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针对轧制过程非稳态及润滑特性,通过流体力学分析,建立稳态、非稳态轧制变形区油膜厚度分布模型,提出油膜波动系数以研究油膜厚度的绝对波动,应用卡尔曼微分方程分析了稳态、非稳态轧制界面应力分布,并以稳态应力分布为基础提出应力波动系数以研究变形区应力的绝对波动.结果表明:稳态下压下率增加,轧制界面油膜变薄,压应力、切应力均增加;非稳态下随着入口板带厚度等扰动因素的波动加剧,油膜波动系数变大,绝对波动加剧;不同时刻非稳态压应力波峰的位置和数值都会发生变化;相比于切应力,油膜波动对压应力的影响比较大,当油膜厚度发生6.33%的绝对波动时,压应力和切应力分别产生1.17%和0.24%的绝对波动.
According to the unsteady state and lubrication characteristics of the rolling process, the thickness distribution model of oil film in steady state and unsteady rolling deformation zone was established by hydrodynamics analysis. The oil film fluctuation coefficient was proposed to study the absolute fluctuation of oil film thickness. By applying Kalman differential equation The stress distribution in steady state and unsteady rolling interface is presented, and the stress fluctuation coefficient is put forward based on the steady state stress distribution to study the absolute fluctuation of stress in the deformed area. The results show that the reduction rate under steady state increases, The compressive stress and the shear stress are all increased. In the non-steady state, with the fluctuation of the disturbance factors such as the thickness of the inlet slab aggravated, the coefficient of variation of the oil film becomes larger and the absolute fluctuation aggravates. The position and the numerical value of the unsteady compressive stress peak at different instants Compared with the shear stress, the influence of oil film fluctuation on compressive stress is relatively large. When the oil film thickness is 6.33% absolute fluctuation, the compressive stress and shear stress produce absolute fluctuations of 1.17% and 0.24% respectively.