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为了计算在应变速率100～400s-1、温度900～1050℃条件下四道次连续线材轧制过程中的轧制力,提出了一个流变应力方程。基本概念是对Shida模型和Misaka模型进行改进。通常用这2种模型建立的流变应力本构方程来描述高温材料在不同应变率下的变形行为。将改进模型与有限元方法相结合来计算应变速率100～400s-1、温度900～1050℃条件下的四道次连续轧制过程中的轧制力。测量材料在每个道次的轧制力和表面温度,并与预测值进行比较。结果表明,在高温、中应变速率条件下,Misaka模型比Shida模型更好。在900℃时,采用Misaka模型的轧制力误差为-5.7%。在1050℃时,采用Misaka模型的轧制力误差为-15.2%,而采用改进的Misaka模型的轧制力误差降低到1.8%。由此可以得出,对于高温、中应变速率的线材轧制过程,改进的Misaka模型能用来预测高温材料的变形行为。
In order to calculate the rolling force during the rolling process of four passes with the strain rate of 100 ~ 400s-1 and temperature of 900 ~ 1050 ℃, a flow stress equation was proposed. The basic idea is to improve Shida and Misaka models. The rheological stress constitutive equations established by these two models are usually used to describe the deformation behavior of high temperature materials at different strain rates. The improved model and the finite element method are combined to calculate the rolling force in the four-pass continuous rolling process with the strain rate of 100 ~ 400s-1 and the temperature of 900 ~ 1050 ℃. The rolling force and surface temperature of the material at each pass were measured and compared with the predicted values. The results show that the Misaka model is better than the Shida model at high temperature and medium strain rate. The error of rolling force with Misaka model is -5.7% at 900 ℃. The error of rolling force with Misaka model is -15.2% at 1050 ℃, while the error of rolling force with the modified Misaka model is reduced to 1.8%. From this we can conclude that the improved Misaka model can be used to predict the deformation behavior of high temperature materials during the wire rolling process at high temperature and medium strain rate.