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High speed steel milling cutters made by powder matallurgy
Svoboda, Martin ; Sámelová, Vendula (referee) ; Jaroš, Aleš (advisor)
Bachelor thesis is a research work describing milling cutters made of high speed steel by powder metallurgy (HSS PM milling cutters). In chapters one, two and three are generally described milling, high speed steels and powder metallurgy. In chapter four are introduced particular HSS PM milling cutters of a few producers. The summary contains mechanical properties of cutters and suitability for machining. It is focused on main type of HSS PM cutters, which are the end mills.
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HSS milling cutters deposited by nanocomposite coatings
Ludvík, Radek ; Kolář, Ladislav (referee) ; Jaroš, Aleš (advisor)
This bachelor thesis deals with nanocomposite coatings deposited on cutting tools of high speed steel. The paper describes the fundamentals of milling, tools for milling and their division and clamping. Gradually, there are analyzed problems of high speed steels (their classification, marking, properties and uses, chemical composition and heat treatment). Then there is described the main characteristics of coating methods (division of coatings into generations, surface preparation before the coating and PVD and CVD methods). The last part of the thesis focuses on the properties of nanocomposite materials and to companies dealing with their application to the high-speed steel.
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Production of gears by hobbing
Ivánek, Radim ; Kalivoda, Milan (referee) ; Jaroš, Aleš (advisor)
The aim of this study is to compare the manufacturing costs and times of a gear hobbing process. The theoretical part of the thesis is aimed to describe the gears hobbing manufacturing process, their characteristics and this way used processing materials. The practical part of the thesis is comparing the manufacturing gear hobbing costs and machining times using high-speed steel tools to sintered carbides tools in line manufacturing. This study evaluates and rationalizes all the found and calculated data.
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Production forming drills and theier use in practice
Narovec, David ; Osička, Karel (referee) ; Dvořák, Milan (advisor)
The bachelor thesis deals with forming drills, their production and practical use. The forming technology with focus on the heating of the material for forming is described in the first part of the paper. The second part is focused on general drilling. The drilling technology, drilling process and various drill production techniques are covered. The twist drill is described as well and its basic parameters are mentioned. Twist forming drills are examined in the last part of the paper. Material choosing, technological drill forming process, final drill shape testing for its fading and practical utilization. In conclusion a practical study of cleft drill was performed.
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Milling of axial groove in rotary turbine
Káčer, Pavel ; Prokop, Jaroslav (referee) ; Osička, Karel (advisor)
The aim of this work is comparison of special form tools for manufacture of grooves in rotor turbine. For this purpose tools are chosen from „A“ and „B“ company. Form milling cutters are confronted both in terms of their characteristic features, manufacturing methods, and time and economy intensity. Furthermore, there is described a possible future way of grooves‘ production through the use of the „C“ ‘s programme. Apart from that, this thesis also involves simple programme for comparing the chosen parameters.
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Analysis of cutting tests on the performance of axial tools
Fasora, Jan ; Nečesánek, Emil (referee) ; Sedlák, Josef (advisor)
This master thesis deals with a cutting test on performance of an innovative high-speed steel twist drill. The theoretical part of the thesis is focused on the analysis of individual influences on the drilling process, the emphasis is placed on the influence of tool geometry. The main experimental part of the thesis deals with the influence of twist drill geometry on the cutting performance, specifically influence of the point angle and lip angle on the drilling process. The workpiece material is austenitic stainless steel. The results achieved in a completed experiment are used in a cutting tool development. The achieved results show that a layer of material with higher hardness situated on workpiece can increase a drill holes quality up to twice. To achieve a stable drilling process it is needed to obtain the values of the point angle and lip angle depending on the each other. In general, the recommended application range of these angles while drilling austenitic stainless steel can be 138° to 142° in the case of the point angle and 7° to 10° for lip angle.
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On the analysis of thin-wall parts sawing
Spáčil, Radek ; Dvořáková, Jana (referee) ; Píška, Miroslav (advisor)
Master‘s thesis deals with sawing of the thin-walled parts with high speed steel slitting saw. At first the most used conventional and unconventional possibilities of materiál cutting are described by a form of search. The next chapter describes forces arising from splitting saw machining, including their dependence on a specific cutting force, a chip cross section and a engagement angle. The second part of the thesis deals with the technological improvement of the cutting process, where three possible solutions are considered – geometry of the cutting tool, PVD coating deposition of the cutting tool and process fluid change. In the experimental part non coated slitting saw with burrs, non coated deburred slitting saw and coated slitting saws are compared. Used coatings were Ti(C,N), Cr-Al-Si-N, Al-Cr-B-N, and TripleCoating Cr, which is consisting of three layers TiN + (Al,Ti)N + Cr-Al-Si-N. The experiment has shown that the cutting forces inceases as the edge radius and wear level of the cutting tool increases. Coated cuttung tools has shown lower differences between the first and the last cut. Slitting saws have been also used in real cutting process to verify experimental results.
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Analysis of cutting tests on the performance of axial tools
Fasora, Jan ; Nečesánek, Emil (referee) ; Sedlák, Josef (advisor)
This master thesis deals with a cutting test on performance of an innovative high-speed steel twist drill. The theoretical part of the thesis is focused on the analysis of individual influences on the drilling process, the emphasis is placed on the influence of tool geometry. The main experimental part of the thesis deals with the influence of twist drill geometry on the cutting performance, specifically influence of the point angle and lip angle on the drilling process. The workpiece material is austenitic stainless steel. The results achieved in a completed experiment are used in a cutting tool development. The achieved results show that a layer of material with higher hardness situated on workpiece can increase a drill holes quality up to twice. To achieve a stable drilling process it is needed to obtain the values of the point angle and lip angle depending on the each other. In general, the recommended application range of these angles while drilling austenitic stainless steel can be 138° to 142° in the case of the point angle and 7° to 10° for lip angle.
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On the analysis of thin-wall parts sawing
Spáčil, Radek ; Dvořáková, Jana (referee) ; Píška, Miroslav (advisor)
Master‘s thesis deals with sawing of the thin-walled parts with high speed steel slitting saw. At first the most used conventional and unconventional possibilities of materiál cutting are described by a form of search. The next chapter describes forces arising from splitting saw machining, including their dependence on a specific cutting force, a chip cross section and a engagement angle. The second part of the thesis deals with the technological improvement of the cutting process, where three possible solutions are considered – geometry of the cutting tool, PVD coating deposition of the cutting tool and process fluid change. In the experimental part non coated slitting saw with burrs, non coated deburred slitting saw and coated slitting saws are compared. Used coatings were Ti(C,N), Cr-Al-Si-N, Al-Cr-B-N, and TripleCoating Cr, which is consisting of three layers TiN + (Al,Ti)N + Cr-Al-Si-N. The experiment has shown that the cutting forces inceases as the edge radius and wear level of the cutting tool increases. Coated cuttung tools has shown lower differences between the first and the last cut. Slitting saws have been also used in real cutting process to verify experimental results.
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Production of gears by hobbing
Ivánek, Radim ; Kalivoda, Milan (referee) ; Jaroš, Aleš (advisor)
The aim of this study is to compare the manufacturing costs and times of a gear hobbing process. The theoretical part of the thesis is aimed to describe the gears hobbing manufacturing process, their characteristics and this way used processing materials. The practical part of the thesis is comparing the manufacturing gear hobbing costs and machining times using high-speed steel tools to sintered carbides tools in line manufacturing. This study evaluates and rationalizes all the found and calculated data.
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