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针对低筋、多筋铝合金锻件容易产生穿流缺陷的成形特点,采用有限元模拟方法分析了筋顶分模和中间分模对低筋、多筋锻件成形过程中金属流动行为的影响机理,对比了两种分模方式对锻件流线、穿流敏感度、模具磨损、材料率用率和成形力等的影响。结果表明:采用筋顶分模方式能从根本上消除锻件上与飞边相邻筋下的穿流缺陷,得到良好的金属流线,而其他性能与中间分模基本相同。因此,在模具深度和锻件出模容许的情况下,对于低筋、多筋圆饼类铝合金锻件应尽量采用筋顶分模进行模具的设计。
In view of the forming characteristics of low flow and multi-section aluminum alloy forgings, the influence of metal flow behavior during the forming process of low-tendon and multi-tendon was analyzed by finite element method. The influence of two kinds of parting modes on the flow of forgings, flow-through sensitivity, die wear, material rate and forming force were compared. The results show that the use of rib top mode can fundamentally eliminate the flow defects on the forging near the flash and obtain a good metal flow line, while the other performance is basically the same as the middle parting mode. Therefore, the depth of the mold and forgings die permitting circumstances, for low-gluten, multi-bar round pie forgings should be used as far as the top mold design die.