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Construction of gears with plastic teeth
Selzer, Tomáš ; Vrbka, Martin (referee) ; Křupka, Jiří (advisor)
The thesis discusses the matter of construction of gear trains using plastic parts in both lubricated and non-lubricated environment, trying to give an overview of an up-to-date information in the process. Nowadays, thanks to several years of development, polymer-based gear systems can be used in many cases as a replacement for metal-based ones. The undeniable advantage of such replacement is mostly the lower production cost and its lower weight, which, together with favorable friction properties of polymer materials, makes a number of technological applications much more effective. The first part is dedicated to listing and defining the typical characteristics of polymer materials, which are essential in the process of designing the gear. The next part focuses on evaluation of the available types of solutions for plastic gear trains construction. The last topic is centered around possible defects and the wear as well as the operation conditions and a real-life application of such plastic gear system. The most notable findings are summed up and commented on in the form a discussion. Thanks to the chosen topic, the bachelor’s thesis adds to a closer understanding of the construction and operation of the plastic gear systems.
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Optimization of the assembly process of rack stackers in a manufacturing company
Selzer, Tomáš ; Macíčková, Zdeňka (referee) ; Píška, Miroslav (advisor)
This diploma thesis discusses the matter of an innovative assembly process of rack stackers within a manufacturing company. This type of assembly is currently executed in a stationary manner, meaning that the individual parts and subassemblies are being assembled at several designated stationary workplaces. This results in a high number of worked-on units and a fluctuating rate of unit completion. Therefore, the main aim is to develop and establish a new assembly process concept, which will increase the production capacity, lower the number of work-in-progress units and improve the fluency of the assembly process. The thesis is divided into a theoretical and a practical part. The former part’s introduction serves to make one familiar with the chosen manufacturing firm and its products. Next, individual theoretical solutions followed by their applications for the firm are described. These are as a result of a thorough research conducted on scientific literature, mainly scientific articles. The second half of the thesis is concerned with an analysis of the current state of assembly process, where the key efficiency factors are identified, as well as with the process of designing an assembly line, using the One-Piece Flow concept, meaning the workers are only working on a single unit and the parts and subassemblies are moved between the operations. The concept design includes: a selection of suitable types of stackers, an estimation of an appropriate takt time, an analysis of the current assembly process, a determination of the time necessary for assembly and a design of three possible layout solutions, from which, based on multiple criteria, the most suitable one was chosen.
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Optimization of the assembly process of rack stackers in a manufacturing company
Selzer, Tomáš ; Macíčková, Zdeňka (referee) ; Píška, Miroslav (advisor)
This diploma thesis discusses the matter of an innovative assembly process of rack stackers within a manufacturing company. This type of assembly is currently executed in a stationary manner, meaning that the individual parts and subassemblies are being assembled at several designated stationary workplaces. This results in a high number of worked-on units and a fluctuating rate of unit completion. Therefore, the main aim is to develop and establish a new assembly process concept, which will increase the production capacity, lower the number of work-in-progress units and improve the fluency of the assembly process. The thesis is divided into a theoretical and a practical part. The former part’s introduction serves to make one familiar with the chosen manufacturing firm and its products. Next, individual theoretical solutions followed by their applications for the firm are described. These are as a result of a thorough research conducted on scientific literature, mainly scientific articles. The second half of the thesis is concerned with an analysis of the current state of assembly process, where the key efficiency factors are identified, as well as with the process of designing an assembly line, using the One-Piece Flow concept, meaning the workers are only working on a single unit and the parts and subassemblies are moved between the operations. The concept design includes: a selection of suitable types of stackers, an estimation of an appropriate takt time, an analysis of the current assembly process, a determination of the time necessary for assembly and a design of three possible layout solutions, from which, based on multiple criteria, the most suitable one was chosen.
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Construction of gears with plastic teeth
Selzer, Tomáš ; Vrbka, Martin (referee) ; Křupka, Jiří (advisor)
The thesis discusses the matter of construction of gear trains using plastic parts in both lubricated and non-lubricated environment, trying to give an overview of an up-to-date information in the process. Nowadays, thanks to several years of development, polymer-based gear systems can be used in many cases as a replacement for metal-based ones. The undeniable advantage of such replacement is mostly the lower production cost and its lower weight, which, together with favorable friction properties of polymer materials, makes a number of technological applications much more effective. The first part is dedicated to listing and defining the typical characteristics of polymer materials, which are essential in the process of designing the gear. The next part focuses on evaluation of the available types of solutions for plastic gear trains construction. The last topic is centered around possible defects and the wear as well as the operation conditions and a real-life application of such plastic gear system. The most notable findings are summed up and commented on in the form a discussion. Thanks to the chosen topic, the bachelor’s thesis adds to a closer understanding of the construction and operation of the plastic gear systems.
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