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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Návrh a výroba polohovatelného křesla z QSB desky spojené pomocí samosvorných konstrukčních spojů

Fait, Petr January 2014 (has links)
The aim of this dissertation was to prepare a literery overview of the material broadly used for the wooden constructions and their consecutive experimental trials focused to strength and module of elasticity in bending at strictly selected large oriented strandbo-ards, quality strandboards and chipboards at different levels of moisture. The next phase of the dissertation was to prepare a statistics evaluation of gained data and results during the evaluation period which are outlined at different forms including tables and statistics charts.
2

Návrh nové technologie výroby vybrané součásti / A new technology of a machined part

Reňák, Antonín January 2011 (has links)
The fully fashioned master’s thesis within the frame of the master’s study at the Faculty of mechanical engineering is focused on manufacture problems of complex shaped tool specifically for splitting of wood. In the thesis the concept of construction of the tool is analysed with emphasis on correct and efficient functionality. Large emphasis is laid on the analyse of action of force on the gusset and the analyse of conditions of self-locking. This knowledge is applied to the concept of construction of the tool. In the next part the procedure of manufacture is drafted with specification of suitable tools and machines. Then CNC program is elaborated with using of parametrical programming with mathematical function. Then finally the valuation of theoretical results with real production semiautomatic lathe SPN 12 CNC with operation system Simumerik 810D, SPN 12 CNC.
3

Dynamické vlastnosti osy C pro multifunkční soustružnické centrum / Dynamic Behaviours of the C Axis Drive for Multifunction Cutting Center

Křepela, Jan January 2011 (has links)
his Disertation thesis involves the creating of the simulation model of the C axis drive over mentioned machine and them verification on the prototype of this machine. C axis is controlled with position feedback. Simulation model was created before the realisation of the machine prototype for the preliminary identification of the dynamic behaviours in the working cycles and them opportunity of the realisation this conception. C axis is constructed with worm gear and is controlled with help of Master-Slave drive. This torque drive eliminates the production backlash in the worm gear. The multifunction turning center, where is used this C axis, is determinate for heavy duty roughing cutting of the forged peaces, where is problem with dynamic stability of the cutting process. Simulation model includes the problems with multi-body mass system, friction on the worm gear, self locking, damping on the worm gear and the optimization of the parametrs for many regulators. Simulation model was verified on the prototype of the machine. Achieved results bring the new knowledge, which are used for simulation complicated machine nodes and this knowledge is used for research and developing of the similar mechatronics system.

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