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Testing of Solders in Protection Atmosphere
Vala, Radek ; Jankovský, Jaroslav (referee) ; Szendiuch, Ivan (advisor)
The project deals with the overall design and construction of equipment called the desiccators for brazing in a protective atmosphere. The device was designed and manufactured cooling and heating element. For the soldering various temperature profiles have been defined and adjusted, as for SnPb as well for lead-free solders. There was a realization of samples were measured and analyzed. Finally were realized micro sections for lead free solder.
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REBALLING OF BGA PACKAGES USING PACE TF2700 EQUIPMENT
Roháček, Peter ; Špinka, Jiří (referee) ; Starý, Jiří (advisor)
The Diploma thesis is focused on reballing of BGA packages with the device PACE TF 2700. It describes the general types of BGA packages, their defects, importance of thermal management to the solder techniques, where it is also talked about the meaning of solders and fluxes for the joint. The work informs about the most common methods of reballing, the proper handling of components and the current situation with BGA stencils on the market. It briefly describes the device operation of PACE TF 2700, that is working on the convection and IR principle of heating components. It deals with the manufacturing of the template, dummy BGA packages, the test plates, creation of the thermo profile, comparing and examining the defects and their causes, which had the most significant impact on the results. The achievements would serve for comparing them with the results of the future laboratory exercises or as a subject for further works.
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Service life increasing of spare part tools for ground cultivation
Černín, Jiří ; Mrňa, Libor (referee) ; Sigmund, Marian (advisor)
This diploma thesis deals with increasing the service life of parts intended for soil cultivation. The work evaluates the current possibilities of increasing the utility value of spare parts. Practical tests will provide recommendations for the most appropriate method to increase durability. The work examines uncharted methods of testing soldered joint. The results are evaluated in terms of quality and economic profitability. All results from this work are based on the basis of practical tests of plowing machine in rocky soil.
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Analysis of Defects on PCB Using X-RAY
Mlýnek, Martin ; Vala, Radek (referee) ; Řihák, Pavel (advisor)
This thesis is focused on BGA packages and fault detection after rework using X – Ray. There is a description of BGA packages by carrier substrate, techniques of connecting on chip, from mounting packages to repair printed circuit boards (hereafter PCB). Thesis summarizes description of defects, which are created after rework process. There is also description of X – Ray as method for analyzing defects. X – PLANE method used to detect internal structure of BGA packages and it was confirmed by microsection and by software for reconstruction. Description of automatic and manual measurement is follow.
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Creation of workflows and soldering profiles on the HR600 station
Shakin, Pavel ; Skácel, Josef (referee) ; Otáhal, Alexandr (advisor)
This bachelor's thesis deals with the issues of mounting and reflow soldering of BGA integrated circuits. For the objectives of the bachelor's thesis, the ERSA HR600 repair soldering station was used and related to this, workflows were created and profiles were optimized for placement and reflow soldering of BGA integrated circuits, and the described processes were tested on 2 types of printed circuit boards that differed in size and component density including BGA package.
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Development of an electric shock welding method for a combination of thin-film and thick-film structures
Hruška, Andrej ; Jankovský, Jaroslav (referee) ; Otáhal, Alexandr (advisor)
At the start this bacherol thesis deals with connection methods of terminals on thick and thin-films. One of the methods, which this thesis is mostly orientated on, is a terminal connecting with the shock welding method. The point was to test, if this method of connecting terminals is suitable for a combination of the thick and thin-films applications. The experiment included making of template for vapour plating, vapour plating of thinfilm on substrate, its galvanic plating and testing. Mechanical tensile strength of created welds was tested and in the end there was done the optical inspection of internal interface of welds.
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FPGA based controller drive of BLDC motor
Makówka, David ; Kváš, Marek (referee) ; Valach, Soběslav (advisor)
This bachelor’s thesis concerns different control approaches for driving a BLDC motor using an FPGA chip. Also, a custom type of an inverter circuit was designed. A six-step commutation control scheme has been implemented, to ease the future integration of field-oriented control. The field-oriented control has been designed and simulated in a semestral thesis using a MATLAB Simulink tool. The targeted platform is the FPGA development board Basys 3. Hardware is rated to deliver up to 6 A of current. The handling of error conditions is mainly provided by a DRV8305 gate driver integrated circuit. Errors are also forwarded to the FPGA, for performing further actions. The structure of a controlling scheme is accustomed to the tuning of motor parameters rather than for end-users. Parameters can be set during motor operation and states of the control scheme are stepped separately. The sensing of voltages and currents is handled by an analog-digital converter.
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Modification of PCB cleaning process after removing BGA component
Procházka, Adam ; Bžoněk, Tomáš (referee) ; Řezníček, Michal (advisor)
This bachelor thesis deals with the modification of DPS cleaning process after the removal of BGA components. The thesis is divided into five main parts including the introduction and conclusion. The introduction comprises an assignment and aim of the thesis. The first, theoretical, part then deals with different kinds of soldering, individual types of solders and the rework process itself. The second part examines the whole practical part in detail, from the proposal of the test printed circuit board to its mounting, soldering and subsequent testing. Also, it explains the practical tests for connectors. The third part then describes the board testing by thermal cycling. The last part consists of the summary of results, a comparison of individual soldering pastes and conclusion.
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Service life increasing of spare part tools for ground cultivation
Černín, Jiří ; Mrňa, Libor (referee) ; Sigmund, Marian (advisor)
This diploma thesis deals with increasing the service life of parts intended for soil cultivation. The work evaluates the current possibilities of increasing the utility value of spare parts. Practical tests will provide recommendations for the most appropriate method to increase durability. The work examines uncharted methods of testing soldered joint. The results are evaluated in terms of quality and economic profitability. All results from this work are based on the basis of practical tests of plowing machine in rocky soil.
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