The influences of frictional characteristics of textured surface on rock bit sliding bearing have been investigated through unit experiments where the friction couple was equivalent to a pin-on-disc configuration. Cylindrical and elliptical textures are designed with different sizes, densities ratio and depths, fabricated using precision micro-mechanical engraving. Under the identical testing conditions in which the test force is 430 N and average linear velocity is 0.29 m/s, cylindrical texture with diameter of 300 µm, density ratio of 5.04%, and depth of 40 µm, exhibits lower friction coefficient, temperature rise and wear loss than that of untextured unit specimens. Friction coefficient decreased by 56.3%, similarly temperature rise decreased by 51.9%, and wear loss of textured disc specimens decreased by 52.9%. This study presents that the designed texture with relative small size and density ratio has obvious effect of lubrication and antifriction improvement compared with other specimens which has the same texture depth of 40 µm that it is approximately half of rock bearing radial clearance for rock bit sliding bearing under low-speed and high-load operating conditions.
WangZHuaY. The working conditions and wear mechanism of rock bit sliding bearing. J Southwest Petrol Inst1984; 4: 79–91.
2.
WuKSMaDK. The particularity and major research directions of rock bit sliding bearing. Petrol Machine2001; 29: 52–54.
3.
Wang GR. Research on working mechanism of rock bit floating ring journal bearings. PhD Thesis, Southwest Petroleum Institute, China, 2004.
4.
Wang GR, Wang J and Zhong L. Research on lubrication model of rock bit bearings with Non-Newtonian medium. Online Referencing 2(1), http://www.SciRP.org/journal/mme.com (accessed 8 January 2012).
5.
WuKSMaDK. Optimal design of sliding bearings for roller bit with contact FEA. J Sichuan Univ2003; 35: 16–18.
6.
HuangZLiQZhouY. Experimental research on the surface strengthening technology of roller cone bit bearing based on the failure analysis. Eng Fail Anal2013; 29: 12–26.
7.
SutoYTakahashiH. Effect of the load condition on frictional heat generation and temperature increase within a tri-cone bit during high-temperature formation drilling. Geothermics2011; 40: 267–274.
8.
BlatterAMaillatMPimenovSM. Lubricated sliding performance of laser-patterned sapphire. Wear1999; 232: 226–230.
9.
WangXAdachiKOtsukaK. Optimization of the surface texture for silicon carbide sliding in water. Appl Surf Sci2006; 253(3): 1282–1286.
10.
Nilsson B, Rosen BG, Thomas TR, et al. Oil pockets and surface topography: mechanism of friction reduction. In: Proceedings of the 11th international colloquium on surfaces, Chemnitz, Germany, 2004.
11.
EtsionI. State of the art in laser surface texturing. ASME J Tribol2005; 125: 248–253.
12.
PetterssonUJacobsonS. Influence of surface texture on boundary lubricated sliding contacts. Tribol Int2003; 36: 857–864.
13.
MourierLMazuyerDLubrechtAA. Transient increase of film thickness in micro-textured EHL contacts. Tribol Int2006; 39: 1745–1756.
14.
TanAHChengWS. A novel textured design for hard disk tribology improvement. Tribol Int2006; 39: 506–511.
EtsionI. Improving tribological performance of mechanical components by laser surface texturing. Tribol Lett2004; 17: 733–737.
17.
RameshAAkramWMishraSP. Friction characteristics of microtextured surfaces under mixed and hydrodynamic lubrication. Tribol Int2013; 57: 170–176.
18.
WangXLiuWZhouF. Preliminary investigation of the effect of dimple size on friction in line contacts. Tribol Int2009; 42: 1118–1123.
19.
SuhMChaeYKimS. Effect of geometrical parameters in micro-grooved crosshatch pattern under lubricated sliding friction. Tribol Int2010; 43: 1508–1517.
20.
MishraSPPolycarpouAA. Tribological studies of unpolished laser surface textures under starved lubrication conditions for use in air-conditioning and refrigeration compressors. Tribol Int2011; 44: 1890–1901.
21.
QiuYKhonsariMM. Experimental investigation of tribological performance of laser textured stainless steel rings. Tribol Int2011; 44: 635–644.
22.
KimBChaeYHChoiHS. Effects of surface texturing on the frictional behavior of cast iron surfaces. Tribol Int2014; 70: 128–135.
23.
AmanovAChoISPyounaYS. Micro-dimpled surface by ultrasonic nanocrystal surface modification and its tribological effects. Wear2012; 286: 136–144.
24.
LiKHuYYaoZ. Experimental study of micro dimple fabrication based on laser shock processing. Optics Laser Technol2013; 48: 216–225.
25.
StępieńP. Deterministic and stochastic components of regular surface texture generated by a special grinding process. Wear2011; 271: 514–518.
26.
ScholzSGGriffithsCADimovSS. Manufacturing routes for replicating micro and nano surface structures with bio-mimetic applications. CIRP J Manuf Sci Technol2011; 4: 347–356.
27.
YangBLeeM. Fabrication of honeycomb texture on poly-Si by laser interference and chemical etching. Appl Surf Sci2013; 284: 565–568.
28.
RoyTChoudhuryDBinMA. Fabrication and characterization of micro-dimple array on Al2O3 surfaces by using a micro-tooling. Ceram Int2014; 40: 2381–2388.
29.
TomanikE. Modelling the hydrodynamic support of cylinder bore and piston rings with laser textured surfaces. Tribol Int2013; 59: 90–96.
30.
StempflePPantaleODjilaliT. Evaluation of the real contact area in three-body dry friction by micro-thermal analysis. Tribol Int2010; 43: 1794–1805.
31.
YuHWangXZhouF. Geometric shape effects of surface texture on the generation of hydrodynamic pressure between conformal contacting surfaces. Tribol Lett2010; 37: 123–130.
32.
BaiSXPengXDLiYF. A hydrodynamic laser surface-textured gas mechanical face seal. Tribol Lett2010; 38: 187–194.
33.
Wang X, Yu H and Huang W. Surface texture design for different circumstances. In: Proceedings of the 1st international Brazilian conference on tribology, Rio de Janeiro, Brazil, 24–26 November 2010, pp.97–107.
34.
Syed I and Sarangi M. Influence of texture orientation on the hydrodynamic lubrication. In: Proceedings of the 1st international and 16th national conference on machines and mechanisms (iNaCoMM2013), IIT Roorkee, India, 18–20 December 2013, pp.850–856.
