| Popis: |
This paper proposes a rough surface micro-contact method to investigate the contact characteristics of the interface between the outer surface of in machine tool main spindle and the interference connection of the inner ring surface of a bearing. Based on the measured data of real rough surface, a contact model between the single micro-convex body and the rigid surface is established, and the variation rules of the micro-convex deformation and the normal contact stiffness on the whole contact interface are analyzed in the stages of elastic deformation, elastic-plastic deformation and full-plastic deformation. The relationship between the contact stiffness of the micro-convex body and the macro-overrun of the interface between the spindle rough elastic surface and the bearing rigid inner ring surface interference connection is modeled by the mathematical relationship between the macro-overrun and the separation distance between these surfaces. It is found that, throughout the contact process, different ranges the interference amount can cause different forms of deformation of the micro-convex body at the contact interface, and the contact stiffness grows nonlinearly with the increase of interference amount. Finally, the finite element results are used to verify that the contact stress between the rough surface micro-convex body and the rigid smooth surface on the unit contact area shows a nonlinear increase as the interference gradually rises, which indirectly proves the correctness of the derived model describing the relationship between the contact stiffness of the micro-convex body and the macroscopic interference the full contact domain , and provides theoretical support for the rational selection of assembly design parameters at multiple scales. |
