Research And Application On Key Technology For High Quality And Efficiency Manufacturing Of Complex Thin-walled Part

In recent years,thin-wall parts have a wide range of applications in industries of aerospace and precision instrument because of its light weight,high strength,toughness and compact structure.However,its complex structure,high shape and position precision requirements result in the manufacturing problem,which is processing deformation.During all the factors affect deformation,processing method is the key factor influencing processing quality.Complex thin-walled parts whit low rigid,which is widely used in aerospace engineering,is studied in this paper.we do the research on tool path,processing order and clamping schemes involved in the processing plan.First of all,the milling finite element model was established according to the metal milling mechanism,the elastic-plastic three-dimensional finite element technique,element birth and death technology and dynamic load step are applied in the model.Then,the influence of tool path,processing order and clamping schemes to processing quality and efficiency were studied through finite element model which is established.Especially the research on processing order,it shows that order processing of features not only affects shape and position precision of those features will also have influence on the machined features,so processing order arrangement is necessary to consider for complex thin-walled part which is difficult to manufacture.At last,considering the object of minimizing the process deformation and based on analyzing the process stiffness of thin-walled parts,a general approach was proposed to optimize the processing order,which is efficient and has a wide generality.This method not only solves the issue of characteristic arrangements,but also provides a reference to determine the processing.