|
By setting different technological conditions, such as flange height, flange forming radius, sheet thickness and material property, the flexible roll-forming FE model was built to simulate the springback phenomenon of the flange, and some experimental tests were carried out. The results demonstrate that the flange height, which is not easy to be interfered, plays a dominate roll in flange springback of flexible roll-forming. The flange forming radius also has a strong influence on the flange springback, but weaker than the flange height. Compared with flange height and flange forming radius, sheet thickness and material property have much less effect on flange springback angle. During flexible roll-forming, the flange height suffers a greater deformation in forming direction compared with conventional roll-forming, and then serious longitudinal residual stress is created. In this way, serious springback in the flexible flange is caused.
|
|
［1］Groche P, Zettler A, Berner S, et al. Development and verification of a one-step-model for the design of flexible roll formed parts[J]. Journal of Materials Processing Technology, 2011, 4: 371-377.
［2］钱波，李强，黄志高. 柔性辊弯成型可变时域离散插补控制[J].华中科技大学学报:自然科学版，2011， 39(12):37-40.Qian B, Li Q, Huang Z G. Control of discrete interpolation with variable time domain in flexible roll forming[J]. Journal of Huazhong University of Science and Technology:Natural Science Edition, 2011, 39(12):37-40.
［3］Allwood J M, Utsunomiya H. A survey of flexible forming processes in Japan[J]. International Journal of Machine Tools and Manufacture, 2006, 46(15): 1939-1960.
［4］龙睿芬， 韩飞，刘继英. 基于RIK硬化模型的柔性辊弯成形仿真研究[J].锻压技术，2011，36(4):
44-50.Long R F, Han F, Liu J Y. Research on simulation of flexible roll-forming based on RIK hardening model[J]. Forging & Stamping Technology, 2011, 36(4): 44-50.
［5］Groche P, Beiter P, Henkelmann M. Prediction and inline compensation of springback in roll forming of high and ultra-high strength steels[J]. Production Engineering, 2008, 2(4): 401-407.
［6］Larraaga J, Galdos L, Uncilla1 L, et al. Development and validation of a numerical model for sheet metal roll forming[J]. International Journal of Material Forming, 2010, 3(S1): 151-154.
［7］罗晓亮，曾国，李淑慧，等. 材料参数对高强钢辊弯成形边波影响的有限元分析[J]. 上海交通大学学报，2008，42(5): 744-747.Luo X L, Zeng G, Li S H, et al. Finite element analysis of the effect of material properties on wavy flange in high strength steel roll forming[J]. Journal of Shanghai Jiaotong University, 2008, 42(5): 744-747.
［8］崔高健，陈嘉鹏. 各向异性屈服准则对不锈钢板冷弯成型回弹模拟的影响[J]. 塑性工程学报，2008，15(5): 87-90.Cui G J, Chen J P. Effects of anisotropic yield criteria on the spring-backs FEM simulating of stainless steel sheets cold-roll forming process[J]. Journal of Plasticity Engineering, 2008, 15(5): 87-90.
［9］Liu W J, Liu Q, Ruan F, et al. Springback prediction for sheet metal forming based on GA-ANN technology[J]. Journal of Materials Processing Technology, 2007, 187-188: 227-231.
［10］Panthi S K, Ramakrishnan N, Ahmed J, et al. Finite element analysis of sheet metal bending process to predict the springback[J]. Materials & Design, 2010, 31(2): 657-662.
［11］Song Y T, Yao D M, Wu S T, et al. Spring-back simulation of sheet metal forming for the HT-7U vacuum vessel[J]. Fusion Engineering and Design, 2003, 69(1-4): 361-365.
［12］Bui Q V, Ponthot J P. Numerical simulation of cold roll-forming processes[J]. Journal of Materials Processing Technology, 2008, 202(1-3): 275-282.
［13］ Cai Z Y, Li M Z, Lan Y W. Three-dimensional sheet metal continuous forming process based on flexible roll bending: Principle and experiments[J]. Journal of Materials Processing Technology, 2012, 212(1): 120-127.
［14］Paralikas J, Salonitis K, Chryssolouris G. Investigation of the effects of main roll-forming process parameters on quality for a V-section profile from AHSS[J]. The International Journal of Advanced Manufacturing Technology, 2008, 44(3-4): 223-237.
［15］李大永，罗应兵，彭颖红，等. 实体壳单元及其在动力显式有限元方法中的应用[J]. 上海交通大学学报，2006，40(10): 1663-1666.Li D Y, Luo Y B, Peng Y H, et al. The solid shell element and its application in the dynamic explicit finite element method[J]. Journal of Shanghai Jiaotong University, 2006, 40(10): 1663-1666.
［16］曾国，来新民，于忠奇，等. 多道次辊弯成形动力显式仿真的虚拟速度[J]. 上海交通大学学报， 2008，42(9): 1429-1432.Zeng G, Lai X M, Yu Z Q, et al. The virtual speed in dynamic explicit FEM simulation for multi-stand roll forming[J]. Journal of Shanghai Jiaotong University, 2008, 42(9): 1429-1432.
|
Copyright Forging & Stamping Technology.All rights reserved