摘要
建立了镁合金板材轧制过程的热量变化方程,并对其热力耦合过程进行了有限元分析,结果和实验结果吻合。结果表明:轧制过程的温度变化主要是由变形产热、摩擦生热和板料-轧辊接触导热、与环境对流辐射决定,且板料的温度变化受板和轧辊温度梯度的影响。随着温度的下降,轧制力和等效应力线性增加。当温度降到210℃,等效应力达到160MPa时,板料将出现边裂缺陷,达到轧制成型极限。板料较佳轧制温度应高于210℃。
A heat equation has been built for the rolling process of magnesium alloy sheets, and the finite element method （FEM） has been adopted to analyze the thermal-mechanical process. The FEM results are in agreement with experiment results. The results show that, the temperature change during rolling is caused by heat generation by deformation and friction and heat transfer between sheet and roller, sheet and environment. And the temperature change is affected by the temperature gradient. With the decrease of temperature, rolling force and equivalent stress increase linearly. When the temperature is reduced to 210 ℃, the equivalent stress is 160 MPa, edge cracking takes place, and the rolling limit is reached. Therefore, the rolling temperature should be above 210 ℃.
基金
国家973重点基础研究发展计划项目(2007CB613700)
国家"十一五"科技支撑计划重点项目(2007BAG06B04)
重庆市科技攻关重点项目(CSTC
2009AB4008)
国家杰出青年科学基金(50725413)
关键词
镁合金
轧制
温度梯度
有限元
magnesium alloy
roll
temperature gradient
finite element analysis（FEA）
