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Degradace strojírenských materiálů opotřebením
Liška, Jaromír
The aim of this paper is to analyse the process of wear and abrasive materials which are able to withstand wear and to prove these findings in experiments in both laboratory and operational conditions. The first section includes an analysis of a material of the worn parts of dies (mould tools) for the manufacture of technical ceramics and solutions to increase their lifespan. A more resistant ledeburitic tool steel for the manufacture of dies (mould tools) 19 573 (according to ČSN) was chosen. The second section comprises laboratory tests with chosen PVD coatings applied on selected steel. The most resistant nitride coating was chosen after laboratory tests done in an abrasive vessel and with an abrasive cloth. The third section describes the operational test of the dies (mould tools) with functional component parts on which there was applied a chosen coating. The last section of the work proves the possibility of a usage of tool steels for the manufacture of abrasively stressed components of a plough. Unalloyed structural steel samples with a different heat treatment and the abrasion-resistant material Hardox were tested together with the samples of tool steels. The wear resistance of these steels was also proven by the laboratory tests with the abrasive cloth and the Bond`s device. The results were statistically evaluated, compared and graphically displayed. The achieved results can be applied in technical practice and they enable us to determine the way of the future development.
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Stroje pro sklizeň píce: příprava výukových materiálů
ZUKAL, Martin
This bacalar thesis provides an overview of forage harvesting machines. The thesis is divided into chapters according to individual types of machines and provides a view of their agrotechnical requirements, partition, description of basic carried out operations and description of their basic work. The bacalar thesis should serve as supplementary teaching text for students of the Department of Agricultural, transport and handling Technology of the Faculty of agriculture of South Bohemian University. Information and parameters are found in the technical literature on agricultural machinery, promotional materials and websites of manufacturers and vendors of this technique.
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Lisy na válcové balíky
Ostrý, Tomáš
This bachelor's thesis is focused on basic sorting of balers for round bales and description of individual working parts. Attention is paid to structural differences be-tween fixed and variable pressing chamber, and their advantages and disadvantages. The thesis includes general knowledge of models from major producers, which are sold and used the most often, and news on marketplace, too.
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Degradace strojírenských materiálů opotřebením
Liška, Jaromír
The aim of this paper is to analyse the process of wear and abrasive materials which are able to withstand wear and to prove these findings in experiments in both laboratory and operational conditions. The first section includes an analysis of a material of the worn parts of dies (mould tools) for the manufacture of technical ceramics and solutions to increase their lifespan. A more resistant ledeburitic tool steel for the manufacture of dies (mould tools) 19 573 (according to ČSN) was chosen. The second section comprises laboratory tests with chosen PVD coatings applied on selected steel. The most resistant nitride coating was chosen after laboratory tests done in an abrasive vessel and with an abrasive cloth. The third section describes the operational test of the dies (mould tools) with functional component parts on which there was applied a chosen coating. The last section of the work proves the possibility of a usage of tool steels for the manufacture of abrasively stressed components of a plough. Unalloyed structural steel samples with a different heat treatment and the abrasion-resistant material Hardox were tested together with the samples of tool steels. The wear resistance of these steels was also proven by the laboratory tests with the abrasive cloth and the Bond`s device. The results were statistically evaluated, compared and graphically displayed. The achieved results can be applied in technical practice and they enable us to determine the way of the future development.
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