Design of subassemblies Trimill machine

Cílem této diplomové práce je návrh automatického systému pro výměnu frézovacích hlav. Diplomová práce byla zadána ve spolupráci se společností TRIMILL, a.s. První část se věnuje stručné analýze problematiky automatizace a obsahuje průzkum současného trhu se systémy automatické výměny frézovacích hlavu konkurenčních výrobců. Druhá část se zabývá volbou možných variant samotné výměny frézovacích hlav, volbou pohonu, vedení atd. Poté je proveden konstrukční návrh zvoleného systému, návrh pohonu a vedení, bezpečnostní prvky jako detekce hlav, senzorika pohyblivých částí systému a kytování celého systému, nakonec je provedena kontrola nosné části systému a její kytování.The aim of this thesis is design of automatic system for the exchange of milling heads. The diploma thesis was awarded in cooperation with company TRIMILL, a.s. The first part is devoted to a brief analysis of the problems of automation and includes a survey of the current market system of automatic exchange of milling head competing manufacturers. The second part deals with the choice of possible options exchange itself milling heads, the choice of propulsion, guidance etc. Afterwards there is an engineering design of chosen system, the engineering of leading and driving systems, safety features such as detection heads, sensors moving parts of the system and covers the entire system , then analysis of carrier system and covers are made .

Design of large capacity ATC

Cílem této práce je návrh jedné části systému automatické výměny nástrojů pro těžké obráběcí centrum na nerotační součásti. Bakalářská práce byla zadána ve spolupráci se společností TRIMILL, a.s.. První část se věnuje důkladné analýze řešená problematiky a obsahuje obecný úvod od systémů AVN a jejich základní rozdělení. Druhá část se zabývá návrhem variant a poté je proveden konstrukční návrh vybraného řešení manipulátoru včetně dimenzování hlavních částí. Součástí práce je 3D model a výkresová dokumentace.The aim of this thesis is to design one part of a system for the automatic exchange of tools on a heavy machining center for non-rotating parts. This thesis was commissioned in cooperation with TRIMILL, a.s.. The first part is devoted to a thorough analysis of the issues addressed and contains a general introduction to AVN systems and their basic divisions. The second part deals with the various options of design and is followed by an engineering design of the chosen solution including the dimensioning of the main parts. The work includes a 3D model and drawings.

Compositional and thermal equilibration of particles, drops and diapirs in geophysical flows

International audienceCore formation, crystal/melt separation, mingling of immiscible magmas, and diapirism are fundamental geological processes that involve differential motions driven by gravity. Diffusion modifies the compo- sition or/and temperature of the considered phases while they travel. Solid particles, liquid drops and viscous diapirs equilibrate while sinking/rising through their surroundings with a time scale that depends on the physics of the flow and the material properties. In particular, the internal circulation within a liquid drop or a diapir favors the diffusive exchange at the interface. To evaluate time scales of chemical/thermal equilibration between a material falling/rising through a deformable medium, we propose analytical laws that can be used at multiple scales. They depend mostly on the non-dimensional Péclet and Reynolds numbers, and are consistent with numerical simulations. We show that equilibration between a particle, drop or diapir and its host needs to be considered in light of the flow structure complexity. It is of fundamental importance to identify the dynamic regime of the flow and take into account the role of the inner circulation within drops and diapirs, as well as inertia that reduces the thickness of boundary layers and enhances exchange through the interface. The scaling laws are applied to predict nickel equilibration between metals and silicates that occurs within 130 m of fall in about 4 minutes during the metal rain stage of the Earth's core formation. For a mafic blob (10 cm diameter) sinking into a felsic melt, trace element equilibration would occur over 4500 m and in about 3 years

Geoneutrinos

Neutrino geophysics is an emerging interdisciplinary field with the potential to map the abundances and distribution of radiogenic heat sources in the continental crust and deep Earth. To date, data from two different experiments quantify the amount of Th and U in the Earth and begin to put constraints on radiogenic power in the Earth available for driving mantle convection and plate tectonics. New improved detectors are under construction or in planning stages. Critical testing of compositional models of the Earth requires integrating geoneutrino and geological observations. Such tests will lead to significant constraints on the absolute and relative abundances of U and Th in the continents. High radioactivity in continental crust puts limits on land-based observatories' capacity to resolve mantle models with current detection methods. Multiple-site measurement in oceanic areas away from continental crust and nuclear reactors offers the best potential to extract mantle information. Geophysics would benefit from directional detection and the detectability of electron antineutrinos from potassium decay

Geophysical and geochemical constraints on geoneutrino fluxes from Earth's mantle

Knowledge of the amount and distribution of radiogenic heating in the mantle is crucial for understanding the dynamics of the Earth, including its thermal evolution, the style and planform of mantle convection, and the energetics of the core. Although the flux of heat from the surface of the planet is robustly estimated, the contributions of radiogenic heating and secular cooling remain poorly defined. Constraining the amount of heat-producing elements in the Earth will provide clues to understanding nebula condensation and planetary formation processes in early Solar System. Mantle radioactivity supplies power for mantle convection and plate tectonics, but estimates of mantle radiogenic heat production vary by a factor of more than 20. Recent experimental results demonstrate the potential for direct assessment of mantle radioactivity through observations of geoneutrinos, which are emitted by naturally occurring radionuclides. Predictions of the geoneutrino signal from the mantle exist for several established estimates of mantle composition. Here we present novel analyses, illustrating surface variations of the mantle geoneutrino signal for models of the deep mantle structure, including those based on seismic tomography. These variations have measurable differences for some models, allowing new and meaningful constraints on the dynamics of the planet. An ocean based geoneutrino detector deployed at several strategic locations will be able to discriminate between competing compositional models of the bulk silicate Earth.Comment: 34 pages, 6 tables, 5 figures, 2 supplementary figures; revised version submitted to Earth Planet. Sci. Let