大截面棒材矫直过程中性层偏移明显,对二辊矫直辊辊型及棒材直线度的影响较大.依据三点弯曲理论建立了棒材矫直过程中基于压力弹塑性变形的中性层偏移量理论计算模型,结合室温拉伸和弯曲试验,研究了棒材矫直过程中性层偏移规律.结果表明:反弯半径和棒材力学性能对中性层偏移值的影响显著,反弯半径越小,则中性层偏移量越大;强度较低、塑性较强的材料,中性层偏移量较大.通过弯曲试验,验证了该模型的可靠性及其适用范围. The stratification of the large section bars during the straightening process is obvious, which has a great influence on the straightness of the two-roller straightening roller and the bar.According to the three-point bending theory, the stress-strain- , A theoretical calculation model of the neutral layer offset was proposed.According to the tensile test and the bending test at room temperature, the displacement law of the layer in the straightening process of the bar was studied.The results show that the deflection of the neutral layer The effect of the value is significant, the smaller the bending radius is, the larger the offset of the neutral layer is; the lower the strength is, the stronger the plasticity is and the more the offset of the neutral layer is larger. The bending test verifies the reliability of the model Sex and its scope of application.