Abstract: The numerical simulation of process of four stand tandem KOCKS mill continuous rolling Ф16 mm GCr15 bearing steel bar from Ф21.5 mm stock has been carried out by using DEFORM-3D three-dimensional heavy deformation thermal-mechanical coupled with elastic-plastic finite element software. And the rolling process parameters for stock rolling in KOCKS mill roll pass including equivalent stress, equivalent strain, temperature field and rolling force of steel are analyzed. Results show that the deformation of steel bar in KOCKS mill occurs mainly at rough rolling passes, and that at finish passes is small, especially at last pass ； the spread of steel bar in KOCKS mill stands is uneven, that near the roller area is smaller and that near the roll gap is larger to form bulge ； and in KOCKS mill stands the equivalent strain reaches the center of steel bar, it is available to ensure the compact density of structure and internal quality of finishing products. The relative error between simulated value and measured value of rolling force at each pass in situ is less than 2%.

Key words: GCr15 Bearing Steel Bar, KOCKS Mill, Continuous Rolling Process, Numerical Simulation, Measuring at Situ

摘要： 采用DEFORM-3D三维大变形热力耦合弹塑性有限元软件对Ф21.5 mm GCr15轴承钢坯料在四架KOCKS轧机连轧成Φ16 mm棒材工艺过程进行了数值模拟。分析了棒材在KOCKS轧机孔型中轧制时的等效应力、等效应变、温度场以及轧制力等轧制工艺参数。结果表明，棒材在KOCKS机组中的变形主要发生在延伸孔型，精轧孔型的变形量较小，尤其在最后一道次；棒材在KOCKS机组中的宽展是不均匀，在靠近轧辊的区域宽展较小，在辊缝处宽展较大并产生鼓形;棒材在KOCKS机组中等效应变已达到芯部渗透，这对保证组织致密度和成品内部质量是非常有利的，现场各道次轧制力的实测值与模拟值的相对误差＜2%。

关键词: GCr15轴承钢棒材, KOCKS轧机, 连轧工艺, 数值模拟, 现场测试