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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 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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K charakterizaci Vočadlova modelu pomocí postupu zpětného vytlačování
Filip, Petr ; David, Jiří ; Pivokonský, Radek
Back extrusion represents one of the cheapest and time-saving experimental methods how to determine rheological characteristics of the fluids studied. This method is based on plunging of a circular rod into an axisymmetrically located circular cup containing the experimental sample. Formerly this method was successfully applied to power-law, Bingham and Herschel-Bulkley fluids. The aim of this contribution is to present a sufficiently simple user-friendly procedure how to determine the individual rheological parameters appearing in the Vočadlo model (sometimes called Robertson-Stiff one) - yield stress, consistency parameter and flow behaviour index.
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