The Research On Precision Forging Laws Of The Blade With A Damper Platform Based On The Coupled Thermo-Mechanical Simulation

A blade with a damper platform, a new kind of blades in aviation engine, is of well vibration resistance and high efficiency. The shape of it is complicated and the material for it is difficult to deform, so the precision forging laws are very complex. By now, there has't been effective way to realize the precision forging of the blade with a damper platform in our country, and researches about precision forging of this kind of blade are on experimental stage. So it is necessary to study thoroughly the precision forging laws of the blade, and to grasp the influence laws that technical parameters act on precision forging forming. Therefore, the 3D coupled thermo-mechanical simulation for the precision forging process of a blade with a damper platform is proceeded, based on the bulk forming software DEF0RM3D in the project. This research has great theoretical significances and practical values for understanding flowing laws of material during the precision forging process of the blade with a damper platform.A brief introduction to the project and its main results are as follows:According to the geometry character of the blade with a damper platform, its precision forging models have been built based on three different FEM moulding methods. After analyzing three moulding results, the precision forging models descripted by FEM mesh have been finally adopted.Based on DEF0RM3D, the implementation means has been studied, by which complicated plastic forming process of the blade with a damper platform has been simulated and analyzed. The key technical problems have been disposed properly, for example: initial contact boundary, friction boundary, heating transferring boundary, iteration convergence control, meshing, and choice of iteration solver. These make the 3D coupled thermo-mechanical simulation go on wheels.The precision forging process of the blade with a damper platform has been simulated and analyzed, the results of whole billet's deformed mesh, velocity field, effective strain field, effective stress field, effective strain velocity field, and curves of load vs. stroke have been obtained, and the laws during precision forging process ofthe blade with a damper platform have been revealed.According to 3D coupled thermo-mechanical simulation results of the blade precision forging under different process parameters, the influence laws that the top die velocity, friction factor and dies preheating temperature act on precision forging process have been studied, and technological parameters' optimizational values have been obtained. Top die velocity is 20mm/s, friction factor is 0.1, and dies preheating temperature is about 250 ℃.