CAJ | 학술논문

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。
경향열알시응용엄범적축승배선진소성가공기술，주조배배경향열알성형류정단、능모저、재료이용솔고，시일충저모고효성형신공예。여전통단조배배상비，주조배배초시정립조대차불균균，통과열알실현정립세균화시관건。문장기우주태GCr15축승강재료본구모형，이SIMUFACT 유한원연건위평태，건립주조GCr15축승배경향열알방진모형，통과열알실험험증모형적가고성。통과수치모의，분석주조GCr15축승배경향열알과정중정립연변규률，탐구료알제비、배배정립척촌、초시알제온도대열알과정정립연변적영향규률，위주조GCr15축승배경향열알정립세균화공제제공유효의거。
Hot radial ring rolling is an advanced plastic processing technology and has been widely used in bearing ring manufac-turing .Using this technology to directly process the as-cast ring blank is a new processing technology of high efficiency ,high ma-terial utilization and low energy consumption ,for it reduces and simplifies the current bearing ring processing steps .But the initial state of the cast ring blank ,compared to the forge ring blank ,is coarse and uneven in grain size and microstructure .So the key problem is to refine the grain size and improve the microstructure through hot radial ring rolling process .The as-cast GCr15 ring bank is used in this study and finite element simulation models were established based on the constitutive models of as-cast GCr15 steel under the SIMUFACT platform .The hot radial ring rolling experiment of as-cast GCr15 steel was carried out to validate the finite element models .The grain evolution rules of the as-cast GCr15 steel during hot radial ring rolling were numerically ana-lyzed;the effects of key processing parameters including the forging ratio ,the initial rolling temperature and the initial grain size on the grain evolution rules were revealed .The results would provide guidance for grain size refinement controlling during hot ra-dial ring rolling of as-cast ring blank .