支承辊倒角对板形控制的研究
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摘要
支承辊倒角是板带轧制过程中常用于板形控制的一种方法,目前关于这方面研究的报道很少。通过简支梁模型以及有限元模型分析研究了宽度为400 mm的铜带轧制生产中支承辊倒角对轧制板带板形控制的影响。简支梁模型分析显示,若倒角后支承辊辊面长度大于板带宽度,则其长度越小,对板形控制越有利;有限元模型结果显示,倒角后支承辊辊面长度小于460 mm时,轧板肋部将产生应力集中,易出现肋浪缺陷。因此,倒角后支承辊辊面长度的设定应综合考虑支承辊倒角对板形控制的有利作用及倒角后支承辊辊面长度过小时造成轧板肋部出现应力集中的问题,取最优值。
In the strip rolling process,chamfer on backup rolls is often used for flatness control,while researches in this area are rarely reported. The effects of the chamfer of backup rolls on flatness of rolled strip control in the rolling of copper strip with 400 mm width were investigated via simple beam model and FEM model. The analysis result of simple beam model shows that the shorter the surface length of backup rolls after chamfer is,the better it is for the flatness control. The result of FEM model analysis shows that when the surface length of backup rolls after chamfer is less than 460 mm,the stress concentration will arise at the ribs of rolling plate,which easily leads to rib waves defect. So the advantage of chamfer on backup rolls on strip control and the stress concentration occurred at rolling rib owing to the undersized surface length of backup rolls after chamfer must be considered together when surface length of backup rolls after chamfer being set to seek the optimum value.
In the strip rolling process,chamfer on backup rolls is often used for flatness control,while researches in this area are rarely reported. The effects of the chamfer of backup rolls on flatness of rolled strip control in the rolling of copper strip with 400 mm width were investigated via simple beam model and FEM model. The analysis result of simple beam model shows that the shorter the surface length of backup rolls after chamfer is,the better it is for the flatness control. The result of FEM model analysis shows that when the surface length of backup rolls after chamfer is less than 460 mm,the stress concentration will arise at the ribs of rolling plate,which easily leads to rib waves defect. So the advantage of chamfer on backup rolls on strip control and the stress concentration occurred at rolling rib owing to the undersized surface length of backup rolls after chamfer must be considered together when surface length of backup rolls after chamfer being set to seek the optimum value.
引文
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[2]Le H R,Sutcliffe M P F.A robust model for rolling of thin strip and foil[J].International Journal of Mechanical Sciences,2001,(43):1405-1419.
[3]Kumar D,Dixit U S.A slab method study of strain hardening and friction effects in cold foil rolling process[J].Journal of Materials Processing Technology,2006,(171):331-340.
[4]Jiang Z Y.Finite element simulation of cold rolling of thin strip[J].Journal of Materials Processing Technology,2003,(140):542-547.
[5]王文明,梁涛.箔带轧制的三维接触有限元分析[J].机械科学与技术,2002,21(6):882-884.Wang Wenming,Liang Tao.Three-dimensional contact finite element analysis of foil strip rolling[J].Mechanical Science and Technology for Aerospace Engineering,2002,21(6):882-884.
[6]戴杰涛,张清东.冷轧薄板中浪板形缺陷的屈曲及后屈曲理论与轧制试验研究[J].机械工程学报,2011,47(2):44-50.Dai Jietao,Zhang Qingdong.Analysis and experiment on central buckling and post buckling of thin cold-rolled sheet[J].Chinese Journal of Mechanical Engineering,2011,47(2):44-50.
[7]龚寄,王艾伦,骆拓.四辊轧机有载辊缝解析模型研究[J].中国机械工程,2007,18(22):2752-2756.Gong Ji,Wang Ailun,Luo Tuo.Study on modeling of the roll gap with load for 4-h mill[J].China Mechanical Engineering,2007,18(22):2752-2756.
[8]时旭,刘相华,王国栋,等.弯辊力对带钢凸度影响的有限元分析[J].轧钢,2006,23(3):10-13.Shi Xu,Liu Xianghua,Wang Guodong,et al.FEM analysis of effect of bending force on the crown of strip[J].Steeling Rolling,2006,23(3):10-13.
[9]董丽丽,邢淑清,姜晓艳,等.张力对冷轧304奥氏体不锈钢薄板板形影响的数值模拟[J].特殊钢,2012,33(3):4-7.Dong Lili,Xing Shuqing,Jiang Xiaoyan,et al.Numerical simulation of effect of tension on profile shape of cold rolled 304 austenite stainless steel strip[J].Special Steel,2012,33(3):4-7.
[10]冯少鹏,陈林,王仁忠,等.六辊铝板带冷轧机轧辊倒角仿真分析及工艺优化[J].锻压技术,2011,36(7):38-42.Feng Shaopeng,Chen Lin,Wang Renzhong,et al.Simulating analysis and technological optimization of roll angle beveling on sixhigh aluminum strip cold rolling mill[J].Forging&Stamping Technology,2011,36(7):38-42.
[11]李智军,王少鹏.轧辊参数对铝合金薄板冷轧过程应力应变的影响[J].重型机械,2012,(3):95-98.Li Zhijun,Wang Shaopeng.Influence of roller parameters on stress and strain of aluminum alloy thin plate in cold rolling process[J].Heavy Machinery,2012,(3):95-98.
[12]刘华,杨荃,何安瑞.铝箔轧制中辊端压靠的有限元分析[J].塑性工程学报,2005,12(5):78-81.Liu Hua,Yang Quan,He Anrui.FEM analysis of forced-contact between two roll ends during aluminum foil rolling[J].Journal of Plasticity Engineering,2005,12(5):78-81.