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Prediction of Selected Parameters of Rotational Kinematics Pairs of Machine Tools
Marek, Tomáš ; Šooš, Ĺubomír (referee) ; Kolář, Petr (referee) ; Blecha, Petr (advisor)
The dissertation thesis is used as a methodology for prediction of selected parameters of rotational kinematic pairs of machine tools. The motivation for its writing has been continually increasing requirements for parameters (performance, accuracy, static and dynamic stiffness) of machine tools. The methodology takes into account the availability of suitable measuring devices and description of the design of rotary kinematic pairs. It will be useable for predicting the behavior of rotational kinematic pairs, even at the design stage by applying results to the machine design. The work is processed so that first is used a system approach to suggest methodology for prediction of the behavior of rotary kinematic pair in CNC machine tools, planning measurement strategy and verifying the results, including applications for specific kinematic chain of the selected machine. Based on this system approach and the resulting methodology, the measurement of the rotary kinematic pair was performed. The results of the system approach and measurement are generalized in the form of recommendations for designers of machining centers, allowing to increase the accuracy of the rotational kinematic pair.
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Systems Methodology by Linear AXIS Design of a Heavy Machine Tool
Hermanský, Dominik ; Šooš, Ĺubomír (referee) ; Suchánek, Rostislav (referee) ; Marek, Jiří (advisor)
The dissertation thesis deals with the possibility of a new approach to the design of a linear axis for a heavy machine tool using a system approach and advanced simulation tools based on the finite element method. The result of the thesis is a general methodology applicable in the development and design of heavy machine tools of any kinematic configuration, regardless of the required operating parameters of the machine. The thesis is designed so that using a system approach, a methodology is created and then the procedure for creating a complex computational model, which is necessary for the methodology, is described in detail. Case studies were carried out on the basis of a system approach and the methodology of linear axis design and the creation of a complex model created from it. The obtained results were verified by experimental methods. The achieved results can be used in industry in the design stage of a CNC heavy machine tool for the design and computation department.
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Compensation of Linear Encoder of Maching Center
Štěpánek, Vojtěch ; Šooš, Ĺubomír (referee) ; Suchánek, Rostislav (referee) ; Marek, Jiří (advisor)
A CNC machine tool is a complex mechatronic system whose behaviour is influenced by a change in temperature gradient. Nowadays, we could state that under certain conditions it is a cyber-physical system. From this point of view, there are two approaches to solve this problem. One direction solves the whole machine using a suitable method as a whole. Models are often very complex and their reliability is often questi-onable. This work deals with the decomposition of the machine using a systems approach, with the intention of finding the dependencies between the geometric error of the on-axis position accuracy and the temperature gradient. Then, using a suitable virtual model, predict the evolution of the temperature error and based on this prediction, make actionable interventions in the machine tool control system to eliminate the on-axis homing error as much as possible. One of the basic building blocks of the machine tool in terms of positioning is the linear encoder, which acts as a direct feedback member of the axis position control. Therefore, this publication is mainly devoted to the thermal behaviour of the linear encoder.
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Systems Methodology by Linear AXIS Design of a Heavy Machine Tool
Hermanský, Dominik ; Šooš, Ĺubomír (referee) ; Suchánek, Rostislav (referee) ; Marek, Jiří (advisor)
The dissertation thesis deals with the possibility of a new approach to the design of a linear axis for a heavy machine tool using a system approach and advanced simulation tools based on the finite element method. The result of the thesis is a general methodology applicable in the development and design of heavy machine tools of any kinematic configuration, regardless of the required operating parameters of the machine. The thesis is designed so that using a system approach, a methodology is created and then the procedure for creating a complex computational model, which is necessary for the methodology, is described in detail. Case studies were carried out on the basis of a system approach and the methodology of linear axis design and the creation of a complex model created from it. The obtained results were verified by experimental methods. The achieved results can be used in industry in the design stage of a CNC heavy machine tool for the design and computation department.
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Prediction of Selected Parameters of Rotational Kinematics Pairs of Machine Tools
Marek, Tomáš ; Šooš, Ĺubomír (referee) ; Kolář, Petr (referee) ; Blecha, Petr (advisor)
The dissertation thesis is used as a methodology for prediction of selected parameters of rotational kinematic pairs of machine tools. The motivation for its writing has been continually increasing requirements for parameters (performance, accuracy, static and dynamic stiffness) of machine tools. The methodology takes into account the availability of suitable measuring devices and description of the design of rotary kinematic pairs. It will be useable for predicting the behavior of rotational kinematic pairs, even at the design stage by applying results to the machine design. The work is processed so that first is used a system approach to suggest methodology for prediction of the behavior of rotary kinematic pair in CNC machine tools, planning measurement strategy and verifying the results, including applications for specific kinematic chain of the selected machine. Based on this system approach and the resulting methodology, the measurement of the rotary kinematic pair was performed. The results of the system approach and measurement are generalized in the form of recommendations for designers of machining centers, allowing to increase the accuracy of the rotational kinematic pair.
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