以上界三角形速度场计算线材精轧温升

提出了以上界三角形速度场计算高速线材精轧阶段温升的方法.由于线材精轧轧制速度快,散热条件差,可认为轧制过程是绝热的,线材轧制的外功几乎全部转换为热,即线材温升的热量全部来自于变形区内三角形速度场速度不连续线所做的剪切功.三角形速度场确定的总上界功率最小上界值决定了变形区内全部温升的总和,以此原理推导出高速线材精轧机组温升计算公式并对6.5 mm线材精轧进行了实际温升计算与测量,计算结果与测量结果的比较表明,计算的理论温升高于实际测量温升约11%,线材精轧入口温度越低,累计温升越大.

Calculating Temperature Jump During High-Speed Wire Rolling Through Upper Bound Triangular Velocity Field

A new method is proposed to calculate the temperature jump during high-speed wire finish rolling through upper-bound triangular velocity field. Due to the very high speed and poor heat dissipation, it is supposed that the external work done during the high-speed wire rolling is nearly all converted into heat since the process is adiabatic. It implies that all the quantity of heat due to temperature jump comes from the shear work done along the tangential velocity discontinuity lines in triangular velocity field in the rolling deforming zone. The total temperature jump at a rolling pass depends on the minimal value of the upper-bound power determined by the velocity field. Then, a formula is derived to calculate the temperature jump of high-speed wire rolling tandem mill, which is used to calculate the temperature jump during finish rolling of φ6.5 mm wire, with a measurement carried out for comparison. The results show that the calculated values of temperature jump is about 11% higher than measured ones, and it is found that the lower the temperature at the entry of finishing mill, the greater the accumulative temperature jump.