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Mechanical Properties of solder joint
Meliš, Josef ; Starý, Jiří (referee) ; Stejskal, Petr (advisor)
This thesis deals with the differences between the mechanical properties of surface conditionings of the printed circuit boards and various types of soldering pastes. The practical part of the thesis describes all the steps necessary to conduct the experiment. The experiment will evaluate the measured mechanical strength of the solder joint for each surface conditioning, the types of solders, the increase in thickness of the intermetalic layer during long-term aging and the change in the structure of the solder joint.
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Design of Soldering Gun
Běhal, Tomáš ; Křenek, Ladislav (referee) ; Ondra, Martin (advisor)
This bachelor thesis deals with the design of transformer soldering gun. The product is analyzed from the historical, technical and design ways at first. Subsequently, the new design of this product is proposed, with respect to ergonomic, technical, aesthetic and psychological aspects.
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Reliability of LED Panels Solder Joints
Šimon, Vojtěch ; Špinka, Jiří (referee) ; Starý, Jiří (advisor)
Thesis is focused on the effect of heating factor on quality of solder joints. In theoretical part is solved reflow soldering technology, problematice of solder paste choice or criteria of soldering profile setting. The practical part is dedicated to demonstrating the impact of heating factor on solder joint quality. There are used X-Ray analysis, microsections and electron microscopy. In the final part of this thesis are summarized knowledge from theoretical part and experimental obtained results to defend of next steps in diploma thesis.
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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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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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