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针对薄带钢冷轧生产过程中出现的翘曲复合瓢曲板形缺陷,应用扁壳理论和伽辽金虚位移原理,建立了非均匀载荷作用下屈曲变形解析计算模型,求解获得了具有初始翘曲缺陷的带钢再发生瓢曲变形的屈曲临界载荷和临界波长,讨论分析了初始翘曲对瓢曲变形的影响规律。计算结果表明,随着带钢翘曲程度的增大,瓢曲变形的屈曲临界载荷增大,即越难出现瓢曲缺陷;当翘曲为C翘缺陷时,中浪型瓢曲的屈曲临界波长随翘曲值的增大而增大,边浪型瓢曲的屈曲波长则随翘曲值的增大而减小;当翘曲为L翘和四角翘时,中浪和边浪型瓢曲的临界波长随着翘曲值的增大而减小。在实验轧机上进行轧制实验研究,通过设计工况在铝板轧制中获得了翘曲复合瓢曲的板形缺陷模态,验证了解析计算方法的正确性。同时,运用ANSYS有限元法对实验轧制工况进行仿真分析,获得了与实验结果基本一致的翘曲复合瓢曲的板形缺陷模态,和与解析计算结果吻合良好的屈曲临界条件,进一步证明了解析计算结果的准确性。
Aiming at the warping composite scalloped flaws in the cold rolling process of thin strip, the analytical model of buckling deformation under nonuniform load is established by using the theory of flat shell and the Galerkin virtual displacement principle. The critical buckling load and the critical wavelength of the buckling deformation occurred in the strip with warpage. The influence of the initial warping on the buckling deformation was discussed. The calculation results show that with the increase of warpage, the critical buckling load of buckling deformation increases, that is, the more difficult the buckling failure occurs. When the warpage is C The wavelength increases with the increase of warpage, and the buckling wavelength decreases with the increase of warpage. When the warp is warped and the warp is warped, The critical wavelength of the curve decreases as the warp value increases. The experimental research on the rolling mill was carried out on the experimental rolling mill. The shape of the plate-shaped defect in the warping composite buckling was obtained through the design of working conditions. The correctness of the analytical calculation method was verified. At the same time, the finite element method of ANSYS is used to simulate the experimental rolling conditions, and the shape of the plate defect of the warpage composite buckling is obtained, which is basically consistent with the experimental results. The buckling critical conditions are in good agreement with the analytical results. Prove the accuracy of the analytical results.