锻压技术

基于热加工图的20CrMnTiH钢热成形性能及斜齿轮热成形模拟

英文标题：Hot formability of steel 20CrMnTiH based on hot processing map and simulation on hot forming of helical gear

作者：秦飞冯玮

分类号：TG142.1

出版年,卷(期):页码：2017,42(3):137-143

摘要：

针对齿轮材料20CrMnTiH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。

According to the requirement of hot processing optimization for steel 20CrMnTiH, the hot processing maps were established under different strains based on the dynamic material model (DMM), and the influences of strain on the hot workability were explored. Then, the safe region and instable region were determined, and the optimal hot processing window also could be obtained. Furthermore, combining microstructural observation and FEM simulation of microstructure, the reliability of hot processing map and the accuracy of microstructural simulation were verified. At last, the coupled finite element model of helical gear was established by DEFORM3D, and the microdeformation evolution laws were simulated by the optimal deformation temperature and strain rate region obtained by hot processing maps, which provided the theoretical and technical foundations for the hot forming of helical gear.

基金项目：

国家自然科学基金资助项目（51475344）；湖北省自然科学基金资助项目（2014CFB855）

秦飞（1992-），男，硕士研究生冯玮 (1973-)，女，博士，副教授

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