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Rationalization of production to improve roughness of a selected surface of rectilinear hydraulic motors
Urban, Jan ; Píška, Miroslav (referee) ; Sliwková, Petra (advisor)
In this paper, the influence of cutting parameters, machining strategies and material properties on the resulting surface roughness of a selected surface of a groove for a seal on the cover of a straight-line hydraulic motor are investigated. Based on the analysis of the results of the initial experiments of the existing production, specific measures are proposed to rationalize the manufacturing process. The effectiveness of the proposed measures is verified by further experiments carried out on real workpieces under industrial production conditions under the same manufacturing conditions. Subsequently, the results of the methods are compared with each other. The inclusion of a time delay between radial and axial feed during the finishing operation of the grooving had a very positive effect on the surface quality. The surface roughness values not only came within the prescribed tolerance but well below it. The economic evaluation shows that the rationalised production process does not have a noticeable effect on the overall cost of production and hence the results of this thesis are recommended for implementation in practice.
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Evaluation of Surface Quality When Using AWJ And WJM Cutting Methods
Pecháček, Martin ; Dvořák, Jaromír (referee) ; Slaný, Martin (advisor)
This study deals with technology of abrasive water jet material cutting and influence of cutting head feed rate on surface topography of cut walls with regards to roughness. Eight parameters were chosen based on the CSN EN ISO 4288 standard representing quality of surface after AWJ cutting. When AWJ cutting the chosen material – commercially pure ASTM B265 grade 2 titanium – feed rate was being changed and in order to obtain information about each parameter´s distribution in various depths of the cut, surface composition was evaluated. It was found out that feed rate has significant influence on surface and that the profile elements´ width grows when increasing the feed rate and cut depth. Furthermore, two selected feed rate results were compared to laser beam technology and conclusion for the selected material was made that AWJ cutting is more preferable due to final roughness and no heat affect on the material.
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Measurement of roughness of the laser cutting edge
Drábek, Michal ; Šknouřilová, Eva (referee) ; Mrňa, Libor (advisor)
This bachelor thesis deals with laser cutting technology. The thesis is divided into theoretical and practical part. In the theoretical part is described the basic principle and function of the laser and the distribution of different types of lasers. Descriptions of each use of lasers in the engineering industry follow, more attention is mainly devoted to laser cutting. In the experimental part is presented a methodology to measure the roughness of the test samples which were cut from stainless steel X5CrNi18-10, the subsequent evaluation of the roughness parameters and comparison with the norm ČSN EN ISO 9013.
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Evaluation of Surface Quality When Using AWJ And WJM Cutting Methods
Pecháček, Martin ; Dvořák, Jaromír (referee) ; Slaný, Martin (advisor)
This study deals with technology of abrasive water jet material cutting and influence of cutting head feed rate on surface topography of cut walls with regards to roughness. Eight parameters were chosen based on the CSN EN ISO 4288 standard representing quality of surface after AWJ cutting. When AWJ cutting the chosen material – commercially pure ASTM B265 grade 2 titanium – feed rate was being changed and in order to obtain information about each parameter´s distribution in various depths of the cut, surface composition was evaluated. It was found out that feed rate has significant influence on surface and that the profile elements´ width grows when increasing the feed rate and cut depth. Furthermore, two selected feed rate results were compared to laser beam technology and conclusion for the selected material was made that AWJ cutting is more preferable due to final roughness and no heat affect on the material.
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Measurement of roughness of the laser cutting edge
Drábek, Michal ; Šknouřilová, Eva (referee) ; Mrňa, Libor (advisor)
This bachelor thesis deals with laser cutting technology. The thesis is divided into theoretical and practical part. In the theoretical part is described the basic principle and function of the laser and the distribution of different types of lasers. Descriptions of each use of lasers in the engineering industry follow, more attention is mainly devoted to laser cutting. In the experimental part is presented a methodology to measure the roughness of the test samples which were cut from stainless steel X5CrNi18-10, the subsequent evaluation of the roughness parameters and comparison with the norm ČSN EN ISO 9013.
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Surface roughness measurement
KEHLER, Roman
This thesis deals with surface roughness measurement of polyethylene plates before and after plasma discharge application by Hommel-Tester T2000 contact measurement device. The first section describes basic terms, units and definitions, types of devices and tools used for surface roughness measurement. The next section of thesis is focused on practical measurement of given samples and their surfaces structure evaluation.
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