Technology Support for Protecting Contacting Surfaces of Half-Coupling—Shaft Press Joints Against Fretting Wear

Martsynkovskyy, Vasyl; Tarelnyk, Viacheslav; Коноплянченко, Євген; Гапонова, О. П.; Dumanchuk, M.

doi:10.1007/978-3-030-22365-6_22

Cited by 29 publications

(16 citation statements)

References 11 publications

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“…First of all, it is necessary to dwell on a scientific task that does not lose its relevance for a long time: increasing the durability and wear resistance of parts. In work [1], technological support for the protection of contact surfaces of press joints against wear is substantiated. Often, it is proposed to solve such a problem by improving the coatings of parts.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Determining regularities in the construction of curves and surfaces using the Darboux trihedron

Ahmed

Nesvidomin

Pylypaka

et al. 2023

EEJET

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The Frénet trihedron, known in differential geometry, is accompanying for a spatial and, as a special case, for a flat curve. Its three mutually perpendicular unit orts are defined uniquely for any point on the curve except for some special ones. Unlike the Frénet trihedron, the Darboux trihedron relates to the surface. Two of its unit orts are located in a plane tangent to the surface, and the third is directed normally to the surface. It can also be accompanying for the curve, which is located on the surface. To this end, one of the orts in the plane tangent to the surface must be tangent to the curve. Trihedra are movable and, with respect to a fixed coordinate system, change their position due to movement and rotation. The object of research is the process of formation of curves and surfaces, as a result of the geometric sum of the bulk motion of the Darboux trihedron and the relative motion of the point in its system under given conditions. In the study of the geometric characteristics of curves and surfaces, it is necessary to have formulas for the transition from the position of the elements of these objects in the system of a moving trihedron to the position in a fixed Cartesian coordinate system. This is exactly what needs to be solved. The results obtained are parametric equations of curves and surfaces that are tied to the initial surface. Nine guide cosines were found, three for each ort. A distinctive feature of this approach in comparison with the traditional one is the use of two systems: fixed and mobile, which is the Darboux trihedron. This approach allows us to consider in a new way the problem of the construction of curves and surfaces. The scope of practical application can be the construction of geometric shapes on a given surface. An example of such a construction is the laying of a pipeline along a given line on the surface. In addition, the sum of the relative motion of a point in a trihedron and the bulk motion of the trihedron itself over the surface gives an absolute trajectory of motion. Its sequential differentiation produces absolute speed and absolute acceleration without finding individual components, including the Coriolis acceleration. This could be used in point dynamics problems

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Determining regularities in the construction of curves and surfaces using the Darboux trihedron

Ahmed

Nesvidomin

Pylypaka

et al. 2023

EEJET

View full text Add to dashboard Cite

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“…We have shown that the alloying procedure performed by the elements during the ESA process can be accomplished by creating a special technological environment (STE) without the use of expensive electrode materials and with a reduction in the time for obtaining a coating, thereby increasing productivity and cutting production costs. This can likewise be done for processes such as sulphidising [ 24 ], sulfocarburising, sulfoalitising [ 25 ], and complex coatings [ 26 ]. While considering the ESA process, it becomes clear that an important role is played by the method for thermodynamic modelling of coating synthesis, which makes it possible to evaluate the interaction products profile in the multiphase multicomponent systems [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Technological Capabilities for Forming Al-C-B System Coatings on Steel Surfaces by Electrospark Alloying Method

et al. 2021

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In this paper, the possibility of applying the electrospark alloying (ESA) method to obtain boron-containing coatings characterised by increased hardness and wear resistance is considered. A new method for producing such coatings is proposed. The method consists in applying grease containing aluminium powder and amorphous boron to the surface to be treated and subsequently processing the obtained surface using the ESA method by a graphite electrode. The microstructural analysis of the Al-C-B coatings on steel C40 showed that the surface layer consists of several zones, the number and parameters of which are determined by the energy conditions of the ESA process. Durametric studies showed that with an increase in the discharge energy influence, the microhardness values of both the upper strengthened layer and the diffusion zone increased to Wp = 0.13 J, Hµ = 6487 MPa, and Wp = 4.9 J, Hµ = 12350 MPa, respectively. The results of X-ray diffraction analysis indicate that at the discharge energies of 0.13 and 0.55 J, the phase composition of the coating is represented by solid solutions of body-centred cubic lattice (BCC) and face-centred cubic lattice (FCC). The coatings obtained at Wp = 4.9 J were characterised by the presence of intermetallics Fe4Al13 and borocementite Fe3 (CB) in addition to the solid solutions. The X-ray spectral analysis of the obtained coatings indicated that during the electrospark alloying process, the surface layers were saturated with aluminium, boron, and carbon. With increasing discharge energy, the diffusion zone increases; during the ESA process with the use of the discharge energy of 0.13 J for steel C40, the diffusion zone is 10–15 μm. When replacing a substrate made of steel C40 with the same one material but of steel C22, an increase in the thickness of the surface layer accompanied by a slight decrease in microhardness is observed as a result of processing with the use of the ESA method. There were simulated phase portraits of the Al-C-B coatings. It is shown that near the stationary points in the phase portraits, one can see either a slowing down of the evolution or a spiral twisting of the diffusion-process particle.

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“…In [ 18 ], a new technology for forming a package of flexible elements for an elastic coupling was developed. The additional incorporation of molybdenum disulfide into the metal-cladding lubricant, which consists of paraffin and copper powder, allows for the fretting resistance of the flexible elements to be increased by ~2.5 and 1.1 times, respectively, as compared with the flexible elements without any lubricant and those with a metal-cladding lubricant without molybdenum disulfide.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Quality of Sulfomolybdenum Coatings Obtained by Electrospark Alloying Methods

et al. 2021

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The authors of this paper have attempted to improve the quality of surface layers applied to steel elements of machine parts constituting friction couples. The main goal of the research was to investigate an electrospark alloying method process for obtaining abrasion-resistant tribological coatings containing molybdenum disulfide on a steel surface. A substance in the form of sulfur ointment with a sulfur content of 33.3% was applied on the surfaces of C22 and C40 steel specimens. In order to determine the influence of the energy parameters of ESA equipment on the quality parameters of coatings, the ESA process was carried out using a molybdenum electrode with discharge energies Wp = 0.13; Wp = 0.55; Wp = 3.4 J. The following tests were carried out on specimens with such coatings: metallographic analysis, microhardness tests, surface roughness, and local X-ray diffraction microanalysis. The experiments revealed that sulfomolybdenum coatings consist of four zones with different mechanical properties. Depending on the discharge energy and the substrate material, the hardness of these zones varies from approx. 1100 to over 10,000 MPa. Differences in the distribution of, among others, sulfur and molybdenum in the obtained coatings, as well as differences in the microstructure of the observed coatings, were observed.

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Technology Support for Protecting Contacting Surfaces of Half-Coupling—Shaft Press Joints Against Fretting Wear

Cited by 29 publications

References 11 publications

Determining regularities in the construction of curves and surfaces using the Darboux trihedron

Determining regularities in the construction of curves and surfaces using the Darboux trihedron

Assessment of Technological Capabilities for Forming Al-C-B System Coatings on Steel Surfaces by Electrospark Alloying Method

Analysis of the Quality of Sulfomolybdenum Coatings Obtained by Electrospark Alloying Methods

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