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Weldability of steels for the manufacture of bicycle frames
Grim, Robert ; Richter, Tomáš (referee) ; Vaněk, Mojmír (advisor)
This thesis is focused on steel materials used in bicycle frame manufacturing. The alloys are analysed based on their mechanical properties as well as their weldability. Steel materials are divided into three groups corresponding to the foremost frame manufacturers. Alloys with trade names are paired with equivalent normalized materials selected according to their chemical composition. The weldability of individual steels is addressed in several chapters sorted by materials’ mechanical properties and structure. The work further explains why TIG welding of frames is preferred and what the method’s main advantages are.
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Deformation, stress and safety analysis of the bicycle frame.
Ondrejka, Jan ; Vosynek, Petr (referee) ; Vrbka, Jan (advisor)
The aim of this bachelor thesis is to assess complience and safety of the bicycle frame with basic elasticity approach, namely by deformation and stress analysis. After model simplyfying, two different cases were made. Difference between these two were in loads aplied on the frame. Maple 12.0 softwarre was used for calculation, Autodesk Inventor and AutoCAD were used for sketches. The results were checked with ANSYS Workbench.
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Welding of bike frames
Kotrík, Marcel ; Daněk, Ladislav (referee) ; Kubíček, Jaroslav (advisor)
In my bachelor thesis I elaborated an overview of suitable materials for the manufacturing of bicycle frames. Most preferred materials for mass production of bicycle frames are cured aluminum alloys. The best method for joining aluminum tubular frame construction is fusion welding at robot lines in a protective atmosphere of inert gas. We measured the hardness of the welded metal, heat affected zone and base material at the weld of the bicycle frame. Values are very similar in all areas, so the whole frame structure was cured. We welded a test weld, using TIG method. Hardness of the test weld is about 24.5 % lower, than hardness of the weld from manufacturer. Hardness of the heat affected zone is even lower. The curing of the whole frame construction is therefore very important. There is a concentration cavity in the cut of the weld from manufacturer and the root of the weld is not welded all over. The same defects are in the cuts of our test welds, there is also porosity in one of the test welds. But the test weld is satisfying, despite the defects.
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Hydroforming machine for non-ferrous material tubes
Ocelík, Jakub ; Holub, Michal (referee) ; Knoflíček, Radek (advisor)
Master`s thesis deals with unusual high-pressure-fluid forming technology – hydroforming. There are discussed factors, which are affecting forming process, and there are made conclusion of it for machine design process. There is also made an evaluation of tube hydroforming technology in nowadays. The objective of thesis is to design new forming machine for tube hydroforming and for use in bicycle frames design. The machine is to be determined for manufacturing series up to 1000 pieces. Based on calculations and discussion of hydroforming technology, the best design solution is chosen. Machine is designed as modular conception with pressure multiplication of forming fluid right in die cavity. There is no need to use high pressure pump for forming fluid, used in common machines for tube hydroforming. This leads to cost reduction and so the objective of thesis is accomplished.
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Welding of bike frames
Kotrík, Marcel ; Daněk, Ladislav (referee) ; Kubíček, Jaroslav (advisor)
In my bachelor thesis I elaborated an overview of suitable materials for the manufacturing of bicycle frames. Most preferred materials for mass production of bicycle frames are cured aluminum alloys. The best method for joining aluminum tubular frame construction is fusion welding at robot lines in a protective atmosphere of inert gas. We measured the hardness of the welded metal, heat affected zone and base material at the weld of the bicycle frame. Values are very similar in all areas, so the whole frame structure was cured. We welded a test weld, using TIG method. Hardness of the test weld is about 24.5 % lower, than hardness of the weld from manufacturer. Hardness of the heat affected zone is even lower. The curing of the whole frame construction is therefore very important. There is a concentration cavity in the cut of the weld from manufacturer and the root of the weld is not welded all over. The same defects are in the cuts of our test welds, there is also porosity in one of the test welds. But the test weld is satisfying, despite the defects.
|
|
|
Hydroforming machine for non-ferrous material tubes
Ocelík, Jakub ; Holub, Michal (referee) ; Knoflíček, Radek (advisor)
Master`s thesis deals with unusual high-pressure-fluid forming technology – hydroforming. There are discussed factors, which are affecting forming process, and there are made conclusion of it for machine design process. There is also made an evaluation of tube hydroforming technology in nowadays. The objective of thesis is to design new forming machine for tube hydroforming and for use in bicycle frames design. The machine is to be determined for manufacturing series up to 1000 pieces. Based on calculations and discussion of hydroforming technology, the best design solution is chosen. Machine is designed as modular conception with pressure multiplication of forming fluid right in die cavity. There is no need to use high pressure pump for forming fluid, used in common machines for tube hydroforming. This leads to cost reduction and so the objective of thesis is accomplished.
|
|
|
Weldability of steels for the manufacture of bicycle frames
Grim, Robert ; Richter, Tomáš (referee) ; Vaněk, Mojmír (advisor)
This thesis is focused on steel materials used in bicycle frame manufacturing. The alloys are analysed based on their mechanical properties as well as their weldability. Steel materials are divided into three groups corresponding to the foremost frame manufacturers. Alloys with trade names are paired with equivalent normalized materials selected according to their chemical composition. The weldability of individual steels is addressed in several chapters sorted by materials’ mechanical properties and structure. The work further explains why TIG welding of frames is preferred and what the method’s main advantages are.
|
|
|
Deformation, stress and safety analysis of the bicycle frame.
Ondrejka, Jan ; Vosynek, Petr (referee) ; Vrbka, Jan (advisor)
The aim of this bachelor thesis is to assess complience and safety of the bicycle frame with basic elasticity approach, namely by deformation and stress analysis. After model simplyfying, two different cases were made. Difference between these two were in loads aplied on the frame. Maple 12.0 softwarre was used for calculation, Autodesk Inventor and AutoCAD were used for sketches. The results were checked with ANSYS Workbench.
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