Abstract
The formation of hydrodynamic lubrication is analyzed based on an experimental study of the hydrodynamic lubrication characteristics between two parallel surfaces with different types of surface texturing. The study considers planar samples of C45 steel and accounts for the thermal expansion of 304 stainless steel in the experimental apparatus at oil temperatures of 323.15 K and 353.15 K. The experiments involve the use of a rotating rheometer at various angular speeds, with the effect of thermal expansion that occurs in actual applications being simulated by varying the gap between the planar sample surfaces. The experimental results show that (i) the lubrication properties of the planar textured samples depend strongly on temperature and (ii) the load-carrying capacity of the textured samples is considerably greater than that of the non-textured samples.
Highlights
Hydraulic technology has been integrated indispensably in today’s mechanical and electrical products, such as mechanical arms, robots, heavy-duty machinery, and high-precision control equipment, all of which involve hydraulic components and systems
Studies show that surface texturing can act as an oil reservoir and entrap wear debris13,14 and, since the introduction of surface topography, studies have focused on how surface morphology affects hydraulic performance
Surface texturing consisted of grating pairs, with each member of the grating pair oriented at 30○, 45○, 60○, or 90○ with respect to the other to form a rhombohedral grid
Summary
Hydraulic technology has been integrated indispensably in today’s mechanical and electrical products, such as mechanical arms, robots, heavy-duty machinery, and high-precision control equipment, all of which involve hydraulic components and systems. To improve the lubrication between surfaces and thereby reducing friction and wear, surface topography is used widely on parts such as piston rings, bearings, and mechanical seals in various equipment. Friction between surfaces is related to the topographical parameters of the surface texturing and to the lubrication conditions and contact shapes, which can lead to varying lubrication performance for a given type of surface texturing. The present investigation considers planar samples with partial surface texturing in comparative experiments in which the temperature is varied. These experiments involve planar, textured surfaces separated by a controlled gap with full lubrication between the surfaces. The experiments allow us to compare the LCC of pairs of planar surfaces with various textures and with different oil temperatures
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