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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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Optimization of aluminium casting process using numerical simulation
Kolařík, Martin ; Lána, Ivo (referee) ; Krutiš, Vladimír (advisor)
The master’s thesis deals with the analysis of casting technology of the selected aluminium casting. It is a casting of a part of CNC milling machine and it is cast by gravity casting into a permanent mold. The defects which are the cause of a high percentage of nonconforming production were analyzed. Furthermore, the master’s thesis includes a complete analysis of filling and solidification of this casting in the ProCast simulation program. Numerical simulation results are verified and improved. Then the causes of problematic casting defects are proven on several calculated variants. Measures are proposed to minimize the tendency to produce castings with defects leading to nonconforming production.
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Manufacture of castings from electrical copper
Janský, Vojtěch ; Lána, Ivo (referee) ; Záděra, Antonín (advisor)
The goal of this thesis is to verify influence of conditions of metallurgical treatment, used foundry technology and conditions of solidification on electrical conductivity of pure copper castings. The experiment part observe differenec between alloy melting under normal pressure and in a vacuum and betwwen casting provided with chill, insulation and natural enviroment of mould.
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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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Proposal of casting technology for cooper alloy castnig with regard to their quality and productivity of fininishing oprations
Herzán, Jiří ; Lána, Ivo (referee) ; Roučka, Jaromír (advisor)
This paper is created based on the real situation in Armatmetal s.r.o. Based on customer requirements and possible reduction of finishing operations at the end of production in the foundry. The foundry technology of gravity casting into sand molds is changed to gravity casting into metal mold. To change technology at Armatmetal s.r.o. two types of castings were selected. The "Kloub 55 s vidlicí" casting was selected by the customer to test the new technology. Casting "Klínová koncovka KN10" was chosen by Armatmetal s.r.o. because of the structural design of the casting and the high repeatability of production. Castings are the subject of the paper. The diploma thesis includes methods of solving the elimination of foundry defects occurring on a complicated casting " Kloub 55 s vidlicí". The main aim of the thesis is to assess the technical-economic contribution of the change of foundry technology of the casting " Klínová koncovka KN10". The paper also includes a complex comparison of the current and new technology production with related problems and their solutions.
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Optimization of metallurgical processes in aluminum alloys foundry
Halaška, Jan ; Lána, Ivo (referee) ; Kaňa, Václav (advisor)
Diploma thesis examines the influence of the preparation and metallurgical treatment on the mechanical properties and structure of aluminium alloys Al-Si. The experimental part was carried out at MSR Engines s.r.o. This part describes the current (sodium modification) and newly proposed (strontium modification) state of preparation and metallurgical processing of melt. There is state the course of experimental melting processes, testing of samples, evaluation of tests and observation of the impact of individual modifiers on the structure.
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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 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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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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