Reaserch On Deformation Method Of Aerospace Thin-walled Structures

Lightweight alloy material are spacecraft model defense equipment and advanced aircraft to achieve high performance, high reliability and low cost basis and guarantee. Starting in the 1980 s, along with the rapid development of high and new technology and national defense equipment industry’s rapid development, the contemporary lightweight alloy material properties and manufacturing process put forward higher requirements, but also brings new opportunities for development. Especially for aluminum alloy materials in aerospace, shipbuilding, nuclear industry and the weapons industry has a broad application background and irreplaceable position, thus the related manufacturing technology of aluminum alloy become the basis for the development of defense scienceand key technology.First this paper describes the process of aerospace thin-walled components machining deformation mechanism and research status,summed up the main causes of thin-walled components machining deformation. According to the aviation thin-walled member heterogeneous characteristics and many practical production experience further summarizes the thin-walled components machining deformation processing difficulties,control method of this kind of parts.Secondly from the initial factory aluminum alloy materials studies should be carried out in stress state,to study the pre-paration process of pre stretched aluminumalloy sheet in the formation process of residual stress. Based on the elastic-plastic theory, the establishment of the initial residual stress release of stress and strain in the process of the model. Using the layer stripping experiment,an alyzed the distribution to obtain the material residual stress. And finite element simulation of the process of experiment,verified the stress-strain model.Thirdly using the ABAQUS finite element analysis software,through the optimization of material constitutive model the material failure criteria,rational division of grid parameters,using the element birth and death technology established the finite element simulation model of milling process. Through the analysis for simulation calculation results are consistent with the actual milling process situation, further verify the validity of the finite element model and the effectiveness. Adhering to the above method, and further optimize the finite element simulation model parameters involved, in order to achieve the best purpose simulation effect optimal operation and time consuming, to lay the technical foundation for subsequent processing deformation research.Framework in the end, for a specific aircraft thin-wall parts coupling multiple factors to establish finite element model of machining process simulation of the thin-walled structure from blank to the entire process of molding, milling process all the workers get such components step transient state of deformation, and USES the three coordinate measuring machine for the machining surface of orthogonal detection network, so as to verify the consistency of finite element simulation results with the experimental measurement results. This method can predict the milling thin-walled components deformation, can advance correction and control of machining deformation in new ways.