DOI: 10.18503/1995-2732-2024-22-2-101-110
Abstract
Relevance. The development of new methods of hardening, which include, in particular, reverse burnishing, requires a scientifically based determination of processing modes that ensure the achievement of certain quality characteristics of the surface layer. The experimental studies showed that the pattern of changes in the quality indicators of the surface layer of machine parts, depending on the technological parameters and reverse burnishing modes, was ambiguous. In this regard, the task of determining rational SPD modes during reverse burnishing is of particular interest. Objectives. Determination of rational SPD modes during reverse burnishing, which would contribute to obtaining processing modes that ensure obtaining the minimum possible values of the microgeometric characteristics of the surface and the maximum possible values of the mechanical properties of the hardened layer. Methods Applied. The study applied experimental methods for determining the quality indicators of the hardened layer of cylindrical parts and multiple regression analysis to process the results obtained. Originality. To determine rational processing modes, the authors determined empirical patterns of individual quality indicators and the technological parameters of the reverse burnishing process The results of multiple regression analysis were processed in the computer program Microsoft Visual Studio 2012. Result. It has been established that rational reverse burnishing modes provide for the lowest microgeometric surface parameters, high mechanical properties and large compressive residual stresses in the surface layer of cylindrical machine parts. Practical Relevance. To obtain the lowest microgeometric parameters of the surface of hardened parts (roughness, waviness and out-of-roundness), the following hardening modes are established: Spr = 0.07÷0.10 mm/rev; nр = 60÷100 rpm; t = 0.08÷0.10 mm; nр = 115÷120 stroke/min; αн = 90о and αр = ±10о ÷ ±20о. To increase compressive residual stresses and mechanical properties of the surface layer of parts, it is recommended to apply the following hardening modes: Spr = 0.07÷0.10 mm/rev; nр =280÷300 rpm; t = 0.28÷0.30 mm; nр = 290÷300 stroke/min; αн = 90о and αр = ±55о÷±60о.
Keywords
reverse burnishing, microhardness, roughness, compressive residual stresses, rational processing modes
For citation
Nguyen Huu Hai, Zaides S.A. Determination of Rational Reverse Burnishing Modes for Cylindrical Machine Parts. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2024, vol. 22, no. 2, pp. 101-110. https://doi.org/10.18503/1995-2732-2024-22-2-101-110
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