Abstract:Aiming at the machining deformation problem of thinwalled frame parts when milling at different positions of the sidewalls，a static milling force prediction model is established through the empirical formula of end milling.By using ANSYS workbench finite element software and the actual milling processing parameters，multiple sets of simulation experiments are designed，and the deformation law of each sidewall under a given predicted milling force is studied through control variable method.The results show that the smallest the deformation exists in the fixed constraint end while the largest deflection deformation exists in the middle of the free end，and the law of effect of structural parameters such as aspect ratio，wall thickness and material of the part on the milling deformation changes.Finally，countermeasures are put forward，which provide a theoretical basis and an empirical support for the study of complex multiframe thinwalled parts.