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基于设计的轧辊孔型,使用三维有限元分析软件Simufact,对28Ni Cr Mo V8.5钢管典型规格准16 mm×1.5mm皮尔格冷轧过程进行了数值模拟。研究了不同摩擦系数及孔型开口系数对冷轧管横向壁厚分布及精度的影响规律。结果表明:钢管的横向壁厚分布是不均匀的,在孔型开口及孔顶处出现最小值,在孔型侧壁角45°两侧出现最大值。随着摩擦系数和孔型开口系数增大,不均匀的横向壁厚变得更加严重。当轧辊与轧件的摩擦系数由0.080增大到0.095时,冷轧管的横向壁厚精度由5.51%变到6.98%;当孔型开口系数由0.051增大到0.061时,横向壁厚精度由5.51%变到8.11%。
Based on the design of roll pass, three-dimensional finite element analysis software Simufact was used to simulate the Pilger cold rolling process of 28Ni Cr Mo V8.5 steel tube. The influence of different friction coefficient and hole opening coefficient on the distribution and accuracy of transverse wall thickness of cold-rolled tube was studied. The results show that the transverse wall thickness distribution of the steel pipe is not uniform, and the minimum appears at the hole opening and the top of the hole. The maximum appears at 45 ° of the side wall angle of the hole pattern. As the friction coefficient and orifice opening coefficient increase, the uneven transverse wall thickness becomes more severe. When the friction coefficient between roll and rolling increases from 0.080 to 0.095, the accuracy of the transverse wall thickness of the cold-rolled tube changes from 5.51% to 6.98%. When the aperture coefficient increases from 0.051 to 0.061, the precision of the transverse wall thickness from 5.51% changed to 8.11%.