Reliability Analysis Of Machining Accuracy And Optimal Compensation Of Machining Error For The Thin-plate Part

The thin-plate part has outstanding characteristics such as thin thickness,lightweight,and high strength,which is widely used in high-tech fields such as automobile and intelligent agricultural equipment.However,it is precise that these parts have low cutting rigidity because of the thin thickness.During the machining process,the workpiece is extremely prone to deformation,resulting in large machining errors,resulting in an uneven thickness of the workpiece,and even out-of-dimension,thereby reducing the performance and service life of the product.Therefore,it's of great significance to study the method of optimizing and controlling the processing error for the thin-plate part.This paper researches the aspects of rapid prediction of processing deformation of thin-plate parts,reliability analysis of processing accuracy,optimization design of process parameters,and compensation of machining errors based on the combination of Finite element simulation calculation and experimental research.Firstly,the prediction method of processing deformation of the thin-plate part is studied.The deformation mechanism in the milling process of the thin-plate part is analyzed,and the machining process is simulated based on the Finite element method to obtain the simulation data.Gaussian process regression prediction model was established by using simulation data to realize the rapid prediction of processing deformation.Based on this,the influence of process parameters on processing deformation was analyzed.Secondly,the reliability analysis method of machining accuracy of the thin-plate part is studied.Considering the processing deformation of thin-plate parts and the motion error of the machine tool,the machining error of thin-plate parts is deduced.Based on this,the reliability model of the machining accuracy of thin plate parts is established,and then the time-varying reliability analysis method is used to solve the model.Case study indicates that the machining deformation of the workpiece is an important factor that affects the reliability of the machining accuracy of thin-plate parts.Then,the processing parameters optimization and processing error compensation method of thin-plate parts is studied.On the one hand,an optimization model with average processing deformation and processing time as the goal,process parameters as optimization variables,and the expected minimum processing accuracy reliability as the constraint is established,and the optimal process parameter combination that meets the expected processing accuracy is obtained,which reduces the amount of processing deformation so that the processing error can be optimally controlled.On the other hand,the machining error compensation mechanism of thin plate parts is analyzed,and the direct compensation and iterative compensation method are used to compensate for the machining error to further reduce the machining error.Finally,a rapid prediction and processing error compensation system for thin-plate parts processing deformation was designed.The system includes many functions,such as simulation of processing deformation,rapid prediction of processing deformation,reliability analysis of processing accuracy,optimization of process parameters,and calculation of processing error compensation,which realizes the practical application of theoretical methods.