A New Approach for the Relationship Between the Contact Stiffness and the Interference of Journal and Bearing Shrink-Fitted

Abstract

Shrink-fit connections often experience detachment of the contact surface as speed increases, resulting in a separation distance that determines the interference fit. This study proposes a new approach to investigate the relationship between contact stiffness at the microscale and macroscopic interference in shrink-fit connections between the journal and bearing of high-speed spindles. A model for contact stiffness and macroscopic interference is established, and the results indicate that contact stiffness varies with interference due to the micro-convexity mechanism under compressive deformation. Therefore, the effect of speed should be considered when selecting appropriate interference design parameters. This study provides theoretical evidence to support the selection of optimal interference design parameters at multiple scales.