Abstract:

：Aeronautical monolithic component would be distortion in the process of milling due to the initial residual stress redistribution and structural stiffness evolution for the material removal. In this research, finite element modeling of machining distortion is established by the life and death technology, and the deformation law is got for material removal. The structural stiffness of aeronautical monolithic component is calculated based on the equivalent bending strain energy method. Combining with the characteristics of residual stress and stiffness evolution, machining additional torque model of material removal is established. The machining distortion of the frame workpiece is forecasted by the machining deformation mathematical model. The result obtain from FEM model agrees well with that from mathematical model, and the results show that deformation characteristics and the initial stress state of the removing material are consistent.

Key words: machining deformation, mathematical model, residual stress, stiffness evolution, equivalent strain energy