Abstract
Because of the low viscosity of high-water-based fluids, the intense wear and leakage of key friction pairs represent a bottleneck to the wide application of the high-water-based hydraulic motor in engineering machinery. In this work, based on the common characteristics of plane friction pairs, the friction experiments of a 316L stainless steel (316L)–polytetrafluoroethylene (PTFE) friction pair under various working condition were carried out by a self-designed friction experimental system with fluid lubrication. The influence of lubrication pressure and surface morphology on the 316L–PTFE friction pair was investigated both experimentally and theoretically. The experimental and numerical results indicated that increasing lubrication pressure reduced the surface wear of PTFE sample, but the leakage of 316L–PTFE friction pair also increased. It could not form an effective fluid lubrication film in the 316L–PTFE friction pair under low lubrication pressure, which caused the severe wear in friction pair interface. The smooth 316L surface could be conducive to the formation of high-water-based fluid lubrication film in 316L–PTFE friction interface. The pressure distribution of high-water-based fluid lubrication film in 316L–PTFE friction pair was also obtained in fluent. The PTFE surface was easily worn when the lubrication film in the friction pair was too thin or uneven. The friction and wear were obviously improved when the normal load was balanced by the bearing capacity of the high-water-based fluid lubrication film.
Highlights
Because of the special physical and chemistry properties of high-water-based fluids, the lubrication of the key friction pair was the most important technology in the development of the high-water-based hydraulic motor/pump, which significantly affected its work efficiency, performance, and service life.The poor lubrication, intense wear, and large leakage of key friction pairs in the high-water-based fluid were the bottleneck of high-water-based hydraulic motor/pump’s wider application in mining engineering, ocean engineering, and other industries [1,2]
A new high-water-based radial piston motor with distribution valve groups was introduced by Qiu et al, and the friction mechanism and materials matching the slipper-crankshaft pair were investigated in a high-water-based fluid, which observed the matching of GIC coating and PEEK-30CF with more stable tribological properties [2,9]
For obtaining the suitable material matching of flow distribution plate and rotor in low-speed inner curve water hydraulic motor, Wang et al investigated the tribological behavior of various materials in a seawater environment by a ring-on-disc test rig, but the lubrication film pressure in the friction interface was not taken into consideration in the experiments [10,11]
Summary
Because of the special physical and chemistry properties of high-water-based fluids, the lubrication of the key friction pair was the most important technology in the development of the high-water-based hydraulic motor/pump, which significantly affected its work efficiency, performance, and service life. For obtaining the suitable material matching of flow distribution plate and rotor in low-speed inner curve water hydraulic motor, Wang et al investigated the tribological behavior of various materials (including composite materials and corrosion resistant alloy) in a seawater environment by a ring-on-disc test rig, but the lubrication film pressure in the friction interface was not taken into consideration in the experiments [10,11]. In the high-water-based hydraulic motor/pump, the key included flow distribution plate friction pair, crankshaft–slipper pair, slipper–swash plate pair, and plunger–cylinder pair, and because of the low viscosity of water, the key friction pairs were more prone to wear and leak. To simulate the wear behavior of friction motor/pump operating at low speed condition, the rotation speed of bottom sample was set to 15 pair in water hydraulic motor/pump operating at low speed condition, the rotation speed of bottom r/min.
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