Research And Simulation Of Machining Of The High Precision Sealing Plane Based On Finite Element Analysis

Thin wall parts are widely used in aerospace manufacturing, and each thin wall part has a different structure and manufacturing process. The influence of different cutting parameters on the machining accuracy of thin wall parts is different. In determining the cutting process of thin-walled parts in the above problems, the present technological process is still using the traditional methods, that including trial cutting method and empirical parameter. The production efficiency is low in using the traditional method, and it is difficult to guarantee the machining precision of the thin wall parts. Therefore, theoretical study on machining deformation mechanism and control of machining deformation of thin wall parts in aerospace applications, and simulated experiment of measures will greatly improve the actual processing technology, the machining precision and the production efficiency of aerospace thin-walled parts process.Therefore, On the basis of analyzing the characteristics of the thin wall structure of aircraft and the key parts of the fuel injection system, taking high precision holes in aero engine fuel pumps in the sealing surface as the main research object, this thesis analyzes the influence of cutting parameters on the machining quality of the sealing surface of the thin wall parts.(1) According to the basic requirements of the thin wall parts and the finite element simulation analysis requirements, this thesis analyzes the main cutting parameters which affect the machining precision, and preliminarily determine the selection of the cutting parameters.(2) In accordance with the requirements, a more realistic three-dimensional finite element model of milling process is built, and then finite element model parameters is defined to obtain the deformation of the work-piece, the distribution of residual stress and size of cutting forces.(3) Simulation results are dealt with based on the principle of 3σ coring to get each cutting machining deformation parameter size, and then dimensional accuracy, roughness and flatness formulas are used to calculate data for each of the parameters and analyze the influence of each effect of cutting parameters.(4) Based on genetic algorithm and Matlab programming, cutting parameters are calculated using iterative optimization methods. From the perspective of process system, a reasonable and feasible method of control and process measures are made to satisfy the drawing precision requirement.