APPLICATION OF RAPID PROTOTYPING TECHNOLOGY IN DESIGNING ROBOTS AND PERIPHERAL DEVICES

MM (Modern Machinery) Science Journal, March 2016
DOI:10.17973/MMSJ.2016_03_201544

JAN LIPINA, VACLAV KRYS
VSB - TU Ostrava, Department of Robotics, Faculty of Mechanical Engineering, Ostrava-Poruba, Czech Republic
e-mail: jan.lipina@vsb.cz
Abstract
The Department of Robotics at the Technical University of Ostrava has disposed of the Rapid Prototyping technology (hereinafter as RP) since 2009. From the very beginning, there were efforts to print not only models to present various concepts and prototypes to the public, but primarily functional technical solutions. Over the time, there have been a large number of printed parts as well as functional units with the print share reaching up to 80%. Related to the need to adjust the models for printing in order to achieve the best results, both for own and commercial production, there have been many doubts how to suitably solve certain construction elements. The paper describes some of problems that have arisen and tries to find adequate solution using experimental methods. The paper is designed as a review of the solved issue aiming at providing a set of findings which can be subsequently used in designing parts produced by the RP technology, on condition that professional production systems and polycarbonate materials with mechanically removable support are used.

Keywords: rapid prototyping, polycarbonate, Stratasys, bend tests, tensile tests, screw connection
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THE DESIGN AND SIMULATION OF THE SAFETY PART OF THE EXTRACTION SYSTEM OF THE HEAVY ION CYCLOTRON DC280 USING COMSOL MULTIPHYSICS

MM (Modern Machinery) Science Journal, March 2016
DOI:10.17973/MMSJ.2016_03_201566

TOMAS MAAR1,2, VLADIMIR I. KAZACHA2
1 BUT, Department of Energy Engineering, Energy Institute, Faculty of Mechanical Engineering, Brno, Czech Republic
2 Laboratory for Nuclear Reaction, Joint Institute for Nuclear Research, Dubna, Russia

e-mail: y101639@stud.fme.vutbr.cz
Abstract
This paper presents the design and thermal analysis using COMSOL Multiphysics® of safety part of the extraction system of the heavy ion cyclotron DC280. The heavy ion cyclotron DC280 was developed and is being constructed at the Flerov Laboratory of Nuclear Reactions of the Joint Institute for Nuclear Research. High thermal power of the extracted beam is a risk of destruction for the elements of the beam extraction system. The beam power is expected to be about 2.5-3 kW and the beam diameter is about 10 mm. The proposed model analyses mainly the temperature on the exposed by the beam area of the windows, contact temperature between the windows made of molybdenum and the body made of cooper, and temperature on the wall of the cooling channel. The article also discusses possibility of design for experimental verification. The results based on thermal analysis will give us a possibility to choose an appropriate configuration for its experimental verification on the stand.
Keywords: thermal analysis, cyclotron, beam extraction system, COMSOL Multiphysics
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INFLUENCE OF CHEMICAL COMPOSITION AND HEAT TREATMENT OF ALSI6CU4 ALLOY ON THE UTILIZATION OF COPPER STRENGTHENING EFFECTS

MM (Modern Machinery) Science Journal, March 2016
DOI:10.17973/MMSJ.2016_03_201567

MARKO GRZINCIC
Illichmann Castalloy, Member of ALICON Group, Zarnovica, Slovakia
e-mail: grzincicm@illichmann.sk

Abstract
The paper presents deals with a quantification of intermetallic phases rich in copper in the alloy AlSi6Cu(X) with a variable content of copper, modified with strontium and during thermal treatment age hardening in artificial or natural way. It concerns variables occurring in the common industrial practice. The rate of solidification, thermal treatment regime and other elements of the alloy chemical composition were not be variated. Microhardness measurements related to a condition of 27 samples. Substructural TEM analysis characterizes the copper alloying condition of the structure matrix. Copper as a hardening element was identified by EDX analysis. Important process and material factors appealing to resultant mechanical properties of the alloy were identified, and the factors having a minimal effect were eliminated.
Keywords: Al-alloys, thermal treatment, hardening, intermetallic, Cu-phase
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HARDNESS AND ELASTICITY OF ABRASIVE PARTICLES MEASURED BY INSTRUMENTED INDENTATION

MM (Modern Machinery) Science Journal, March 2016
DOI:10.17973/MMSJ.2016_03_201601

PAVOL HVIZDOS1, MICHAL ZELENAK2, SERGEJ HLOCH2
1Structural Ceramics Department, Institute of Materials Research of the SAS, Kosice, Slovakia
2Department of Material Disintegration, Institute of Geonics of the CAS, v.v.i., Ostrava, Czech Republic

e-mail: phvizdos@saske.sk

Abstract
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.

Keywords: abrasive, garnet, hardness, elasticity, instrumented indentation
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DUST FREE SURFACE TREATMENT PARAMETERS OF THE THREE-PHASE JET, GENERATED IN THE SANDBOT DEVICE

MM (Modern Machinery) Science Journal, March 2016
DOI:10.17973/MMSJ.2016_03_201602

RYSZARD SOBCZAK1, 3, JAROSLAW PRAZMO2, 3, ANDRZEJ PEREC4, IRENEUSZ CHMIELIK5
1 RS Waterjet, Koszalin, Poland
2 PRO Waterjet, Koszalin, Poland
3 University of Applied Sciences in Wałcz, Poland
4 Jacob of Paradyz University of Applied Sciences in Gorzów Wielkopolski, Poland
5 Taylor Hobson Polska, Warszawa, Poland

e-mail: aperec@pwsz.pl

Abstract
This paper presents an original method for producing three-phase jet to enable efficient treatment of technical surface using the Sandbot apparatus. Exemplary results of studies describing the geometrical structure of machined surfaces in the context of their quality grading.The stream of three-phase (air-water-abrasive) generated in innovative Sandbot devices [Prazmo 2012] is a modern and high-performance tool for dust-free surface treatment technology. Sandbot equipment enables the use of a variety of abrasive materials [Praźmo 2010, Sobczak 2013] including quartz sand (silica). Quartz sand may only be used in methods for wet and damp air in accordance with applicable in Poland guidelines contained in the Regulation of the Minister of Economy, Labour and Social Policy on occupational health and safety when cleaning the surface, spray painting and thermal spraying [Regulation 2004]. Furthermore, it describes the construction, operational and technological parameters and the area of innovative Sandbot devices, patented, designed and manufactured in Poland. These devices are intended for dust-free and high-performance cleaning of technical surface by the air-water-abrasive stream. They are used especially in industry, construction, and services.

Keywords: Three-phase jet, surface treatment, geometrical structure, dust free machining
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ABRASIVES AND POSSIBILITIES OF INCREASE IN EFFICIENCY OF ABRASIVE WATERJETS

MM (Modern Machinery) Science Journal, March 2016
DOI:10.17973/MMSJ.2016_03_201603

LIBOR SITEK1, PETR MARTINEC2
1Institute of Geonics of the CAS, v.v.i., Department of material disintegration, Ostrava-Poruba, Czech Republic
2Institute of Geonics of the CAS, v.v.i., Department of laboratory research on geomaterials, Ostrava-Poruba, Czech Republic

e-mail: libor.sitek@ugn.cas.cz

Abstract
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.
Keywords: high-speed waterjets, abrasive waterjets, abrasives, garnet, zirconia
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METHODOLOGY OF HYDRAULIC SYSTEM DEVELOPMENT USING EXPERIMENTAL STAND AND COMPUTER MODELING

MM (Modern Machinery) Science Journal, March 2016
DOI:10.17973/MMSJ.2016_03_201604

JOSEF NEVRLY, JAN BRANDEJS
BUT, Faculty of Mechanical Engineering, Institute of Machine and Industrial Design, Brno, Czech Republic
e-mail: nevrly@fme.vutbr.cz

Abstract
This paper deals with creation of methodology that can be effectively used in design and development of a more complex hydrostatic system. In future, the designed hydraulic system should fulfill given functions respecting the given parameters. It is usually possible to create such a system using several methods but not all of them lead to a full success without a risk of failure. It is not possible to create clear-cut directions for reliable option of design methodology but in dependence on the type of solved problem and demands on the results, a suitable choice of methodology can be shown e. g. by means of an example of verified and successful process of system designing.
Using the concrete example, the paper shows a methodology of successful development of a hydraulic system where demanding research claims had to be fulfilled. To carry out this research, it was necessary to use a special experimental stand and computer modeling to gain the optimum effectiveness.

Keywords:
methodology, project, design, development, hydraulic, system
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LOAD TORQUE ANALYSIS OF INDUCTION MACHINE

MM (Modern Machinery) Science Journal, March 2016
DOI:10.17973/MMSJ.2016_03_201605

MARTIN KROUPA, CESTMIR ONDRUSEK, ROSTISLAV HUZLIK
BUT, Faculty of Electrical Engineering and Communications, Dept. of Power Electrical and Electronic Engineering, Brno, Czech Republic
e-mail: xkroup07@stud.feec.vutbr.cz
Abstract
This paper is focused on the load torque evaluation of the induction machine. There is described the problem of load torque oscillations and its impact to other electromagnetic variables in induction machine. In this article, the issue of modulated stator current is resolved and behaviors of amplitude and phase modulation are separated using demodulation algorithms after that. Newly, the variable load torque is retroactively determined from coefficients of amplitude and phase modulation not from nondemodulated stator current frequency spectrum. At last, theoretically acquired knowledge is compared with real measurement and different values of amplitude and phase modulation obtained from the mathematical motor model and from the real measurement are discussed. In the future, this analysis can be used as a basis for online diagnosis of driven load.
Keywords: induction machine, diagnosis, amplitude modulation, phase modulation, stator current signature, load torque oscillation, spectral analysis.
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STUDY OF QUALITY OF NINE ALUMINIUM ALLOYS SURFACES CREATED USING ABRASIVE WATERJET

MM (Modern Machinery) Science Journal, March 2016
DOI:10.17973/MMSJ.2016_03_201608

DAGMAR KLICHOVA, JIRI KLICH, LUCIE GURKOVA
Institute of Geonics of the CAS, v.v.i, Ostrava, Czech Republic
e-mail: dagmar.klichova@ugn.cas.cz
Abstract
The article focuses on the normalized method of measurement and evaluation of a surface texture created using the abrasive waterjet. It detects selected amplitude parameters of a roughness profile providing a form of a quantified description of properties of a surface topography. It studies the change in quality of machined surfaces created by the abrasive waterjet in nine selected materials of aluminium alloys when changing the traverse speed. Studied samples were measured by an optical profilometer MicroProf FRT and further analyzed with the Scanning Probe Image Processor software (SPIP). The results of experiments show that the observed amplitude parameters of roughness are influenced by the increasing traverse speed.
Keywords: surface roughness, abrasive waterjet, study of quality, aluminium alloy, optical profilometer
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