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拉伸矫直是提高型材平直度的重要手段。以一维弯曲的圆形截面棒材为研究对象,基于拉伸矫直的对称性,建立了纵剖面1/2的三维几何模型,运用MARC有限元软件对拉伸矫直变形过程进行大量工况的数值仿真计算,并就矫直温度、位移、原始弯曲度、棒材原始直径对残余弯曲度的影响进行了研究,然后用逐步回归法对仿真计算数据进行拟合,获得棒材残余弯曲度与矫直工艺参数及棒材几何尺寸的关系数学模型。研究表明,AZ31棒材较为适宜的矫直温度为160～200℃,尽管棒材残余弯曲度模型预测结果与实验结果存在一定误差,但该预测模型揭示的矫直工艺参数对矫直的影响规律与实验结果较为一致。
Tensile straightening is an important means to improve the straightness of profile. Taking a one-dimensional curved circular section bar as the research object, a three-dimensional geometric model of longitudinal section 1/2 was established based on the symmetry of tensile straightening. A large number of workpieces of the straightening and deformation process were carried out using MARC finite element software The effects of straightening temperature, displacement, original bending degree and original diameter of bar on the residual bending degree were studied. Then, the simulation data were fitted by stepwise regression to obtain the residual bending of the bar Relationship between Degree and Straightening Process Parameters and Rod Geometric Size Mathematical Model. The results show that the suitable straightening temperature of AZ31 bar is 160 ~ 200 ℃. Although there is some error between the prediction results of residual curvature model of bar and experimental results, the prediction model reveals the influence of straightening process parameters on straightening And the experimental results are more consistent.