Research On Regularity Of Precision Forging Of Titanium Alloy Blade Based On Coupled Thermo-mechanical Simulation

A blade is one of the most important and vast scale components in aero-engines and the development of aero-engines depends on the development of material and fabrication process. The process of precision forging of blades with a damper platform is subjected to a large number of factors because of the complex shape of the blade with a damper. At present, there hasn't been effective way to realize the precision forging of the blade with a damper platform systematically in our country. The process of precision forging influences on the structure property,surface quality, shape and size. Besides, it plays an important role on mechanical properties. Therefore, it is important to do some research on the precision forging process by using 3D-FEM numerical simulation. In this thesis, the precision forging process is studied through 3D coupled thermo-mechanical finite element numerical simulation. And the research has great theoretical significances and practical values for the development of the fabrication and the technology of a blade with a damper platform. A brief introduction to the project and its main results are as follows:(1) 3D models were created by using Pro/ENGINEER. Several parameters of the forging die—the equilibrium angle, the rough edge and the parting line—are designed. And the model of a blade with a damper platform and precision forging dies are created.(2) Some key technologies have been solved through DEFORM software, such as materials modeling, meshing, contact boundary, friction, selection of iteration solver and increment step, etc. These make the simulation a trouble-free operation. At the same time the accuracy of the simulation is ensured.(3) Based on the platform of finite element software DEFORM-3D, the preforging 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 loading curves vs. stroke have been obtained, and the regularity of preforging process of the blade with a damper platform have been revealed.(4) The influence of main process parameters on strain rate field, temperature field and time-stroke curve have been disclosed in the finish-forging process, including die velocity, friction factor and preheating temperature of dies. The results show that: temperature and strain will increase as the die velocity, friction factor and dies preheating temperature rise. Technical parameters' optimization values are as follows: die velocity is 15-25mm/s, friction factor is 0.05-0.1, preheating temperature of dies is 150-300℃. The results have great sense for selecting the technology parameters of the precision forging process of the blade with a damper platform.