A Refined Model of Three-roller Elastoplastic Asymmetrical Pre-bending of Plate

• 作 者: Zhi-qiang ZHANG Jian-li SONG Jian-hua FU Yong-tang LI Yi-na GUO
• 机 构: School of Material Science and Engineering,Taiyuan University of Science and Technology,
• 出 处: Journal of Iron and Steel Research(International)
• 发表日期: 2014年03期
• 关键词: plate elastoplastic three-roller edge pre-bending asymmetrical bending springbac

The geometry of plate after edge pre-bending mode is compared with that after roll-bending mode and the relationship among edge pre-bending angle,pre-bending edge length,and cylindrical desired radius is presented for a three-roller plate bender with bottom rollers adjustable horizontally.The analytical moment-curvature model and springback model for pure bending are established,assuming that the stress-strain relationship of material is linear,and the material is in plain strain and yields according to Mises yield criterion.The mathematical model for threeroller edge pre-bending of plate is developed considering the effect of pre-bending edge length,bottom roller radius,friction between plate and roller,etc.The plate tensile test and plate bending test are done and the numerical results agree well with the test data.The results are shown graphically and analyzed in the following aspects:(1)the error between numerical results and test data of top roller force;(2)the influence of bottom roller radius,relative curvature,and bending arc length on springback angle;(3)the relationship between springback ratio and edge pre-bending angle.

The geometry of plate after edge pre-bending mode is compared with that after roll-bending mode and the relationship among edge pre-bending angle, pre-bending edge length, and cylindrical desired radius is presented for a three-roller plate bender with bottom rollers adjustable horizontally. The analytical moment-curvature model and springback model for pure bending are established, assuming that the stress-strain relationship of material is linear, and the material is in plain strain and yield according to Mises yield criterion. mathematical model for threeroller edge pre-bending of plate is developed considering the effect of pre-bending edge length, bottom roller radius, friction between plate and roller, etc. The plate tensile test and plate bending test are done and the numerical results agree well with the test data.The results are graphically and analyzed in the following aspects: (1) the error between numerical results and test data of top roller force; (2) the influence of bottom roller radius, relative curvature, and bending arc length on springback angle; (3) the relationship between springback ratio and edge pre-bending angle.