National Repository of Grey Literature 49 records found  beginprevious40 - 49  jump to record: Search took 0.00 seconds. 
Defects in steel castings
Jakubec, Petr ; Kaňa, Václav (referee) ; Pernica, Vítězslav (advisor)
This bachelor’s thesis deals with the problems of defects that occur in steel castings. First, the use of steel in the foundry industry and the development of classification of casting defects are described. Furthermore, it defines the term ‘casting defect’ and its division. The main part of the thesis focuses on the most frequent defects in steel castings. The aim of this literature search is to describe the casting defects and their causes and to present possible precautions against their rise. Possible ways of removing the casting defects are discussed as well as their repairs.
Manufacture of cast iron mortar replica
Myška, Martin ; Pernica, Vítězslav (referee) ; Kaňa, Václav (advisor)
This bachelor thesis deals with the complete production technology of mortar replica. The first part describes the historical development of mortar and pestle in Bohemia and in the world. In the second part there is the description of the technological process of production of models and the methods of molding process. Finally, the production of the mold, subsequent casting and purifying process of the mortar are documented.
Reduction of the body weight of passenger cars based on material choice
Petrucha, Roman ; Pernica, Vítězslav (referee) ; Šenberger, Jaroslav (advisor)
This bachelor thesis contains a description of the most commonly used materials and manufacturing technology for the body of cars. For this purpose, in the first chapter describes the vehicle body with the safety requirements that are placed on it. There are also analyzed the benefits of the overall reduction in vehicle weight. The following chapter describes the materials which are used for the construction of the body. The last chapter discusses the issue manufacture of bodies, where are analyzed some manufacturing technologies.
Surface casting defects
Rašek, Ondřej ; Pernica, Vítězslav (referee) ; Tomek, Ladislav (advisor)
Surface defects in casting include after decades of research on current problems of metal cast. They mean significant losses for foundries. Thesis includes a review of kinds of defects, their origins and their examinations, the effects on the mechanical properties and their machinability.
Manufacture and use of high-alloy steel castings
Koláček, David ; Kaňa, Václav (referee) ; Pernica, Vítězslav (advisor)
This thesis includes material issue-knowledge of stainless steel cast. In the first part of thesis are analysed the causes of corrosion, its impact on metal material and is explained the creation of corrosion resistance.The next part of thesis introduces separation of stainless steel based on structure and chemical composition, explains its properties and its possibilities of using in practise. The thesis also explain some production processes of the stainless steel cast. In the final part of thesis are illustrated some possibilities of using stainless steel in practise.
Manufacture of bells
Dušek, Otakar ; Šenberger, Jaroslav (referee) ; Pernica, Vítězslav (advisor)
The bachelor thesis titled „Manufacture of bells” contains basic information about the historical development of bells, acoustic characteristics of the bells and particular processes accompanying their production. There are in detail particular phases of production and necessary equipment described in this work. The text also deals with the materials that are used for bells manufacturing. The analysis of the bell metal is the most discussed issue in this part, since it is the best and most widely used material for these purposes.
Manufacture of heavy steel castings - application, manufacturing and properties
Němeček, Jakub ; Pernica, Vítězslav (referee) ; Záděra, Antonín (advisor)
Bachelor’s thesis was developed in full-time courses in B-STI Mechanical Engineering. The present work had as main goal to search on the topic of dealing with the use, production and properties of heavy steel castings. Most of the thesis was devoted to manufacturing and defects that are often specific massive castings.
History of ferrous alloys manufacture in the Foundry of ŽĎAS, a. s.
Nejedlý, Tomáš ; Pernica, Vítězslav (referee) ; Šenberger, Jaroslav (advisor)
The thesis describes the history of modern age of steel production in Ţďár region, and the history of metallurgical engineering company ŢĎAS. The work is divided into the theoretical part of the steel production on electric arc furnaces along with brief history from steel production in bloomery furnace to the modern steel manufacturing technology - secondary metallurgy. The second part describes the history of steel production in Ţďár region until the formation of metallurgical engineering company ŢĎAS, and consequently the company development from the construction to the present day. The thesis are focused on the development of secondary metallurgy by which the ŢĎAS company can reach the steel with high level of micro cleanness and high level of mechanical properties. Using by this technology the company can extend its product range by introducing new steel grades. Thanks to the continuous progress and efforts to achieve the best results in steel quality, the ŢĎAS company be among the largest producer of quality steel not only in the Czech Republic.
Manufacture of heavy steel castings
Klváček, Jan ; Pernica, Vítězslav (referee) ; Záděra, Antonín (advisor)
The aim of this bachelor thesis is perform a search on the topic of heavy castings of the steel. Production of heavy castings is a special part in manufacturing steel castings. Their properties are extremely influenced by a long time, which results in the creation of many metallurgical casting defects. Heavy castings are produced in small series or just a piece production. There-fore not possible remove defects during the manufacturing process. For the production of heavy castings are required specific requirements for this reason.
Application of magnesium alloys castings
Pernica, Vítězslav ; Liškutín, Petr (referee) ; Roučka, Jaromír (advisor)
Magnesium alloys are still idle in technical applications because of their properties. The history of metal is not very old, the first application of its alloy started on the beginning of the 20th century. Magnesium is very light. Its weight is about one third less than the weight of aluminum and it is the third most frequented structural metal. However its preparation and processing can be problematical because magnesium has high affinity to oxygen. It causes intensive burning. During the century of stature have been improved both production and alloys. The usage of magnesium alloys took more importance and it is the most used alloy in automotive field sofar. Recently its demand expands mainly in electrotechnics. Next usage we can find in aeronautics, energetics, military and many other branches.

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