Nanostructured Processes at the Destruction and Wear of Carbide Cutting Tools

At present, the study of nanostructured processes at the destruction and wear of carbide cutting tools is an important task. The results of numerical calculations for stress states of carbide tool cutting wedges are presented. For the first time it has been specified how the stresses that arise due to the wear on the front surface of the tool are distributed in the cutting wedge. The most likely causes and mechanisms of tool fracture have been determined. These findings can be used to develop recommendations to increase the rate of the machining process. The influence of the carbide structure on the brittle fracture and tool wear has been analyzed. It has been shown that the strength of the carbide is determined by the nanostructured layers of the cobalt phase. It has been found that at the optimum cutting speed a process of nanostructured character occurs. During this process the carbide phase grains undergo wear and subsequently form an ensemble of wear nanoparticles that contributes to the durability of the tool contact surfaces. This process should be regarded as a result of self-organization of the cutting system. The ways to increase the efficiency of the cutting tools have been specified. 

References

[1] Zorev N.N. Voprosy mechaniki prozessa rezaniya metallov [Questions mechanics of metal cutting process]. Moscow, Mashgiz publ., 1956. 365 p.

[2] Kabaldin Iu.G., Seryi S.V., Kretinin O.V., Laptev I.L., Vlasov E.E., Kuz’mishina A.M. Komp’iuternoe modelirovanie i issledovanie nanostruktur v protsessakh obrabotki rezaniem na osnove kvantovo-mekhanicheskikh raschetov [Computer modeling and study of nanostructures in machining processes on the basis of quantum mechanical calculations]. N.Novgorod, NNSTU n.a. R.E. Alekseev publ., 2014. 119 p.

[3] Zolotukhin I.B. Nanokristallicheskie metallicheskie materialy [Nanocrystalline metal materials]. Sorosovskii obrazovatel’nyi zhurnal [Sorosovskiy Educational Journal].1998, no. 1, pp. 103–106.

[4] Kabaldin Iu.G. Samoorganizatsiia i nanostrukturnye protsessy pri rezanii metallov [Selforganization and processes in nanostructured metal cutting]. N.Novgorod, NNSTU n.a. R.E. Alekseev publ., 2014. 173 p.

[5] Smirnov V.F. Fizika fraktal’nykh klasterov [Physics of fractal clusters]. Moscow, Nauka publ., 1998. 256 p.

[6] Kabaldin Iu.G., Seryi S.V., Kretinin O.V., Laptev I.L. Samoorganizatsiia i nanostrukturnye protsessy pri rezanii metallov [Self-organization and processes in nanostructured metal cutting]. N.Novgorod, NNSTU n.a. R.E. Alekseev publ., 2014. 173 p.

[7] Kabaldin Y.G., Seryi S.V., Muravev S.N., Prosolovich A.A., Simagina E.V. Improving cutter performance by the application of nanostructural coatings. Russian Engineering Research, 2010, vol. 30, no. 3, pp. 235–242.