基于数值模拟的叶片模锻模具应力分析

Die Stress Analysis of Blade Die Forging Based on Numerical Simulation

采用有限元数值技术结合叶片实际模锻成形过程,分析了锻模应力、温度分布及模锻过程中出现的锻件缺陷、应力集中等问题。结果表明:叶片锻件主要缺陷为折叠,出现在叶根与叶冠过渡圆角处;最大等效应力及应力集中出现在叶根底部圆角处,应力分布随着距该位置距离的增加而减小;较大的过渡圆角半径有利于消除或减少折叠缺陷,同时缓解模具应力集中;叶根底部圆角半径由5 mm增大到12 mm,能阻止裂纹的产生,延长锻模寿命;有限元模拟结果和实际结果较为吻合。

Combining with the actual blade forging process, the stress and temperature distribution of the forging die, and the problem of the forging defects and stress concentration in die forging were analyzed. The results show that main defects of the blade forging are lapping, where appear in the fillet between the blade root and blade crown. The maximum equivalent stress and the section of stress concentration are at the bottom of blade root fillet, and the stress distribution decreases with the increase of the distance of blade. The larger the fillet radius helps to eliminate or reduce the folding defect, at the same time,relieve the die stress concentration. That the fillet radius of blade root bottom increases from 5 mm to 12 mm can prevent crack, and prolong the die life. The finite element simulation results are consistent with actual results.