Modern Machinery (MM) Science Journal, February 2017

QUALITY OF ALUMINIUM ALLOY SURFACE AFTER WEDM

KATERINA MOURALOVA, JIRI KOVAR, LENKA KLAKURKOVA, MILAN KALIVODA
Keywords: quality of surface | aluminium alloy | impact layer | electrical discharge machining | WEDM

Efficient machining using wire electrical discharge machining (WEDM) technology is a compromise between cutting speed and resulting surface quality. Typical morphology of the surface machined by WEDM shows a plenty of craters caused by electrospark discharges produced during the cutting process. This work is focused on assessing the impact of machine setting parameters on quantitative and qualitative ev (…)

EVALUATION OF A TOTAL HEIGHT OF PROFILE OF THE SURFACE MACHINED BY WEDM

KATERINA MOURALOVA, JIRI KOVAR, LENKA KLAKURKOVA
Keywords: total height of profile | aluminium Al 99.5 | titanium alloy Ti-6Al-4V | steel X210Cr12 | electrical discharge machining | WEDM

Wire electrical discharge machining (WEDM) is a non-conventional machining technology, which has become indispensable in many industries. Typical morphology of a surface machined by wire spark erosion (WEDM) is characterized by plenty of craters caused by electrospark discharges produced during the cutting process. The study deals with the evaluation of the surface morphology using a 3D colour-filtered (…)

FINITE ELEMENT SIMULATION OF THIXOFORMING

FILIP TIKAL
Keywords: experiments | DEFORM | JMatPro | FEM | computer simulation | mini-thixoforming

Thixoforming is an innovative technology in metal processing, which combines the advantages of casting and forging. Thixoformed material is formed in the semi-solid state. The processed alloy is heated to the transition temperature between solid and liquid in order to obtain improved material properties. Computer simulations for thixoforming technology are logically divided into solution approaches in (…)

PROCESSING OF NEARLY PURE IRON USING 400W SELECTIVE LASER MELTING – INITIAL STUDY

DAVID PALOUSEK, LIBOR PANTELEJEV, TOMAS ZIKMUND, DANIEL KOUTNY
Keywords: pure Fe | mechanical properties | porosity | pure iron | selective laser melting

The proposed article deals with development and initial tests of nearly pure iron powder ATOMET Fe AM (Rio Tinto, QMP) using 400W selective laser melting technology. Magnetic properties in conjunction with 3D printing possibilities of metals could be used in many applications. Metal powder was analyzed for verification of distribution and shape of particles. The main laser parameters such as laser power (…)

ARTIFICIAL MUSCLES: STATE OF THE ART AND A NEW TECHNOLOGY

PETR KOCIS, RADEK KNOFLICEK
Keywords: actuator | electrostatics | dielectric elastomer | pneumatic muscle | artificial muscle

Pneumatic artificial muscles have been known since 1930s. Their advantage is in a simple design and good specific power [Madden 2004, Kocis 2016b]. However, the critical disadvantage is the requirement of an air compressor or a compressed air accumulator. This disadvantage disables the use of pneumatic artificial muscles in mobile robotics. In constrast to pneumatic artificial muscles dielectric elastom (…)

MECHANICAL PROPERTIES AND POROSITY OF Ti-6Al-4V ALLOY PREPARED BY AM TECHNOLOGY

PATRIK PETROUSEK, JANA BIDULSKA, ROBERT BIDULSKY, ROBERT KOCISKO, ALICA FEDORIKOVA, RADOVAN HUDAK, VIKTORIA RAJTUKOVA, JOZEF ZIVCAK
Keywords: Microstructure | mechanical properties | Ti-alloy | tensile test | LS | porosity

The specimens manufactured using principle LS (Laser sintering) by the additive manufacturing technologies from the Ti-6Al-4V (Grade 5) titanium alloy are investigated. The powder Ti-6Al-4V is well-known for its slightness and high strength. Metal additive manufacturing processes produce parts with porosity. The possibility of changes in a porosity during an additive manufacturing build may also be an i (…)

THE DESIGN OF THE 3D PRINTER FOR USE IN GASTRONOMY

PETR ZELENY, VOJTECH RUZICKA
Keywords: RepRap | printing technologies | additive manufacturing | food printing | 3D chocolate printing | 3D printing

The research presented in this article deals with the design of appropriate technology and with an implementation of the structural design of the 3D printer for use in gastronomy. A printer concept of RepRap open source project was used and completed with own solution of the extrusion head for printing with chocolate. Chocolate was chosen since it can be easily converted by heat into a plastic-like mate (…)

CONSTRUCTION OF ANTI-FLOOD BARRIERS SOLVED BY RECYCLING OF WASTE PLASTICS

JURAJ ONDRUSKA, LUBOMIR SOOS, VILIAM CACKO, IVETA ONDEROVA
Keywords: flood protection | flood wall | selfstabilization | flood barrier | watergates | flooding | recycled plastic

The structure of the development anti-flood barriers from recycled plastics is composed from metal and plastic sources. When designing the geometry and constructing the barrier, the first stage was to design a structure based on the shape of unified blocks made from PP and PE. The last generation of metal construction was constructionally optimized by renowned producer KONSTRUKTA-Industry, a.s.. Unified (…)

MECHANICAL PROPERTIES OF PRODUCTS MADE OF ABS WITH RESPECT TO INDIVIDUALITY OF FDM PRODUCTION PROCESSES

MARTIN SEIDL, JIRI SAFKA, JIRI BOBEK, LUBOS BEHALEK, JIRI HABR
Keywords: ABS | RepRap | Fortus 450 | Dimension SST 768 | injection moulding | FDM

Nowadays the technologies originally developed only for prototype production are involved among modern production techniques. This trend is induced mainly by developing of new materials and very effective improvement of rapid prototyping production methods and tools. The resulting mechanical properties of the products are now fully comparable with the properties of parts produced with using the technolo (…)

DETECTION OF GLASS EDGE CORRUGATION FOR CUTTING DISTANCE OPTIMISATION

ONDREJ MATUSEK, ZDENEK VIT, VLASTIMIL HOTAR
Keywords: glass corrugation | glass deformation | transparent materials | 3D data | 3D acquisition

This paper proposes a new method of surface shape determination for transparent objects. Concretely it deals with a detection of glass-sheet corrugation nearby the sheet edge. This variable is important for cutting distance optimization. Time-dependant laser reflection was used to generate a surface profile. Projection dependence was set. That allows calculating a distance of deformed part. Results were (…)

LOGISTICS MOTION ASSIGNMENTS IN ROBOTIZED SYSTEMS

NAQIB DANESHJO, MILAN MAJERNIK, MARIÁN KRÁLIK, ENAYAT DANISHJOO
Keywords: off-line programming | collision free trajectory | trajectory planning | logistics | Robot

The authors within the scientific contribution present the optimization of the trajectory of an industrial robot in selected systems. The thesis deal with the task of creating collision-free trajectories of industrial robots, based on the geometric information describing the configuration space with respect to the possibility of robot kinematic. There are introduced the basic methods of exact and probab (…)

RECOVERY OF WASTE USING THE GASIFICATION AND OXIDATION OF SCRAP TIRES

FRANTISEK JANICEK, MARKUS GIEMZA, MILAN PERNY, VLADIMIR SALY
Keywords: syngas | gasification | pyrolysis | renewable energy sources | microwave reactor

The investigation of the use of microwave gasification as a method that allows to obtain energy from end-of-life (ELTs) tires was subject of this study. The gasification of the waste was carried out within the laboratory microwave reactor HR – Lab, followed by the microwave-assisted oxidation of synthesis gas (syngas) which took place in a small microwave reactor – Microwave Oxidation System (MOS). Deta (…)

THE ECONOMIC SUSTAINABILITY OF A MODEL THAT BALANCES ECOLOGICAL AND POWER SUPPLY NEEDS

SNEZANA KIRIN, PAVEL KOVAC, BORISLAV SAVKOVIC, SLADJANA MIRJANIC, LUBOMIR SOOS
Keywords: sustainable development | economic aspects | degraded land | energy crops

Energy from biomass have a number of good features. These crops have a positive effect on the environment, ecology and environmental protection because they serve as a means of rebuilding the degraded area. This paper presents the Miscanthus plant that is for some time used as energetic. It also present a research that has carried on the degraded surface of the landfill. The establishment of plantations (…)

TOOLS OF ENVIRONMENTAL MANAGEMENT AND EU CIRCULAR ECONOMY

EMILIA BODOVA
Keywords: tools | Requirements | Ecodesign | environmental management systems

Among the priority areas of European Union environmental policy is to create a legal, technical and financial conditions to stimulate the effective use of resources and moving towards zero waste. To achieve these objectives, the European Commision is preparing measures in the form of the EU Action Plan for Circular economy. In the circular economy, most products, that would have been disposed in the lin (…)

SCRAP TYRES AND EXPLOITATION OPTIONS FOR TYRE RUBBER MIX

JOZEF VIGLASKY, JURAJ KLUKAN, MARIAN JEZO
Keywords: thermal treatment | secondary raw material | scrap tyres

This paper deals with scrap tyre management and current exploitation routes. The disposal of tyre waste is increasing day by day at exponential rate. Exploitation of end-of-life tyres is a significant environmental issue and challenge for all countries. Rubber has long-term decay in natural conditions due to high durability for lot of climate or soil exposure and biological attacks. Scrap tyres within m (…)

 SECONDARY PROPOSAL OF COUPLING MECHANISM ROTATION UNIVERSAL MODULE

MIROSLAV STOFA, JOZEF SVETLIK, MARTIN PITUK
Keywords: big bearing flange | release pin | security pin | locking pin | rotary revolving unit | rotation universal module

The authors focus on the adjustment of coupling mechanism Rotation Universal Module that offers unlimited rotation of movement. The module has been designed to achieve different kinematic structures by use of an identical module. A unique interface mechanism, which has undergone several modifications and amendments, has been designed for this module. The main objective is to achieve efficient and more s (…)

SUSTAINABLE BUILDING DESIGN AND ENVIRONMENT

MILJAN SUNJEVIC, MIRJANA VOJINOVIC-MILORADOV, DARKO REBA, MILJANA ZEKOVIC, BORIS OBROVSKI, NEVENA ZIVANCEV
Keywords: eco-building | innovation | sustainability | total energy calculations | full-potential calculation | thermal conductivity

Architecture and environment are naturally inseparable. Without understanding architectural relationship to natural systems and environment, it is impossible to design proper buildings. It is impossible to understand the natural environment without knowing how human intervention affects it – both positively and negatively. As man and nature begin to recognize their interdependence and relationship, the (…)

QUALITY CONTROL OF EARTH CONSTRUCTION FROM ENVIRONMENTAL PROGRESSIVE MATERIALS

EVA REMISOVA, MATEJ HAJEK, MARTIN DECKY, MATUS KOVAC, MICHAL JUHAS
Keywords: recycled aggregate | ferro silico manganese slag | Californian Bearing Ratio | alternative material | environment | Earth construction

The article gives special attention to codified clauses of the road construction law, the relevant clauses of standards and technical regulations to design and control the quality of earth constructions built from alternative recycled material. It is important to provide compliance between the values of relevant characteristics used within the design procedure and the subsequent quality control of earth (…)

PAPERMAKING SLUDGE PROPERTIES FOR USE IN CONSTRUCTION AND BUILDING

LUBOMIR SOOS, MILOS MATUS, MARCELA POKUSOVA, PETER KRIZAN, PAVEL KOVAC
Keywords: construction industry | tests | experimental building material | sludge modification | papermaking sludge

When processing the waste paper into the tissue paper products, there arises up to 30 to 40 percent of the paper sludge. Today, this sludge is used as an ingredient to manufacture the bricks, to produce compost, or to reclaim the mining pits. The current methods of disposal and recovery of this sludge are cost-intensive, and they often limit the actual quantities of the processed paper waste. Suitably m (…)

APPLICATION OF POLYSTYRENE PROTOTYPES MANUFACTURED BY FDM TECHNOLOGY FOR EVAPORATIVE CASTING METHOD

FILIP GORSKI, WIESŁAW KUCZKO, RADOSŁAW WICHNIAREK, PAWEŁ BUN, PAWEŁ SZYMANSKI
Keywords: 3D printing | Rapid Tooling | evaporative casting | fused deposition modeling

The paper describes possibilities of using additive manufacturing technologies to manufacture single use casting tooling. The foundries usually cooperate with pattern workshops, which manufacture tooling using conventional processes. In case of patterns of complex shapes, it translates into higher costs and longer time of production. An alternative can be use of additive manufacturing (3D printing), pro (…)

ENVIRONMENTAL MANAGEMENT IN DESIGN PROCESS OF MACHINERY

MARIA KRBALOVA, PETR BLECHA
Keywords: Life Cycle Assessment | machinery | engineering material | design process | emission of greenhouse gases

Nowadays more and more intense discussions of professionals are carried out; they are focused on the issues of global warming. One of the latest documents in the fight against the climate change is the New Global Climate Agreement approved during the Climate Conference in Paris in December 2015. Although the signed agreement does not stipulate any timetable or particular targets for individual countries (…)

DUAL NUMBERS ARITHMETIC IN MULTI AXIS MACHINE ERROR MODELING

JAROSLAV HRDINA, PETR VASIK, MICHAL HOLUB
Keywords: CNC machine tools | volumetric accuracy | geometric accuracy | dual number

When a kinematic chain of a multiaxis machine centre is assembled by means of homogeneous matrices, it is possible to include the error representing matrices within and neglect the error terms which do not affect the prescribed accuracy. Classically, such error terms are identified and neglected according to the system of given identities after the matrix multiplication. In our approach, the matrices it (…)