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Building and control of 5-axis milling machines
Anderle, Milan ; Knobloch, Josef (referee) ; Holub, Michal (advisor)
This bachelor’s thesis studies the building and control of the five-axis CNC machining centres. Modern methods of geometric accuracy measurements are described with possibilites of compensating for geomeric and volumetric errors. Measuring devices described in this thesis are laser interferometer XL-80 and ballbar QC20-W for measuring geometric accuracy of MCV 754 Quick machine. The aim of the thesis is to describe current trends in construction, design and controlling of five-axis milling machines.
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Measurement of workpieces on machine tools using a touch probe
Velič, Samuel ; Marek, Tomáš (referee) ; Holub, Michal (advisor)
This diploma thesis deals with the influence of electronic compensation on accuracy of the measurement using the touch probe. The theoretical part concerns touch probes, specifically their classification, principles of working and applications. This part also includes devices used later in the experiment, particularly double ballbar, laser interferometer and LaserTRACER. The Practical part describes an experiment, demonstrating the correlation between the accuracy improvement of the touch probe and the electronic compensation’s level. All measurements were executed in accordance with the norm VDA 5 and were evaluated by the Matlab software. The graphs of reliance tolerance of capability of measurement on the length of the benchmark. At the end of this diploma thesis there are partial conclusions deduced. The deduction is based on generated graphs. The partial conclusions synoptically compare the influence of individual machine´s configurations on the accuracy of the touch probe.
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Impact of conventional compensation to the volumetric accuracy of the machine tool
Žák, Zdeněk ; Vetiška, Jan (referee) ; Holub, Michal (advisor)
This thesis solves the impact of conventional compensation to the volumetric accuracy of the CNC machine. It is therefore a practical research work, where are in the theoretical introduction mentioned requirements for machine tools, the types of errors that can occur on three-axis kinematics, compensation for the control system Siemens Sinumerik 840D sl and devices by means of which are these compensation under the work formed and subsequently verified. In this work can be seen the measured values and graphs from each measurements, a detailed analysis of the results and drawing conclusions from these results.
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Deformation measurement of turbocharger nozzle ring under temperature load
Kovářová, Lucie ; Žatko, Miroslav (referee) ; Dlugoš, Jozef (advisor)
The thesis is about deformation measurement of the nozzle ring in variable nozzle turbine mechanism under temperature load. In the first part, there is a brief description of the turbocharger. In the second part, methods of deformation measurement are mentioned there. The main part of the thesis includes component testing of selected measuring methods and their application for measuring deformation of the nozzle ring on the turbocharger. Test is done on a gas stand which simulates the thermal load conditions of the turbocharger, same which is exposed to on the engine.
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Atmospheric correction unit for the laser interferometer
Kučera, Stanislav ; Drexler, Petr (referee) ; Szabó, Zoltán (advisor)
This work deals with design, realization and testing the device for suppression the effect of the fluctuation of the atmospheric conditions on the laser interferometer measurement. Parasitic and randomly changes of atmospheric conditions – temperature, pressure, relative humidity and chemical composition of the air changes his refractive index, then wavelength of the laser light in this environment. Physical properties of air are measured by ultraprecision sensors. The actual wavelength is periodically calculated from Edlén formula. The device is processing the quadrature output signals from receiver of the homodyne interferometer include the atmospheric correction in real time. The device is equipped with interface to data acquisition into the personal computer.
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Assessing the influence of operating conditions on the resulting circularity and positioning accuracy
Sarvaš, Matej ; Marek, Tomáš (referee) ; Holub, Michal (advisor)
This thesis assesses the influence of operating conditions such as feed rate, position on the machine and temperature of individual machine components on the resulting positioning accuracy and circularity of a CNC machine. At the beginning, the current state of the art of the problem is described, such as types of machine accuracy, machine tool errors and their measurement. Subsequently, a system analysis of the problem is developed, where all the factors affecting the machine are described and a method for testing the machine is proposed. In the penultimate chapter, the proposed measurements are processed and in the last chapter they are evaluated.
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Calibration Of Precision Rotary Table Using Laser Interferometer System
Šindelář, Michal
Calibration of a rotary axis can be useful to determine angular deviations throughout themeasuring range. Specified accuracy presented in the specification list represents the worst case,therefore information about magnitudes of deviations of individual measuring points are unknown.The resulting error map of the device under test allows correction of the indicated value. As a result,the measurement accuracy of the device can be increased. Calibration of a precision rotary table wasperformed using a Keysight 5530 laser interferometer system. The presented paper briefly describesthe fundamentals of this portable calibrating system. Also, the results and accuracies are discussed.
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