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Marginal conditions and their influence in the production of reinforced steel fibres in concrete
Loyková, Markéta ; Řiháček, Jan (referee) ; Císařová, Michaela (advisor)
Constantly increasing demands of customers for the speed of realization of the construction and reduction of all input costs have been reflected in civil engineering by high demand for reinforced steel fibers in concrete. The steel reinforcement has significant role in this composite material. This means that reinforcement (wires) provide the required physicochemical properties to the concrete. It is necessary to pay attention also to the marginal conditions and their influences in the production of wire. In close cooperation with the companies Krampe Harex CZ and Cemex Czech Republic, an analysis of the conditions of the drawing process and subsequent influence of dispersed steel reinforcement on the final product was created. The economic aspects of the production of dispersed steel reinforcement in concrete were also mentioned.
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Sheet metal forming using liquid
Fries, Petr ; Císařová, Michaela (referee) ; Řiháček, Jan (advisor)
This work is focused on unconventional technology using liquid as forming medium. The thesis presents the principle of forming methods hydroforming and its variations, wheelon, Flexform, hydromechanical drawing and explosive forming with examples of parts produced individual methods. A comparison of their advantages and disadvantages with conventional production methods.
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Types and characteristics of precision cutting methods
Hrtús, Vojtěch ; Císařová, Michaela (referee) ; Štroner, Marek (advisor)
Bachelor thesis deals with methods of precise cutting and their analysis. The methods used for production of small series were discussed only briefly due to their small occurrence in practice. In the case of fine blanking, an extensive search is made regarding the individual parameters influencing the quality of the shearing process. Furthermore, the work also deals with the shortcomings of the method and possible ways to modernize the technology, either in terms of quality of the shearing process or in terms of economy.
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Production of guiding disc
Slavík, Tomáš ; Peterková, Eva (referee) ; Císařová, Michaela (advisor)
The bachelor's thesis is focused on the design of the production of a guide disk made of sheet metal DC01 with a thickness of 3 mm. The production series is set to 100 000 pieces per year. Due to the required accuracy and size of the series, it was chosen that the guide disk will be made by the method of fine blanking. A coil of sheet metal has been chosen as the semi-finished product due to percentile of material usage and size of the series. For production will be needed a total of 24 coils of sheet with length of 308 m and one incomplete coil with a length of 132 m. The total force was calculated as Fc = 887,3 kN. Due to this strength, dimensions of the sheet and floor area of the tool, a triple-acting hydraulic press FEINTOOL XFT 1500speed was chosen for the production of the part. The last step was to check whether the size of the series is profitable or lossful. It was calculated that production becomes profitable at 49 554 pieces. Due to the size of the series, it can be stated that the production will be profitable.
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Production of sunshade's part
Obořil, Filip ; Harant, Martin (referee) ; Císařová, Michaela (advisor)
The work deals with the design of the manufacturing technology for the lateral covering fabrication of the sunshade. The part will be made of aluminium ČSN 42 4004 with thickness of 2mm. A manufacturing series comes to 100 000 per year. Some different manufacturing technologies were analyzed and the most suitable of them - the technology of fine-blanking with pushed edge was chosen. It was chosen the vertical laying of components on a sheet of aluminium roll. For production the servomechanical press XFT 1500 speed from FEINTOOL company was selected. In conclusion, economy of chosen manufacturing technology was evaluated.
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Manufacturing of biscuit pan
Pešava, Josef ; Císařová, Michaela (referee) ; Podaný, Kamil (advisor)
The solved part – the „cookie cutter“ is made of tin material TH 370 0,24 mm thick. It will be used for baking cookies at temperatures up to 250°C. Estimated annual series is 100 000 pieces. The most optimal method from the variant solution of the production of the part was chosen. In the first operation the circular rondel is cut from the sheet and there is the conventional campaign in the second operation. Based on calculations the nearest suitable press LEN 25 C is selected for the production. The price of 2,58 CZK per mold was calculated in, the technical-economic evalution. The pull tool is designed from technological and design calculations.
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Manufacturing of wheel holder for washing machine
Kopřiva, Tomáš ; Císařová, Michaela (referee) ; Podaný, Kamil (advisor)
The project is design technology components by cutting and bending. It is a component, which is used for attaching wheel of waching machine.It is manufactured from sheet steel. Analysis of suitable technologies for the production of manufacturing were selected in the combined processing tools. The tool uses standard components for cutting and bending, which is done on an eccentric press LEN 40 (manufacturer ŠMERAL Brno), with a nominal tensile force 400 kN. The prize of holder is about 8 Kč.
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Manufacturing of the TV Wall Bracket
Kráčmar, Lukáš ; Císařová, Michaela (referee) ; Peterková, Eva (advisor)
This master’s thesis conducted within the master's degree focuses on the design of production for component, which is a wall-mount the TV. The blank is sheet steel DC03 and the annual production is 300,000 pieces. After exploring possible options of manufacturing was chosen compound tool. In the theoretical part were explored technology used cutting and bending. Further, the manufacturing process and tool design were made. The suitability of the solution was verified by economic evaluation.
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The manufacture of cylindrical case by forming
Kratochvíl, Tomáš ; Císařová, Michaela (referee) ; Dvořák, Milan (advisor)
Bachelor theses done within bachelor study of specialization in an Engineering technology submits a proposal of production technology of a headless bushing by shaping. A proposed production technology of graded bushing involves an operation of cut-out of semifinished material, draw of an extract with the flange and a curtailment of the flange. The draw is made on the basis of calculation in three operations with the help of holder. According to graphical documentation the extract gets the final shape in the last operation of draw. The purpose of bachelor theses is a design of technological processing and elaboration of drawing documentation of an implement for making the headless bushing.
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Production of gear wheel
Tesař, Michal ; Řiháček, Jan (referee) ; Císařová, Michaela (advisor)
The work deals with the design of gear production technology and the required production series is 80,000 pieces per year. After evaluating various variants of gear production, the method of fine blanking with a vee-shaped was chosen, on which the literature search is also focused. The part will be made of material E 295 with a thickness of 2 mm and the semi-finished product is a coil of sheet metal. Part of the work is also the design of a tool, which is based on technological and control calculations. A three-acting press from the company Šmeral Brno FMB 440 was chosen as the machine. At the end of the work, an economic evaluation was performed.
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