The study of the deformation of steel parts after cementation and hardening

Authors: Shavrin P.P.
Published in issue: #6(47)/2020
DOI: 10.18698/2541-8009-2020-6-617
Category: Mechanical Engineering and Machine Science | Chapter: Technology and Equipment of Mechanical and Physical Processing
Keywords: technological process, part size, allowance, warping, deformation, cementation, hardening
Published: 21.06.2020

The paper is devoted to a method for reducing the effect of warping of parts subjected to cementation and hardening on the final dimensions of the parts is considered. The problem is relevant, because it constantly arises in real production. The effect of warping (deformation) on the dimensions of steel parts is investigated. Analysis of the measurement results allowed us to determine the numerical values of the reduction of the linear and diametrical dimensions of the parts. The importance of the study lies in the fact that with known qualitative characteristics of the problem, its numerical indicators, which are important for practical work, are not given in the literature and publications. When calculating technological dimensional chains at the stage of designing a technological process, it is proposed to increase the dimensions of parts before cementing by 0.05 ... 0.20% relative to the nominal technological size in order to reduce defects and improve the operational properties of parts.

References

[1] Zinchenko V.M. Inzheneriya poverkhnosti zubchatykh koles metodami khimiko-termicheskoy obrabotki [Engineering of gear wheels by chemical thermal treatment methods]. Moscow, Bauman MSTU Publ., 2001 (in Russ.).

[2] Tokaev D.N., Gorbunova A.S., Kuznetsova E.V., et al. Calculation of strain bevel gears during heat treatment. Prikladnaya matematika i voprosy upravleniya [Applied Mathematics and Control Sciences], 2016, no. 3, pp. 51–59 (in Russ.).

[3] Rozhkov I.I., Myl’nikova V.V. Calculation of inner residual stress appearing in hardened parts after chemical thermal treatment. Mezhdunarodnyy zhurnal eksperimental’nogo obrazovaniya, 2014, no. 1-2. URL: https://expeducation.ru/ru/article/view?id=4568 (in Russ.).

[4] Suraeva A.Yu., Shubina N.B. Progressive technologies and the equipment of heat treatment of carburized parts of mining machines. Nauchnyy vestnik Moskovskogo gosudarstvennogo gornogo universiteta [Mining Science and Тechnology], 2010, no. 3, pp. 21–27 (in Russ.).

[5] Gulyaev A.P. Metallovedenie [Metal science]. Moscow, Metallurgiya Publ., 1986 (in Russ.).

[6] Smirnov M.A., Schastlivtsev V.M., Zhuravlev L.G. Osnovy termicheskoy obrabotki stali [Fundamentals of steel thermal treatment]. Ekaterinburg, UrO RAS Publ., 1999 (in Russ.).

[7] Bondarenko S.I., Karpenko V.A., Nesterenko E.A., et al. Character and gear failure causes of construction and agricultural machinery. Vestnik KhNADU [Bulletin of Kharkov National Automobile and Highway University], 2011, no. 54, pp. 127–133 (in Russ.).

[8] Morozova L.V., Orlov M.R. Fatigue destruction of driving bevel gear in gas-turbine engine of 12Kh3NVFMB steel. Stal’, 2015, no. 2, pp. 68–71 (in Russ.).

[9] GOST 2.316-2008. Edinaya sistema konstruktorskoy dokumentatsii (ESKD). Pravila naneseniya nadpisey, tekhnicheskikh trebovaniy i tablits na graficheskikh dokumentakh. Obshchie polozheniya [State standard 2.316-2008. Unified system for design documentation. Rules for placing the inscriptions, technical data and tables of graphical documents. General principles]. Moscow, Standartinform Publ., 2009 (in Russ.).

[10] PI 1.2.669-2003. Proizvodstvennaya instruktsiya. Khimiko-termicheskaya obrabotka staley [PI 1.2.669-2003. Technical guidelines. Chemical thermal treatment of steels]. Moscow, VIAM Publ., 2003 (in Russ.).