DOI: https://doi.org/10.20998/2078-7405.2020.93.12

IMPROVING THE PERFORMANCE CHARACTERISTICS OF HUMAN HIP-JOINT IMPLANTS BY INCREASING THE QUALITY OF PROCESSING AND GEOMETRIC ACCURACY OF THEIR SPHERICAL SURFACES

Raul Turmanidze, Giorgi Popkhadze, Ketevan Inasharidze

Abstract


In view of the fact that the endo-prosthesis heads of human hip-joint are operated in extreme conditions, in respect of load, the selection of corresponding material and also increase of precision and quality of machining of spherical surfaces is rather topical task. In the submitted work are reviewed the problems connected with definition of the influence degree of orientation of the sapphire crystal on its workability during diamond grinding with a butt of the ring and elaboration of the perspective, original scheme of formation of the incomplete spherical surface, particularly, of the sapphire head of endo-prosthesis of the human hip-joint.

Keywords


single crystal sapphire, anisotropy, grind ability, endo-prosthesis, precision grinding, forming and spherical surface.

References


Batiashvili B.I., Butskhrikidze D.S., Mamulashvili G.L., Mgaloblishvili O. B., Turmanidze R.S., Kromp K., Mills B., Steinkellner W., Schafler E., Rösel F. G., Peterlik H. Evaluation of surface preparation techniques, SFG: Swing Frame Grinding and LPG: Low Temperature Precision Grinding, by comparison of results on alumni and siliconcarbide model materials. FRACTOGRAPHY OF ADVANCED CERAMICS. International Conference Stará Lesná, High Tatras, May 2001.

Batiashvili B.I., Butskhrikidze D.S., Mamulashvili G.A, Turmanidze R.S., Kromp K., Mills B., Mgaloblishvili O. Technological Possibilities of Low Temperature Precision Grinding Process when Machining Hard and Brittle Materials. FRACTOGRAPHY OF ADVANCED CERAMICS, International Conference, Stará Lesná, High Tatras, May 2001.

Turmanidze R.S, Burtskhrikidze D.S, Kromp K., Mills B., “Low temperature precision grinding of hard and brittle materials”. Problems of mechanics and physiko-chemistry of the process of abrasive machining, Kiev 2002, 490-499 pp.

Turmanidze R.S., Butskhrikidze D.S., Mamulashvili G.L., Kromp K., Mills B., Morgan M., Mgaloblishvili O. Low-temperature precision grinding of hard and brittle materials and Outlook of its development and application. Proceedings of 19th NCMR Conference. Glasgow, September 2003.

R. Turmanidze, D. Butskhrikidze, E. Kutelia, M. Beridze, Influence of the Sapphire Crystal Anisotropy of Medical Purpose on Workability of the Endoprosthesis Material at a Low Temperature Precision Grinding. “MicroCAD 2008” International Scintific Conference. 20-21 March, 2008. Section N: Production Engine¬ering and Manufactu¬ring Systems. University of Mishkolc, Hungary. ISBN 978-963-661-812-4 Ö ISBN 978-963-661-823-0.

R. Turmanidze, G. Popkhadze, Selection criteria of optimal characteristic material and technologies for precision processing of basic working surface of human hip-joint implant. 9TH INTERNATIONAL CONGRESS ON PRECISION MACHINING. ATHENS, GREECE-2017, ISSN 0377-6883.Kundrak J., Varga G., Deszpoth I., Molnar V. Some aspects of the hard machining of bore holes // Applied Mechanics and Materials, 309, pp. 126–132 (2013).