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针对齿轮材料20Cr Mn Ti H钢的热加工工艺优化的需求,建立了其基于动态材料模型(DMM)的不同应变下的热加工图,揭示了应变对其加工性能的影响规律,得到了成形过程中的安全区和失稳区,并获得了该材料最佳热加工工艺窗口。结合有限元组织模拟和微观组织观察分析,验证了热加工图的可靠性和其热变形组织模拟的准确性。基于DEFORM-3D建立了斜齿轮变形-传热-微观组织演化耦合的有限元模型,结合热加工图所获得的优化变形温度和变形速率区间,模拟分析了斜齿轮热精密成形微观变形规律。
In order to optimize the hot working process of gear material 20Cr Mn Ti H steel, the thermal processing diagram under different strain based on dynamic material model (DMM) was established, the influence law of strain on its workability was revealed, and the forming process In the safe zone and destabilization zone, and obtained the best thermal processing technology window of the material. Combined with the finite element simulation and microstructure observation and analysis, the reliability of the hot working diagram and the accuracy of the hot deformation microstructure simulation are verified. Based on DEFORM-3D, a coupled finite element model of helical gear deformation-heat transfer-microstructure evolution was established. According to the optimal deformation temperature and deformation rate interval obtained from hot working drawing, the microscopic deformation of helical gear hot forming was simulated and analyzed.