xia, 2007, An Accelerated Springback Compensation Method, Int. J. Mech. Sci., Vol. 49, No. 3, pp. 267-279.   DOI
4 R. D. Webb, D. E. Hardt, 1991, A Transfer Function Description of Sheet Metal Forming for Process Control, Trans. ASME, Vol. 113, No. 1, pp. 44-52.
5 A. P. Karafillis, M. C. Boyce, 1995, Tooling and Binder Design for Sheet Metal Forming Processes Compensating Springback Error, Int. J. Mach. Tool. Manufac., Vol. 36, No. 4, pp. 503-526.
6 A. P. Karafillis, M. C. Boyce, 1992, Tooling Design in Sheet Metal Forming using Springback Calculations, Int. J. Mech. Sci., Vol. 34, No. 2, pp. 113-131.   DOI
7 W. Gan, R. H. Wagoner, 2004, Die Design Method for Sheet Springback, Int. J. Mech. Sci. Vol. 46, No. 7, pp. 1097-1113.   DOI
8 Y. H. Seo, S. C. Heo, T. W. Ku, J. Kim, B. S. Kang, 2011, Design of Flexible Die Punch and Control System for Three-dimensional Curved Forming Surface, Trans. Mater. Process., Vol. 20, No. 3, pp. 204-211.   과학기술학회마을   DOI
9 Y. H. Seo, S. C. Heo, B. S. Kang, J. Kim, 2011, Statistical Study on Correlation Between Design Variable and Shape Error in Flexible Stretch Forming, Trans. Mater. Process., Vol. 20, No. 2, pp. 124-131.   과학기술학회마을   DOI
10 Y. H. Seo, S. C. Heo, W. J. Song, J. Kim, B. S. Kang, 2010, Tendency Analysis of Shape Error According to Forming Parameter in Flexible Stretch Forming Process Using Finite Element Method, Trans. Mater. Process., Vol. 19, No. 8, pp. 1-8.   과학기술학회마을   DOI   ScienceOn