Thermal Displacement Analysis and Verification for Screw in a Vertical Transmission Double Nut Ball-Screw System
High speed transmission table is wildly used in industry and the demand is increased recently. High speed ball-screw device is a major component in the system. High speed transmission brings high friction and causes serious thermal displacement, especially in vertical transmission situation. Because the external load is become axial load applied on nut directly. Friction and wear became heavier on contact areas between ball and raceways, preload in ball-screw will thus be decreased speedily with operating time. The decrease of preload is also affect thermal rising rate and thermal displacement.The work of this paper is to establish a thermal elastic-viscous hydrodynamic lubrication (EHL) analysing model for friction calculation. Contact and friction forces of each contact area varying with operating conditions of ball-screw can be obtained as boundary conditions of FEM model, and theoretical results were well confirmed with surface temperature and displacement of screw. The aim of the study is useful in understanding thermal effect for a preloaded double nut ball-screw in vertical transmission.
Yunn Lin Hwang
C. C. Wei et al., "Thermal Displacement Analysis and Verification for Screw in a Vertical Transmission Double Nut Ball-Screw System", Applied Mechanics and Materials, Vol. 883, pp. 22-29, 2018