压下量对中厚板矫直过程中关键参数的影响

Influence of rolling reduction on key parameters in the straightening process of plate

为了探讨中厚板在不同压下量条件下的矫直力能参数和工艺参数的分布规律,首先根据连续梁的三弯矩方程,推导了矫直力和矫直扭矩的模型,然后以相同的板材作为初始条件,研究了压下量对这些关键矫直参数的影响。研究结果表明:随着压下量的增加,板材与1号矫直辊的接触点逐渐向出口侧偏移,反弯曲率、残余曲率以及奇数辊处的矫直轨迹上升的幅度增加;塑性变形区域和程度逐渐增大,横向残余应力的消减量增加,但消减速度变慢,因此不应为了消减残余应力而盲目增加压下量;矫直力和弯曲内力矩的分布从三角形逐渐向梯形过渡。

To study the distribution rules of straightening force parameters and process parameters of plate during straightening process with different rolling reductions, the straightening force and torque models were deduced according to three moment equations of the con- tinuous beam firstly, and then the influences of roiling reduction on these key straightening parameters were studied by taking the same plate as initial condition. The results show that, with the increment of rolling reduction, the contact point between plate and straightening roller No. 1 moves partially to exit, the incremental amplitudes of the bending curvature, residual curvature and straightening trajectory at the odd roller are improved, the area and degree of plastic deformation increase gradually, and the reduction of transverse residual stress increases, but its reduction velocity gets slower. Therefore, the rolling reduction should not be improved blindly to diminish residual stress. And the distribution of straightening force and internal bending torques transforms from triangle to trapezoid.