Experimental study and numerical simulation of isothermal closed die forging for aluminium alloy rotor
(1.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China2.黑龙江省哈尔滨市哈尔滨工业大学材料科学与工程学院)
Abstract: The closed die forging(or fully-enclosed die forging) method was employed to form a rotor instead of the conventional machining method. A combined female die was designed so that the rotor could be released easily from the female die after forging. In order to improve the metal flow ability, the isothermal forming technique was introduced to the closed die forging process. On the basis of the rigid-viscoplastic FEM principle, the DEFORM 3D software package was employed to simulate the forming process. The simulation results illustrate that the deformation of different part of the billet is not the same. The material near the entrance of the die cavity is deformed greatly whose strain rate and strain are both large, while the deformation of the material at the billet center is much smaller.
Key words: aluminium alloy； rotor； precision forging； closed die forging； isothermal forming； rigid-viscoplastic FEM