航空学报 > 1987, Vol. 8 Issue (8): 406-415

用刚粘塑性有限元法分析叶片精锻时的金属流动和变形组织

连建民, 李训悌, 李成功   

  1. 北京航空材料研究所
  • 收稿日期:1986-11-13 修回日期:1900-01-01 出版日期:1987-08-25 发布日期:1987-08-25

ANALYSES OF METAL FLOW AND STRUCTURE IN BLADE PRECISION FORGING BY RIGID-VISCOPLASTIC FINITE ELEMENT METHOD

Lian Jianmin,Li Xunti, Li Chenggong   

  1. Beijing Institute of Aeronautical Materials
  • Received:1986-11-13 Revised:1900-01-01 Online:1987-08-25 Published:1987-08-25

摘要: 本文依据现行生产的某航空发动机压气机二级叶片的有关数据,采用刚粘塑性有限元法对叶身截面的成形过程进行了模拟,得到了纯铅和TC4钛合金两种材料在不同工艺条件下的金属流动和应变分布的规律,讨论了摩擦条件和毛边桥尺寸对金属流动的影响比较了锻件内不同区域的应变量所对应的组织。计算网格与实验网格比较基本吻合。

Abstract: The blade precision forging is one of the advanced techniques in modern metalworking process.It is very important to investigate the metal deformation behaviors in detail.According to the production data, the forming process of the blade cross-section is simulated by rigid-viscoplastic finite element me-thod(RVPFEA).The material flow and effective strain distribution are obtained under different friction and tool velocity conditions for the rate sensitive mateials Pb and Ti-6AI-4V, respectively.The effects of friction and flash land on material flow are discussed.The structure are compared with effective strain for different locations in forging.The results show that the simulations by rigid-viscoplastic finite element method can describe distinctly the whole process of blade forging and provide a great deal of information for forging preform design and prediction of defect formation and location.The meshes drawn by computer are in good agreement with the results of experiments. For the complicated boundary conditions in blade forging, some methods are given to treat arbitrarily shaped dies and complex fractional conditions in implement of FEM.The calculation shows that the program can be widely used to analyse the metalforming processes.