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System for measuring of thermal efficiency of solar absorbers
Řiháček, Jan ; Podaný, Kamil (referee) ; Mrňa, Libor (advisor)
The thesis deals with the measurement system for determining the thermal efficiency of the newly developed types of solar absorbers. Measuring equipment allows simultaneous indoor or outdoor thermal efficiency detection of up to four samples absorbers. Emphasis is placed on the flow and heat transfer medium temperature changes. For this purpose is used Biotech FCH-m-POM-LC and LM35DZ sensors. Sensor signal is transferred to a PC using the measuring module NI USB-6221. Here it is further processed by proposed evaluation program. The software is implemented in LabVIEW integrated development environment. In a final part are performed a verification measurements to assess system performance and evaluate the thermal efficiency of various types of solar absorbers. This path is also demonstrated high efficiency applications absorbent layer coating color RABSORB 5.
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Upsetting test and its importance for practice
Zapletalová, Martina ; Řiháček, Jan (referee) ; Podaný, Kamil (advisor)
This thesis was aimed at verifying the accuracy of the evaluation of upsetting test. Experiments were carried out on cylindrical samples of steel 16 231.3 with solid lubricant Delta 144. Comparing the output values that were recorded classical way through the liner recorder and amplifier at press CZR 600. The Results have been processed using measuring module and program made by company Dewesoft. Last trio of samples was tested by upsetting test in a universal machine ZD 40, which was connected to the control unit and the data was processed by M-TEST program. From the plotted working curves and curves deformational resistance can be concluded that a liner recorder and amplifier can be effectively innovated by measuring module and by program.
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Optimalization of parts bonded by hot crimping
Liškář, Ladislav ; Řiháček, Jan (referee) ; Lidmila, Zdeněk (advisor)
The thesis describes the procedure for verifying the conceptual ideas of the company. Design and production of prototypes, testing and evaluation, quantifying savings. Two variants of crimped bond were chosen. For each was length of shaft changed to three and four crimped grooves. These prototypes were tested in two static and one dynamic tests. Recommendation for company is continue with other phases of development for shaft with four grooves.
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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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Manufacturing possibilities of modular cabinet
Valčík, Martin ; Řiháček, Jan (referee) ; Podaný, Kamil (advisor)
Bachelor's dissertation in subject Mechanical Engineering is focused on suggestion and evaluation suitable of technologies which are used for production of modular cabinet determined for switchboard cabinets STX, serial marking IP55/IK09 produced by company TVD - Technická výroba, Inc.. Technologies used for production are punching, cutting by laser or plasma beam, bending, welding MAG/MIG, WIG and spot welding. Surface finish is done by powder painting, zinc plating or anodization. In point of economical and quality view as the best procedure was choosed punching, bending, welding by MAG technology and powder painting.
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Use of liquid in a sheet metal forming
Rejnuš, Vojtěch ; Řiháček, Jan (referee) ; Podaný, Kamil (advisor)
The liquid is used as the main or supporting forming medium. It is also used in series production of komplex and precision parts. It ranks among the more progressive methods and can be used among other aplications used for hydromechanical drawing, Pillow forming, Hydroform, Wheelon, ASEA, Flexform, new method Triform, explosion and electrohydraulic forming. Principles are presented for selected methods, as well as advantages, disadvantages and examples of practical applications.
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Methods of 3D bending
Kráčmar, Lukáš ; Řiháček, Jan (referee) ; Peterková, Eva (advisor)
The project is developed in the context of a bachelor's degree in Mechanical Engineering and deals with an overview of modern methods of 3D bending part. The paper presents the different methods of 3D bending components that are produced by these methods and machines on which these components produce.
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Machinery used for drop forging
Vondráček, Petr ; Řiháček, Jan (referee) ; Podaný, Kamil (advisor)
The bachelor thesis contains distribution and overview of the machines used in the proces of die forging and their modern innovation. For individual mechanism is described principle, structural arrangements and advantages or disadvantages, or the example of used machine for which is described his charaterisctic, basic parameters and productions possibilities with example of made forged.
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System for evaluation of upsetting test
Janečka, Dominik ; Podaný, Kamil (referee) ; Řiháček, Jan (advisor)
The thesis deals with the proposal of measurement system for evaluating upsetting test. The variables for evaluating the test are obtained by using sensors of measuring devices. The necessary magnitudes are force, track and temperature. For this purpose they were used sensors HBM R6C, HBM W50 and thermocouple type K. The sensor signals are amplified by measuring modules Dewetron and transferred to a PC by measuring card NI USB-6009. There are further processed by evaluation program DEWESoft 6.5. In a final part are performed a verification measurements to assess system function.
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Manufacturing of cylinder holder by fineblanking technology
Piterka, Miloslav ; Peterková, Eva (referee) ; Řiháček, Jan (advisor)
The thesis is focused on production of a cylinder holder, which has been made from stainless steel 17 240. The product is 6 mm thick and there are 200 000 pieces produced per a year. After analysis of manufacturing technology there has been selected fine-blanking technology with v-ring for production of these components. For this reason there has been developed a study. Then there have been evaluated the technological and control parameters of the components. There has been selected the single row arrangement on the sheet of tin and chosen a stock of blank metal sheet for manufacturing with strict measurements (8 x 1 000 x 2 000) mm. There has been made the suggestion of design of a cutting tool. Hydraulic press Feintool HFA 8800plus has been selected for the final production. Eventually there has been evaluated the economics of production of fine-blanking with v-ring due to break even point.
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