叶片精锻三维有限元反向模拟脱模准则的确定

叶片精锻过程的预成形设计是提高叶片锻件质量和降低产品成本的一个极其重要的方面,基于有限元法的反向模拟技术能够从叶片终锻件形状反演出预成形毛坯形状。为此,本文介绍了有限元反向模拟的基本步骤,综述了确定反向模拟中边界节点脱模准则的方法。针对叶片精锻三维有限元反向模拟过程,提出用跟踪拟合修正的方法来确定边界节点脱模的时间序列,确定了反向模拟的脱模准则。将所确定的脱模准则应用到叶片精锻三维有限元反向模拟程序中,可得到合理的叶片预成形毛坯形状。

The determination of node releasing criterion in three dimensional finite element backward simulation of blade precision forging

Preform design in precision forging process of blade is very important for improving the blade forging quality and decreasing the production cost.A preform shape can be gained with backward simulation from the final blade forged shape based on FEM.In this paper,the basic steps of finite element backward simulation technique are introduced,and the method of determining the criterion of boundary node releasing from die in backward simulation is summarized.In view of three dimensional backward simulation process of blade precision forging,the track fit revising method is put forward to determine the time sequence of boundary node releasing from die.With the criterion of boundary node releasing from die applied to three dimensional finite element backward simulation of precision forging process of blade,the reasonable preform shape of blade is obtained.