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利用非线性有限元数值模拟方法,对异步轧制过程中轧板金属流动的速度场、应变场、变形区内由摩擦引起的“搓轧区”现象及附加剪切变形区的受力进行研究,并分析这些因素对翘曲的影响规律。结果表明,由于轧板上下部分变形速度不同,在稳定轧制阶段始终存在速度差,导致轧向和法向的变形不对称,并引起轧板厚向上不同部位产生应变差,最终导致翘曲。另外,由于“搓轧区”上下两部分所受轧辊摩擦力方向相反,由此产生的正弯矩和贯穿轧板厚向的附加剪切变形,也是引起翘曲的重要因素。
The nonlinear finite element numerical simulation method is used to analyze the velocity field and strain field of the metal flow in the rolling process and the “rubbing-rolling zone” caused by friction in the deformation zone and the stress of the additional shear deformation zone Conduct research, and analyze the influence of these factors on warpage. The results show that due to the different deformation speed of the upper and lower parts of the rolling plate, the speed difference always exists in the steady rolling stage, resulting in asymmetric deformation in the rolling direction and in the normal direction and causing strain difference in different parts of the rolling plate, finally resulting in warping. In addition, the positive bending moment and the additional shearing deformation in the thickness direction of the rolling plate are also important factors for the warpage due to the opposite frictional force of the upper and lower parts of the rubbing rolling zone.