Research On Milling Stress And Deformation Of Heavy Vehicle Frame

Heavy vehicles have very important applications in national defense、industry and other fields. Themilling deformation of its frame has a significant impact on overall qualities of vehicles. It is onemain reason affecting vehicle frame yield. Milling residual stress and deformation of welding heavyvehicle frame were studied to controll the milling deformation using finite element simulation andexperiment. The main work and the achievements accomplished are listed as following:1. Milling residual stress and deformation principles in the role of single factor welding residualstress were studied. The milling finite element modeling of welding workpiece was established. Theoriginal residual stress suggested in the milling finite element analysis was obtained by usingminimum welding residual stress. The milling residual stress and deformation of welding workpiecewere gained. Residual stress release and redistribution and milling deformation were analyzed.2. Milling residual stress and deformation principles in the role of multi-factor coupling wereinvestigated. The milling process parameters were optimized. The milling force for optimization wasgained in the experiment which was taken as an original condition. The milling residual stress anddeformation were gained in the role of original residual stress, welding residual stress, milling force,milling temperature and tooling conditions. The principles of the milling residual stress anddeformation in the role of multi-factor coupling were analyzed.3. Milling residual stress and deformation principles of different sizes milling groove workpiece inthe role of single factor and multi-factor coupling were studied. The milling residual stress anddeformation were gained. The principles of residual stress and deformation were analyzed in the roleof single factor and multi-factor coupling. The validity of this model was proved by milling stress anddeformation measurement experiment of welding workpiece. The measurement of controlling heavyvehicle frame milling deformation was proposed on the basis of workpiece research. Heavy vehicleframe was milled using optimized milling process parameters and method of welding ribs. Thesatisfactory result was gained.