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Measurement of Surface Texture Parameters of Products Using Contact and Non-contact Methods
Harčarík, Matej ; Hammer, Miloš (referee) ; Jankových, Róbert (advisor)
This master’s thesis includes an overview of profile method of surface texture evaluation according to ISO standards and VDA automotive standards, as well as an overview of areal method according to ISO 25178 standard series, which includes a proposal for improvement of czech terminology. Suitability of application of selected measurement methods for measurement of a portfolio of automotive parts was evaluated based on measurements carried out using a contact profiler, a coherence scanning interferometer and a confocal microscope. Further recommendations for practice in surface texture metrology were also formulated. A regression analysis of the relationship between values of selected profile surface texture parameters and their areal equivalents was also performed. Its results may aid the spread of areal surface texture evaluation in the industry.
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Advanced methods of surface topography evaluation
Hroděj, Daniel ; Osička, Karel (referee) ; Píška, Miroslav (advisor)
This paper deals with the analysis of data obtained from the surface of aluminum alloy 7475-T7351 after face milling with a tool inclination of 1°. The theoretical part explains the basic principles of measuring the topography of the surface and instruments that are able to provide relevant data directly from the scanned part. The following part contains the methods of evaluating the information, especially using various types of parameters acquired from ČSN EN ISO standards. The practical part focuses on the data obtained from the sample surface using the Alicona IF-G5. This information determines the character of the surface texture with the tool inclination and the difference between the profile and surface parameters. There is also described surface texture in the tool path and on the edge of the tool path. In the final economic evaluation, the connection between the feed per tooth and the machining price is found.
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Use of Surface Texture Parameters for Conformity Assessment and Process Control
Špačková, Magda ; Jankových, Róbert (referee) ; Harčarík, Matej (advisor)
This master‘s thesis deals with using surface texture parameters for conformity assessment and process control. The aim of the thesis was to create an overview of surface texture parameters, an overview of procedures for conformity assessment and process control using surface texture parameters, practical application on an industrial product and practical recommendations. The thesis includes an overview of profile and areal surface texture parameters, including an original translation of terms of the areal method. Methods of conformity assessment and process control in connection with the surface texture parameters are also described. Statistical analysis was performed based on 7200 values of surface parameters and 1843200 values of profile parameters which were measured on parts from serial production. The last chapter includes practical recommendations.
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Advanced methods of surface topography evaluation for finishing technology
Adamus, Petr ; Sliwková, Petra (referee) ; Píška, Miroslav (advisor)
The main theme of this thesis is the surface topography evaluation. The theoretical part introduces the fundamental methods of evaluation, measuring instruments and describes profile and surface topographic parameters. In the practical part, the influence of different cutting conditions in high-feed face milling was researched on sample made of aluminium alloy 7475-T7351. For the surface topography evaluation of all samples the measuring device Alicona IF G5 was used. The last part of the diploma thesis is devoted to the economic influence of cutting conditions on the process of high-feed face milling.
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Surface roughness measurement of shaft parts of gearbox MQ100 using scattered light method
Horák, Josef ; Slaný, Martin (referee) ; Kalivoda, Milan (advisor)
This thesis primary deals with the possible use of measuring the surface texture of gearbox MQ100 shaft parts in serial production by the scattered light method. The introduction briefly describes the company ŠKODA AUTO a.s., as well as gearbox MQ100. The paper continues by describing the process of manufacturing shaft parts, focusing on grinding, no. 130 for pinions and no. 135 for drive shafts, which is the last process of manufacturing shaft surfaces. The next part of the thesis describes the quality of ground surfaces in gearbox MQ100 shaft parts for the control period, followed by the dependency evaluation of parameter Aq, concerning the surface-structure optical measurement, on parameter Rz. After the dependency has been determined, the thesis delineates verification tests, and proposes a tolerance value for parameter Aq when taking the measurements by the diffused light method. In addition, a modification of the OptoSurf measuring device is suggested as well as the proposal of issuing a test certificate in order to determine the final tolerance value of parameter Aq.
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Quality assessment of a thermostat valve
Kropáč, Ondřej ; Harčarík, Matej (referee) ; Jankových, Róbert (advisor)
The automotive thermostat currently contributes significantly to the potential to reduce the output of the exhaust gases. The heart of the modern thermostat is the ball valve assembly which also deals with this master‘s thesis. First of all the principles of the quality of the automotive thermostat are described with the choice of further deeper examined properties. The manufacturing process of a ball element and PTFE sealing ring is described. Subsequently the problem of increased production of nonconforming products in production is studied focusing on the surface texture of teflon ring and shape analysis of the ball element. Finally a recommendation for practice with regard to the reduction of additional costs associated with poorly manufactured part is created and further action on this issue is recommended.
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Evaluation of the influence of machining technologies on the analysis of the surface texture of technical plastics
Škeřík, Filip ; Dobrocký, David (referee) ; Sedlák, Josef (advisor)
The diploma thesis deals with the influence of machining technologies (turning, milling, grinding and polishing) on the surface texture of functional surfaces of selected materials from technical plastics. In the first part of the thesis there is a theoretical analysis of the possibilities of machining plastic materials. Furthermore, an analysis of the most commonly used parameters for evaluating the roughness of the machined surface and their effect on functionality is performed. The experimental part of the thesis describes samples preparation, analysis of measured data and subsequent evaluation with benefits for machinery industry.
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Use of a coordiante measuring machine for surface quality evaluation
Vančurová, Martina ; Šrámek, Jan (referee) ; Harčarík, Matej (advisor)
This master’s thesis deals with the use of a coordinate measuring machine probe for surface texture evaluation. The thesis’ goals were to describe the Renishaw’s SFP2 probe, to analyze the measurement system of the probe and a common stylus instrument, to carry out a demonstrative measurement, to analyze measurement results and to give practical recommendations. The measurement system analysis of the SFP2 consists in the evaluation of minimal specification limits of selected roughness parameters, for which gauge capability can be proven. The analysis results are compared with the results of the measurement system analysis of the Surtronic 25 profilometer. The differences in the measuring processes of mentioned devices are demonstrated by surface texture inspection of torque converter body. For the measurement result analysis, uncertainties in the selected surface texture parameters are calculated in two ways. Finally, recommendations for the producer of the probe and for its users are worked out. The results of this thesis may contribute to a wider use of a coordinate measuring machines for surface quality evaluation.
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Multiparametric diagnostics of high-speed machine
Bowyer, Matouš ; Harčarík, Matej (referee) ; Jankových, Róbert (advisor)
The goal of the thesis was applying multiparametric diagnostics to determine the state and wear of a high-speed milling machine. In the theoretical section, selected areas of multiparametric diagnostics have been described as well as a significant focus on vibrodiagnostics. The chosen methods for the practical section were incorporated into the group “metrological diagnostics”. Several different types of measurements have been performed on the designed test piece. The measurements were analyzed and lead to these specific results: a drawing of the test piece, a structured methodology for evaluating the test piece, recommendations for diagnostics of the specific machine, and proposals for the future development of the field of metrological diagnostics.
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