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Production of terminal pin by cold forming
Šuranský, David ; Lidmila, Zdeněk (referee) ; Forejt, Milan (advisor)
The thesis presents a manufacturing technology proposition for a terminal pin made of copper according to ČSN 42 3001.1 located in combution engine distributor in a series of 320 000 pcs. Based on a literature study, 3 versions of operation sequence were proposed, 2 of them with concern for lowest number of operations possible and the third, chosen one, was designed so the strain and therefore mechanical properties were equal in whole volume of final part. Forming force and work were calculated, utilizing the Johnson-Cook material model. Overall calculated forming force was 64,5 kN and total work for one part 189 J. Subsequently technical drawings of die and punch for the second operation of forward extrusion of shaft were processed along with workspace assembly drawing for the Šmeral TPM 5 machine, which was chosen for the fabrication. Economic evaluation set the costs for one part manufactured 0,09 Eur and equilibrium point, after which the production generates profit, located at 170 000 pcs produced.
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Production of the screw
Starý, Petr ; Podaný, Kamil (referee) ; Císařová, Michaela (advisor)
The bachelor´s degree project deals with the production of rotating component using cold forming technology. There are described basic principles of technology, used material, tools and machines and the area of usage. Production of the screw is based on the literary studies and technical calculations. The suggested manufacturing variant consists of five steps and containing cutting, extrusion and upsetting. As raw material was chosen a wire with diameter of 12,5 mm and length of 38,6 mm made of steel 12040. For chosen variant was made technological and strength calculations for the individual operations.
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Locally Supported Reinforced Concrete Slab
Kožušník, Přemysl ; Perla, Jan (referee) ; Požár, Michal (advisor)
The bachelor thesis deals with the design and assessment of selected load-bearing elements of the reinforced concrete structure of an office building. The elements include a locally supported floor slab above the 1st floor, a column and a footing. In addition, the design of a prefabricated staircase was carried out. The internal forces were analyzed using the finite element method in SCIA Engineer and the results were verified using the sum of moments method. The result of the work is a static calculation and drawings.
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Design of screw extruder for robotic 3D printing from pellets
Machač, Radim ; Škaroupka, David (referee) ; Křivohlavý, Petr (advisor)
The goal of this bachelor thesis was to design a screw extruder suitable for 3D printing, which will be able to process cheap plastic pellets instead of filament. The first part of the work is devoted to the extruder components, the extrusion process and the use of this polymer processing technology in the design of a screw extruder for 3D printing. An extruder model is created with regard to minimum dimensions and weight. During the design, requirements were set for ease of maintenance. The result is an extruder that enables both large-volume and small-volume printing, which, according to the calculations, is equal to the printing speed of ordinary 3D printers. This work will serve in the area of the usability of cheap plastic pellets as an input material for 3D printing. With its content, it also contributes to the development of screw extruder designs suitable for use in laboratories or industry.
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Housing production by cold forming
Kouřil, Jakub ; Kunčická, Lenka (referee) ; Jopek, Miroslav (advisor)
The bachelor thesis is focused on the production of a part by cold forming. The subject of the thesis is the design of the technology of production of a housing with a production rate of 6 000 000 pcs/year by extrusion and tamping. The austenitic stainless steel X5CrNi18-10 is used for the production. Based on simulations, the most suitable geometric configuration of the forming operations was selected. The whole production process consists of a first cutting, two forming and a last machining and radnishing operation. Based on the calculated forming force of 175,6 kN and the required power of 425 W, the CHUN ZU CBF-83S automatic forming machine was selected. At the same time, the tool is designed and in the end a techno-economic evaluation is carried out, which also includes the calculation of the piece price considering a 15% profit, which amounts to 1,24 CZK.
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Comparison of hydrolysis of selected phytomass after thermopressure preparation.
MAROUŠEK, Josef
Presented work compares the effect of mild extrusion on starchy and cellulose phytomass at different levels of intensity of acid (H2SO4, 3, 6, 9 and 12%), alkaline (NaOH, 3, 6, 9 and 12%) and enzymatic (4 enzyme preparations to hydrolysis of starch, 6 preparations for hydrolysis of cellulose and hemicellulose) hydrolysis. To measure the depth of hydrolysis is used GE and additionally alcohol yield. The positive impact of applied 0.3 MPa and 1MPa extrusion is also investigated by absorbance values and filter coefficients.
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Manufacturing of a connecting pin by cold forming
Koumar, František ; Peterková, Eva (referee) ; Jopek, Miroslav (advisor)
The diploma thesis is focused on the optimization of the production of a rotary connecting pin, produced by bulk cold forming with a focus on upsetting and forward and backward extrusion. The resulting pin will be made of 1.4511 steel. From the three proposed variants of production processes, the optimal variant for four forming operations was selected. Extrusion tools are made of tool steel 19 830. A numerical simulation was performed to verify the suitability of the sequence of the selected variant. The size of the production batch is set at 700,000 pieces / year. In the technical and economic evaluation, the calculated production price of 1 piece of part was coMPared between machining and volume forming, at which the production costs amount to CZK 6,64. The return on this method, with an assumed profitability of 10%, was found for 568 182 pieces produced.
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Static solution of parking house
Rose, Dominik ; Koláček, Jan (referee) ; Zich, Miloš (advisor)
The bachelor's thesis is focused on the elaboration of a static solution of a parking house with four above-ground floors. Three variants are elaborated, one of which was elaborated in more detail. The proposed elements are the ceiling slab, the columns and staircase. The SCIA Engineer 20.0 program is used to calculate the internal forces. As part of the work, drawing documentation is also prepared. The structure is designed according to correctly valid standards.
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Concrete flat slab supported by columns
Fárková, Karolína ; Švaříčková, Ivana (referee) ; Perla, Jan (advisor)
The aim of bachelor theses is to find out the internal forces on the point-supported reinforced concrete flat stab of a hospital buildingon the first floor.The analysis was performer using the following method: finite element method in Dlubal´s RFEM program, result were proved by the equivalent frame method. The structural assessment was performer according to ultimate and servicable limit states. The work also includes the desing of one column.
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Evaluation of dimensional and shape accuracy of components made of plastic
Tuza, Marek ; Dobrocký, David (referee) ; Sedlák, Josef (advisor)
The aim of this thesis is to evaluate the dimensional and shape accuracy of components made of plastic. A total of 10 samples, produced by two types of production, extrusion and 3D printing using the FFF method, were used for this purpose. The semi-finished products were milled after production, which resulted in samples of the required dimensions. The samples were milled on one side without cooling emulsion and on the other side with cooling emulsion, which significantly affected the resulting shape accuracy values. Thus, a total of 20 surfaces were evaluated. Two parameters were selected to evaluate the dimensions, namely distance and parallelism. When measuring the shapes, 11 parameters were evaluated using a 2D roughness profile and a 3D surface texture. One of the most used parameters that was evaluated when measuring shapes was the arithmetic mean deviation of the roughness profile, which is denoted as Ra. The research found that the highest accuracies were measured for the material PA produced by 3D printing and milled with a cooling emulsion. At the end of the practical part, the author also makes recommendations regarding the practical use of materials.
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