Finite element simulation of the transverse distribution of tensile stress in the strip during continuous annealing process
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摘要: 为了获得带钢瓢曲发生的临界张力条件模型,建立抑制其产生的有效工艺措施,运用有限元中几何非线性屈曲计算方法,结合冲压领域的弹塑性屈曲理论,定量研究了退火炉内的七项关键因素——导向辊辊形、来料板形、带钢宽度、横向温差、焊缝位置、辊面摩擦系数和总张力——对带钢张应力横向分布的影响规律和作用机制.仿真发现导向辊辊形、带钢厚度等对张应力横向分布影响最为显著,揭示了瓢曲行为与横向张应力分布的内在关系,为制定抑制“热瓢曲”提供了有效的技术思路,并取得了良好的现场控制效果.Abstract: To set up the critical tension model of buckling and find the effective technologic measures to prevent the buckling, the effect and acting mechanism of seven major factors, roll profile, strip shape, strip width, transverse distribution of temperature, weld position, friction on the roll, and total tension, on the transverse distribution of tensile stress in a continuous annealing furnace were simulated by using the finite element method of geometrical nonlinear buckling calculation and the theory of elastic-plastic buckling in the field of stamping. The simulation results show that roll profile and thickness of the strip are the two most remarkable factors influenced on the transverse distribution of tension stress. The relationships between buckling and transverse distribution of tensile stress are revealed, and a valuable technologic measure was provided to control the "heat buckling" and proved to be well effective online.
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