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Study of cutting defects in flame cutting of limit thickness of carbon steel by fiber laser
Králík, Petr ; Hála, Michal (referee) ; Mrňa, Libor (advisor)
This thesis deals with research of cutting defects at laser cutting of 15 mm thick carbon steel by Bystronic fiber laser with emphasis on wide cutting gap, which causes enlargement of wide of cutting gap and deterioration of roughness of cutting edge and increase of creation fo heat. The introduction describes the main types of lasers used for cutting sheet of metal and compare their advantages and disadvantages. Also described is a cutting process and its parameters, and also the possible cutting defects. An experiment was conducted on steels S355MC and S235JR and cutting defects were analyzed in relation to the set of cutting parameters. Next part determines the extent of the recommended parameters that should be chosen for specific cutting conditions and is balanced recommendations regarding the choice of material to be cut, and technological adaptations parts. In the last part is measured roughness of a wide cutting gap, the width of the heat affected zone and micro-hardness of the material.
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Technical and economic evaluation of the use of oxygen or nitrogen as the cutting medium during laser cutting of sheet metal.
Králík, Petr ; Osička, Karel (referee) ; Mouralová, Kateřina (advisor)
This thesis deals with a production issue for an engineering company - the optimal method for laser cutting. The options considered are the fusing method of cutting or the oxidising method, utilising the Lissmac SBM-M 1500 B2 equipment - designated for cleaning the oxidising a layer from the incision area. Initially, the cost of machine maintenance was calculated within a continuous production environment. Data was collected from a single month’s production and the potential savings for the processional gas were calculated through the pressure and flow values. In addition, electricity savings and the increased production capacity were calculated due to the higher cutting speed achieved by oxidizing cutting. From the gained data, a graph was created of the investment recovery time for 100%, 50% and 0% of the new created capacity use. Finally, measures for the highest profit from the investment were recommended.
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Study of cutting defects in flame cutting of limit thickness of carbon steel by fiber laser
Králík, Petr ; Hála, Michal (referee) ; Mrňa, Libor (advisor)
This thesis deals with research of cutting defects at laser cutting of 15 mm thick carbon steel by Bystronic fiber laser with emphasis on wide cutting gap, which causes enlargement of wide of cutting gap and deterioration of roughness of cutting edge and increase of creation fo heat. The introduction describes the main types of lasers used for cutting sheet of metal and compare their advantages and disadvantages. Also described is a cutting process and its parameters, and also the possible cutting defects. An experiment was conducted on steels S355MC and S235JR and cutting defects were analyzed in relation to the set of cutting parameters. Next part determines the extent of the recommended parameters that should be chosen for specific cutting conditions and is balanced recommendations regarding the choice of material to be cut, and technological adaptations parts. In the last part is measured roughness of a wide cutting gap, the width of the heat affected zone and micro-hardness of the material.
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Technical and economic evaluation of the use of oxygen or nitrogen as the cutting medium during laser cutting of sheet metal.
Králík, Petr ; Osička, Karel (referee) ; Mouralová, Kateřina (advisor)
This thesis deals with a production issue for an engineering company - the optimal method for laser cutting. The options considered are the fusing method of cutting or the oxidising method, utilising the Lissmac SBM-M 1500 B2 equipment - designated for cleaning the oxidising a layer from the incision area. Initially, the cost of machine maintenance was calculated within a continuous production environment. Data was collected from a single month’s production and the potential savings for the processional gas were calculated through the pressure and flow values. In addition, electricity savings and the increased production capacity were calculated due to the higher cutting speed achieved by oxidizing cutting. From the gained data, a graph was created of the investment recovery time for 100%, 50% and 0% of the new created capacity use. Finally, measures for the highest profit from the investment were recommended.
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