钢管张力减径过程传热模型

为了提高钢管张力减径过程的轧制质量、降低能耗以及控制终轧温度的准确性,从而为钢管出炉温度提供科学设定依据,通过对传热机理分析,建立了钢管张力减径过程传热模型,给出了除鳞、轧制及空冷阶段钢管边界热流的计算式.基于塑性材料的变分原理,建立了轧制变形区的变形热计算模型.结果表明:变形热对钢管温度分布影响不可忽略;该模型能真实反映钢管在张力减径过程中的温度变化,与实测结果吻合较好,可用于钢管再加热和张力减径过程中的参数分析及工艺优化.

Heat transfer model in pipe stretch-reducing process

In order to improve the rolled quality of pipe stretch-reducing process, reduce energy consumption, exactly control finishing temperature, and thus offer scientific set values to pipe tapping temperature, based on analyzing the mechanism of heat transfer, a mathematical model of heat transfer in pipe stretch-reducing process is derived, in which the boundary conditions in the processes of descaling, rolling and air cooling are provided. The equation of deformation heat in rolling deformation zone is also obtained using the variation principle of plastic material. The results indicate that the effect of deformation heat on the steel pipe's thermal distribution should not be ignored. The mathematical model provided can present the pipe's temperature fluctuation and agree well with the testing values in the process of stretch-reducing. Accordingly, the model can be used in the parameter analysis and technologic optimization of the processes of steel pipe reheating and stretch-reducing.