高强钢筋矫直系统多辊止转筋技术
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摘要
为有效提高高强钢筋辊式矫直精度,基于楔钳作用机理提出一种多段变形、统一曲率多辊止转筋机构,即两侧上辊分别压下,针对不同直径高强钢筋,形成与之匹配的大变形曲率,并处于楔钳夹持状态,保证后续矫直过程的止转筋。在对高强钢筋应力应变分析的基础上,采用工程弹塑性力学基本理论,推导钢筋弹复扭矩方程,结合止转辊系力学模型,建立止转筋变形协调方程,确立钢筋止转条件;应用ANSYS/LS-DYNA对止转筋机构工作过程进行有限元模拟,并对钢筋转动角度随时间变化规律、接触应力状态进行探究。仿真与试验结果表明,该机构在保证接触强度的条件下,能实现高强钢筋矫直过程,并有效提高矫直精度,可为实际生产提供指导。
In order to improve the straightening quality of high strength steel bars,a roller standstill locking mechanism with multi-section deformation and uniform curvature was proposed based on wedge clamp mechanism.On both sides,two upper rollers pressed on the bars respectively,which formed the matched large deformation curvature according to different diameter high strength steel bars.In the wedge clamp state,the standstill locking of reinforcing steel bars in the subsequent straightening process was guaranteed.Based on the analysis of the stress and strain of the high strength steel bars,the elastic recovery torque equation was deduced in reinforcing steel elastic recovery process using engineering elastic-plastic mechanics.The deformation coordinate equation of the reinforcing bars was established combined with standstill locking roller mechanical model,and the standstill locking condition of reinforcing bars was established.Based on ANSYS/LS-DYNA,the working process of the standstill locking mechanism was simulated by finite element method.The rotation angle variation charts of bars,the contact stress state as well as its distortion chart were explored.Test results show that the mechanism could realize the standstill locking of high strength steel bars during straightening and effectively improve the straightening precision under the condition of ensuring the surface contact strength.The work has laid foundation for high precision straightening,and the analysis results can provide guidance for the practical production.
In order to improve the straightening quality of high strength steel bars,a roller standstill locking mechanism with multi-section deformation and uniform curvature was proposed based on wedge clamp mechanism.On both sides,two upper rollers pressed on the bars respectively,which formed the matched large deformation curvature according to different diameter high strength steel bars.In the wedge clamp state,the standstill locking of reinforcing steel bars in the subsequent straightening process was guaranteed.Based on the analysis of the stress and strain of the high strength steel bars,the elastic recovery torque equation was deduced in reinforcing steel elastic recovery process using engineering elastic-plastic mechanics.The deformation coordinate equation of the reinforcing bars was established combined with standstill locking roller mechanical model,and the standstill locking condition of reinforcing bars was established.Based on ANSYS/LS-DYNA,the working process of the standstill locking mechanism was simulated by finite element method.The rotation angle variation charts of bars,the contact stress state as well as its distortion chart were explored.Test results show that the mechanism could realize the standstill locking of high strength steel bars during straightening and effectively improve the straightening precision under the condition of ensuring the surface contact strength.The work has laid foundation for high precision straightening,and the analysis results can provide guidance for the practical production.
引文
[1]易伟建,潘柏荣,吕艳梅.HRB500级钢筋配箍的混凝土梁受剪性能试验研究[J].土木工程学报,2012.45(4):56-62
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[8]Hamada Ryota,Asakawa Motoo,Irisawa Shinnosuke,et al.Experimental and numerical analysis of roller leveler straightening for coiled bar and wire[J].Journal of the Iron and Steel Institute of Japan,2009.95(11):780-787
[9]Yi Yali,Jin Herong.Three roller curvature scotch straightening mechanism study and system design[J].Energy Procedia,2012.(16):38-44
[10]崔甫.矫直原理与矫直机械(第2版)[M].北京:冶金工业出版社,2007
[2]Sumpter M S,Rizkalla S H,Zia P.Behavior of highperformance steel as shear reinforcement for concrete beams[J].ACI Structural Journal,2009.106(2):171-177
[3]曲恩,周玉林.转毂钢球式钢筋矫直切断机的设计研究[J].钢铁,2006.41(5):61-64
[4]杜晓钟,孙斌煜,张芳萍.冷轧带肋钢筋矫直剪断机的应用分析[J].机械工程与自动化,2006.(3):83-88
[5]薛军安,胡贤磊,刘相华等.辊式矫直过程弹塑性弯曲数学模型[J].钢铁研究学报,2008.20(11):33-36
[6]王树环,王效岗,谢仕鸿等.辊式矫直机矫直扭矩计算方法研究[J].中国重型装备,2011.(1):1-9
[7]薛军安,崔丽,胡贤磊等.辊式矫直过程的接触倾角与曲率耦合分析[J].中国冶金,2009.19(2):23-26
[8]Hamada Ryota,Asakawa Motoo,Irisawa Shinnosuke,et al.Experimental and numerical analysis of roller leveler straightening for coiled bar and wire[J].Journal of the Iron and Steel Institute of Japan,2009.95(11):780-787
[9]Yi Yali,Jin Herong.Three roller curvature scotch straightening mechanism study and system design[J].Energy Procedia,2012.(16):38-44
[10]崔甫.矫直原理与矫直机械(第2版)[M].北京:冶金工业出版社,2007