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Aplikace technických materiálů a tvrdokovů u štípacích břitů na přírodní kámen
 Hejzlar, Samuel
The diploma thesis is focused an the field of stone splitting and especially the splitting tools of hydraulic splitting machines, a splitting knife, thanks to which the stone is split. The first part describes the base material used for knife splitting production. Both types of steel and cemented carbides are described below. Followed by introduction of stone splitting and methods of stone extraction. This part is closed by an overview of products made of splited stone. The experimental part deals with measurements, which was aimed on demonstraion of the impact on the used materials and on the lifetime of the splitting knife. Also on the influence of the knives edge and the quality of the final product. The characteristics of the stone, used in the measurements, were subjected to tests, which were carried out in the Hořice test facility and the results are ilustrated in the graphs. In the thesis is also described the operation of the Sumrakov quarry from where the measured tools are. Also stone splitting machines ,manufactured by Gestra CZ s.r.o., have been thoroughly analyzed.
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Rozebíratelné spoje ve strojních konstrukcích
 Hejzlar, Samuel
Presented Bachelors thesis is focused on threaded joints in engineering. There is listed simple determination of theses joints in the first part of the thesis as well as the type determinations, sample of practical use and type of the load. In the second part, are specifically described some screw joints used on compaction rollers, produced and developed in Ammann CZ company, which is located in Nové Město nad Metují and produce these rollers since 1953.
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4 Hejzlar, Štěpán
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