Proceedings of SerbiaTrib '13

Serbian TribologySocietySERBIATRIB ‘1313 th International Conference onTribologyKragujevac, Serbia, 15 – 17 May 2013Faculty of Engineeringin KragujevacTHE INVESTIGATION OF COATED TOOLS TRIBOLOGICALCHARACTERISTICS INFLUENCE ON THE CUTTING PROCESSAND THE QUALITY PARAMETERS OF THE PARTS SURFACELAYERFomenko Roman NikolaevichFSBEIHPE «Rybinsk State Aviation Technical University» named after P.A. Solovjev (RSATU), Russia,fomenko85@mail.ruAbstract: The influence of cutting tools nanostructured coatings on the parameters of machined partssurface layer has been researched. The interaction between friction characteristics of coated tools and shearplane angle during machining has been determined. The results of different materials cutting with coatedcarbide-tipped tools have been shown.Keywords: nanostructured coatings, quality parameters of the surface layer, tools friction coefficient1. INTRODUCTIONThe most important production properties arereliability and endurance. These properties provideproduct safety and competitiveness. The main causeleading to breakdown of parts is fatigue cracks.Such cracks appear and propagate in thin surfacelayers of parts. In order to hamper crack growing,the surface layer has to exhibit certain features.They are: roughness, residual stress and strainhardening, which depend on the characteristics ofcutting operation.The cutting force, temperature of cutting, depthof wear hardening and degree of deformation arereferring to the main characteristics of cuttingoperation. These characteristics influence on theparts quality, reliability and endurance.Technological conditions of cutting such as toolsgeometry, processing conditions, work materialproperties and tooling material properties, includingtribological feathers, determine the characteristicsof cutting process. Therefore there is a need toselect optimal cutting conditions to provide therequirement parts quality. In order to select optimalcutting conditions, there is necessity to have aspecial methodic, which takes into considerationthe relationship between parts quality andtechnological conditions.2. TASKS OF RESEARCHAt the Rybinsk state of aviation technicaluniversity named after P. A. Solovjev (Russia)there was developed the methodic, which permit toestimate the optimal cutting conditions. On the baseof this methodic underlay a functional connectionbetween cutting rate, tools geometry and theparameters of surface layer, accuracy of machiningand the rigidity of manufacturing system, includingwork material and tool material properties.But all advanced tools have wear-resistantcoatings that exhibit specific properties. Wearresistantcoatings have low friction coefficient inconsequence of weak adhesion interaction ofcovering material with work material. Theyinfluence on the cutting process and qualityparameters of the surface layer. Tools coveringsreduce chips contact length with tools surface,cutting force, temperature of cutting anddeformation of cut allowance. It causes due toincreasing of a chip flow angle.Thus the main purpose of research was thecreation of the methodology for calculation oftechnological conditions of turning, which providesrequired quality and accuracy levels at the stage ofmachining and takes into consideration thetribological properties of coated tools.198 13 th International Conference on Tribology – Serbiatrib’13