Dyrda V.I., Chernii O.А., Kalhankov Ye.V., Tolstenko A.V., Filipenko O.M. Tests for abrasive wear of modern materials for futting working surfaces of machines

Details
Parent Category: Geo-Technical Mechanics, 2020
Category: Geo-Technical Mechanics, 2020, № 151

Geoteh. meh. 2020, 151, 150-156

DOI: https://doi.org/10.15407/geotm2020.151.150

Tests for abrasive wear of modern materials for futting working surfaces of machines

1Dyrda V.I., 2Chernii O.А., 2Kalhankov Ye.V., 2Tolstenko A.V., 1Filipenko O.M.

1Institute of Geotechnical Mechanics named by N. Poljakov of NAS of Ukraine, 2Dnipro State Agrarian and Economic University

UDC 622.73:621,926.002.75

Language: Russian

Abstract.

Abrasion is the main reason for the destruction of the working surfaces of machines that work in different sectors of industry. This study presents the abrasion test results for materials that are used to make parts for protective coatings: a rubber for linings manufactured by Valsa-GTV LLC and thermoplastic polyurethane with the trade name Desmopan. During the tests, the friction force and abrasive wear of the samples were measured. Worn surfaces and wear particles were examined using an optical microscope. On worn surfaces of test specimens. scratches were observed (parallel to the sliding direction), and ridges (perpendicular to the sliding direction).

 The study of wear particles shows that they (especially for Desmopan) in a dry slip state during friction on the abrasive sandpaper P150 were aggregated into skating particles. During friction on the abrasive sandpaper P40, aggregation of wear particles was absent. The results show that the coefficient of friction of rubber decreases with increasing size of the abrasive. For Desmopan, the coefficient does not depend so much on the size of the abrasive. Also, in all samples, the weight of the erased material decreases with an increase in the abrasive value. Abrasion of thermoplastic polyurethane under the trade name “Desmopan” in the abrasion test in all experiments is more than in lining rubber.

Full-scale experimental studies were carried out at the Poltava GOK at the mill МШР 4,5´6,0 ІІІ grinding stages (size of ore pieces +2 mm); 10 mm thick Desmopan plates were glued on the face lifters. Longevity to failure was approximately 1,500 hours.

It is shown that the Desmopan thermoplastic polyurethane can be successfully used as a protective coating for parts that work in a medium of small abrasive and do not perceive impact loading. The use of polyurethane as a material for lining drums of ball mills and trays of vibratory feeders has shown the low operational reliability.

Keywords:

rubber, thermoplastic polyurethane, abrasive wear, abrasion

References:

1.   Dyrda, V.I. (1988), Prochnost i razrusheni y eelastomernykh konstruktsiy v ekstremalnykh usloviyakh [Strength and destruction of elastomeric structures in extreme conditions], Naukova dumka, Kyiv, USSR.

2.   Bulat, A.F., Dyrda, V.I., Zviagilskii, E.L. and Kobets, A.S. (2012), Prikladnaya mekhanika uprugo-nasledstvennykh sred. Tom 2. Metody rascheta elastomernykh detalei [Applied mechanics of elastic-hereditary media. Vol. 2. Design techniques of elastomeric parts], Naukova dumka, Kyiv, Ukraine.

3.   M. Mofidi and B. Prakash (2008), “Influence of counterface topography on sliding friction and wear of some elastomers under dry sliding conditions”, Proc. Inst. Mech. Eng. Part J.: J. Eng. Tribol., 222(5), pp. 667-673.
https://doi.org/10.1243/13506501JET392

4.   Kobets, A.S., Dyrda, V.I., Kalhankov, Ye.V., Tsanidi, I.M. and Cherniy, O.A. (2019), “Abrasive-fatigue wear of the rubber lining in the context of fractal analysis”, Geo-Technical Mechanics, no. 144, pp. 103-110.
https://doi.org/10.15407/geotm2019.144.103

5.   Covestro Global Corporate Website (2020), “Desmopan® – Thermoplastic Polyurethane”, available at: www.covestro.com (Accessed 15 March 2020).

About the authors:

Dyrda Vitalii Illarionovych, Doctor of Technical Sciences (D. Sc.), Professor, Head of Department of Elastomeric Component Mechanics in Mining Machines, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Science of Ukraine, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Chernii Oleksandr Anatoliiovych, Master of Science, Senior Lecturer of Department “Reliability and repair of machines”, Dnipro State Agrarian and Economic University, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Kalhankov Yevhen Vasylovych, Master of Science, Senior Lecturer of Department “Reliability and repair of machines”, Dnipro State Agrarian and Economic University, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Tolstenko Oleksandr Vasylovych, Candidate of Technical Science (Ph. D.), Associate Professor of Department “Reliability and repair of machinery”, Dnipro State Agrarian and Economic University, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Filipenko Olena Mykolaivna, Master of Science, Engineer of Department of Elastomeric Component Mechanics in Mining Machines, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Science of Ukraine (IGTM NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.