由于加工、安装、变形与磨损等原因,连铸机辊列中的辊子会偏离设计位置而产生错位,这对铸坯鼓肚变形产生较大影响.基于高温铸坯黏弹塑性本构方程,建立两辊间距内的铸坯坯壳动态鼓肚数学模型,并利用模型计算试验铸机的铸坯坯壳鼓肚曲线,依照实测数据验证了模型的有效性.根据奥钢联工业连铸机的设备及工艺参数,计算铸机不同扇形段内铸坯坯壳在不同辊子错位量情况下的鼓肚变形,并讨论在辊子发生错位的情况下辊间距对铸坯坯壳固液交界面处最大应变的影响,并给出铸机辊间距的确定方法.
Due to eccentricity of rolls,installation error of rolls,bending and wearing of rolls,the rolls deviate from the designed positions,causing roll misalignment,which exerts significant influences on the bulging of continuous casting slab. Based on the elasto-viscoplastic behavior of steel at an elevated temperature,a mathematical model of dynamic bulging with the movement of the slab between two roll pitches was developed. Then according to the model,the bulg-ing profiles of the slab on a pilot caster were computed. And in order to check the validity of this mathematical model, the calculated bulging profiles were compared with the measurements on a pilot caster. Then the bulging profiles of the slab combined with roll misalignments on the different segments of an industrial caster designed by VAI were computed according to the equipment and process parameters. The influences of roll pitches on the maximum strain at the solidify-ing front with specified roll alignment tolerances were discussed,and then an optimization method of roll pitches was presented.
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