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SMV-2013-09: Elektronová svářečka MEBW-60/2
Zobač, Martin ; Vlček, Ivan ; Dupák, Jan ; Dupák, Libor ; Kapounek, Petr
Licenční poplatek z výroby a prodeje elektronové svářečky MEBW-60/2, jejíž výzkum a vývoj probíhal v ÚPT letech 2006 až 2008. Zařízení je výrazně zdokonalenou verzí elektronové svářečky vyvinuté v ÚPT během minulých dvaceti let. Disponuje pracovní komorou o objemu 7 litrů, elektronovou tryskou s urychlovacím napětím do 60 kV. Výkon svazku je plynule regulovatelný do 2 kW. Pro pohyb svařence je možné využít dvouosý motorický manipulátor. Řízení svářečky je plně digitální a všechny funkce jsou uživateli dostupné pomocí přenosného ovládacího pultu. Součástí zařízení je pracovní stůl s pracovní plochou dostatečně velkou pro provedení potřebných přípravných prací. Prostorové uspořádání zařízení je variabilní, což umožňuje jeho přizpůsobení dispozici v místě instalace.
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Dynamic impact tester of hard thin coatings
Grossman, Jan ; Dupák, Libor ; Fořt, Tomáš ; Sobota, Jaroslav
An impact test has been used to evaluate the impact wear resistance of nanostructured hard coatings using a system developed at the Institute of Scientific Instruments in collaboration with the Brno University of Technology. After the test, wear scars were evaluated by means of scanning electron microscope, spectral analyses and profilometer. The impact test offers an important new method for the determination of both the fracture toughness and wear behaviour of hard thin coatings.
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Institute of Scientific Instruments: An Overview Presenatation
Kolařík, Vladimír ; Zobač, Martin ; Fořt, Tomáš ; Vlček, Ivan ; Dupák, Libor ; Mikmeková, Šárka ; Mikmeková, Eliška ; Mrňa, Libor ; Horáček, Miroslav ; Sobota, Jaroslav
The aim of this contribution is to present the Institute of Scientific Instrument of the Academy of Sciences of the Czech Republic, mainly from the potential of applied research viewpoint. It covers mainly the six application fields including material study of metals and alloys, nano layer residual stress observation methods, 2 kW fibre laser, impact testing of hard coatings, e-beam welding, machining and engraving, and finally e-beam lithography. Recently achieved results as well as the new application potential are presented. Furthermore, each topic is assumed to have a separate presentation prepared in more details within this event. A brief overview follows. Scanning low energy electron microscopy (SLEEM) is increasingly becoming recognized as a valuable analytical tool in the field of materials science. The SLEEM is also used for observation of compressive stress in nano layers that leads to wrinkling and film delamination. Using the fibre laser, we can offer 3D laser welding and cutting of various type of materials and laser surface hardening too. For the hard coatings testing and evaluation of their impact resistance a new method was suggested (Dynamic Impact Wear Test). During testing the specimen is cyclically loaded by tungsten carbide ball that impacts of the coating/substrate surface. In house e-beam welding machine allows for welding, machining, engraving and other utilizations of intense electron beam. The group of micro lithography is able to prepare micro and nano structures in thin layers of metals and other materials; including the characterization of the realized structures
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Electron beam cutting of non-metals
Dupák, Libor
Various materials are difficult to cut or drill, e.g. due to their mechanical properties (hardness, fragility). Also, sometimes the required hole shape and dimensions may be difficult to obtain by mechanical machining or the efficiency of such process is low. Electron beam machining is one way to overcome these issue. It is based on the melting and evaporation of the material by the intense electron beam. The presented experiments were performed on the desktop electron beam welder MEBW-60/2, developed at the Institute of Scientific Instruments AS CR, v.v.i. at Brno. It is also manufactured and sold by the Focus GmbH company under licence. In the following experiments, several sets of grooves were prepared, both in quartz glass and AI2O3 ceramics, to find out the influence of various beam parameters on groove dimensions. The experimental conditions were as follows: acceleration voltage 50 kV, beam current 0.1-1 mA, machining speed 2.5-50 mnvs'1.
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Mikroobrábění elektronovým svazkem
Dupák, Libor ; Zobač, Martin
Článek popisuje experimentální zařízení na mikroobrábění elektronovým svazkem spolu s několika experimenty. Zařízení je odvozeno ze stolní elektronové svářečky SES-1 vyvinuté na ÚPT v Brně. Pomocí tohoto zařízení byla úspěšně vrtána řada rozdílných materiálů jako nerezová ocel, titan, křemenné sklo, keramika a některé plasty.
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