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Öz

The springback is difference between the die geometry and bended sheet geometry. This phenomena is a general shaping problem in sheet metal forming. In V bending, the numerous factors such as material (material type, thickness, anisotropy, yield strength, Young’s modulus, strain hardening etc.), process (holding time, bending temperature, friction, bending force etc.) and die geometry (bending angle, bending radius etc.) must be considered. Therefore, numerous empirical and finite element analysis studies have been carried out by many researchers. In this study, the related studies with V bending operation has been compiled and revived

Anahtar Kelimeler

• Springback, V bending, bending dies

V BÜKMEDE GERİ ESNEME DAVRANIŞLARI

Öz

Geri esneme, ürüne kalıplama sırasında verilen şekil ile kalıplama sonrası elde edilen şekil arasındaki fark olup, genellikle sac metal bükme işlemlerinde karşılaşılan önemli bir şekil verme problemidir. V Bükmede, malzeme parametreleri (malzeme türü, kalınlık, anizotropi, akma dayanımı, Young modülü, pekleşme vb.), proses parametreleri (ütüleme süresi, bükme sıcaklığı, sürtünme, bükme kuvveti vb.) ve kalıp parametreleri (bükme açısı, bükme radyüsü vb.) gibi çok sayıda parametrenin dikkate alınması gerekmektedir. Bu nedenle; malzeme, proses ve kalıp parametrelerinin göz önünde bulundurulduğu çok sayıda deneysel ve sonlu elemanlar yöntemleriyle bilgisayar destekli sayısal analiz çalışmaları yapılmıştır. Bu çalışmada, V bükme sonrası şekillendirilen parçalarda meydana gelen geri esneme davranışları ile ilgili yapılmış olan çalışmalar derlenmiş ve değerlendirilmiştir.

Anahtar Kelimeler

• Geri esneme, V bükme, bükme kalıpları

Kaynakça

1. Zhang, L.C., Lu, G. and Leong, S.C., ‘‘V-shaped Sheet Forming by Deformable Punches’’, Journal ofMaterials Processing Technology, 63, 134-139, 1997.
2. Gisario, A., Barletta, M., Conti, C. and Guarino, S., ‘‘Springback Control in Sheet Metal Bending by Laser-Assisted Bending: Experimental Analysis, Empirical and Neural Network Modelling’’, Optics and Lasers in Engineering, 49, 1372–1383, 2011.
3. Naceur, H., Guo, Y.Q. and Ben-Elechi, S., ‘‘Response Surface Methodology for Design of sheet Forming Parameters to Control Springback Effects’’, Computers and Structures, 84, 1651– 1663, 2006.
4. Yang, X.A. and Ruan, F., ‘‘A Die Design Method For Displacement Adjustment’’, International Journal of Mechanical Sciences, 53, 399–406, 2011. on
5. Zhang, Q.F., Cai, Z.Y., Zhang, Y. and Li, M.Z., ‘‘Springback Compensation Method For Doubly Curved Plate in Multi-Point Forming’’, Materials and Design, 47, 377–385, 2013.
6. Zhao, J., Zhai, R., Qian, Z. and Ma, R., ‘‘A Study on Springback of Profile Planestretch–Bending in the Loading Method of Pretension and Moment’’, International Journal of Mechanical Sciences, 75, 45–54, 2013.
7. Chenga, H.S., Caoa, J. and Xia, Z.C., ‘‘An Accelerated Springback Compensation Method’’, International Journal of Mechanical Sciences, 49, 267–279, 2007.
8. Asnafi, N., ‘‘Springback and Fracture in V-Die Air Bending of Thick Stainlesssteel Sheets’’, Materials and Design, 21, 217-236, 2000.

9. Lim, H., Lee, M.G., Sung, J.H., Kim, J.H. and Wagoner, R.H., ‘‘Time-Dependent Springback of Advanced High Strength Steels’’, International Journal of Plasticity, 29, 42–59, 2012.
10. Yanagimoto, J. and Oyamada, K., ‘‘Mechanism of Springback-Free Bending of High-Strength Steel Sheets under Warm Forming Conditions’’, Institute of Industrial Science, 56, 265-268, 2007.
11. Wanga, L., Huanga, G., Zhanga, H., Wanga, Y. and Yina, L., ‘‘Evolution of Springback and Neutral Layer of AZ31B Magnesium Alloy V- Bending Under Warm Forming Conditions’’, Journal of Materials Processing Technology, 213, 844– 850, 2013.
12. Gau, J.T. and Kinzel, G.L., ‘‘A New Model For Springback Prediction in Which the Bauschinger Effect is Considered’’, International Journal of Mechanical Sciences, 43, 1813–1832, 2001.
13. Zhu, Y.X., Liu, Y.L., Yang, H. and Li, H.P., ‘‘Development and Application of the Material Constitutive Model in Springback Prediction of Cold-Bending’’, Materials and Design, 42, 245– 258, 2012.
14. Leu, D.K., ‘‘A Simplified Approach for Evaluating Bendability and Springback in Plastic Bending of Anisotropic Sheet Metals’’, Journal of Meterials Processing Technology, 66, 9-17, 1997.
15. Verma, R.K. and Haldar, A., ‘‘Effect of Normal Anisotropy on Springback’’, Journal of Materials Processing Technology, 190, 300–304, 2007.
16. Lana, F., Chena, J. and Linb, J., ‘‘A Method of Constructing Smooth Tool Surfaces for FE Prediction of Springback in Sheet Metal Forming’’, Journal of Materials Processing Technology, 177, 382–385, 2006.
17. Lia, X., Yanga, Y., Wanga, Y., Baoa, J. and Li. S., ‘‘Effect of the Material-Hardening Mode on the Springback Simulation Accuracy of V-Free Bending’’, Journal of Materials Processing Technology, 123, 209–211, 2002.
18. Nilsson, A., Melin. L. and Magnusson. C., ‘‘Finite- Element Simulation of V-Die Bending: A Comparison With Experimental Results’’, Journal of Materials Processing Technology, 65, 52 -58, 1997.
19. Esat, V. Darendeliler, H. ve Gokler, M.İ., ‘‘Finite Element Analysis of Springback in Bending of Aluminium Sheets’’, Materials and Design, 23, 223-229, 2002.
20. Panthi, S.K., Ramakrishnan, N., Ahmed, M., Singh, S.S. and Goel, M.D., ‘‘Finite Element Analysis of Sheet Metal Bending Process to Predict the Springback’’, Materials and Design, 31, 657– 662, 2010.
21. Panthi, S.K., Ramakrishnan, N., Pathak, K.K. and Chouhan, J.S., ‘‘An Analysis of Springback in Sheet Metal Bending Using Finite Element Method (FEM)’’, Journal of Materials Processing Technology, 186, 120–124, 2007.
22. Forcellese, A., Fratini, L., Gabrielli, F. and Micari, F., ‘‘The Evaluation of Springback in 3D Stamping and Coining Processes’’, Journal of Materials Processing Technology, 80–81, 108–112, 1998.
23. Toros, S., Polat, A. ve Ozturk, F., ‘‘Formability and Springback Characterization of TRIP800 Advanced High Strength Steel’’, Materials and Design, 41, 298–305, 2012.
24. Fei, F., Hodgson, P., ‘‘Experimental and Numerical Studies of Springback in Air V-Bending Process for Cold Rolled TRIP Steels’’, Nuclear Engineering and Design, 236, 1847–1851, 2006.