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提出了超大规格铝合金航空模锻件局部加载成形工艺方案,利用三维有限元软件Deform-3D对锻件分段局部加载成形载荷、两道次之间变形量分配、变形均匀性进行了仿真分析。结果表明:大型锻件局部等温加载工艺可有效降低成形载荷,最大锻造压力均可控制在300MN以内,局部加载2个道次较适合超大规格航空模锻件生产;各道次成形过程锻件温度场均匀,平均等效应变值达到3.6,锻件变形充分;第1道次变形量为40%时锻件等效应力分布最均匀,上模所受侧移力最小;总变形量为55%、第一道次取40%,第2道次取15%时是该锻件等温局部加载最优变形工艺。
The process scheme of partial loading forming for large size aluminum alloy die forging was proposed. The three-dimensional finite element software Deform-3D was used to analyze the load distribution and deformation uniformity of the forging section. The results show that the local isothermal loading process of large forgings can effectively reduce the forming load, the maximum forging pressure can be controlled within 300MN, the partial loading of 2 passes is more suitable for the production of oversize air forging. The temperature field of forgings is uniform during each pass, The average equivalent strain value reached 3.6, the deformation of the forging was sufficient; the equivalent stress distribution of the forging was the most uniform when the deformation was 40% for the first pass, and the lateral force was the least for the upper die; the total deformation was 55% Take 40%, take the second pass 15% when the forging isothermal partial loading optimal deformation process.