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Rationalisation of chip management
Mrkvica, Jan ; Kalivoda, Milan (referee) ; Osička, Karel (advisor)
The diploma thesis deals with the rationalization of chip management in a selected manufacturing company. The first part of the thesis analyses the current state of the chip management in the company, which is divided into conventional and non-conventional machining. Then a theoretical analysis is carried out, which focuses on chips, in terms of their origin, types and then an analysis of cutting media. The next theoretical section discusses EDM. In the last theoretical part, an analysis of the possibilities for processing chips is made. In the practical part, three options for rationalisation of chip management are discussed, and the suitability of each of them for the selected enterprise is assessed. The most advantageous of them is then elaborated into an implementation form and a technical – economic evaluation is carried out in which the suitability of the solutions used is assessed. Attention is also paid to the rationalisation of EDM.
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Possibilities of limiting unwanted phenomena during chip finishing machining
Handl, Jiří ; Osička, Karel (referee) ; Kalivoda, Milan (advisor)
The diploma thesis focuses on the possibilities of limiting undesirable phenomena during finishing chip machining. In the theoretical part, selected negative phenomena arising during turning are described and the possibilities of their limitation are investigated. In the experimental part, an analysis of the influence of cutting conditions from the recommended range of the cutting tool using the turning method is carried out. Specifically, the dependence of the cutting speed and feed rate on the size of the cutting force, temperature and resulting surface quality for two different materials is monitored. The obtained results serve to understand the issue and optimize the production process.
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Design of sheet metal cutting technology by wire electrical discharge
Chládek, Vilém ; Osička, Karel (referee) ; Kalivoda, Milan (advisor)
This diploma thesis deals with electrical discharge machining with a greater emphasis on wire EDM, which the experiment is carried out. The theoretical part discusses the general principle of EDM and types of this method of machining. The experiment consists of machining a high and a low piece with a wire electrode and is then followed by a comparison of observed values such as machining time, power consumption, dimensional deviations etc. The high piece here represents cutting multiple sheets stacked on top of each other. The experiment is therefore intended to demonstrate how much more advantageous it is to machine multiple sheets at the same time. In addition, machining of the low piece is performed on an older machine for comparison with a new machine. The course of the experiment is described in detail from the characteristics of the used machines to the evaluation of the results.
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Laser cutting of light and non-ferrous metals
Krucina, Mikuláš ; Kalivoda, Milan (referee) ; Osička, Karel (advisor)
The problem dealt with in this thesis is laser cutting of light and non-ferrous metals. The thesis is divided into research and experimental parts. The research part focused on the analysis of the physical principle of laser cutting, technological possibilities of laser cutting and limitations for individual materials. The experimental part was focused on monitoring the effect of cutting speed, gas pressure and machine power on the surface roughness and dimensional accuracy of the fabricated samples. Two materials were chosen for the experiment. For all samples, a DURMA HD-F 3015BH fibre laser was used for cutting. In the first part of the experiment the influence of selected laser cutting parameters was investigated for samples made of EN AW 5754 material with a thickness of 3 mm. In the second part of the experiment, Cu-ETP material with a thickness of 1 mm was used and the influence of the selected laser cutting parameters was also observed in this case. The last part of this thesis deals with the evaluation of the cutting process from an economical point of view, where the price per meter of cutting and the hourly laser rate for the material were calculated.
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Tool design for production of springs for an organ
Svoboda, Jakub ; Osička, Karel (referee) ; Kalivoda, Milan (advisor)
This thesis focuses on a design for a machined bending fixture to enable the production of valve springs for organs. The reason for choosing this topic was the need to perfect the existing process of making organ springs. The main problem with the original fixture was the poor quality of the spring thread. Valve springs have varying properties and parameters that determine the requirements for the fixture. A 3D model of the complete fixture was created based on the author’s ideas and these requirements. Calculations were then made for a spring of specific dimensions. These calculations showed that the proposed size of the crank is adequate to enable it to be turned by the human hand. A force of 28 N is required at the end of the crank arm to exert the bending torque required to properly thread the spring. This figure is lower than the tabular values for the general European working population. This implies that the crank arm has the designed proportional length. To calculate the same specific spring and verify the function of the fixture, software simulation was also used. When creating the model, in addition to the calculations and simulation, an experiment was also conducted to verify the function and the main idea of the fixture, which is to bend with additional tensile stress. The result of the experiment was a spring that was subsequently compared with a spring produced using the original fixture. The marked difference in the appearance of the thread proved that the author’s idea was correct. The entire fixture and its components are described in detail in the thesis. The comprehensive design of the fixture in the form of a 3D model is prepared for consultation in an organ-making workshop and then for use in production.
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Use of water jet technology in a company
Faltus, Tomáš ; Osička, Karel (referee) ; Kalivoda, Milan (advisor)
This thesis focuses on water jet technology. In the theoretical part of the thesis, the principle and classification of this technology, the quality of the cut surfaces after water jet cutting, the types of bevels, and the equipment needed for this technology are described and analyzed. It also describes the use of an abrasive water jet in machining and summarizes the advantages and disadvantages of this technology. Additionally, the thesis presents the machinery of the company with which the author of the diploma thesis worked, as well as its production range. The practical part of the work is devoted to the experiment, which consists in selecting a component for the production of samples using two abrasive nozzles, with subsequent assessment of the quality of the machined surfaces in relation to the size of the diameter of the abrasive nozzles as well as in relation to the materials and their thickness. Two materials of two different thicknesses were used for the samples. The quality of the machined surfaces was measured using two roughness meters. The average arithmetic deviation of the profile Ra and the largest height of the profile Rz were measured. At the end of the thesis, the deflection of the beam is measured using a microscope, and the consumption and the price of the abrasive for individual sample components were also calculated.
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Machining of the gear-box casting on a CNC machine
Hložek, Milan ; Osička, Karel (referee) ; Kalivoda, Milan (advisor)
The master’s thesis focuses on the machining of a chosen gearbox on a CNC machine. The theoretical part deals with gearboxes in general and the aluminium alloy from which a selected gearbox is manufactured. In the practical part, the machining of the gearbox is proposed according to the corresponding drawing. Gradually suitable machines are selected, then depending on their limits, clamping devices are designed, next a set of tools is selected and an NC program is generated. The technological process of production is proposed and the basic production costs are calculated.
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Finishing tool manufacturing
Rušín, Filip ; Kouřil, Karel (referee) ; Kalivoda, Milan (advisor)
This bachelor thesis deals with the production of a finishing instrument for roughing three different diameters. The first chapter introduces the selection of the required material, the semi-finished product design and the heat treatment of the product. The following is determination of the production conditions and compilation of the technological process and drawing. At the end of this work there is an evaluation of the technical-economic aspect and a discussion about possible upcoming situations.
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Cutting of supporting profiles on building
Protivínský, Pavel ; Osička, Karel (referee) ; Kalivoda, Milan (advisor)
The bachelor thesis deals with technology for material cutting on the building site. Firstly, there were described different methods for material cutting, their principle, reached quality of section, demands for requirements on Occupational safety and health (OSH) and there are described different qualification of device operators. Secondly there were described specific condition in a mobile building site. Eventually, there are compared all the examined technologies after the experiment according to different criteria.
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Machining of aluminum alloy component
Lačňák, Martin ; Kalivoda, Milan (referee) ; Osička, Karel (advisor)
The thesis focuses on the technology of production of the turbine-type component in Edwards company. It specifically focuses on the part of the turning production, in which in the first part an analysis of the component and the technologicity of its construction is created. Problematic aspects are analysed in terms of material structure and procedure technology. An evaluation of the former and the new supplier is made in terms of rationalization of material structure and their statistical evaluation of rationalization improvement towards keeping to geometrical tolerances. Grooving tools greatly influence the overall machining time during turning. An experiment is made to find out the measured values of the radial forces, the process of chip formation and surface roughness during grooving. The technology of procedure further deals with rationalization of the current machine OKUMA LU25-M and purchase of a new machine Mori Seiki NTX 2000, for which new tool equipment is made in cooperation with Walter company. The final technical-economical evaluation sums up all findings from the research of the given issue. In the discussion, further continuation is suggested for the research in the development and for the continuously controlled component productivity.
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