Restoration of the tribotechnical pairs in equipment of mining industry
M. Biloshytskyi1, H. Tatarchenko1, N. Biloshytska1
1Volodymyr Dahl East Ukrainian National University, Sievierodonetsk, Ukraine
Min. miner. depos. 2019, 13(3):68-75
https://doi.org/10.33271/mining13.03.068
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ABSTRACT
Purpose. Substantiation of the possibilities and development of technology for the restoration of the worn-out tribotechnical pairs of mining equipment by methods of hot radial stamping in powder metallurgy using technogenic waste.
Methods. Powder for wear-resistant material was obtained from metal-abrasive sludge waste. The grinding sludge of 40X10С2М steel was used, which contains 65 – 70% of metal, 10 – 15% of non-metallic component and 20% of lubricating-cooling fluid by a special preparation: grinding, washing, dehydration, drying, magnetic separation, recovery annealing in a generator gas. The wear resistance of tribotechnical pairs of powder composite materials was assessed according to DSTU 2823-94. The wear resistance of the restored tribotechnical pairs has been determined by means of stand experimental research on the SMC-3 testing machine in the conditions of limited lubricants feeding. The reasons for improving the wear resistance have been revealed by means of metallographic studies, as well as the composition with higher properties has been set through the research of powder compactability.
Findings. The compositions of powder, composite materials for the restoration of tribotechnical pairs using technogenic wastes and the technology of their application to the surfaces of parts have been developed. A wear-resistant powder layer for the restoration of the “shaft”-type parts has been obtained, working in pair with a composite recovery layer of the “hub”-type part. The physical and mechanical characteristics of a recovery layer of worn-out surfaces of “shaft – hub”-type parts have been studied. The influence of the percentage anti-seize additive content on the wear resistance of the obtained materials under conditions of contamination with coal dust has been determined. The scheme for restoring worn-out surfaces of “shaft – hub”-type tribotechnical pairs has been proposed. The research results enable to extend the life of worn-out parts, which will result in savings to replace with new parts.
Originality. It has been found that the introduction of 15% copper into a composite recovery layer of a “hub”-type part leads to the formation on the surface of a partition of solid and strong non-metallic layer, which leads to increased wear resistance of the tribotechnical pair.
Practical implications. The proposed scheme for the restoration of worn-out surfaces by the method of hot radial stamping of powdered materials enables the utilization of technogenic waste and helps to extend the service life of worn-out parts, which leads to savings in their replacement.
Keywords: tribotechnical pair, wear resistance, powder, bimetal, restoration, coal industry
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