Research On Processing Deformation Of Aeronautical Integral Structural Parts Based On Stiffness Evolution And Energy Method

With the rapid development of aviation manufacturing industry in contemporary society,the accuracy of aviation structure parts is also put forward higher requirements.The bending deformation and torsional deformation of aeronautical integral structural parts are becoming more and more prominent after machining.Due to the deformation of the workpiece after processing,it is impossible to meet the requirements of use.And the production efficiency and the cost are greatly improved.To the aviation manufacturing industry caused the very big trouble.There are many factors that affect the deformation of the whole structure of the air(instance:workpiece material properties,initial residual stress,machining residual stress,temperature change,cutting force cutting heat,process parameters,etc.).At present,it is very rare to analyze the processing and deformation of the whole structural member from the structural rigidity evolution and the energy theory direction for the research of the processing and deformation of the whole structure of the air.In this paper,the evolution of the stiffness of the structural member and the energy-based approach are used to study the processing and deformation of the whole structure.Based on the 7050-7451 aluminum alloy as the research material,the deformation mechanism of the whole structure of the aluminum alloy was studied.The main research content is the evolution and theoretical modeling of stiffness in the machining process of frame structural parts,and based on the energy method,the deformation law of structural parts is analyzed,and the machining strategy of aeronautical frame parts is analyzed based on the minimum deformation.(1)The stiffness theoretical calculation and finite element simulation analysis of7050-T7451 aluminum alloy sheet are carried out.The theoretical stiffness of aluminum alloy sheet is calculated by theory.Then the stiffness evolution of structural parts is studied from three aspects,which are the influence of different positions on the stiffness of structural members,the influence of the layer-by-layer removal of the material on the stiffness of structural members,and the influence of removing frame material one by one on the stiffness of structural members.The influence of different position frame and different material removal methods on the stiffness of structural parts is analyzed,which provides the basis for the analysis of machining strategy.(2)Analysis of processing deformation of Aeronautical Aluminum Alloy structure based on energy theory.It is considered that the essence of workpiece deformation is energy conversion.Under the reasonable assumption,the strain energy contained in the material is calculated according to the energy conservation law.By using the strain energy contained in the removal of the material is equal to the bending strain energy contained in the machining of the workpiece,the maximum deformation of the workpiece in the process of removing the frame material from the frame structure is predicted by matlab programming calculation.And finally,the maximum deformation rule of the structural part simulated by the finite element is mutually confirmed.(3)Aiming at the deformation problem of aeronautical integral frame structure parts caused by different processing process sequence,the finite element model of frame integral structure parts caused by initial residual stress is established based on ABAQUS,and the machining deformation law of frame integral structure parts caused by initial residual stress of blank is analyzed.The influence of different machining sequence on the deformation of aeronautical frame structure is studied,and the optimal machining strategy is found.