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Description of drilling machines
Bradáč, Tomáš ; Michalíček, Michal (referee) ; Blecha, Petr (advisor)
One part of this thesis concerns with recherche of drilling machines and in the other is made a description and a division of drilling machines of current production. This thesis describes suitability for use of those machines and the characteristics of individual types of machines. Chosen Czech and foreign manufacturer is listed by every type of machine together with one representative of given type. Given representative is pictured and a short characteristic is present together with basic technical parameters.
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PREDICTION OPERATIONAL ACCURACY OF THE CNC MACHINING CENTRE
Michalíček, Michal ; Blecha, Petr (referee) ; Skýpala, Milan (referee) ; Marek, Jiří (advisor)
The main research topic of this dissertation thesis deals with the influence of the working accuracy related to large CNC machines on the required workpiece properties. The state-of-the art has constantly been developed and the customer’s requirements directed to manufacturers of the machine tools are increasingly demanding. There is required a high accuracy, reliability, shortening delivery times etc. The manufacturer is expected to fulfill all the customer’s requirements. The machining accuracy is dependent, among others, on the positioning accuracy of a machine tool that represents the position of the cutting tool relative to a workpiece. The accuracy of a particular machine tool is therefore a limiting factor concerned with reaching the highest accuracy and quality of a workpiece. Acceptance test procedures are initially realized within a manufacturing shop floor and then within a customer environment. The main subject of the testing procedures is to verify. basic properties of a machine tool such as basic dimensions of a machine, strokes in all respective coordinates, machine travels and spindle speeds. A machining of a workpiece with a desired precision specified by the customer is also performed. In this thesis, a new methodology to calculate and determine errors concerned with machining on vertical lathes is proposed with the aim of predicting the machining accuracy of CNC machine tools. The objective of this work was to determine the influence of machining accuracy of a CNC machine in connection with a subsequent geometrical accuracy of a workpiece. Considered position of a tool relative to a workpiece will be affected by errors concerned with a kinematical inaccuracy, geometrical errors and errors related to machining forces. A vertical lathe SKIQ 30 produced by TOSHULIN, a.s. has been used as a testing machine on which the proposed methodology has been verified. During processing various calculations in this thesis there has been found out that the machining inaccuracy of the machine – main topic of interest – is influenced by the machining conditions such as cutting conditions, material to be machined and even the setting of working positions of the machine. For instance, a position of the cross slide is determined by a workpiece height and a position of the lathe carriage that is determined by a workpiece diameter and a travel of the slide that is also determined by a workpiece height. It can be stated then that to predict the machining accuracy of work pieces, it is important to know the behavior of the machine in its all range of working envelope. Based on the information acquired about the behavior of the machine, it can be determined an appropriate position for a workpiece setting that allows utilizing the maximum reachable accuracy with respect to the stiffness and geometrical accuracy of the machine tool. An appropriate setting of initial working position may influence the subsequent geometrical accuracy of a workpiece.
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Description of CYCLO-DRIVE gear box
Nádvorník, Jan ; Michalíček, Michal (referee) ; Kolíbal, Zdeněk (advisor)
This bachelor’s thesis contains a technical recherché which is deal with a principle working CYCLO-DRIVE gearboxes and its usage in practice. The work includes definitions of basic characteristic cycloidal gear, the primary parting of the cycloidal gearboxes and ways of alternative usages in comparison with common gearbox types. In the end are summarized the advantages and disadvantages of this gear.
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3D CAD software comparing.
Vévoda, Antonín ; Michalíček, Michal (referee) ; Dosedla, Michal (advisor)
3D CAD programs are currently among the most common tools for creating drawings in the editing of existing and developing new products. It also allows, inter alia, to support the design process of the various calculation and simulation modules. Selection of a suitable 3D CAD program is not a simple task. It was the aim of this work to develop a concise history of their development and a detailed summary of the currently common 3D CAD programs. In conclusion, there is summary of their suitability for application in various sectors of the engineering industry.
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Literature Review on Track Systems in Field of Machine-Tools
Šváček, Karel ; Michalíček, Michal (referee) ; Holub, Michal (advisor)
The main theme of this thesis is is a description of machine tools slide ways. More and more emphasis is laid on the accuracy of slide ways, because it is among the main parts that influences the exactness of of the mashine and thus the whole making process ass well. Materials that the sliding ways are made of are described here as well as their classification and their use with the CNC machines. The final summary of the thesis contents the evaluation.
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Comparing of the present and modern designing methods.
Krenželok, Andrzej ; Michalíček, Michal (referee) ; Dosedla, Michal (advisor)
Annotation: At present time we most often make constructions on the basis of previous knowledge with the use of intuition. For support of creativity and for the solution of difficult construction tasks we can use some modern contruction methods. Goal of Bachalor study is to define current and modern methods of construction (trial and error, transcendental, procedural and scientific) and confront them. Mentioned methods support the work of constructors and they are suitable for work in team and for individual too. Next will be formulated computers support of construction and CAx technology used by construction process.
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PREDICTION OPERATIONAL ACCURACY OF THE CNC MACHINING CENTRE
Michalíček, Michal ; Blecha, Petr (referee) ; Skýpala, Milan (referee) ; Marek, Jiří (advisor)
The main research topic of this dissertation thesis deals with the influence of the working accuracy related to large CNC machines on the required workpiece properties. The state-of-the art has constantly been developed and the customer’s requirements directed to manufacturers of the machine tools are increasingly demanding. There is required a high accuracy, reliability, shortening delivery times etc. The manufacturer is expected to fulfill all the customer’s requirements. The machining accuracy is dependent, among others, on the positioning accuracy of a machine tool that represents the position of the cutting tool relative to a workpiece. The accuracy of a particular machine tool is therefore a limiting factor concerned with reaching the highest accuracy and quality of a workpiece. Acceptance test procedures are initially realized within a manufacturing shop floor and then within a customer environment. The main subject of the testing procedures is to verify. basic properties of a machine tool such as basic dimensions of a machine, strokes in all respective coordinates, machine travels and spindle speeds. A machining of a workpiece with a desired precision specified by the customer is also performed. In this thesis, a new methodology to calculate and determine errors concerned with machining on vertical lathes is proposed with the aim of predicting the machining accuracy of CNC machine tools. The objective of this work was to determine the influence of machining accuracy of a CNC machine in connection with a subsequent geometrical accuracy of a workpiece. Considered position of a tool relative to a workpiece will be affected by errors concerned with a kinematical inaccuracy, geometrical errors and errors related to machining forces. A vertical lathe SKIQ 30 produced by TOSHULIN, a.s. has been used as a testing machine on which the proposed methodology has been verified. During processing various calculations in this thesis there has been found out that the machining inaccuracy of the machine – main topic of interest – is influenced by the machining conditions such as cutting conditions, material to be machined and even the setting of working positions of the machine. For instance, a position of the cross slide is determined by a workpiece height and a position of the lathe carriage that is determined by a workpiece diameter and a travel of the slide that is also determined by a workpiece height. It can be stated then that to predict the machining accuracy of work pieces, it is important to know the behavior of the machine in its all range of working envelope. Based on the information acquired about the behavior of the machine, it can be determined an appropriate position for a workpiece setting that allows utilizing the maximum reachable accuracy with respect to the stiffness and geometrical accuracy of the machine tool. An appropriate setting of initial working position may influence the subsequent geometrical accuracy of a workpiece.
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3D CAD software comparing.
Vévoda, Antonín ; Michalíček, Michal (referee) ; Dosedla, Michal (advisor)
3D CAD programs are currently among the most common tools for creating drawings in the editing of existing and developing new products. It also allows, inter alia, to support the design process of the various calculation and simulation modules. Selection of a suitable 3D CAD program is not a simple task. It was the aim of this work to develop a concise history of their development and a detailed summary of the currently common 3D CAD programs. In conclusion, there is summary of their suitability for application in various sectors of the engineering industry.
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