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Ostrava, Czech Republic

Hvizdos P.,Slovak Academy of Sciences | Zelenak M.,Institute Of Geonics Of The Cas Vvi | Hloch S.,Institute Of Geonics Of The Cas Vvi
MM Science Journal | Year: 2016

Basic mechanical properties of seven types (from seven different sites) of abrasive garnet particles used for water jet cutting were measured using the technique of instrumented indentation (also called depth sensing indentation or nanoindentation). Hardness and modulus of elasticity were evaluated and compared. All the abrasives had similar measured mechanical properties (hardness 20 - 24.16 GPa), the highest values were found for the Czech garnet. © 2016, MM publishing Ltd. All rights reserved.

Sitek L.,Institute Of Geonics Of The Cas Vvi | Martinec P.,Institute Of Geonics Of The Cas Vvi
MM Science Journal | Year: 2016

The contribution focuses on the research into abrasive materials and possibilities of adjustment of their properties in order to increase the efficiency of the processes of cutting and machining with abrasive waterjets. Cutting ability of commonly available garnet concentrates and non-traditional products which are starting to access to the Czech market were tested and compared. In addition, entirely new garnet products which are not commercially available yet, recycled abrasives, abrasives with various sizes of grains and heat-affected abrasives or abrasives coated with a thin plastic layer were studied. © 2016, MM publishing Ltd. All rights reserved.

Hutyrova Z.,Technical University of Kosice | Scucka J.,Institute Of Geonics Of The Cas Vvi | Hloch S.,Technical University of Kosice | Hloch S.,Institute Of Geonics Of The Cas Vvi | And 2 more authors.
International Journal of Advanced Manufacturing Technology | Year: 2015

The paper deals with the verification of suitability of water jet and abrasive water jet application for the disintegration of rotating samples of wood plastic composites (WPCs) with diameter d = 36 mm. The influence of selected technological factors (traverse speed of cutting head v [mm/min] and size of abrasive particles [MESH]) on the topography of resulting surfaces has in particular been studied. Surface topography and quality have been assessed using the methods of optical and confocal microscopy and optical profilometry. The presented procedures and results of experiments demonstrate the technology of abrasive water jet as an appropriate tool for the rough machining of WPCs and similar composite materials. In addition, the application of this technology can effectively solve the problem of the melting of the polymer matrix and its subsequent sticking to the functional parts of a cutting tool resulting from conventional turning. © 2015 Springer-Verlag London

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