Research On Structural Optimization And Process Planning Of Aircraft Bearing Bracket For Hybrid Additive And Subtractive Manufacturing

The aircraft bearing bracket is one of the most important components of the aviation equipment products.Although the weight of the bracket is relatively light compared to the total weight of the aeronautical equipment.The bracket is an important part of the whole structure of aviation equipment,the same kind of bracket will be used in large quantities on the same aviation equipment,so its quality control is particularly important.The weight reduction of each series of bracket will bring economic benefits and performance improvement to the aviation equipment.At the same time,machining accuracy and surface quality are also important factors affecting the performance of aircraft bearing bracket.However,in the actual production process,there are many factors that restrict each other between lightweight design and high-precision manufacturing process of aircraft bearing bracket.In view of the above problems,the hybrid additive and subtractive manufacturing is selected to process the aircraft bearing bracket in this thesis.Topology optimization is adopted to design a lightweight aircraft bearing bracket,and the finite element method is used to analyze and explore the processing parameters.Combined with the finite element analysis results of different processing parameters,the process planning of the aircraft bearing bracket is carried out.The specific research contents of this paper are as follows:(1)The finite element model of the aircraft bearing bracket is established and topologically optimized.In view of the requirements of manufacturability and practical use,the optimized aircraft bearing bracket is carried out the secondary structure design and model reconstruction.The finite element method is used to check the reconstructed model to ensure that the final designed parts could meet the use requirements.And the machine structure,tool type,nozzle angle,cutting path and deposition path suitable for machining aircraft bearing brackets are determined.(2)The thermal mechanical coupling milling simulation for cutting processing is carried out to guide the reasonable selection of finishing parameters in the subsequent process planning.The simulation results are verified by experiments to obtain the influence law of different cutting parameters on machining deformation.The change of temperature field distribution in additive manufacturing process is simulated,the selection range of additive manufacturing processing parameters is determined,and the influence of different parameters on the processing results is analyzed.(3)Considering comprehensively the material utilization rate,processing accuracy,processing efficiency,processability and other factors in the machining process of aircraft bearing bracket,the procedure arrangement and process planning of hybrid manufacturing for aircraft bearing bracket is carried out.