Abstract: Python scripting language was used in pre-processing module of ABAQUS for secondary development,through loading the force on the milling region,the data of machining deformation cause by milling error were obtained.Based on the mechanical model,accurate modeling of R cutter milling force was established on the basis of considering the shear effect of the rake face and the ploughing effect of the flank face.The simulation results were in accord with the milling error of actual processing,the milling force model and the simulation method were proved applicable for the milling error predict of the casing,the research results provided theoretical guidance for tooling design of such parts.

Key words: casing, milling error, milling force model, R milling cutter, secondary development of ABAQUS