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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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Proposition of casting technology of aluminium manifolds cast by tilt method
Spáčil, Ivo ; Kaňa, Václav (referee) ; Roučka, Jaromír (advisor)
Description of the theoretical factors for casting into metal molds. For thin-walled castings it has turned out that the most advantageous method is tilt casting. Tilt casting reduces the turbulence of the melt and reaches a directed solidification. Two molds were tested and measured for the experiment. During measuring the temperature regime was established lower temperature of the pouring basin than the other parts of the mold, which could cause a many of defects. The verification of mold technology has been performed. To achieve the accuracy of the casting, it is necessary to respect the different shrinkage according to the shape of the casting.
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Prediction of mechanical properties of lamelar iron castings by means of numerical simulation
Filipek, Szymon ; Hrouzek, Petr (referee) ; Roučka, Jaromír (advisor)
The aim of this thesis was to assess the degree of conformity between the mechanical properties evaluated by numerical simulation in software MAGMA5 and the measured values of hardness and ultimate tensile strength of lamellar graphite iron castings. The theoretical part of this thesis deals with the classification of cast iron, structural components of lamellar graphite iron, and the factors defining the resulting mechanical properties of the material. The practical part presents an attempt to find empirical dependencies between input parameters and results evaluated by simulation software. At the end, an analysis of the correlation between reality and simulation software is performed.
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Production of thinwall iron castings
Kryštůfek, Tomáš ; Kaňa, Václav (referee) ; Roučka, Jaromír (advisor)
This diploma thesis is focused on production and problems in production of thin-walled ductile iron castings, especially in the inoculation process. The focus is on the influence of elements on the structure and mechanical properties of ductile iron and as well as the influence of some elements, that are commonly used in inoculation alloys. Furthermore, the factors that affect the production technology are written, i.e., solidification rate, wall thickness, cooling rate, and factors used for affecting the thin-walled castings production, i.e., the use of insulating moulding compounds and increasing the graphite nodule count. At the end of the theoretical part, important production processes are analysed, namely inoculation and spheroidization. The experimental part is focused on influencing the structure and mechanical properties using several types of inoculants of different chemical compositions, whereas the tested thicknesses of the test plates are 3-, 5- and 8-mm. Hardness, tensile strength and ductility are evaluated on these plates. Finally, the volume of ferrite in the structure, shape and size of the graphite nodules were examined.
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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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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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The use of aluminium parts in construction of ingeneering constructions
Suk, Pavel ; Střítecký, František (referee) ; Roučka, Jaromír (advisor)
Study describes is dealing with the application of the aluminum extrusions for industrial purposes. The introduction is dealing with the industrial applications in general terms. It includes the chemical and physical properties of aluminum. It is followed by description of various aluminum alloys, their properties such as suitability for machining, welding, plasticity and resistance to corrosion. Next chapter is listing aluminum applications, namely as a building components in civil engineering such as various extrusions and a modular components. At the closing of this paper there is an example of an actual application of aluminum prefabricated conveyer segments. The conveyor is part of an assembly line for K350 units.
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Use of controlled gassing of Al-Si alloys during die casting
Jankes, Erik ; Kaňa, Václav (referee) ; Roučka, Jaromír (advisor)
This master thesis will cover the possibility of using directed gassing of Al-Si alloys in a high pressure die casting foundry. As a control gas, rotary degasser with gaseous 20 % H2 in N2 as a medium was used. Castings were casted via high pressure die casting machine. The aim of this research is to compare internal defect such as porosity or shrinkage of a casts made from degassed and control gassed melt.
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