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以皮尔格轧机冷轧304不锈钢管为例,建立二辊模具的关键参数优化模型.首先通过在不同应变速率下材料的拉伸试验获得真应力-应变曲线数据,通过对真应力-真应变曲线进行非线性拟合,获得304不锈钢的本构方程;然后根据皮尔格冷轧钢管的变形特点,结合增量理论得出钢管当量变形量的计算方法,融合孔型参数和各工艺参数之间的关系,推导出二辊模具孔型变形区压下段和精整段长度之比Q值与材料应变速率之间的优化方程;最后利用材料卸载定律解出冷轧304不锈钢管过程特定阶段时的应变速率值,解出不同尺寸精度无缝钢管的Q值.以计算出的Q值为二辊模具的设计参数,根据皮尔格轧机孔型设计优化程序设计出轧辊和芯棒,并利用有限元仿真软件和现场轧制试验验证了本优化模型的正确性,验证成品管能够达到预期的尺寸精度.
Taking the Pirger cold rolled 304 stainless steel tube as an example, the key parameters optimization model of two-roll mold was established.Firstly, the true stress-strain curve data were obtained through the tensile test of materials under different strain rates, Then the constitutive equation of 304 stainless steel was obtained by nonlinear fitting. Then according to the deformation characteristics of Pilger cold-rolled steel tube and the increment theory, the calculation method of equivalent steel tube deformation was obtained. The relationship between the ratio of Q value and material strain rate was deduced. The relationship between Q value and material strain rate of two-roll die hole deformation zone was deduced. Finally, the material unloading law was used to solve the strain of 304 stainless steel tube during the specific stage The Q value of the seamless steel pipe with different dimensional accuracy was solved.The calculated Q value was the design parameter of the two-roll mold, the roll and the mandrel were designed according to the Pilger pass design optimization program, and the finite element simulation The software and the field rolling test verify the correctness of the optimization model and verify that the finished pipe can reach the expected dimensional accuracy.