Abstract
The authors obtained dependencies of the surface layer properties after machinig cylinder holes by vibroburnishing. The properties of the surface layer are changed from a variety of vibroburnishing factors. Surface layer quality graphics of the machining parameters are obtained by mathematical modeling using formulas derived empirically. During the processing of experimental data, the authors of the articles identified optimal processing regimes in which parameters of the quality of the surface layer of the billet can be specified. Thus, vibroburnishing is better to make machining on the mode: m = 16,5 mm, i = 1,7 mm, α = 7,5 °, Ay = 160 J, ƒ = 20 Hz. It was found that the greater vibroburnishing tightness is, the greater the value of size of the cold-hardening layer is. Rougher surface will always have bigger tightness of burnishing, i.e. the purer surface is, the lower the value of tightness of a vibroburnishing must be. However, in the process of a vibrational burnishing of holes there is a so-called critical point, roughness of a surface decreases and the surface layer of metal is strengthened before reaching this point, and after reaching it there is a phenomenon of a re-cold-hardening and quality of a surface decreases.
Highlights
The agro-industrial complex of the Republic of Kazakhstan (AIC of KZ) occupies a considerable part of the gross domestic product (GDP) and is one of the priority industries of national economy
Researches and practice of operation of hydraulic cylinders show that surfaces of machine parts are exposed to the greatest stress while inside layers of metal do not experience that load
The use of surface plastic deformation is highly effective means of reduction of surface roughness, formation of residual tension of compression in a surface layer of parts, increase in superficial hardness and wear resistance which leads to substantial increase of machine reliability
Summary
Tatyana Nikonova1* Gulnara Zhetessova[2] Vasiliy Yurchenko2 1S. Seifullin Kazakh AgroTechnical University, Astana, Kazakhstan 2Karaganda State Technical University, Karaganda, Kazakhstan. The authors obtained dependencies of the surface layer properties after machinig cylinder holes by vibroburnishing. Surface layer quality graphics of the machining parameters are obtained by mathematical modeling using formulas derived empirically. Vibroburnishing is better to make machining on the mode: m = 16,5 mm, i = 1,7 mm, α = 7,5 °, Ay = 160 J, ƒ = 20 Hz. It was found that the greater vibroburnishing tightness is, the greater the value of size of the cold-hardening layer is. In the process of a vibrational burnishing of holes there is a so-called critical point, roughness of a surface decreases and the surface layer of metal is strengthened before reaching this point, and after reaching it there is a phenomenon of a re-cold-hardening and quality of a surface decreases
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