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径向热轧是应用广泛的轴承环先进塑性加工技术,铸造环坯径向热轧成形流程短、能耗低、材料利用率高,是一种低耗高效成形新工艺。与传统锻造环坯相比,铸造环坯初始晶粒粗大且不均匀,通过热轧实现晶粒细匀化是关键。文章基于铸态GCr15轴承钢材料本构模型,以SIMUFACT有限元软件为平台,建立铸造GCr15轴承环径向热轧仿真模型,通过热轧实验验证模型的可靠性。通过数值模拟,分析铸造GCr15轴承环径向热轧过程中晶粒演变规律,探究了轧制比、环坯晶粒尺寸、初始轧制温度对热轧过程晶粒演变的影响规律,为铸造GCr15轴承环径向热轧晶粒细匀化控制提供有效依据。
Radial hot rolling is a widely used advanced plastic processing technology of bearing rings. It has the advantages of short radial hot rolling forming process, low energy consumption and high material utilization rate. It is a new technology of low energy consumption and high efficiency forming. Compared with the traditional forging billet, the initial ring of the billet is coarse and non-uniform. It is the key to achieve the fine grain homogenization by hot rolling. Based on the constitutive model of as-cast GCr15 bearing steel, the simulation model of radial hot rolling of GCr15 bearing ring was established by SIMUFACT software. The reliability of the model was verified by hot rolling test. Through the numerical simulation, the evolution of the grains in the radial hot rolling process of cast GCr15 bearing rings was analyzed. The effects of the rolling ratio, the grain size of the blank ring and the initial rolling temperature on the grain evolution during the hot rolling process were investigated. Bearing ring radial hot rolling grain fine uniform control provides an effective basis.