Increasing of wear resistance of vehicles pulleys from aluminum alloys.
Students Name: Unhurian Oleh Oleksandrovych
Qualification Level: magister
Speciality: Motor Vehicle Transport
Institute: Institute of Mechanical Engineering and Transport
Mode of Study: full
Academic Year: 2020-2021 н.р.
Language of Defence: ukrainian
Abstract: Unhuryan O. Yuskiv V. (head) Increasing of wear resistance of vehicles pulleys from aluminum alloys. Master’s qualification work. - Lviv Polytechnic National University, Lviv, 2020. Extended annotation. Pulleys and belt drives work due to the force of the thorn that arises between the contact surfaces. One of the most common causes of their malfunctions is the production due to the natural wear of work surfaces under the action of heavy loads and the impact of abrasive materials. Due to intense abrasive wear and dynamic loading, the pulleys fail quickly. Recently, steel and cast iron pulleys have been replaced by the same ones made of aluminum alloys. This allowed to reduce the weight of the pulleys and reduce the effect of dynamic loading [1,2]. However, aluminum alloys have low resistance to abrasive wear and fail quickly. To increase the wear resistance of silumin pulleys, surface hardening is proposed by applying ceramic coatings to the surface by cold anodizing. Anodizing is a method of increasing the corrosion resistance of a metal product by forming a layer of oxide on its surface. The product being processed is the anode in this electrolytic process. It is performed at low, often negative, electrolyte temperatures [3]. The object of research is the process of obtaining an anode film on the surface of silumin pulleys of vehicle belt drives. The subject of research - pulleys of belt drives made of aluminum and aluminum alloys with applied ceramic coatings. The purpose and objectives of the study. Investigate the possibility of using the method of restoration of silumin pulleys of belt drives by cold anodizing, to create on their surface ceramic coatings that will provide satisfactory physical and mechanical characteristics of the surface. To achieve this goal the following tasks are set: 1. Using the method of anodizing to obtain ceramic coatings on samples of technically pure aluminum brand AD0 and alloy AK-4. 2. To determine the microhardness, wear resistance and roughness of the anode films, which is highly dependent on the method of production, the chemical composition of the anodized metal 3. According to the results of the tests to select the optimal anodizing parameters. The presence of impurities of Si, Fe, Cu and other metals in aluminum significantly reduces the hardness of the anode film. The hardness of the anode films is greatly affected by the bath temperature. As a rule, with increasing bath temperature, the hardness of the film decreases. The hardest are the oxide layers adjacent to the metal. The hardness of the films on aluminum (curve 1) changes relatively little with increasing amount of transmitted electricity, while the hardness of the films on the alloy AK4 (curves 2 and 3) decreases sharply. The results of tests of absolute and relative bulk wear resistance showed that the absolute wear resistance decreases markedly with increasing film thickness. When the film thickness is about 196 ?m, the wear of anodized aluminum and steel SHX15 is almost the same. Tests have also shown that the surface roughness during anodizing increases. 4. https://agrodoctor.ua/uk/dvigun/104888-shkiv-klinoreminnij-kompresora-kond-re10975-john-deere.html 5. http://ua.motofocus.eu/articles/6490,rukovodstvo-gates-po-ustranniyu-nispravnosty-sistmi-rmnnogo-privoda-3 6. Лукомский Ю.Я., Горшков В.К. Гальванические и лакокрасочные покрытия на алюминии и его сплавах. Л.: Химия, 1985. 184 с.