Surface topography of operated slide journal micro - bearings used in computer fans

• Autorzy: Miszczak A. , Czaban A. , Labuda W.
• Języki publikacji: EN

Abstrakty

EN

In this paper authors present results of measurements of slide journal bearings surface topography measured with a profilometer and an atomic force microscope (AFM). Surface topography of investigated bearings (i.e. journals and sleeves) was measured using the Hommeltester T8000- R60 profilometer. The results of these measurements give information about micro-grooves dimensions and location. Measurements of surface topography were made for journals and sleeves of slide journal micro-bearings from personal computers fans, with the Atomic Force Microscope NT-206 produced in MTM in Minsk, Republic of Belarus. The results of measurements of surface topography were presented in the form of surface topography maps, threedimensional graphs and some examples of selected cross-sections of investigated surfaces in the form of profile graphs. The values of profile roughness parameters Ra and Rq and the distance between maximum peak height and maximum valley depth are presented as well. The application SurfaceXplorer registered trademark was used for processing and visualization of the data obtained from AFM NT-206, which besides from generating 2D, 3D and profile diagrams, was used to calculate and draw graphs of height distribution. In this research authors used two identical sets of micro-bearings. The investigated bearings are: a) Kama Flow SP0825FDB12H fan with grooved surface of bearing sleeve, b) Xilence Case fan which sleeve surface was without grooves. First set of that micro-bearings functioned for a year at rated RPM continuously (i.e. 24 hours a day). Second set of the same micro-bearings also functioned for a year at rated RPM, but in intermittent mode (i.e. 15 minutes on, 15 minutes off). On the surfaces of studied micro-bearings some microgrooves can be found in form of herringbone, with depth about 1-2..m and width 100-150..m. Received information about microgrooves geometry will help to develop proper theory of hydrodynamic lubrication for micro-bearings with microgrooves and allows determining how the mode of operating affects on the wear of co-operating surfaces.

Słowa kluczowe

EN

atomic force microscope; surface topography; microgrooves; herringbone grooves; micro-bearing

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2012
• Tom: Vol. 19, No. 4
• Strony: 457--463
• Opis fizyczny: Bibliogr. 11 poz., rys.

Twórcy

autor

Miszczak A.

autor

Czaban A.

autor

Labuda W.

• Gdynia Maritime University, Faculty of Marine Engineering Morska Street 83, 81-225 Gdynia, Poland tel.: [phone], fax: [phone],

Bibliografia

• [1] Andharia, P. I., Deheri, G. M., Gupta, J. L., Effect of Longitudinal surface Roughness on the Behaviour of Squeeze Film in a Spherical Bearing, International Journal of Applied Mechanics and Engineering, Vol. 6, No. 4, pp. 885-897, 2001.
• [2] Asada, T., Saito, H., Asaida, Y., Itoh, K., Design of hydrodynamic bearing for height-speed HDD, Microsystem Technologies, 8, pp. 220-226, 2002.
• [3] Chizhik, S., Khudoley, A., Kuznetsova, T., Wierzcholski, K., Miszczak, A., Micro and Nanoscale Wear Studies of HDD Slide Bearings By Atomic Force Microscopy, Proceedings of Methodological Aspects of Scanning Probe Microscopy, Heat and Mass Transfer Institute of NAS, pp. 247-252, Minsk 2010.
• [4] Czaban, A., Miszczak, A., Surface Topography on Non-Operated Slide Journal Micro-Bearings, Journal of KONES Powertrain and Transport, Vol. 18, No. 2, pp. 109-115, 2011.
• [5] Gururajan, K., Prakash, J., Surface Roughness Effects in Infinitely Long Porous Journal Bearings, Transactions of the ASME, Journal of Tribology, Vol. 121, pp. 139-147, 1999.
• [6] Jang, G. H., Lee, S. H., Kim, H. W., Kim, C. S., Dynamic analysis of a HDD spindle system with FDBs due to the bearing width and asymmetric grooves of journal bearing, Microsystems Technologies, 11, pp. 499-505, 2005.
• [7] Jang, G. H., Seo, C. H., Ho Scong Lee, Finite element model analysis of an HDD considering the flexibility of spinning disc-spindle, head-suspension-actuator and supporting structure, Microsystem Technologies, 13, pp. 837-847, 2007.
• [8] Miszczak, A., Analiza hydrodynamicznego smarowania ferrocieczą poprzecznych łożysk ślizgowych, Monografia, Fundacja Rozwoju Akademii Morskiej, Gdynia 2006.
• [9] Wierzcholski, K., Miszczak, A., Adhesion Influence on the Oil Velocity and Friction Forces in Cylindrical Microbearing Gap, Scientific Problems of Machines Operation and Maintenance, Polish Academy of Sciences, Z.1 (161), Vol. 45, pp.71-79, Radom 2010.
• [10] Wierzcholski, K, Miszczak, A., Khudoley, A., Characterization of nano-grooved superficial layer of computer microbearings, Tribologia, 6, pp. 257-267, Radom 2011.
• [11] Wierzcholski, K., Miszczak, A., Load carrying capacity of microbearing with parabolic journal, Solid State Phenomena, Trans Tech Publications, Vols. 147-149, pp. 542-547, Switzerland, UK, USA 2009.