Study on the effect of oil supply on the friction state of the micro-texture surface of sliding guide

Abstract

Abstract To investigate the law and mechanism of the effect of oil supply (initial oil film thickness) on the friction state of the micro-texture surface of the sliding guide. The friction and wear experiment of pin-slider surface contact is carried out to study the influence law of initial oil film thickness on friction coefficient, contact surface temperature, and lubrication state at different velocities. This experiment reveals the wear mechanism of the micro-texture surface under different initial oil film thickness, and establishes the lubrication state control model of the micro-texture surface. The results show that the velocity and initial oil film thickness have a more significant effect on the friction properties of the micro-texture surface. When the velocity is less than 0.06 m/s, the contact surface has been in the semi-dry friction state with the initial oil film thickness increases, the COF decreases by up to 13.32%, and the micro-textured surface produces abrasive wear, adhesive wear, and fatigue wear. When the velocity is more significant than 0.06 m/s, as the initial oil film thickness increases, the contact surface transits from the semi-dry friction state to the boundary lubrication state, and the COF decreases by up to 44.96%. When the velocity increases to 0.18 m/s and the initial oil film thickness is more significant than 19.8 µm, the micro-texture has a hydrodynamic pressure effect and the contact surface in the mixed lubrication state. The wear surface of the micro-texture has only slight abrasive wear, and the COF decreases by 64.07% at the highest. The study lays the theoretical foundation for the control of the lubrication state of the sliding guide surface to improve the sliding guide motion accuracy and service life.