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Temperature Profile in Reflow Soldering and Influence of Different PCBś and ComponentsThermal Capacities
Procházka, Martin ; Špinka, Jiří (referee) ; Starý, Jiří (advisor)
This thesis mainly deals with the prediction of temperature on the components and the PCB during reflow soldering. The theoretical part describes the particular solder reflow process, types of heat transfer and temperature profiles. The practical part is divided into forecasting temperatures if the conveyor is stopped and the temperature predictions when the conveyor is in motion. In both parts of the measured temperature is compared with the predicted temperatures, which show the success rate of prediction. The last part of this work is part of the simulation, which helps in proper understanding of the issues discussed.
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Scintillation Detector of Secondary Electrons for ESEM
Čudek, Pavel ; Špinka, Jiří (referee) ; Jirák, Josef (advisor)
The thesis deals with modifying and biulding of scintilation detector of secondary electrons for environmental scanning electron microscopy. It describes dilemma of environmental scanning electron microscopy, types of detectors and secondary electrons detection. The experimental part of this thesis focuses on the design and construction of new scintillation detector on the basis of simulations secondary electrons trajectories. Identifying the parameters, pressure dependencies and optimizations of electrode system of the detector realized.
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Test Equipment for Solder Joint Strength Measuring
Čechák, Ondřej ; Špinka, Jiří (referee) ; Starý, Jiří (advisor)
This master thesis introduces the problematics of the tensile strength of soldered joints and the correlative mathematical formulas and the use of mentioned problematics in the technology of die shear/pull machines designed for the solder joint tensile strength measurement. It explains the importance and reasons for the use of this technology. The emphasis is then laid on the design and construction innovations of the current laboratory manual shear/pull measuring machine, its semi-automation and the possibility of utilizing the innovated system in a laboratory class of a subject on FEEC BUT.
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Organic semiconductors properties
Kočer, Martin ; Vaněk, Jiří (referee) ; Špinka, Jiří (advisor)
This diploma thesis deals with optical properties of organic semiconductors and measuring method of absorption edge. Project is focused on absorption of light in organic semiconductors. This work also describes device for measuring of absorption edge.
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Monocrystalic silicon - optical properties
Kahánek, Tomáš ; Vaněk, Jiří (referee) ; Špinka, Jiří (advisor)
This diploma thesis deals with optical properties of silicon. The main task of the work was to create silicon samples with ohmic contacts. Suitable radiation source was designed to measure absorption edge of monocrystalline silicon. Designed measuring station was realised. Measurements were performed on samples of p-type monocrystalline silicon provided by ON Semiconductor Rožnov. p. Radhoštěm. The absorbtion edge was measured.
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Production logistics
Olej, Tomáš ; Vaněk, Jiří (referee) ; Špinka, Jiří (advisor)
This master’s thesis deals with manufacturing and logistic issues of low voltage cabinets produced by ProCS, s.r.o. company. The aim is to design and evaluate manufacturing and assembling process rationalization proposal. The proposal is based on familiarization with technological process of cabinet's manufacturing. Becoming familiar with manufacturing and assembling process of marshalling and system cabinets made it possible to find an opportunity of rationalization through automation of selected assembling processes. Automation of striping and crimping process is possible through suitable crimping machine. Situation before and after rationalization is economically interpreted and evaluated using break even point analysis. Through mentioned rationalization arrangement it is possible to improve manufacturing flexibility, reduce lead times and cut down manufacturing costs.
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Logistics and supply of PCB for repair of notebooks
Grob, Filip ; Starý, Jiří (referee) ; Špinka, Jiří (advisor)
This diploma thesis deals with issues of inventory management and logistics controlling. These segments are one of most important instruments used in logistics. Theory of these logistic instrumens are used as a base for practical part of this diploma thesis, where is described and suggested methodology for inventory management of printed circuit board in repair center. This buffer inventory serves for securing performance of customer’s supplies in case of failure on repair line. Thereinafter is realized program in MS Excel interface for supplying leadership with main insistence to prevent order delay.
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