液压张力温轧实验轧机薄带在线加热温度控制

采用电阻加热的方法对试样施加低电压大电流实现在线加热.为保证薄板加热过程中的测温精度和温度均匀性,设计了接触式测温仪和双回路加热装置.温度控制器采用前馈控制器和反馈控制器相结合的方式,以薄板电阻加热时的热平衡方程为基础进行前馈控制器设计,反馈控制采用PID控制器,将前馈和反馈控制量叠加后作为温度控制器的总设定值.该技术能够满足试样加热速率和温度控制精度的要求,通过在轧制过程中持续补温,提高试样的温度均匀性.

Temperature Control of Online Heating Strip on Hydraulic Tension Experimental Warm Rolling Mill

The method of resistance heating was used to heat the workpiece online by applying low voltage and large current. The double loop heating devices and contact-type thermometers were designed to ensure the measurement accuracy and temperature uniformity of the thin plate. The temperature controller adopted the way of combining feedforward and feedback controllers and the setting value of the temperature controller was summed output from the two controllers， in which the feedforward controller was designed on the basis of the heat balance equation of the resistance heating sheet and the PID controller was used as the feedback controller. The results in practice showed that the technology could meet the requirements of heating rate and temperature-controlled precision， and the temperature uniformity was improved by continuous heating in the rolling process.