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Testing of cutting parameters for UMCo50 machining
Jakubec, Thomas ; Kolomý, Štěpán (referee) ; Zemčík, Oskar (advisor)
The diploma thesis deals with the machinability of materials, the theoretical part describes the factors that have a dominant influence on machinability. The basic aspects according to which the machinability of the material and the wear of the tool are determined are also given here. The distribution of cobalt alloys is given here, including the UMCo-50 alloy, which is the subject of experimental research. It is an alloy for high-temperature use with good abrasion resistance and is used especially where other materials lose their mechanical properties due to the high temperature. The practical part followed the thesis of my colleague Ing. Peter Prno [1], which due to lack of time could not measure all the necessary quantities, resp. course of back wear for the remaining two cutting speeds. During the experiment, the wear of the tool back was monitored as a function of time at different cutting speeds in turning technology. The main goal was to determine the resulting tool life at the remaining cutting speeds and thus obtain a more accurate Taylor dependence. The turning forces, the quality of the machined surface and the formation of chips were also monitored during turning.
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Roughing milling of plane and form surface with CNC machines.
Indra, Jaroslav ; Zouhar, Jan (referee) ; Kalivoda, Milan (advisor)
The bachelor thesis deals with roughing milling. Beginning of this thesis is concerned with common description milling and example work surface. Next part refers about necessary information for selection of roughing milling tool and its toolholder. Next chapter deals with basic information about CNC milling machines. Last part is devoted selection of concrete configuration machine, tool and its toolholder for roughing milling of plane and form surface with CNC machines.
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Analysis of durability and costs of monolithic milling and drilling tools
Kašpar, David ; Osička, Karel (referee) ; Kalivoda, Milan (advisor)
This bachelor thesis deals with the durability of different types of monolithic drilling and milling tools made of high-speed steel and sintered carbide. The theoretical part deals with durability, possible types of wear of monolithic drilling and milling tools and related circumstances. The practical part examines the durability of different types of tools for drilling and milling, their comparison in terms of cost and productivity of machining and their impact on production costs in the production of a simple part.
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Modern methods in drilling.
Kodys, Martin ; Kalivoda, Milan (referee) ; Zemčík, Oskar (advisor)
This Bachelor’s thesis deals with modern methods in drilling. In the first part, the drilling methods are divided, followed by each method description and practical usage. The second part is devoted to the way of orientation in products of couple most significant producers of drilling tools.
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Coating methods for cutting tools
Novotný, Michal ; Dvořák, Jaromír (referee) ; Humár, Anton (advisor)
The bachelor thesis titled Coating methods for cutting tools describes techniques of deposition of hard abrasion resistant coatings by physical and chemical methods. The thesis contains the partition of the materials for cutting tools, description of producing cutting inserts made from sintered carbides, basic types of coating layers and comparison of coated sintered carbides in the assortment of selected manufacturers. There is also an outline of some trends in the area of coating methods at the end of the thesis.
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An effective cutting tool for shearing of spring wires
Smékal, Jan ; Sliwková, Petra (referee) ; Píška, Miroslav (advisor)
The goal of this master thesis was to propose modification of a cutting tool for shearing of spring wires with focus on improving its lifetime. An analysis of cutting process was made which confirmed low lifetime of lower cutting tool – average lifetime of cutting tool is 3 734 pieces. Suggestions were made in the thesis such as change of current technology, change of material of cutting tool or local change of cutting edge of the tool. Three changes were designed – insert from sintered carbide, hardfacing welding of the cutting edge and insert from high-speed steel. Testing of sintered carbide inserts ČSN ISO 513 HC – P80 and ČSN ISO 513 HC – P60 showed that sintered carbides are too brittle for cutting spring wires. Five hardfacing welding materials (HS6-5-2, HS2-9-2, X37CrMoW5-1, Stellite6 and Stellite12) have been tested. Material X37CrMoW5-1 had the best lifetime results with lifetime of 2 463 pieces. This material was further tested and average lifetime achieved was 2 021 pieces. However, there was decrease of hardness in a heat-affected zone. The last change of cutting edge was an insert from high-speed steels HS12-1-4 and HS10-4-3-10. These inserts were broken prematurely at the soldered joint and both high-speed steels exhibited cracks due to high material hardness (60 and 65 HRC), very low toughness at extremal loading.
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Testing of cutting parameters for UMCo50 machining
Jakubec, Thomas ; Kolomý, Štěpán (referee) ; Zemčík, Oskar (advisor)
The diploma thesis deals with the machinability of materials, the theoretical part describes the factors that have a dominant influence on machinability. The basic aspects according to which the machinability of the material and the wear of the tool are determined are also given here. The distribution of cobalt alloys is given here, including the UMCo-50 alloy, which is the subject of experimental research. It is an alloy for high-temperature use with good abrasion resistance and is used especially where other materials lose their mechanical properties due to the high temperature. The practical part followed the thesis of my colleague Ing. Peter Prno [1], which due to lack of time could not measure all the necessary quantities, resp. course of back wear for the remaining two cutting speeds. During the experiment, the wear of the tool back was monitored as a function of time at different cutting speeds in turning technology. The main goal was to determine the resulting tool life at the remaining cutting speeds and thus obtain a more accurate Taylor dependence. The turning forces, the quality of the machined surface and the formation of chips were also monitored during turning.
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