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Analysis of wear on cutting edges during turning of main steels
Balíček, Martin ; Sedlák, Josef (referee) ; Jaroš, Aleš (advisor)
This diploma thesis deals with the choice of suitable VBD for longitudinal turning barrel steel OCHN3MFA. In the theoretical part, serving as a basis for the experimental part, the technology of turning, tooling and coating methods was analyzed. In the experimental part, ten VBDs were tested, eight of which were of cemented carbide and two of ceramic. The monitored parameters were force load and tool wear VB. From the evaluated load data and tool wear, a suitable VBD for turning barrel steel was selected. The most suitable VBD for turning barrel steel is VBD – G. Tools VBD – I and VBD – J from ceramics are inappropriate tools for turning barrel steel.
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Influence of coatings on durability of cutting inserts during longitudinal turning
Balíček, Martin ; Sámelová, Vendula (referee) ; Jaroš, Aleš (advisor)
This thesis deals with the influence of deposited coatings for durability and tool wear during longitudinal turning of steel CSN 41 1600 (E335) and influence of wear and surface quality. The theoretical part is focused on characteristics of turning technology, application, manufacturing and methods of coating cemented carbide and tool wear. The experimental part of the thesis includes the evaluation of the measured values, a description of the material, used tools and machine tool. The values measured in the experiment imply that the most suitable of the tested tool inserts is WNMG 3-1-NF with applied coating TiAlN + TiN. Surface quality decreases with increasing wear of the tool.
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The influence of PVD coating on tool life of cutting inserts during face milling
Jašek, Petr ; Fiala, Zdeněk (referee) ; Jaroš, Aleš (advisor)
This diploma thesis is aimed on durability of PVD and CVD coatings for symmetrical face milling. The theoretical part describes the characteristics of cemented carbides, milling technology and the characteristics of the coating methods. The experimental part describes the machine tool, used tools, workpiece material and cutting conditions. The aim of the work was to measure the cutting forces and tool wear during the milling. Based on experiment, it is clear that the PVD coatings with nano-layers achieves to the longer life in comparison with others and generally, that the using of coatings leads to reduction of cutting powers and lifetime was increased.
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Data selection and optimisation of cutting conditions for progressive production technologies
Baklík, Lukáš ; Sliwková, Petra (referee) ; Píška, Miroslav (advisor)
This thesis discusses a change of an existing surface grinding technology for a more effective technology of face milling for the finishing operation of the jaw (for a hydraulic machine vise) in a tempered state with hardness of 53+4 HRC. The jaw is made of tool steel according to the Czech standard CSN41 9312. Two new versions are proposed for the new technology. Progressive cutting materials are listed for milling. A suitable tool is selected. Total production costs and machine times for cutting conditions of the chosen tool are predicted. In the experimental part, the cutting conditions are verified in practice.
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Application of PVD coatings for face milling
Jaroš, Aleš ; Humár, Anton (referee) ; Píška, Miroslav (advisor)
Diploma thesis is focused on the application of PVD coatings for face milling. The theoretical part, systematically, deals with the division of coating methods. PVD method is stressed here. Treatment of material before coating is described as well. The machine, the machine tool and cutting material is described in the experimental section. The aim of the work was comparison of coating exchangeable cutting tips (VBD) to uncoated ones. Based on experiment, it is clear that the use of PVD coatings resulted in reduction of cutting powers and lifetime was increased.
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A new Variant of Production Components "Sole Plate"
Briš, Tomáš ; Osička, Karel (referee) ; Kalivoda, Milan (advisor)
The bachelor thesis aims at forming a new variant of production components „sole plate“ which has a character of a flat block with stepped protrusions. The main points of the work will be component analysis, description of the conditions under which the solution was carried out, description of the current technology, proposal of a new technology as well as their final comparison and the results assessment. The work is focused on forming a more effective manufacturing process which would replace the current one.
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Influence of cutting conditions on durability of cutting inserts during turning
Hynčica, Vojtěch ; Fiala, Zdeněk (referee) ; Jaroš, Aleš (advisor)
The aim of present thesis is to determine the influence of the cutting conditions (the cutting speed, the feed, the depth of cut) on wear and durability of cutting inserts during machining process of the Inconel 718 alloy. In theoretical part thesis describes technology of turning, cemented carbides, their production and coating; it also deal with how the wear of the tool arises and how the tool wear progresses. In experimental part of this thesis we describe the cutting material, the machine, the machine tool and the experiment procedures. Measured values showed, that the durability of cutting inserts decreases depending on the cutting speed. We have determined that there is no direct correlation between the tool wear and the (increasing) level of the feed and the depth cut.
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Multi functional milling cutter and CNC machines with rating.
Leden, Pavel ; Zemčík, Oskar (referee) ; Kalivoda, Milan (advisor)
This thesis is focused on milling cutters for CNC machines which create integral branch of modern machining method. Thesis is divided into individual sections from choose of method and tool to choose of principles of work holding. The attention is mainly focused on assortment of milling tools. At the close of this thesis there are mentioned some practical examples from the manufacturing process in selected engineering firms.
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