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The Influence of Heat Treatment on the Structure and Mechanical Properties of Tool Steels
Tobolík, Stanislav ; Němec, Karel (referee) ; Molliková, Eva (advisor)
This bachelor thesis deals with the properties of tool steels after heat treatment. The theoretical part describes the properties of iron and its alloys with carbon, and an overview of the use of steel. It is also discussed in detail the heat treatment of tool steels and manufacturing process analysis and metallographic sample. In the last part of the bachelor thesis there are described the mechanical testing of metals. In the practical part it is tested structure and mechanical properties of the selected tool steels for two types of heat treatment and the results are compared with the requirements imposed on it.
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Surface treatment of selected steels using electron beam
Oríšek, Petr ; Jan, Vít (referee) ; Kouřil, Miloslav (advisor)
The thesis aims for the surface treatment of materials using electron beam. It includes a literary research describing physical principle and properties of the electron beam. This research also presents possible influencing of the beam and describes the construction of the device that generates the beam. Various applications of the electron beam for the material treatment are presented in the second part of the paper. Within this thesis an experiment with the heat treatment of the steel surface by the electron beam has been realized. The experiment was aimed at creating a layer as deep as possible without melting the surface. The results and their evaluation are presented in the experimental part of the thesis. The attention is also paid to selected process parameters.
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Tool steels
Bíza, Michal ; Němec, Karel (referee) ; Molliková, Eva (advisor)
The bachelor thesis deals with the types of steel that are used to produce working tools. There is a classification and the characterization of the most frequently used tool materials in the first part. The second part describes the classification of tool steel according to various criteria, a tool steel production, heat treatment, the structure and the properties of steel used for tools. The last part is focused on the description of the types of tool steel that are classified according to their use in practice.
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Renovation of casting molds by laser cladding technology
Cicha, Tereza ; Kubíček, Jaroslav (referee) ; Mrňa, Libor (advisor)
The diploma thesis deals with study of laser cladding technology and possibilities of its use in renovation of casting molds made of hot-work tool steel. The theoretical part describes methods of laser cladding, testing methods and characteristics of the base material and its heat treatment. In the experimental part the test clads, and the metallographic samples were made. The samples were evaluated in terms of macrostructure and microstructure, especially clad geometry, dilution, and defects like pores and cracks. Microhardness was also measured. In conclusion a technical and economic evaluation was performed.
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Workability study 3D metal printing as technology for prototype plastic parts manufacturing
Kovář, Tomáš ; Herčík, Tomáš (referee) ; Sigmund, Marian (advisor)
This bachelor thesis is focused on the feasibility of metallic 3D printing. The 90MnCrV8 tool steel die is time consuming and expensive to manufacture by conventional methods. When considering the use of a die for a maximum of 50 pieces of moldings, it is possible to choose a material other than tool steel. From the offered possibilities of metal 3D printing, 2 suitable methods were selected, namely SLM and WAAM, where the WAAM method appears to be cheaper. Available materials for steel replacement 90MnCrV8 are metal wire G4Si1 for WAAM method and stainless steel X2CrNiMo17-12-2 for the SLM method. After listing all the options and evaluations, it can be seen that the feasibility of metallic 3D printing as a replacement for conventional tool production is possible.
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Assessment of suitability welding modes MIG PULSE and MIG DOUBLE PULSE for repairing of forging die
Sotolář, Vojtěch ; Kubíček, Jaroslav (referee) ; Izák, Josef (advisor)
The bachelor thesis is focused on the renovation of forging dies by pulse methods, specifically MIG pulse and MIG double pulse. The subject of this research was a part of forging die made of steel Wr.Nr 1.2343ESU (H11), however the problem was simplified to the welding of four prisms with the same type of material. The main goal was to evaluate whether these methods can be utilized to speed up the entire renovation process as the welding speed is its undeniable advantage. There were used two types of welding materials to assess the suitability of the renovation. For the tough weld was used the martensitic material CRONITEX RC 58 and for the interlayer was used austenitic-feritic material WELCO A1660. The assessment was conducted based on the non-destructive visual test and also based on destructive tests of macrostructure, microstructure and hardness measurement. The experiment results showed that configuration of tough material with interlayer is inappropriate. The most suitable process seems to be the welding of only tough layer without any interlayer.
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Workability study 3D metal printing as technology for prototype plastic parts manufacturing
Kovář, Tomáš ; Herčík, Tomáš (referee) ; Sigmund, Marian (advisor)
This bachelor thesis is focused on the feasibility of metallic 3D printing. The 90MnCrV8 tool steel die is time consuming and expensive to manufacture by conventional methods. When considering the use of a die for a maximum of 50 pieces of moldings, it is possible to choose a material other than tool steel. From the offered possibilities of metal 3D printing, 2 suitable methods were selected, namely SLM and WAAM, where the WAAM method appears to be cheaper. Available materials for steel replacement 90MnCrV8 are metal wire G4Si1 for WAAM method and stainless steel X2CrNiMo17-12-2 for the SLM method. After listing all the options and evaluations, it can be seen that the feasibility of metallic 3D printing as a replacement for conventional tool production is possible.
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Examination of degradation frequently repaired shearing and forming tools
Izák, Josef ; Kubíček, Jaroslav (referee) ; Sigmund, Marian (advisor)
The diploma thesis is focused on the renovation of forming tools made of tool steel, their weldability and assessment of the quality of tool repairs. The damaged tool was a part of the cutter from the progressive cutting tool made of Caldie steel. We used micro TIG technology to repair the damage. A total of three types of additional materials were used and investigated to restore the geometry of the damaged edge. One of the main purposes was to evaluate the possibility of extending the life of tools and reducing the implementation of already inefficient repairs. A number of destructive tests were performed for the assessment - macrostructure, microstructure, hardness measurement and EDS analysis.
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Renovation of casting molds by laser cladding technology
Cicha, Tereza ; Kubíček, Jaroslav (referee) ; Mrňa, Libor (advisor)
The diploma thesis deals with study of laser cladding technology and possibilities of its use in renovation of casting molds made of hot-work tool steel. The theoretical part describes methods of laser cladding, testing methods and characteristics of the base material and its heat treatment. In the experimental part the test clads, and the metallographic samples were made. The samples were evaluated in terms of macrostructure and microstructure, especially clad geometry, dilution, and defects like pores and cracks. Microhardness was also measured. In conclusion a technical and economic evaluation was performed.
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Cutlery steels and their composition and properties
Lenghardová, Monika ; Kaňa, Václav (referee) ; Záděra, Antonín (advisor)
This paper is focused on the description of steels suitable for blades production in terms of their chemical composition, structure, properties and thermal processing. The practical part is focused on the assessment of particular selected tool steels manufactured by conventional procedures - AK5, N690 and RWL34 steel manufactured by powder metallurgy. There were carried out the two methods of thermal processing with all three selected steels and the subsequent assessment was performed on the basis of the results of mechanical properties testing - three-point bend and hardness according to Rockwell, including the metallographic assessment of material structure.
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