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Analysis of non-metalic inclusions in motor heads castings and suggestion on their remove
Dratnal, Lukáš ; Lána, Ivo (referee) ; Roučka, Jaromír (advisor)
Improving the quality of metal castings for serial production of automotive industry, leading to improvements in the properties of casts and their lower costs. This publication analyzes the non-metallic inclusions contained in casts of heads of internal combustion engines, molded of Nemak Czech Republic, Ltd. Tackling includes analysis of size, shape, chemical composition and hardness of the specific non-metallic inclusions. The thesis describes the purity metal holding furnaces and proposals to eliminate inclusions from metal.
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Influence of modification and inoculation on structure and mechanical properties of aluminium alloys
Janošťák, Jan ; Lána, Ivo (referee) ; Roučka, Jaromír (advisor)
This thesis examines the influence of inoculation and modification on the internal structure and properties of aluminium-silicon alloys. The effect of inoculation by titanium and boron and modification by sodium and strontium is investigated in experimental part of the thesis. All these metallurgical interventions in the melt are tested on three types of hypoeutectic Al-Si alloys (AlSi10Mg(a), AlSi8Cu3, AlSi7Mg0,3). The experiment was carried out in cooperation with the foundry of non-ferrous metals, Aluminium Group, a.s. in Sloup.
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Costs reduction in production of Al-alloy castings
Nováková, Lucie ; Lána, Ivo (referee) ; Roučka, Jaromír (advisor)
This thesis deals with solving the most serious internal defects in castings made of aluminum alloys which are cast in sand molds in Slévárna a modelárna Nové Ransko Ltd. The problem solving contains a description of the problematic castings with the investigation of the structure and phases and subsequent detailed analysis of their production. The Author of this thesis also examines the influence of Fe and Mn on a possible formation of the internal porosity with the help of test meltings with the evaluation of the internal structural change. The Author’s design solution is a close checking of chemical composition with regard to the ratio Mn / Fe present in the alloy, the purchase of Foundry Degassing Unit to reduce gassiness of melted metals and better control of gassiness with the help of the appropriate equipment for the density Dichte index.
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The study of increase in efficiency of manufacturing preparation of technology
Šudoma, Michal ; Lána, Ivo (referee) ; Jurová, Marie (advisor)
This paper discusses different alternatives of more efficient preparation of spheroided graphite cast iron production. Secondary metallurgy and chemical heating technology are used to recast cast iron fused in copula furnace. The work applies the known physical-chemical rules used in the production of quality spheroided graphite cast iron in regular production conditions. Based on the previous developments, the aim was to prepare implementation of verified secondary metallurgy processes in adjusted casting ladle. The casting ladle was adjusted in order to allow execution of all processes required in order for the relevant standards and material lists requirements to be met in respect to spheroided graphite cast iron quality. Comments regarding the trends in ferroalloy metallurgy and related marketing approach of the company. The work is concluded by a summary of advantages brought in by the new approaches compared to the traditional ones from the economical as well as environmental perspective.
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Manufacture of flaskless foundry moulds in ferrous and non-ferrous metal foundries
Bořil, Petr ; Lána, Ivo (referee) ; Cupák, Petr (advisor)
The bachelor thesis handles a summary of working methods of frameless casting molds and compares advantages and disadvantages of individual technologies. In its practical part, the thesis is focused on a corporation Slévárna a modelárna Nové Ransko, s.r.o. whose frameless molding went through a modernization that is the subject of this thesis. A morally and physically obsolete production line UNIVERSAL KFA 20 was exchanged for a more accurate and efficient one – DISA MATCH 20/24.
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Semi-solid casting of aluminium alloys
Zelníčková, Marta ; Lána, Ivo (referee) ; Roučka, Jaromír (advisor)
The great emohasis is placed on product quality and ecology of production at this time. New technologies are created still. This technologies are improve quality product and reduce productive cosi to a minimum, while production is the most environmentally. The Semi-solid casting started to developer in the 20 century. Semi-solid casting combines the method of casting and forming. High surface and microstructure guality are guaranteed. However preparation of production is economically costly. The special alloys are suitable for semi-solid casting. Development takes plase still. Aluminium alloys are very utilized for this technology, due to the good mechanical properties.
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Use of numerical simulation for reduction of scrap from Al alloys
Doležal, Petr ; Lána, Ivo (referee) ; Krutiš, Vladimír (advisor)
This thesis deals with the possibilities of current simulation software and their use in technical practice. The aim of the thesis is to describe the process of the simulation; summarise the required initial parameters of the cast in order to achieve a credible simulation, and to describe the possibilities of the use of simulation software in the area of casting defect prediction. This theoretical analysis is applied on a specific cast, which is subject to a simulation trying to find an ideal inflow system, as well as predicting the formation of possible defects. The accuracy of this simulation will be proved by analysing an actual cast product.
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Manufacture of aluminium alloy castings
Moravec, Lukáš ; Lána, Ivo (referee) ; Záděra, Antonín (advisor)
This thesis deals with the production of castings of aluminum alloys with a focus on a comparison of the melting process in the gas, crucible, tilting furnaces with melting in gas, shaft furnaces. Resolves proposal links the advantages of both types of melting furnaces into a single unit. The work includes economic evaluation of cost and projected savings in the operation of the new kiln unit.
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Analysis of employees work satisfaction
Pátková, Markéta ; Palíšková, Marcela (advisor) ; Lána, Ivo (referee)
The content of this bachelor assignment is to identify basic factors of work satisfaction on basis of theoretical findings. Consequently, analysis of work sarisfaction was performed in a factual company -- Slevarna a modelarna Nove Ransko, s.r.o. (Foundry and modelar works Nove Ransko, Ltd.) with an aim to identify factors of work satisfaction there. Improvement assessments are drawn on principles of acquired findings. Suggestion for improvements on the basis of these findings is drawn up to cover work satisfaction and motivation of company employees. Collection of data for the empirical part of this assignment is through a survey with cooperation of company workers. Respondents are questioned of work satisfaction in the following areas: content of work, financial assessment, work conditions, relationship at work place, relationship to company and work's prospect.
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