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Design of robotized workplace for die forging
Krejčí, Radek ; Zavadil, Radek (referee) ; Podaný, Kamil (advisor)
The thesis deals with the design of technology for production of wheels to be manufactured by die forging 15 142 low-alloy steel at an amount of 500,000 items per year. Based on a consideration of the suitable methods of manufacture, die forging on a Jing Duann FP-1600G vertical forging press was chosen as the best, as documented by the necessary technological and design drawings. A die with inserts made of 19 552 steel was designed for this machine. In view of the volume of annual production, a fully automated workplace was designed consisting of three robots and a chain and pan conveyor. In the conclusion there was a technical-economic evaluation of costs for the material of the semi-finished products and price of dies for annual production.
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Production technology of plastic carrier information
Krejčí, Radek ; Kebrle, Ondřej (referee) ; Kandus, Bohumil (advisor)
This bachelor's diploma thesis presents a proposal for the production technology of plastic carrier information, which is produced using injection molding technology. In the general literary study, plastic materials and injection molding technologies are analyzed. In the practical part of the thesis, the material of the plastic carrier information is selected. From the calculated technological parameters, the design of the injection mold is created and a suitable injection-molding machine is selected. Finally, a technical-economic evaluation is carried out, in which the cost of producing one piece of plastic carrier information is calculated.
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Design of robotized workplace for die forging
Krejčí, Radek ; Zavadil, Radek (referee) ; Podaný, Kamil (advisor)
The thesis deals with the design of technology for production of wheels to be manufactured by die forging 15 142 low-alloy steel at an amount of 500,000 items per year. Based on a consideration of the suitable methods of manufacture, die forging on a Jing Duann FP-1600G vertical forging press was chosen as the best, as documented by the necessary technological and design drawings. A die with inserts made of 19 552 steel was designed for this machine. In view of the volume of annual production, a fully automated workplace was designed consisting of three robots and a chain and pan conveyor. In the conclusion there was a technical-economic evaluation of costs for the material of the semi-finished products and price of dies for annual production.
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Production technology of plastic carrier information
Krejčí, Radek ; Kebrle, Ondřej (referee) ; Kandus, Bohumil (advisor)
This bachelor's diploma thesis presents a proposal for the production technology of plastic carrier information, which is produced using injection molding technology. In the general literary study, plastic materials and injection molding technologies are analyzed. In the practical part of the thesis, the material of the plastic carrier information is selected. From the calculated technological parameters, the design of the injection mold is created and a suitable injection-molding machine is selected. Finally, a technical-economic evaluation is carried out, in which the cost of producing one piece of plastic carrier information is calculated.
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Hodnocení výnosotvorných prvků, výnosu a kvality zrna ječmene po řízené výživě dusíkem a sírou
Krejčí, Radek
An experiment was carried out on a small plot of land belonging to Agrospol Velká Bystřice, an agricultural company, in 2012 and 2013. In this experiment Bojos, a variety of spring barley, was used, and we were able to observe the influence of nitrogen and sulphur on the grain yield and quality. The experiment consisted of 13 variants fertilized with two levels of nitrogen nutrition (N1 = 30 kg, N2 = 50 kg/ha). Sulfur was also applied in two forms -- as elementary sulphur op sulphate. A higher dose of nitrogen had increased yield and positive impact on the content of N-substances in barley grain and reduced the starch content and the amount of grain which passed through a 2,8 mm sieve. Malt extract content corresponded to the starch in the barley grain. The variant with a hinger dose of nitrogen sulphate (21 kg S/ha) produced the highest yield. The lowest yield was observed in the variant without fertilizer which also had the highest level of grain owerflow with a 2,8 mm sieve. From a density point of view, variant 10, where we used fertilizer LAV 27 (which has a lower dose of nitrogen) and 30 kg S/ha of elementary sulfur, appears to result in the best grain. The lowest average amount of N-substances was visible in the variant without fertilizer. An increase in the nitrogen dose caused an increase in the amount of N-substances in barley grain. The combination of nitrogen and sulfur in the fertilizer also increased the amount of N-substances. With increasing dose of nitrogen the starch content decreased. In most cases, it was confirmed that the average starch content has negative correlation with the yield and content of N-substances.
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Odhad rychlosti regenerace acidifikovaných půd a povrchových vod v Orlických horách jako východisko pro strategická rozhodnutí v oblasti péče o lesy
Stockholm University, Department of Meteorology, Stockholm ; Česká geologická služba, Praha ; Krejčí, Radek ; Hofmeister, Jeňýk ; Hruška, Jakub
Cílem projektu je prognóza budoucího vývoje acidifikovaných půd a povrchových vod v Orlických horách. Pomocí geochemického modelu MAGIC a měřeného chemismu depozice, půd, půdních a povrchových vod bude odhadnut budoucí vývoj a možný stupeň regenerace či dalšího poškození lesních ekosystémů. Pro 3 malá povodí budou zpracovány následující scénáře: 1. setrvalý stav depozice jako dnes, 2. pokles depozice způsobený změnou lesa (přechod ze smrků na bukové porosty), 3. historický vývoj v případě pokud by byl les v původním složení. Největší pozornost bude věnována vyhodnocení klíčových parametrů pro přežívání lesa na acidifikovaných půdách, zejména poměru (Ca+Mg+K)/Al v půdním roztoku. Budou vypracována doporučení jak v oblasti lesnicky hospodařit, aby došlo k regeneraci půd a byla alespoň částečně zachována produkce. Výsledky prací za rok 2002 ukazují, že je dlouhodobě situace v Orlických horách neuspokojivá. Přetrvává vysoká depozice síry a sloučenin dusíku. Půdní analýzy ukazují typický stav horských smrčin - kyselé půdy s malou bazickou saturací.
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