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Precision forging
Berka, Martin ; Peterková, Eva (referee) ; Lidmila, Zdeněk (advisor)
This bachelor´s thesis deals with the technology of precision forging. The thesis describes basic distribution of the forging according to the nature of the material flow and his procedure. After the introductory part this thesis deals with the analysis of the methods of the drop forging with fin groove. The next section contains a description, parameters and methods of precision forging. Technical a economical evaluation of the component technology is as a conclusion of the thesis.
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Producing 100 mm caliber shell
Santa, Patrik ; Harant, Martin (referee) ; Lidmila, Zdeněk (advisor)
The bachelor’s thesis is focused on producing 100 mm caliber shell. It’s a cylindrical component with variable thickness of the wall. Material used is brass CuZn30. After evaluation of different producing options, deep drawing was chosen as the most convenient technology. Semi-finished product is round blank from which, using deep drawing, a cup will be shaped. Subsequently using technology of deep drawing with wall thinning, wall thickness will be reduced to a required dimension. Shearing runs on a hydraulic press FB one 8800 and deep drawing is provided by hydraulic press YW27-1000A. Machines used were selected on the basis of calculated forces. Also a drawing documentation was processed for the last draw and for a mold used for narrowing the orifice.
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Development of Long-pitch Corrugation in Curves of Small Radii
Valehrach, Jan ; Kohout,, Martin (referee) ; Lidmila,, Martin (referee) ; Plášek, Otto (advisor)
Throughout the operation, the rails are worn and deteriorate. With the increasing speed of rolling stock, along with higher track loads and especially in the vicinity of major traffic hubs with a higher frequency of trains, defects that did not occur to such an extent before or were not considered to be significant, are brought to the forefront of the concerns of track infrastructure managers. Even though these defects are not directly restrictive to traffic operation, they are, in any case, a source of noise and vibration. One of these defects on the railway track is the micro-geometry defect of the running surface of the railhead. In directional curves with radii of less than 600 m or 700 m, defects known as long-pitch corrugation occur on the inner rail. In curves with 300 m or smaller radii, these waves are so distinct that they are a significant source of noise and vibration. In particular, vibrations affect the track surroundings and the track itself, as they cause other defects in the track structure. This dissertation deals with long-pitch corrugation, focusing on the monitoring of wave generation and development over time. The verification of the possibility to track the development of slip waves over time is the basis for possible future models predicting the development of defects. Numerous measurements of geometric parameters of the track and microgeometry of the railheads, specifically slip waves, have been carried out in the framework of the problem. Using RMS and peak-to-peak methods, the rate of development of defects over time and the relationship with other track parameters were evaluated. Based on the obtained development curves, intervals for further maintenance interventions were estimated. A part of the thesis focuses on the deficiency or excess of cant concerning the development of long-pitch corrugation.
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Manufacturing of dice
Doušek, Martin ; Lidmila, Zdeněk (referee) ; Podaný, Kamil (advisor)
The advertising (playing) dice is used for playing games and concurrently as promotional device to showing up company in the process of transfer events in full view of the public. The element is made of a structural steel 11 373, the production series are 5000 units per year. Produced component has a lenght of 220 mm, a width of 165 mm and a thickness of 1,5 mm. The variant solution was as optimal technology selected combination of rolling cutting followed by three folds in three separate instruments. It were made technological and structural calculations of which were devised tools, for which was made a basic drawing documentation. For production from total deformation force was chosen eccentric press S 250 with rated energy 2 500 kN. In the next step were fixed costs to produce one piece with the production of a advertising dice with energy, wages and material is 12,75 CZK.
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Producing small rage shell
Bek, Martin ; Císařová, Michaela (referee) ; Lidmila, Zdeněk (advisor)
The bachelor's thesis focuses on the production of a small rage shell and the choice of a suitable technology. Brass with the designation MS70 is chosen as the material, according to ČSN 423210. Brass is a suitable material for cold forming. Due to the high number of pieces produced per year, the combination of two technologies proved to be the most economical variant. First technology is back extrusion technology. The input semi-finished product is a calibrated cylinder and the output product is a cup. Subsequently, the cartridge is made by drawing with thinning the wall. This method of manufacturing the shell is advantageous mainly due to the excellent use of the material and, in contrast to sheet metal forming, there is no high proportion of waste from sheet metal. The material is supplied in bars and cut into precise blanks that correspond in volume to the finished shell. Extrusion and drawing tools are shown in the accompanying technical drawings.
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Producing big rage shell
Doležel, Martin ; Císařová, Michaela (referee) ; Lidmila, Zdeněk (advisor)
The bachelor's thesis presents a proposal for the technological process of production of a big rage shell, the semi-finished product of which is a circular roundel made of non-alloy steel DD11. Based on the study part and the subsequent technological part, drawing without wall thinning and with wall thinning is proposed. The drawing is carried out on a hydraulic progressive six operating press PO 400 P with a forming force of 4,000 kN. Cutting of blanks is performed on an eccentric press LE 400 D. One part of this thesis is the design of a tool for drawing without thinning the wall and a tool for the last operation of drawing with thinning the wall. These tools are made of 19,436 steel according to the drawing documentation.
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Development of Long-pitch Corrugation in Curves of Small Radii
Valehrach, Jan ; Kohout,, Martin (referee) ; Lidmila,, Martin (referee) ; Plášek, Otto (advisor)
Throughout the operation, the rails are worn and deteriorate. With the increasing speed of rolling stock, along with higher track loads and especially in the vicinity of major traffic hubs with a higher frequency of trains, defects that did not occur to such an extent before or were not considered to be significant, are brought to the forefront of the concerns of track infrastructure managers. Even though these defects are not directly restrictive to traffic operation, they are, in any case, a source of noise and vibration. One of these defects on the railway track is the micro-geometry defect of the running surface of the railhead. In directional curves with radii of less than 600 m or 700 m, defects known as long-pitch corrugation occur on the inner rail. In curves with 300 m or smaller radii, these waves are so distinct that they are a significant source of noise and vibration. In particular, vibrations affect the track surroundings and the track itself, as they cause other defects in the track structure. This dissertation deals with long-pitch corrugation, focusing on the monitoring of wave generation and development over time. The verification of the possibility to track the development of slip waves over time is the basis for possible future models predicting the development of defects. Numerous measurements of geometric parameters of the track and microgeometry of the railheads, specifically slip waves, have been carried out in the framework of the problem. Using RMS and peak-to-peak methods, the rate of development of defects over time and the relationship with other track parameters were evaluated. Based on the obtained development curves, intervals for further maintenance interventions were estimated. A part of the thesis focuses on the deficiency or excess of cant concerning the development of long-pitch corrugation.
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Music Therapy with pre-school children
Čadek, Martin ; Valentová, Lidmila (advisor) ; Doubek, David (referee)
Following study is about music therapy processes within group of preschoolers attending music therapy sessions. The study is directed on group dynamics processes in small group. The main research question is: "Which phenomenons occur in group dynamic process of group integrity and group de-integrity?" these concepts of deintegrity and integrity are linked theoretically with concept of cohesion and tension. The concept of cohesion and tension leads the group into two group states. The first one can be characterized as "cohesiveness" and the following is characterized as "moving apart". The results of study outline what kinds of factors can be found for cohesion and tension for small group of preschoolers in music therapy sessions.
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Producing 100 mm caliber shell
Santa, Patrik ; Harant, Martin (referee) ; Lidmila, Zdeněk (advisor)
The bachelor’s thesis is focused on producing 100 mm caliber shell. It’s a cylindrical component with variable thickness of the wall. Material used is brass CuZn30. After evaluation of different producing options, deep drawing was chosen as the most convenient technology. Semi-finished product is round blank from which, using deep drawing, a cup will be shaped. Subsequently using technology of deep drawing with wall thinning, wall thickness will be reduced to a required dimension. Shearing runs on a hydraulic press FB one 8800 and deep drawing is provided by hydraulic press YW27-1000A. Machines used were selected on the basis of calculated forces. Also a drawing documentation was processed for the last draw and for a mold used for narrowing the orifice.
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Producing small rage shell
Bek, Martin ; Císařová, Michaela (referee) ; Lidmila, Zdeněk (advisor)
The bachelor's thesis focuses on the production of a small rage shell and the choice of a suitable technology. Brass with the designation MS70 is chosen as the material, according to ČSN 423210. Brass is a suitable material for cold forming. Due to the high number of pieces produced per year, the combination of two technologies proved to be the most economical variant. First technology is back extrusion technology. The input semi-finished product is a calibrated cylinder and the output product is a cup. Subsequently, the cartridge is made by drawing with thinning the wall. This method of manufacturing the shell is advantageous mainly due to the excellent use of the material and, in contrast to sheet metal forming, there is no high proportion of waste from sheet metal. The material is supplied in bars and cut into precise blanks that correspond in volume to the finished shell. Extrusion and drawing tools are shown in the accompanying technical drawings.
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