Large Monolithic Components Milling Deformation Studies

State plans for medium and long-term development thinks the direction of advanced manufacturing technologies in future as informationization, green, extreme. The research uses the method of theoretical studies combined with finite element emulation. The analysis of the machining distortion of the large monolithic components was finished in this paper. It is studied that the effects of initial residual stress on machining deformation, the deformation of the big rectangular thin plate supported by points under gravity, the predict of the machining distortion of the large monolithic components.The first chapter expatiates the correlative background and significance of this thesis. The deformation characteristics and cause of the large monolithic components are studied. It details the situations both in China and abroad. Finally, it states the research topic.The second chapter studied and summarized layer-stripping, summarized the general formula of residual stress and deformation, studied the effects of the related variables on machining deformation by the general program.The third chapter applied the deforming theory of small deflection based on two-dimensional Fourier series and superposition method to the machining distortion of the large monolithic components, linked to the finite element method, established the model of the big rectangular thin plate supported by points under gravity. It priorities to address the following issues:1) The effects of the related variables on machining deformation is studied based on the established model.2) Establish the relationship between the dimensions and material of workpiece as well as the location of the support points and the deformation of the workpiece; 3) Establish the relationship between the dimensions and material of workpiece as well as the number of the support points and the best location of support point;4) Based on the theory of small deflection combined with the finite element method, gives advice about the span of supports;5) In view of the support situation of all curve surfaces, advances the way to the support of all curve surfaces on the base of research on the related literature.The fourth:The simulation model of the milling process was built, unlike previous the simulation model of the restarting analysis. The effects of the four most common processing path(ring from inside to outside, ring from outside to inside, abreast, zigzag) on machining deformation was studied. Base on the model, It is studied that the effects of gravity and supported points on machining deformation. The monolithic components usually have many frames. This paper takes a monolithic component with three frames and six frames as research subject. The effects of the milling machining sequences on machining deformation was studied.The fifth:Finally it summarizes the whole research work as well as the prospect of the project, and points out some features that need improved.