Research of Dynamic Characteristics in Milling of Thin-walled Parts Under Moving Boundary Constraint
In view of the complexity of the workpiece constraint boundary and the difficulty of predicting the dynamic characteristics in the milling of thin-walled parts,the moving contact boundary constraint(MCC)was proposed,and the influence of MCC on the dynamic characteristics of the system was studied in detail.Firstly,a dynamic model for thin plate cutting was established considering the constraint of tool-worker contact moving boundary,and the tool-worker contact region was extracted,and the complex relationship between the contact stiffness and damping force and the contact parameters was analyzed.Secondly,the dynamic response of the thin plate under arbitrary MCC is predicted,and a more comprehensive selection scheme for arbitrary boundary constraints is formed,including contact moving boundary conditions and classical boundary conditions.The kinematic equation of the system is established based on the thin plate theory,and the combination of the energy term generated by MCC,conventional arbitrary boundary constraint and thin plate deformation is considered comprehensively.Finally,a large number of results via numerical,analytical and experimental methods in existing literature are compared with that under different cases and via finite element method to prove the accuracy of the present method.The results show that the effect of the contact movement constraint on the dynamic characteristics of the system cannot be ignored.
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