钛合金VAR熔炼用电极块压制过程模拟研究

Research on the Pressing Process of Electrode for Titanium Alloy VAR Melting

采用数值模拟方法研究钛合金真空自耗电弧熔炼(VAR)用电极块的压制过程,借此达到优化电极块压制成型工艺参数及改进模具设计的目的。借助Shima-Oyane本构模型并结合相关实验重点对电极块压制过程中的相对密度分布、粉末颗粒的流动规律进行分析。同时对现有压制模具进行优化,将凸模的圆弧段改为直线并减小斜边倾斜角度。凸模优化后,粉末颗粒整体流动性增加,电极块相对密度提高,表面裂纹基本消除。

Numerical simulation method was used to study the pressing process of electrode for titanium alloy vacuum arc remelting(VAR),so as to optimize the process parameters of electrode and improve the die design.By means of Shima-Oyane yield criterion and experiment research,the relative density distribution and flow law of powder particles were studied systematically.At the same time,the existing pressing punch was optimized by changing the circular section of punch to a straight line and reducing the inclined angle of the hypotenuse.After optimization,the overall fluidity of powder particles increases,resulting in the increase of relative density of electrode blocks and the elimination of surface cracks.