VC辊平整机板形调控性能的研究

Shape control properties of VC mills

以某厂连续退火平整机为研究对象,利用ANSYS有限元软件建立VC辊系静力学仿真模型,并研究了弯辊力、VC辊油压、轧辊辊径和辊套厚度对连续退火平整机板形控制能力的影响。结果表明,无论内、外弯辊如何配合,都不能达到只改变四次凸度的目的,不可能只通过内、外弯辊的配合来消除高次浪形;外弯辊的调控功效比内弯辊增大42%;VC辊油压的调控效果主要体现在二次凸度的改变上,改变油压后对四次凸度的影响不大;当VC辊承载时,油压不能始终保持辊套向外涨,承载时辊套可能发生反弯,向芯辊内凹陷;与大辊径相比,小辊径弯辊和油压的调控效果会增加,但辊缝横向刚度会降低;辊套壁厚的减小会使VC辊油压的调控能力有所提高。

In order to study VC mill shape control characteristics,a continuous annealing line of a certain factory was studied.ANSYS finite element software was used to build the simulation model of the static VC roll system,and the influence of such factors as roller diameter,roller thickness,bending force,and oil pressure on mill shape control ability was investigated.The results show that,no matter how the outside and inside bending rollers cooperate,it is impossible to achieve the goal of changing the fourth crown only and it is impossible to eliminate high-order shape wave.It is also found that,the outside bending rollers are more effective than the inside bending rollers in regulation;the regulation effect of the VC roll oil pressure is mainly found on the second crown while the effect on the fourth one is insignificant.When VC rollers are under load,the oil pressure cannot guarantee the constant outward rising of the roller shells which may bend towards the roller core.Compared with large-diameter rollers,small-diameter rollers with oil pressure have better regulation effect yet the horizontal stiffness of the rollers will decrease.The reduced wall thickness of the rollers will promote the hydraulic capacity of the rollers.