基于高温铸坯蠕变规律的连铸坯幂函数连续矫直法  

Power Function Continuous Straightening Method for Casting Strand Based on Creep Behavior of Metal at Elevated Temperature

作　　者：任廷志[1] 韩培培[1] 

机构地区：[1]燕山大学国家冷轧板带装备及工艺工程技术研究中心,秦皇岛066004

出　　处：《中国机械工程》2015年第21期2952-2957,共6页China Mechanical Engineering

基　　金：国家科技支撑计划资助项目(2011BAF15B01)

摘　　要：根据国内外近年来高温铸坯蠕变规律研究成果,建立了矫直区内铸坯变形的数学模型,由此推导出矫直区内铸坯连续矫直曲线方程。辊列按照该矫直曲线布置,完全满足高温铸坯蠕变变形规律。矫直区内的铸坯在中间段实现了等应变速率变化规律,起始段和末尾段实现幂函数形式的应变速率变化规律。利用实验辊列装置对该矫直曲线进行了实验研究,采用一种常温完全蠕变锡铋合金代替高温铸坯,对实验铸坯所受矫直力与铸坯应变进行测量,所测结果与理论计算结果相吻合。According to the recent study results of the creep behavior of metal at elevated temper- ature, a mathematical model of the strand deformation was developed and a continuous straightening curve was derived. The rollers were arranged along the curve, making the roll apron fully accommo- date the creep behavior of metal at elevated temperature. Then the strand deformation features were presented. During the straightening process, the strain rates of the strand remained constant in the middle part of the straightening zone; while at the start and the end parts of the straightening zone, the strain rates of the strand were in the form of power function. Finally, an experimental research on the curve was carried out using a pilot roll supporting system. And the experimental material was a kind of Sn-Bi alloy to substitute the steel at elevated temperature. During the experimental process, the bending forces acting on the strand and the strains of the strand were measured. And the measure- ment results are in good agreement with the theoretical calculations.

关 键 词：连铸 连续矫直 应变 应变速率 

分 类 号：TF777.1[冶金工程—钢铁冶金]