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Study cutting quality of flame cutting of limit thicknesses depending on the diameter of the focal spot during laser cutting of material
Maňas, Petr ; Kaván, Martin (referee) ; Mrňa, Libor (advisor)
Experimental work evaluated the dependence of the thickness of the cutting edge, its roughness and assessment of appearance with regard to the defects resulting from the diameter of the focal spot during oxidative cutting Yb:YAG laser. Other variables include the experiment: process parameters such as laser power, cutting speed, oxygen pressure and focus position. Experiment is based on the Taguchi tables. Test samples were cut off from sheet thickness 10, 15 and 20 mm. Representatives of conventional steel were S235JRC+N, S235JR, S235JR+N and steel type RAEX developed for laser and plasma cutting. Samples were evaluated according to the ČSN EN ISO 9013. The evaluation of samples was into classes according to standards of quality. Hardness measurements were performed on the samples thickness 20 mm of convectional steel and steel type RAEX.
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Optimization of a part production made of a structural 20 mm thick steel using laser cutting technology
Šoukal, Hynek ; Hála, Michal (referee) ; Mrňa, Libor (advisor)
The thesis deals with the optimization of process parameters in the oxidative laser cutting of structural 20 mm thick steel with regard to the type of material, the resulting roughness of the cut and the resulting price of the product. In line with the literary study and the Taguchi method, an experiment was developed. The cutting speed, laser performance, cutting gas pressure, and focal position were controlled during the experiment. Sample sets were cut with 7.5" and 10" focusing lens from the TATA STEEL S355MC and SSAB LASER 355 MC steels. According to ČSN EN ISO 9013, the samples were evaluated for roughness. Then micro and macro structures were evaluated, and compare the hardness according to Vickers. In conclusion, technical and economic evaluation was determined.
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Influence of process parameters on the roughness of the cut during laser cutting of stainless steel thickness 8 mm
Shkotova, Viktoriia ; Horník, Petr (referee) ; Mrňa, Libor (advisor)
This bachelor thesis deals with optimization of process parameters of laser CNC center. An IPG YLS-5000 solid state fiber laser was used in the experimental section for separating austenitic stainless steel X5CrNi 18-10 thickness 8 mm. Within the optimization, three parameters were changed: power, scroll speed and focus position. For each, a set of 10 samples was created. The roughness measurement and subsequent classification into the tolerance classes was based on ČSN EN ISO 9013. Although the changes in power did not show a bid differences in roughness, the tendency of the surface roughness decreases with the increase in the parameter value. The best results were achieved when the focus position and speed were changed. Samples 41 and 42 have a good surface quality, but there is a burst at the bottom edge. In the real situation, additional operations would be needed to remove them. Sample 61 has the smallest roughness surface without defects, but the cutting speed was almost twice lower than in samples 41 and 42. Because production time is very important from an economic point of view, it would be necessary to calculate the time for all used operations.
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Influence of process parameters on the roughness of the cut during laser cutting of stainless steel thickness 8 mm
Shkotova, Viktoriia ; Horník, Petr (referee) ; Mrňa, Libor (advisor)
This bachelor thesis deals with optimization of process parameters of laser CNC center. An IPG YLS-5000 solid state fiber laser was used in the experimental section for separating austenitic stainless steel X5CrNi 18-10 thickness 8 mm. Within the optimization, three parameters were changed: power, scroll speed and focus position. For each, a set of 10 samples was created. The roughness measurement and subsequent classification into the tolerance classes was based on ČSN EN ISO 9013. Although the changes in power did not show a bid differences in roughness, the tendency of the surface roughness decreases with the increase in the parameter value. The best results were achieved when the focus position and speed were changed. Samples 41 and 42 have a good surface quality, but there is a burst at the bottom edge. In the real situation, additional operations would be needed to remove them. Sample 61 has the smallest roughness surface without defects, but the cutting speed was almost twice lower than in samples 41 and 42. Because production time is very important from an economic point of view, it would be necessary to calculate the time for all used operations.
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Optimization of a part production made of a structural 20 mm thick steel using laser cutting technology
Šoukal, Hynek ; Hála, Michal (referee) ; Mrňa, Libor (advisor)
The thesis deals with the optimization of process parameters in the oxidative laser cutting of structural 20 mm thick steel with regard to the type of material, the resulting roughness of the cut and the resulting price of the product. In line with the literary study and the Taguchi method, an experiment was developed. The cutting speed, laser performance, cutting gas pressure, and focal position were controlled during the experiment. Sample sets were cut with 7.5" and 10" focusing lens from the TATA STEEL S355MC and SSAB LASER 355 MC steels. According to ČSN EN ISO 9013, the samples were evaluated for roughness. Then micro and macro structures were evaluated, and compare the hardness according to Vickers. In conclusion, technical and economic evaluation was determined.
|
|
|
Study cutting quality of flame cutting of limit thicknesses depending on the diameter of the focal spot during laser cutting of material
Maňas, Petr ; Kaván, Martin (referee) ; Mrňa, Libor (advisor)
Experimental work evaluated the dependence of the thickness of the cutting edge, its roughness and assessment of appearance with regard to the defects resulting from the diameter of the focal spot during oxidative cutting Yb:YAG laser. Other variables include the experiment: process parameters such as laser power, cutting speed, oxygen pressure and focus position. Experiment is based on the Taguchi tables. Test samples were cut off from sheet thickness 10, 15 and 20 mm. Representatives of conventional steel were S235JRC+N, S235JR, S235JR+N and steel type RAEX developed for laser and plasma cutting. Samples were evaluated according to the ČSN EN ISO 9013. The evaluation of samples was into classes according to standards of quality. Hardness measurements were performed on the samples thickness 20 mm of convectional steel and steel type RAEX.
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