摘要
智能制造、电子通信等行业向微型化、集成化方向发展要求不断提升精密轧制带材产品质量,提高厚度精度控制是其中关键组成部分,因此,精密带材轧制过程接触变形区理论研究有着极其重要的意义。以Stone轧制力模型为代表的传统薄带材冷轧理论假设轧辊在接触变形区内保持圆弧状轮廓,利用Hitchcock公式求解接触弧长进而求得平均单位压力,并在此基础上建立了Stone最小可轧厚度理论。在试验及实际生产中很多学者发现有时Stone轧制力计算值与实际值相差甚远,这是由于某些轧制工况下接触变形区内存在中性区,轧辊圆弧状假设不再适用。中性区的存在使轧制力剧烈增大而带材金属延伸变形增加甚微,即轧制难度增大、轧制效率降低。通过对不同厚度薄带材轧制过程进行有限元分析,得到了不同道次压下率下接触变形区轮廓与接触压力分布的变化规律,带材初始厚度越小或道次压下率越大,接触变形区内中性区所占比例越大,接触压力分布趋于椭圆形分布;基于Stone轧制力公式建立了考虑轧制效率的薄带材最小可轧厚度模型,对于一定初始厚度与Stone最小可轧厚度比值,根据轧制工艺参数可计算接触变形区内恰好不存在中性区时的临界道次压下率,以此临界道次压下率为依据可确定高效轧制厚度范围及Stone轧制力模型的适用条件,为精密薄带材轧制生产过程提供理论指导。
With the miniaturization and integration development of the Intelligent manufacturing,electronic communication,and other industries,it is required to improve the product quality of precision rolled strips,especially for the control accuracy of the thickness.Therefore,the theoretical research on the contact deformation zone in the rolling process of the precision strip is of great significance.The Stone rolling force model as the classic model of conventional cold rolling theory of thin strip assumes that the roll maintains a circular profile in the contact deformation zone.And the average unit pressure is obtained by solving the contact arc length with the Hitchcock formula.On this basis,the Stone theory of the minimum rolling thickness is established.In the experiment and actual production,many scholars found that the calculated value of the Stone rolling force is far from the actual value sometimes.This is because there is a neutral zone in the contact deformation zone under some rolling conditions and the assumption of the circular roll shape is no longer applicable.The existence of the neutral zone increases the rolling force prominently,but the extension deformation of strip metal is very little,that is,the rolling difficulty increases,and the rolling efficiency decreases.The finite element method is used to analyze the rolling process of the thin strip with different thicknesses.The variation rules of the profile of the contact deformation zone and the distribution of contact pressure under different reductions are obtained.The smaller the initial thickness of the strip or the greater the single-pass reduction,the larger the proportion of the neutral zone in the contact deformation zone,and the contact pressure distribution tends to parabolic distribution.Based on the Stone rolling force formula,the minimum rolling thickness model of thin strips with rolling efficiency consideration is established.For the ratio of the initial thickness to the Stone minimum rolling thickness,the critical pass reduction can b
作者
刘晓
付伦
芦跃峰
王涛
肖宏
LIU Xiao;FU Lun;LU Yue-feng;WANG Tao;XIAO Hong(National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004,Hebei,China;College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment,Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China)
出处
《钢铁》
CAS
CSCD
北大核心
2021年第11期87-95,共9页
Iron and Steel
基金
国家自然科学基金资助项目(51474190,51974196)。
关键词
薄带材轧制
Stone轧制力模型
最小可轧厚度
接触变形区
轧制效率
thin strip rolling
Stone rolling force model
minimum rolling thickness
contact deformation zone
rolling efficiency
