20辊轧机轧制宽幅工业纯钛带的变形行为研究

Modeling and Simulation of Wide Commercial Pure Titanium Strip Rolling on Sendzimir 20-high Mill

摘要:

国内某厂森吉米尔20辊轧机在轧制宽幅工业纯钛带时二肋浪形问题频繁发生且不易调控,为了掌握现有板形调控手段的调控规律,以期达到提供合理调控策略来解决二肋浪形问题的目的,基于ABAQUS有限元软件,考虑了钛金属的各向异性力学特点,建立了可实现工作辊与轧件动态轧制过程的20辊轧机辊系-轧件一体化模型,并利用实际轧制数据对模型计算精度进行了验证。同时,利用该模型对20辊轧机轧制宽幅工业纯钛带的单一以及组合板形调控特性进行了仿真研究,结果表明：支承辊1#与7#、2#与6#对称位置分段压下与一中间锥辊窜辊组合调节时,随着窜辊量的增加,距边部75-300 mm区域厚度减薄最为显著,将导致或加剧该区域的二肋浪形；3#与5#、4#对称位置分段压下与一中间锥辊窜辊组合调节后,对缓解二肋浪形问题具有一定作用；此外,还发现一中间锥辊窜辊调节无法解决二肋浪形问题。最后,结合20辊轧机板形调控特性,提出了一种能够减小二肋浪形区的压应力的分段压下组合方案,工业实验证明分段压下组合方案实施后二肋浪形区压应力下降60%,有效缓解了20辊轧机轧制宽幅钛带时的二肋浪形缺陷及程度。

Abstract:

In order to grasp the regulation law of existing shape control means and to provide reasonable control strategy to solve the problem of double-rib wave, the problem of double-rib wave occurred frequently and was difficult to control when Sendzimir 20-high rolling mill rolled wide industrial pure titanium strip,Based on ABAQUS finite element software and considering the anisotropic mechanical characteristics of commercial pure titanium strip rolling, an integrated roller-strip model of 20-high rolling mill for realizing the dynamic rolling process of work roll and strip was established., and the calculation accuracy of the model is verified by the actual industrial rolling data. The model is used to simulate the single and combined shape control characteristics of wide industrial pure titanium strip rolled by 20-high rolling mill. The results show that the thickness of 75-300 mm from the edge decreases most significantly with the increase of roll channeling when the backup roll 1 # and 7 #, 2 # and 6 #symmetrical position subsection pressing is combined with the middle cone roll channeling roll, which will lead to or aggravate the double-rib wave; the combination of 3 # and 5 #, 4 # symmetrical position subsection pressing and the middle cone roll channeling can alleviate the problem of the two rib waveform, and it is also found that the adjustment of the middle cone roll channeling can not solve the problem of the double-rib wave.Finally, combined with the shape control characteristics of 20-high rolling mill, a piecewise reduction combination scheme is proposed, which can reduce the compressive stress in the double-rib wave zone,Industrial experiments show that the compressive stress in the double-rib wave zone decreases by 60% after the implementation of the piecewise reduction combination scheme, which effectively alleviates the double-rib wave defects when rolling wide titanium strip on 20-high rolling mill.#$NLKeywords: sendzimir 20-high mill; wide commercial pure titanium strip; high-order buckle; finite element; shape control characteristics;