National Repository of Grey Literature 67 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Design of a group milling fixture for clamping components
Kalous, Jan ; Dvořák, Jaromír (referee) ; Zemčík, Oskar (advisor)
The thesis deals with the design of a group milling jig for four different shaped components. These parts are components of a baking line and are designed to clamp baking matrices for wafer production. The semi-product for all the parts is a casting made of EN-GJS-400-15, cast iron with spheroidal graphite. Machining on a horizontal milling centre MS NH5000 DCG from DMG Mori Czech s.r.o. was chosen to produce all four parts. A list of tools and gauges was made. Subsequently, a technological process was created for the selected part with the designation HAAC-62836-001. Then the cutting forces from the individual cutter inserts, clamping, and friction forces were calculated to verify that the machined piece could move in the jigs. This thesis includes calculations of both jigs and evaluation according to the technical aspect.
Design and manufacture of Mjölnir hammer by casting
Bubník, Šimon ; Bořil, Petr (referee) ; Myška, Martin (advisor)
The aim of this bachelor's thesis was to design suitable technologies for the production of Thor's hammer casting within the BUT school foundries. The work contains a theoretical part, which summarizes the casting technology itself, focusing on the production of non-permanent molds, cores and molding compounds. Furthermore, the work contains a practical part, which describes the process of casting production from the creation of the model and its printing, the subsequent production of the mold to the finishing of the casting.
Production of castings using Rapid prototyping
Baránek, Martin ; Myška, Martin (referee) ; Bořil, Petr (advisor)
The work is focused on the production of a decorated stand casting using rapid prototyping and reverse engineering methods. The thesis first performs a literature search dealing with selected additive technologies usable for the production of foundry patterns or molds. Subsequently, the work describes the basics of 3D scanning technology. The experimental part of the thesis describes the production process of castings. The original was first digitized using a hand-held scanner, the obtained data were modified as needed and served as an input for 3D printing of permanent foundry patterns. Their production took place on a FDM 3D printer PRUSA MK3S and they were made of PLA material. The models were then formed into sand molds. The resulting castings were made of grey cast iron.
Technology of aluminum alloy part production
Kostka, Dominik ; Kalivoda, Milan (referee) ; Osička, Karel (advisor)
The subject of this thesis is to focus on the casting and machining of aluminium alloy parts. Aluminium alloy castings can be cast by all the technologies available today, but only metal mould casting is the most suitable for aluminium alloys due to the rapid cooling process. The machinability of an aluminium alloy casting can be highly productive but carries the problem of build-up on the tool. The build-up can be avoided by changing the technology, choosing a different cutting material, or cutting conditions. Machining an aluminium alloy casting is more productive and less costly due to the small machining charge and the use of a more powerful machine. When machining apart from a semi-finished round bar, we need to use more machines, more process operations, and this will increase the overall production time of the batch. From a technical and economic point of view, the production costs for a semi-finished product from a casting are one third lower than for a semi-finished product from a cross-section.
Metal-lock a jeho využití v automobilovém průmyslu
Klement, Michal
This bachelor thesis covers the Metalock method as a cold repair form of damaged mechanical components. It clarifies the principle of the method in detail, materials used on repairs and particular proces, containing the set up and the execution of the method. The thesis sumarizes constructional and economical advantages and disadvantages of this type of repair from conventional processes of repairs, especially from welding. As the Metalock method aims all above to the repairs of casts, are here centrain types of cast materials, especially cast iron types and alluminium alloys analyzed. Last but not least this thesis goes in creations of in service defects and their classification. In the end, a theoretical repair od rotational component was made by the Metalock method together with concept of its balance.
Use of 3D technology in foundry industry
Straka, Pavel ; Krutiš, Vladimír (referee) ; Pernica, Vítězslav (advisor)
The work is focused on replacing a faulty briefcase handle with an aluminium substitution. The handle is fabricated with the help of reverse engineering, where the handle is scanned with a 3D scanner. With that information, a model copy of the part is made, which is 3Dprinted from PLA and PolyCast materials. These handles are used as expendable models, which are used for casting using an “investment casting” method. Those are made from an AlSi10Mg alloy. Theoretical part deals with additive technologies, which are mostly used for manufacturing of foundry models and moulds. Next, the basic principles of 3Dscanning are described, and the term reverse engineering is also explained.
Manufacture of cylinder head casting for engine renovation Jawa 50
Pastyřík, Petr ; Myška, Martin (referee) ; Bořil, Petr (advisor)
This project elaborats the manufacture of a cylinder head casting for an engine renovation of Jawa 50. Based on the literary pursuit of suitable foundry technologies and using 3D printing in foundry a casting production technology was designed and the cylinder head was made. The part was designed in the CAD software and then printed on a 3D printer. The printed model was formed in ceramic shell form, then melted and the form was annealed. After that the cast was casted. The last operations were fettling and finishing machining.
Production of casting cylinder for engine modification of motorcycle Jawa 50
Chvátal, Pavel ; Pernica, Vítězslav (referee) ; Bořil, Petr (advisor)
Production of casting cylinder for engine modification of motorcycle Jawa 50. This bachelor thesis deals with the design of an air-cooled cylinder for racing modification of the JAWA 50 engine and its subsequent implementation using the rapid prototyping function. The designed part was cast and the finished casting was subjected to analysis.
Design of the tribometr frame by casting technology
Vítek, Petr ; Frýza, Josef (referee) ; Košťál, David (advisor)
This Bachelor´s Thesis presents an engineering design of cast frame for simulator of elastohydrodynamic contact. Original frame is folded from machined parts, which limits shaping and increases the cost of production. Through the analysis of the current state and applicable foundry technologies has been developed design for new cast frame. The output is accompanying report and drawing documentation. The accompanying report documents the prototype production process.
Segregation during solidification in austenitic-ferritic stainless steels
Kejha, Richard ; Čech, Jan (referee) ; Pernica, Vítězslav (advisor)
The master thesis deals with processes of segregation in austenitic-ferritic stainless steels. The introductory part consists of characteristics features of austenitic-ferritic steels and theoretical analysis of segregation processes. The second part shows practical measurements of segregation in experimental casting. Macrosegregation was measured on a spectrometric analyzer and simultaneously solved in the simulation program MAGMA. The aim of this thesis is to verify the effect of solidification time and dwell time between liquidus and solidus temperature on the chemical heterogeneity of duplex stainless steel casting of about 500 [mm]. Chemical heterogeneity was solved for selected alloying and accompanying elements such as C, Mo, Ni, Mn, Cr. The microsegregation was not addressed. Comparison of the mechanical properties of cast and heat treated duplex steel was done by tensile testing of samples cut from the center of the casting.

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