RESISTANCE TO CONTACT FATIGUE OF COARSE-GRAINED GEARS OF CHROMIUM-NICKEL STEELS

RUDENKO Sergei P., Ph. D. in Eng., Leading Researcher, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it..">This email address is being protected from spambots. You need JavaScript enabled to view it..

VALKO Aleksandr L., Senior Researcher, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

SHYSHKO Sergei A., Deputy General Designer, OJSC “BELAZ” — Management Company of Holding “BELAZ-HOLDING”, Zhodino, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

KARPOVICH Peter G., Head of the Design Office, OJSC “BELAZ” — Management Company of Holding “BELAZ-HOLDING”, Zhodino, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

The results of complex studies of coarse-grained gears made of carburized chromium-nickel steel 20Kh2N4A are presented. It is shown that with the stable operation of thermal equipment fitted with computer-aided systems for automatic control of the parameters of the technological process of chemical heat treatment in coarse-grained gears of steel 20Kh2N4A, a diffusion layer is formed with a surface hardness of 60–61 HRC and an effective thickness (0.08–0.1)m to a microhardness of 750 HV0.2. It is found that the increased kinematic error after chemical heat treatment of gears made of steel 20Kh2N4A leads to uneven removal of the allowance at the final grinding of the teeth, which is the reason for reducing the resistance of contact fatigue in the local area of the diffusion layers of the teeth.

coarse-grained gear wheels, chromium-nickel steel, chemical heat treatment, kinematic error, resistance to contact fatigue

1. Susin A.A. Khimiko-termicheskoe uprochnenie vysokonapryazhennykh detaley [Chemical heat reinforcement of heavily stressed components]. Minsk, Belorusskaya nauka Publ., 1999. 175 p.
2. Tesker E.I. Sovremennye metody rascheta i povysheniya nesushchey sposobnosti poverkhnostno-uprochnennykh zubchatykh peredach transmissiy i privodov [Modern methods of calculation and increase of carrying capacity of the strengthened toothed gearings of transmissions and drive gears]. Moscow, Mashinostroenie Publ., 2011. 434 p.
3. Rudenko S.P., Valko A.L. Kontaktnaya ustalost zubchatykh koles transmissiy energonasyshchennykh mashin [Contact fatigue of transmissions gearwheels of high-energy machines]. Minsk, Belaruskaya navuka Publ., 2014. 126 p.
4. Rudenko S.P., Valko A.L., Mosunov T.I. Struktura tsementovannykh sloev zubchatykh koles transmissiy energonasyshchennykh mashin [The structure of carburized layers of transmissions gears of power-saturated machines]. Metallovedenie i termicheskaya obrabotka metallov [Metallurgical science and heat treatment of steels], 2012, no. 4, pp. 38–42.
5. Rudenko S.P., Valko A.L. Soprotivlenie kontaktnoy ustalosti tsementovannykh zubchatykh koles iz khromonikelevykh staley [Resistance of contact fatigue of carburized gears from chromium-nickel steels]. Metallovedenie i termicheskaya obrabotka metallov [Metallurgical science and heat treatment of steels], 2017, no. 1, pp. 58–62.
6. Rudenko S.P., Shipko A.A., Valko A.L., Kuzmenkov O.V. Proektirovanie vysokoeffektivnykh tekhnologicheskikh protsessov khimiko-termicheskoy obrabotki zubchatykh koles transmissiy energonasyshchennykh mashin [Designing of highly effective technological processes of chemical heat treatment of the vehicles transmission gears]. Mekhanika mashin, mekhanizmov i materialov [Mechanics of machines, mechanisms and materials], 2011, no. 2, pp. 67–70.
7. Rudenko S.P., Valko A.L. Opredelenie parametrov khimiko-termicheskoy obrabotki vysokonapryazhennykh zubchatykh koles na osnove raschetnykh modeley [Definition of parameters of chemical and heat treatment for high-stressed gear wheels on basis of computational models]. Uprochnyayushchie tekhnologii i pokrytiya [Hardening technologies and coatings], 2018, no. 8, pp. 353–358.
8. Rudenko S.P., Valko A.L., Shipko A.A. Povyshenie ekspluatatsionnykh kharakteristik zubchatykh koles karernykh samosvalov posredstvom optimizatsii rezhimov khimikotermicheskoy obrabotki [Increase of operational characteristics of the dump trucks gear wheels by means of optimization of chemico-thermal treatment regimes]. Lite i metallurgiya [Foundry production and metallurgy], 2013, no. 2, pp. 110–114.
9. Sagaradze V.S. Povyshenie nadezhnosti tsementuemykh detaley [Improving the reliability of carburized parts]. Moscow, Mashinostroenie Publ., 1975. 216 p.
10. Shishko A.S., Moiseenko V.I., Sidorenko A.G. Povyshenie resursa krupnogabaritnykh zubchatykh koles s ispolzovaniem novykh staley [Increase of lifetime of large-sized tooth gears using new steels]. Sbornik nauchnykh statey “Aktualnye voprosy mashinovedeniya” [Collection of scientific papers “Topical issues of mechanical engineering”], 2017, issue 6, pp. 219–225.
11. Valko A.L., Rudenko S.P., Mosunov E.I., Mikhlyuk A.I. Metallograficheskiy reaktiv dlya vyyavleniya mikrostruktury tsementovannoy konstruktsionnoy stali [Metallographic reagent for detection of microstructure of cemented structural steel]. Patent RB, no. 15273, 2011.
12. Rudenko S.P., Valko A.L. Osobennosti rascheta zubchatykh koles transmissiy na glubinnuyu kontaktnuyu vynoslivost [Features of analysis of gear wheels of transmissions on deep back-to-back endurance]. Vestnik mashinostroeniya [Bulletin of mechanical engineering], 2015, no 11, pp. 5–11.
13. Rudenko S.P., Valko A.L. Osobennosti primeneniya economnolegirovannykh staley dlya krupnomodulnykh zubchatykh koles [Application features sparingly alloyed steels for coarse-grained gear wheels]. Stal [Steel], 2018, no. 8, pp. 54–58.