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通过有限元数值模拟,采用选取GH4169合金叶片终锻件上典型截面及追踪预锻件上特征点在整个终锻成形过程中金属流动特点及变化趋势的研究方法,从而较深入全面的揭示了不同工艺参数下叶片终锻成形演化规律。研究结果显示:等效应变及应力场的分布均随着始锻温度的升高而愈均匀;等效应力场、温度场及载荷-行程曲线对于上模下压速度敏感性较强,较大的变形速度引起大温升,还易使变形体内部组织晶格形变,产生大的附加应力及应力集中,且上模出现瞬时峰值载荷的时间越早但次数反而越多;摩擦因子的增大对叶身中部纵向截面最低温度升幅影响较大,增加了锻造难度的同时使变形渐不均匀。
Through the finite element numerical simulation and the method of selecting the typical cross section of GH4169 alloy blade final forging and tracing the characteristic points of the metal on the preform forging during the final forging process and using the research method of metal flow characteristics and trends, The Evolution of the Blade Final Forging Process. The results show that the distribution of equivalent strain and stress field are more uniform with the increase of initial forging temperature. The equivalent stress field, temperature field and load-stroke curve are more sensitive to the pressure of upper die, Of the deformation rate caused by a large temperature rise, but also easy to deformation of the internal deformation of the crystal lattice, resulting in large additional stress and stress concentration, and the instantaneous peak load appear on the die earlier but the number of times the more contrary; increased friction factor The middle part of the blade central longitudinal section of the minimum temperature rise greater impact, an increase of forging difficulty at the same time make the deformation gradually uneven.