Hydrodynamic Lubrication and Load Carrying Capacity Analysis of Laser Surface Texturing Valve Core

Abstract

Take water hydraulic slide valve core as the research object. Laser surface texturing (LST) technology was used to improve the valve core carrying capacity and hydrodynamic lubrication characteristics, which can process micro-texture on the surface of the core. And CFD method was taken to calculate flow field of smooth and laser surface texturing core respectively. For studying the influence of valve core micro-texture and valve core overlap lengths on hydrodynamic lubrication characteristic and carrying capacity of the core, core surface pressure distribution, surface pressure and friction force curves were drawn. Results show: The smooth valve core does not produce hydrodynamic lubrication effect, but textured valve core can bring the oil film load capacity, so as to make the effect of mixed friction between valve core and sleeve weaken. And along with the decrease of the core overlap length, the carrying capacity on the surface of the textured valve core does not decrease but increase when the valve core overlap length amount is greater than 2.5mm.The results provide important theoretical reference of studying and applying LST process technology to the valve core friction pair’s lubrication performance.

Research on the Controllable Interface Response Enhancement of the Textured Pilot Valve

“…When one area is processed, the valve core needs to rotate 12° to make the next area, until the texture is fully processed. Relevant studies [27] show that the friction coefficient is the minimum when the texture diameter is d = 300 μm and the depth h = 40 μm. A rhomboid texture with side length l = 300 μm, depth h = 40 μm and angle α = 90° between two adjacent sides is designed.…”

“…After smoothing the measured signal curve, Δx, Q, and P dynamic characteristic curves are obtained. The influence of textured Relevant studies [27] show that the friction coefficient is the minimum when the texture diameter is d = 300 µm and the depth h = 40 µm. A rhomboid texture with side length l = 300 µm, depth h = 40 µm and angle α = 90 • between two adjacent sides is designed.…”

“…When one area is processed, the valve to rotate 12° to make the next area, until the texture is fully processed. Relevant studies [27] show that the friction coefficient is the minimum wh ture diameter is d = 300 μm and the depth h = 40 μm. A rhomboid texture with l = 300 μm, depth h = 40 μm and angle α = 90° between two adjacent sides is de core has five shoulders in direct contact with the sleeve, with a total length of Figure 2 is the schematic diagram of textured surface of pilot valve core.…”