板材角轧过程平面形状演变规律

Plan View Pattern Evolution Rules of Metal Plates During Angular Rolling

摘要:

建立了基于影响函数法的数学模型，利用仿真和实验方法研究了角轧制过程中板块的平面板形演化规律。结果表明，随着第1道旋转角度的增加，板材角部与其他部位的伸长率差异增大，这是长宽夹角随第1道旋转角度增大而呈下降趋势的主要原因。随着第2道旋转角度的增加，长宽角呈上升趋势，这是由于板材角部（钝角）与他部位的伸长率差异随着第2道旋转角度的增加而增大。ε_w（宽度方向上的变形）随着第1道或第2道旋转角度的增加而增大，这是宽展随第1道或第2道旋转角度增大的主要原因。考虑到2次轧制的压下量相同，当第2道的旋转角度是第1道旋转角度的2倍时，板材几乎可以恢复到矩形。预测的长宽夹角和宽展值与实验值吻合较好，表明所建立的基于影响函数法的计算模型能够准确估计长宽夹角和宽展。

Abstract:

A mathematic model based on influence function method was established and the plan view pattern evolution rules of plates during angular rolling were studied by simulation and experimental methods. Results show that the difference in the elongation between the area near the angular point and other parts of the plate increases with the increase in the rotation angle of the first pass, which is the main reason why the length-width angle shows a downward trend with the increase in the rotation angle of the first pass. The length-width angle shows an upward trend with the increase in the rotation angle of the second pass, which can be attributed to the fact that the difference in the elongation between the area near the angular point (obtuse angle) and other parts of the plate increases with the increase in the rotation angle of the second pass. ε_w (the deformation in the width direction) increases with the increase in the rotation angle of the first or second pass, which is the primary reason why the width spread increases with the increase in the rotation angle of the first or second pass. Considering the same absolute reduction amount of the two passes, when the rotation angle of the second pass is two times the rotation angle of the first pass, the plates can return to almost rectangular. The predicted length-width angle and width spread values are in good agreement with the experimental ones, indicating that the established computational model based on influence function method can accurately estimate the length-width angle and width spread.