基于高温铸坯蠕变规律的连铸坯幂函数连续矫直法

摘要/Abstract

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。

关键词: 连铸, 连续矫直, 应变, 应变速率

Abstract:

According to the recent study results of the creep behavior of metal at elevated temperature, 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 accommodate 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 measurement results are in good agreement with the theoretical calculations.

Key words: continuous casting, continuous straightening, strain, strain rate

中图分类号:

TF777.1

任廷志, 韩培培. 基于高温铸坯蠕变规律的连铸坯幂函数连续矫直法[J]. 中国机械工程, 2015, 26(21): 2952-2957.

Ren Tingzhi, Han Peipei. Power Function Continuous Straightening Method for Casting Strand Based on Creep Behavior of Metal at Elevated Temperature[J]. China Mechanical Engineering, 2015, 26(21): 2952-2957.

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