Abstract
To investigate the influence of surface features, in the form of pits, on the wear resistance of grey cast iron (GCI), a finite element model of the pin-on-disc friction system, with pits distributed in a curved radial direction, was developed using APDL programming and the tribological behavior of textured surfaces was studied. The influence of relative rotation direction between the disc and the pin on the thermal behavior of the friction system under dry wear conditions was researched. GCI and C30E steel samples with pit textured surfaces were manufactured using laser marking equipment and tested using a tribology wear testing rig. The mass losses were measured and the worn surfaces were characterized. The influence of different rotation directions on the tribological behavior of the pit textured surfaces was also investigated. The simulation and test results revealed that rotation direction was a crucial parameter in determining the tribological behavior of surfaces with these features, regardless of the material. Under the conditions tested, when the pin rotated anticlockwise, the samples showed better friction and wear behavior than when the pin rotated clockwise. These results can provide important guidance for the optimization of the design of heavy-load brake systems and other similar applications.
Highlights
Owing to its low cost, good damping property, fine castability, and machinability, grey cast iron (GCI) is widely used in many fields, such as machine tools, vehicle engines, reduction gearboxes, and brake discs of trains [1]
The results indicated that grooves perpendicular or parallel to the sliding direction had a strong impact on the friction performance of
The optimal surface texture parameters obtained in previous research were used, that is, the diameter of pit (DAOP), 0.8 mm, and the depth of pit (DPOP), 1.0 mm [24]
Summary
Owing to its low cost, good damping property, fine castability, and machinability, grey cast iron (GCI) is widely used in many fields, such as machine tools (base and guideways), vehicle engines (shell and cylinders), reduction gearboxes (shell), and brake discs of trains [1]. Surface texturing is one of the main methods to control friction, improve the reliability, and prolong the service life of mechanical parts in sliding wear applications [3,4,5,6,7,8]. To improve the wear resistance of mechanical parts, great efforts have been theoretically and experimentally made to investigate the orientation effects between frictional motion direction and surface texture units or patterns, on the tribological behavior under different lubrication conditions [18,19,20,21,22,23]. The results indicated that grooves perpendicular or parallel to the sliding direction had a strong impact on the friction performance of
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