The Finite Element Analysis Of Numerical Control Machining To Thin-walled Parts

In order to control the deformation of thin-walled parts in cutting processing effectively, and enhance the assembly performance. The thin-walled parts are studied with finite-element analysis.The most important factor which influences the deformation of thin-walled part is residual stress. The main reason of the residual stress are cutting force and cutting heat which cause the thermoplastic deformation.Through analyzing the structure and characteristics of the commonly used air thin-walled, the part’s structure which is studied in this paper were determined. The theory of the residual stress on deformation was analyzed. The calculation of cutting force and the influencing factors was studied, and the principle of peripheral milling was expounded. The metal cutting is a strongly coupled thermal-mechanical process on the principle of metal cutting. The Johnson-Cook constitutive model, failure rule of separation, friction model, and local grid partition is the main finite element simulation theories.The two-dimensional cutting of thin-walled part was simulated by explicit dynamic module of ABAQUS. Stress field, strain field, temperature field, and chip forming process were analyzed during the forming processing.The peripheral milling was evolved into three-dimensional oblique cutting of variable thickness. The cutting force and cutting temperature distribution were analyzed in detail, and the chip formation process is simulated. The result verifies the authenticity of the simulation.The three-dimensional milling model was established by ABAQUS. The whole process of side milling was simulated, and the scope of the residual stress distribution was determined. The residual stress distribution of the nodes and the surface residual stress distribution graph were studied in a certain range of x, y, z direction along the width direction on the part surface. The temperature change rule on tool tip position and the machined part surface were analyzed. Finally, the method of reducing the part deformation was discussed from the cutting depth, cutting speed, feeding rate and feeding path.