薄壁管材多斜辊等曲率矫直工艺方案与实现
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摘要
针对薄壁管材在连续矫直过程中矫直方案与等曲率矫直辊弯曲半径难以定量确定的实际问题。基于多斜辊统一矫直机理与薄壁管材弹复方程建立了等曲率矫直辊统一曲率半径的判断方法,提出了最小统一曲率半径的搜索方法,针对不同初始弯曲程度的薄壁管材给出了具体矫直方案,其中对于无法一次统一的具有大初始变形的管材提出了先预弯曲再统一后矫直的方法,确定了薄壁管材可矫直判断条件,采用VB开发程序通过算例证明了上述方法的有效性,发现了若针对某一初始弯曲半径的统一曲率半径存在则其并不唯一必在一定范围之内,同时发现初始曲率半径在一定范围内的管材无法应用二斜辊实现曲率统一。
Since it was difficult to setting the plan and the unifying curvature-radius precisely when the thin-walled tubes were straightened continuously by the rolls of equal curvature.Therefore,based on the mechanism of unifying-straightening for the multiple cross-rolls straightening machine,the judgment method of the unifying curvature-radius was presented firstly in view of the bending and springback equation of the thin-walled tube,and then the searching method of the minimum unifying curvature-radius was presented subsequently,finally the straightening plans were drawn up for different thin-walled tubes with different initial curvature radii,especially for the thin-walled tube with the large initial deformation which could not be unified by the two cross rolls,the new method was pre-bending,unifying,and straightening,and it was also presented whether a thin-walled tube could be straightened.Some procedures were developed by VB to calculate the example,which is shown that the methods are effective,meanwhile it is found that if the unifying curvature-radius exist for an initial curvature-radius,it will not be sole and will be within a scope,and it is also found that there must be a scope of the initial curvature-radius within which the thin-walled tubes can't be unified by the two cross rolls.
Since it was difficult to setting the plan and the unifying curvature-radius precisely when the thin-walled tubes were straightened continuously by the rolls of equal curvature.Therefore,based on the mechanism of unifying-straightening for the multiple cross-rolls straightening machine,the judgment method of the unifying curvature-radius was presented firstly in view of the bending and springback equation of the thin-walled tube,and then the searching method of the minimum unifying curvature-radius was presented subsequently,finally the straightening plans were drawn up for different thin-walled tubes with different initial curvature radii,especially for the thin-walled tube with the large initial deformation which could not be unified by the two cross rolls,the new method was pre-bending,unifying,and straightening,and it was also presented whether a thin-walled tube could be straightened.Some procedures were developed by VB to calculate the example,which is shown that the methods are effective,meanwhile it is found that if the unifying curvature-radius exist for an initial curvature-radius,it will not be sole and will be within a scope,and it is also found that there must be a scope of the initial curvature-radius within which the thin-walled tubes can't be unified by the two cross rolls.
引文
[1]Zhang Z Q.Prediction of maximum section flattening of thinwalled circular steel tube in continuous rotary straightening process[J].Journal of Iron and Steel Research International,2016,23(8):745.
[2]Zhang Z Q,Yan Y H,Yang H L.A simplified model of maximum cross-section flattening in continuous rotary straightening process of thin-walled circular steel tubes[J].Journal of Materials Processing Technology,2016,238:305.
[3]Zhai H.Research on straightening technology CAM system[J].Chinese Journal of Mechanical Engineering,2003,16(2):175.
[4]Chen M,Jiang X M,Zhao Z X.Innovation in the computing system of straightening force[J].Chinese Journal of Mechanical Engineering,2010,23(1):1.
[5]刘保平,薛艳杰,刘志亮.6+2钢管矫直机参数计算及仿真[J].钢铁研究学报,2015,27(2):31.(Liu B P,Xue Y J,Liu Z L.Simulation and parameter calculation of 6+2steel tube straightener[J].Journal of Iron and Steel Research,2015,27(2):31.)
[6]崔甫.矫直原理与矫直机械[M].北京:冶金工业出版社,2002.(Cui P.Straightening Theory and Straightening Machine[M].Beijing:Metallurgical Industry Press,2002.)
[7]Zhang Z Q,Yan Y H,Yang H L.A new stress mathematical model of deformation zone while straightening thin-walled tube[J].Advanced Materials Research,2013,652-654:1488.
[8]张子骞,颜云辉,杨会林.薄壁管材矫直曲率半径数学模型及其验证[J].机械工程学报,2013,39(22):17.(Zhang Z Q,Yan Y H,Yang H L.The straightening curvature-radius model for the thin-walled tube and it’s validation[J].Chinese Journal of Mechanical Engineering,2013,39(22):17.)
[9]Boria S,Pettinari S,Giannoni F.Theoretical analysis on the collapse mechanisms of thin-walled composite tubes[J].Composite Structures,2013,103:43.
[10]Arabzadeh H,Zeinoddini M.A closed-form solution for lateral indentation of pressurized pipes resting on a flexible bed[J].International Journal of Mechanical Sciences,2013,75:189.
[11]Ji L K,Zheng M,Chen H Y,et al.Apparent strain of a pipe at plastic bending buckling state[J].Journal of the Brazilian Society of Mechanical Sciences and Engineering,2015,37(6):1811.
[2]Zhang Z Q,Yan Y H,Yang H L.A simplified model of maximum cross-section flattening in continuous rotary straightening process of thin-walled circular steel tubes[J].Journal of Materials Processing Technology,2016,238:305.
[3]Zhai H.Research on straightening technology CAM system[J].Chinese Journal of Mechanical Engineering,2003,16(2):175.
[4]Chen M,Jiang X M,Zhao Z X.Innovation in the computing system of straightening force[J].Chinese Journal of Mechanical Engineering,2010,23(1):1.
[5]刘保平,薛艳杰,刘志亮.6+2钢管矫直机参数计算及仿真[J].钢铁研究学报,2015,27(2):31.(Liu B P,Xue Y J,Liu Z L.Simulation and parameter calculation of 6+2steel tube straightener[J].Journal of Iron and Steel Research,2015,27(2):31.)
[6]崔甫.矫直原理与矫直机械[M].北京:冶金工业出版社,2002.(Cui P.Straightening Theory and Straightening Machine[M].Beijing:Metallurgical Industry Press,2002.)
[7]Zhang Z Q,Yan Y H,Yang H L.A new stress mathematical model of deformation zone while straightening thin-walled tube[J].Advanced Materials Research,2013,652-654:1488.
[8]张子骞,颜云辉,杨会林.薄壁管材矫直曲率半径数学模型及其验证[J].机械工程学报,2013,39(22):17.(Zhang Z Q,Yan Y H,Yang H L.The straightening curvature-radius model for the thin-walled tube and it’s validation[J].Chinese Journal of Mechanical Engineering,2013,39(22):17.)
[9]Boria S,Pettinari S,Giannoni F.Theoretical analysis on the collapse mechanisms of thin-walled composite tubes[J].Composite Structures,2013,103:43.
[10]Arabzadeh H,Zeinoddini M.A closed-form solution for lateral indentation of pressurized pipes resting on a flexible bed[J].International Journal of Mechanical Sciences,2013,75:189.
[11]Ji L K,Zheng M,Chen H Y,et al.Apparent strain of a pipe at plastic bending buckling state[J].Journal of the Brazilian Society of Mechanical Sciences and Engineering,2015,37(6):1811.