| The processing and deformation of the aerospacestructures have become a shortcoming in the development,design and manufacturing of new models of aircraft.The uneven distribution of initial residual stresses in the blanks,the randomness of the process characteristics of large-scale components,and the lack of processing and manufacturing technology have caused aviation structural parts.The core factor of processing deformation.In recent years,with the implementation of the strategy of material localization,more serious and complicated processing deformation problems have appeared in the process of blank processing,which severely restricts the quality and efficiency of structural parts processing.Based on the summary of the factors affecting the processing deformation of the overall structure(machine tool rigidity,tool specifications,tooling methods,cutting conditions,etc.),this paper summarizes the research status of structure processing and clamping methods,processing deformation simulation technology,and deformation control strategies.Design and develop a reconfigurable anti-deformation clamping unit.Propose a processing mode in which the posture of the part can be reconstructed,the clamping state of the part can be adjusted,and the displacement or force constraint can be applied for anti-deformation compensation in the machining gap,and the functional modules of the reconfigurable anti-deformation clamping are designed,mainly including:positioning module,Reconfigurable module,auxiliary support module design,example design of reconfigurable anti-deformation clamping unit is given,which provides hardware support for anti-deformation active compensation during processing.Reliability analysis of the reconfigurable anti-deformation clamping unit.The designed reconfigurable anti-deformation clamping unit is statically analyzed,mainly including the analysis of the force of the workpiece,the analysis of the locking mechanism,the analysis of the force of the flange connection bolt,and then the method of combining the experiment and the finite element simulation The structural modal analysis was carried out,and finally the static loading stiffness test of the reconfigurable anti-deformation clamping unit was carried out,and the feasibility of the design of the reconfigurable anti-deformation clamping unit was verified from various aspects.The stress inheritance method is proposed.Using FORTRAN and PYTHON language to carry out secondary development of ABAQUS,put forward a "multi-step"material removal method based on stress genetic algorithm,write stress genetic inheritance algorithm and interface program with ABAQUS,call finite element software engineering simulation simulation analysis,realize more Simulation technology in line with the actual machining process.Propose an active compensation strategy based on displacement control,and combine the "multi-step" numerical simulation technology to analyze the processing deformation of the structural parts.Based on the finite element simulation deformation data,the minimum processing deformation is the goal,and the processing process is determined based on the optimization algorithm.The processing strategy of the optimal displacement constraint direction and size. |
