锻压技术

空洞闭合预测模型的数值模拟研究

英文标题：Research on numerical simulation for cavity closure prediction model

作者：秦敏刘建生

单位：太原科技大学

分类号：TG316

出版年,卷(期):页码：2020,45(6):8-15

摘要：

以镦粗工艺为例，研究了在压应力状态下空洞闭合演变规律，并建立了压应力状态下的空洞闭合预测模型。在锻件成形过程中，常被用来描述和表征空洞闭合的因素有等效应变、静水应力、应力三轴度。对有空洞模型和无空洞模型的镦粗过程进行数值模拟，通过模拟结果分析了这些因素与空洞闭合过程之间的关系。发现Mises等效应变不仅可以反映同一空洞闭合过程，还可以反映不同位置空洞在同一时刻的空洞闭合状况。另外，模拟计算了高径比分别为0.75，1，1.5和2的圆柱的镦粗过程，建立了Mises等效应变与空洞闭合率K之间的关系，获得了完整的空洞闭合预测模型，其中包括空洞压缩阶段模型和空洞愈合阶段模型。通过二次开发将空洞闭合预测模型植入DEFORM软件中，生成用户自定义的参数K，在DEFORM软件的后处理模块中，可以直接观察成形过程中任意位置的空洞闭合状态。

For the upsetting process, the evolution law of cavity closure under compressive stress status was studied, and the cavity closure prediction model under compressive stress status was established. However, the factors often used to describe and characterize cavity closure during forming process of forgings were effective strain, hydrostatic stress and stress triaxiality. Therefore, the upsetting processes with and without cavity model were simulated numerically respectively, and the relationships between these factors and the process of cavity closure were analyzed respectively by simulation results. It is found that Mises effective strain not only reflects the closure process of the same cavity, but also reflects the closure state of cavities in different positions at the same time. Furthermore, the upsetting processes of cylinders with height to diameter ratios of 0.75,1,1.5 and 2 were simulated and calculated respectively, the relationship between Mises equivalent strain and cavity closure rate K was established, and the complete cavity closure prediction model including cavity compression stage model and cavity bonding stage model was obtained. Finally, the cavity closure prediction model was implanted into the software DEFORM by the secondary development to generate a user-defined parameter K, and the cavity closure status in any position during the forming process can be directly observed in the post-processing module of software DEFORM.

基金项目：

国家自然科学基金资助项目(51775361);山西省自然科学基金重点资助项目（201601D011002）

秦敏（1980-），女，博士，讲师 E-mail：wsqm2008@163.com 通讯作者：刘建生（1958-），男，博士，教授，博士生导师 E-mail：jiansliu@163.com

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