The Tribotechnical Properties of Electrosparks with a Secondary Bronze Coating

Agricultural machinery is stated to break down mainly due to the wear of structural parts. Thus, there is a necessity to apply new materials for manufacturing individual machine units whose characteristics will not be inferior to those of their prototypes. The paper primarily focuses on the components that work in movable joints, in particular, on the sleeve type bronze plain bearings which are exposed to high wear and often need replacing. The use of polymers for manufacturing such parts is supposed to solve the problem of untimely failure of machine components. (Research purpose) To compare the tribotechnical properties of cultivator sliding bearings made of bronze and polyamide. (Materials and methods) Two samples were made: one was made of the sliding bearing (BrO10F1 grade bronze) of the SunGarden GT10 cultivator, the other – of a PA-6 polyamide type rod. Special equipment was used such as: X-ray fluorescence spectrometer Thermo Scientific Niton XL3t 900 GOLDD+, TRB-S-DE Tribometer CSM Instruments. (Results and discussion) Comparative tribotechnical ball-disk tests were carried out. It was found out that polyamide sample has certain advantages over a bronze standard: it has a 4-times better friction coefficient and a 12-times better wear intensity. (Conclusions) It was determined that the use of polymer plain bearings will result in 2 times longer service life of agricultural cultivators and their 1.5 times increased efficiency.

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Tribotechnical Properties of Materials for Cultivator Sliding Bearings

Denisov

Zadorozhniy

Romanov

et al. 2022

S-h. maš. tehnol.

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Restoration of Metal Molds for Centrifugal Casting of Pipe From High-Strength Iron by Arc Welding

Slinko,

Chavdarov

2023

Teh. serv. maš

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Currently, metal molds for casting cast-iron pipes operate under severe temperature and deformation conditions, as a result of which they fail due to wear of their inner surface and the formation of cracks and a mesh of heat in the same place. (Research purpose) The research purpose is studying the possibility of defect-free restorative surfacing of the inner surface of metal molds without preheating in the environment of protective gases. (Materials and methods) All work on the development of the metalform surfacing technology was carried out on samples cut from the original metalforms. The method of arc surfacing in the environment of protective gases was taken as a basis. Various welding wires and protective media were tested for surfacing. Assessment of the surfacing quality for the presence of pores and cracks before and after mechanical treatment was carried out visually, followed by determination of the chemical composition and hardness of the deposited layer. (Results and discussion) Surfacing was carried out on the inner surfaces of the samples without preheating them. Various wires were tested for surfacing: Sv-18XGS, Sv-18XM and Np-30XGSA based on obtaining a composition close to the composition of the base metal in the deposited layer. As a result, Sv-18XMA welding wire with a diameter of 2.0 millimeters was chosen for the restorative surfacing, and a welding mixture was used as a protective medium, ensuring satisfactory formation of the deposited layer without pores and cracks with minimal splashing in the selected modes. Studies were carried out to determine the hardness and chemical composition of the deposited layer and the base metal of metal forms. (Conclusions) Proposed a technology for reducing the surfacing of the inner surface of metal molds without preheating. A comparative analysis of the hardness and chemical composition of the deposited layer and the base metal of the metal forms showed a comparable level of hardness and alloying elements in them, which will ensure the necessary wear and heat resistance of the restored metal forms

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Elimination of Cracks in Metal Parts

Kostyukov,

Aulov,

Evsyukov

2023

Teh. serv. maš

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One of the most versatile and effective methods of restoring parts is the method of electric spark processing. On the basis of this method, a technological process was developed that allows to obtain a thick-layer coating of increased continuity. The use of electric spark processing in the restoration of parts is an urgent task of eliminating cracks in metal parts of machines. (Research purpose) The research purpose is eliminating cracks in metal parts of machines by the electric spark processing to obtain sealed coatings. (Materials and methods) BRKMTS3-1 bronze was chosen as the main electrodes, M1 copper was chosen for the reflow electrode for experimental work to eliminate cracks by electric spark treatment. It was determined that the process of eliminating cracks took place in several cycles. (Results and discussion) Experiments have shown that, using only the reception of a thick-layer electric spark coating, it is possible to close a crack up to 1.5 millimeters wide inclusive, but it is practically impossible to obtain a sealed coating. It was established as a result of studies of the effect of surface plastic treatment that the average microhardness of the coating, untreated by the method of surface plastic deformation, was 250 according to Vickers. The maximum microhardness of the sample treated by the method of surface plastic deformation at a depth of 0.05 millimeters was more than 500 Vickers. (Conclusions) The experiments carried out to eliminate cracks have shown that using only the reception of a thick-walled electric spark coating, it is easy to close a crack up to 1.5 millimeters wide inclusive, but it is almost impossible to obtain a sealed coating, since it has significant porosity. For those cases where the tightness of the seam is mandatory, additional processing by the method of surface plastic deformation is necessary.

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The Tribotechnical Properties of Electrosparks with a Secondary Bronze Coating

Cited by 8 publications

References 11 publications

Tribotechnical Properties of Materials for Cultivator Sliding Bearings

Tribotechnical Properties of Materials for Cultivator Sliding Bearings

Restoration of Metal Molds for Centrifugal Casting of Pipe From High-Strength Iron by Arc Welding

Elimination of Cracks in Metal Parts

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