FEM Numerical Simulation Research On Forging Process Of Turbine Blade

Turbine blades are core components in turbine, which playing important roles in energy transformation. More and more manufacturer apply hot forging to the produce of blade in accordance with the property needs and produce costs. Blade is complicated in shape and its material is difficult to be deformed, also it is difficult to discover metal forming law in a blade. Therefore, it is significant, for blade forging technology, to study blade forming law by using FEM numerical simulation.The costs of manufacturing blade highly depend on how die service life can be extended. By numerical simulation, a stress field and a temperature field in the die can be grasped and the information such as die failure causes and positions can be found. The corresponding measures would be taken to prolong die service life. Software DEF0RM-3D of SFTC (Scientific Forming Technologies Corporation) is selected as numerical simulation platform in this paper. Furthmore, based on active and convenient control of work flow for user and reaching the target of developing software function, the text -only mode of DEFORM is discussed. A brief introduction to the project is as follow:A numerical simulation for forging process of blade was carried out on platform DEFR0M-3D and the analysis results were obtained, deformation features of blade forging and influence of primary forging temperature were summarized by combining with high temperature plastic deformation principle. By contrast analysis of deformation metal temperature, stress-strain, dynamic hardening and softening properties, blow efficiency and die working condition at primary forging temperature 1100℃,1150℃和1200℃, when the temperature is 1200℃,it is assured that billet metal flowing property is the best, blow times is minimum, influence of thermo-mechanical factors on working condition is nearly same as that when primary forging temperature is 1150℃.The alternant impact of high temperature and high stress on local region of the cavity is one of the main reasons causing die failure. By analyzing the data the position prone to failure was found that locating on the corresponding transition zone between blade body and root, and the suggested measures of preventing die failure were recommended.Application of DEFORM text-only mode based on scripts is researched and discussed. A majority of functions in DEFORM preprocessor can be controlled by corresponding script command. Comparing with GUI mode, according to practical needs, it is convenient for user to develop user routine which could atomically call DEFORM preprocess function module by scripts of text-only modeBlade forging is a completed non-steady plastic forming process, it is effective to analyze blade forming law and die working condition by numerical simulation, which has incomparable advantage relative to traditional methods. Moreover, text-only mode is convenient for controlling DEFORM running and developing user routine. It is practically significant to study the text -only mode of DEFORM.