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采用箱型-箱型-箱型-箱型-椭圆-圆孔六道次孔型系统建立棒材热轧几何模型,并确定轧制力数学模型。基于Deform-3D生成棒材轧制数值仿真模型,对250 mm×250 mm的P110石油套管用钢坯6道次热连轧过程进行有限元模拟得到了轧制过程中棒材的应力、应变及轧制力等参数的变化特点,验证了孔型设计系统的合理性,通过对比粗轧中轧制力矩的实测值和模拟值验证了有限元模型的可靠性。分析六道次的轧制力变化规律以及对比轧制力理论计算、数值仿真和实测值,结果证实了有限元模型的合理性,同时为保证轧材质量提供了理论依据。
The hot-rolling geometric model of the bar was established by using the box-box-box-box-box-ellipse-circular hole six-pass system and the mathematic model of the rolling force was established. Based on Deform-3D, a numerical simulation model of bar rolling was established. The hot rolling process of billet for P110 oil casing of 250 mm × 250 mm was simulated by finite element method. The stress, strain and rolling And force and other parameters to verify the rationality of the hole design system. The reliability of the finite element model is verified by comparing the measured values and simulated values of the rolling torque in roughing. The variation of rolling force of six passes and theoretical calculation, numerical simulation and measured value of comparative rolling force were analyzed. The results confirmed the rationality of finite element model and provided a theoretical basis for ensuring the quality of rolling material.