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Workpiece geometrical accuracy measurement possibilities
Tvardek, Michal ; Musil, Martin (referee) ; Blecha, Petr (advisor)
The aim of this bachelor thesis is to do a research in the field of measurement of geometrical accuracy of workpiece. In the introduction I deal with the description and graphic interpretation of geometrical tolerances and parameters of the surface texture, including their illustration in the drawing documentation. Then I briefly summarized the major measuring methods of the chosen geometrical features and gear wheels. I also described the current equipment for measuring geometrical accuracy and surface texture for both inprocess and postprocess usage; meanwhile I tried to accentuate their main features and advantages.
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Development and weight reduction of central housing for commercial vehicles
Blecha, Martin ; Pittl, Michal (referee) ; Píštěk, Václav (advisor)
The theoretical part of the thesis is focused on the clarification of the central housing function and its placement in a truck. The central housing function and placement depend on a vehicle chassis design. There is the weight optimization of the housing which is solved in the practical part of the thesis. The optimization is based on strength calculations of the Finite Element Method. There are weight savings and financial savings evaluated at the end of the thesis.
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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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Design of multi-functional machining centre
Cvejn, Jiří ; Holub, Michal (referee) ; Blecha, Petr (advisor)
The purpose of this diploma thesis is a design of frame, crossbar, transverse feed, sliding feed of multifunctional machining center. In the first part, there is a brief research of history of machine tool conducted, division of machining centers, materials for frame construction, alternatives of drives of sliding axis. Further, I carry out an analysis of parameters of compeeting machine tools, from which I selected the parameters of our machine. Frame project of the machine, propulsion of axis X and Y, kinematic connection of axis X,Y,Z. Frame of machine is analysed by Finite Element Method. Over the scope of this work I suggest a solution for covering of linear axis as well as their measuring of actual position. 3D model of frame and drives of machine are included in this work. A complete formation has been introduced into the immersive virtual reality environment.
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Proposal of rotary pneumatic motor design
Vacek, Václav ; Drlík, Michal (referee) ; Blecha, Petr (advisor)
The bachelor thesis deal with proposal of rotary airmotor instead of rotary actuator. Based on overview of pneumatic airmotors will be performed proposal design of rotary airmotor. It was necessary to reach required torque and maximum dimensions. This bachelor thesis contains categorized overview of rotary airmotors and proposal of turbine airmotor complying required parameters.
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Design of multi-functional machining centre
Gruník, Jan ; Holub, Michal (referee) ; Blecha, Petr (advisor)
This work deals with the construction and describes a detailed calculation of a machine frame of the shaft-turning lathe and 2D axis passes including the underpass according to the chosen initial parameters. The information contained in this work is not only of theoretical knowledge, but it should also serve for the practical use as a guide for the frames construction. The work also contains a background research on the topic, the model frame, the frame strength analysis, optimization of the frame, 2D axis, calculation, design and implementation of the underpass and the whole assembly. A suggestion for the future procedure and optimizing of the existing structure is found in this work as well.
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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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Design of machine tool turntable
Záviška, Petr ; Holub, Michal (referee) ; Blecha, Petr (advisor)
This bachelor‘s thesis deals the design of turntable of machining machine. In the introductory part are presented some manufacturers of rotary tables for the selection of parameters of rotary table. Then it is made the design of turntable with indirect drive and the design of turntable with direct drive.
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Design of panel saw
Labský, Jiří ; Holub, Michal (referee) ; Blecha, Petr (advisor)
Object of this bachelor thesis is accomplished recherche about the panel saw. It provide design of construction of mechanical panel saw and basic construction calculation. In the first part of thesis is specification and distribution of panel saw available on the market. The second part of the thesis provide construction and calculation. In a conclusion of thesis is 3D model of panel saw mechanics and assembly drawing.
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