Modern Machinery (MM) Science Journal, December 2016

ACCURACY OF MEASUREMENT IN NANOMETROLOGY

JAN SRAMEK, ROBERT JANKOVYCH
Keywords: ruby ball | nanometrology | measuring device | measurement uncertainty | measurement reproducibility | measurement repeatability | length measurement | accuracy of measurement

The presented article focuses on measurements of extremely small dimensions in nanometrology using tactile probes. It addresses a newly developed method of precise measurements in nanometrology by touch probes, where the measurements are carried out on the machine SIOS NMM-1. The aim of this work is to determine accuracy of measurements on this machine. The main contribution of this work is a creation o (…)

DETERMINATION OF MEASUREMENT ACCURACY OF OPTICAL 3D SCANNERS

RADOMIR MENDRICKY
Keywords: Atos | Acceptance test | calibration | accuracy | 3D digitization | optical 3D scanner | optical measurement

Nowadays, the use of optical 3D digitisation in metrology becomes more frequent and desired. Unfortunately, there are still no binding standards for determining measurement uncertainty of these systems and manufacturers of 3D scanners often use their own standards to define accuracy of their device. This paper introduces a methodology to assess the accuracy of digitisation using 3D optical scanners. The (…)

DESIGN OF EXPERIMENTAL TOOL FOR TUBE HYDROFORMING

MICHAELA CISAROVA, MICHAL HORAK, EVA PETERKOVA
Keywords: experimental tool | hydroforming of tubes | formability

When forming a material, its good formability is essential. It is primarily influence by mechanical properties and chemical composition of the material. Formability can be assessed by mechanical tests, or technological tests. Tensile test is one of the most common mechanical tests used to obtain basic mechanical properties of the material. Another possibility how to evaluate the behavior of a material u (…)

DESIGN OF THE PUMP CONTROLLER OF THE LOW PRESSURE SEWER NETWORK

JAN RUCKA, ONDREJ ANDRS, JIRI KOVAR
Keywords: flushing | clogging | waste water | design | operation | low pressure sewer

The paper deals with the low pressure sewer networks which are used for the systematic drainage of wastewater in locations where it is not technically possible, respectively economically advantageous to build a gravity sewer network. With regard to the size of the urban area, town or drainage site these systems can be very large, involving tens or hundreds of independently working pumps that are connect (…)

DESIGNING A COMPACT DUAL HEAD FOR FLM 3D PRINTING TECHNOLOGY

PETR KELLER
Keywords: design | dual head | 3D printing | FDM | FLM

This article deals with designing a compact head for 3D printing using Fused Layer Modelling technology, better known as Fused Deposition Modelling (FDM) registered by Stratasys. Technically this technology is an extrusion process, which is very popular e.g. with the RepRap community. The aim is to design a print head based on commercially available basic components for printing two different materials, (…)

IMPACT RESISTANCE OF DIFFERENT TYPES OF LATTICE STRUCTURES MANUFACTURED BY SLM

RADEK VRANA, DANIEL KOUTNY, DAVID PALOUSEK
Keywords: topology | energy absorption | gyroid | AlSi10Mg | impact resistance | lattice structure | selective laser melting

The presented paper describes the impact resistance of lattice structure samples made by Selective Laser Melting with the use of AlSi10Mg powder material. The samples with five types of different unit cells of lattice structure were used in this study. The topology of the unit cells structure was changed to describe various impact resistance behavior while the relative density of lattice structure was k (…)

INNOVATION TESTING OF BENDING OF THE MACHINE-TOOL FRAMES

OLDRICH UCEN, LUBOMIR W. NOVOTNY
Keywords: rotating screw | machine-tool frame | Machine tools | FEM calculations | guideways | geometric precision

The paper deals with the issue of geometric precision measuring at large parts (especially at castings having big dimensions) in their manufacturing stage. The large parts of machine-tool frames are required to have their geometric tolerances in thousandths of millimetres. The production or cooperation abilities of the particular company must be adapted to these demands and it is also necessary to adapt (…)

MECHANICAL PROPERTIES OF POWDER CoCrW-ALLOY PREPARED BY AM TECHNOLOGY

ALICA FEDORIKOVA, RADOVAN HUDAK, JOZEF ZIVCAK, ROBERT BIDULSKY, PATRIK PETROUSEK, JANA BIDULSKA, ROBERT KOCISKO, VIKTORIA RAJTUKOVA
Keywords: porosity | mechanical properties | selective laser melting | powder CoCrW-alloy

This study is focused on the evaluation of mechanical properties and microstructure of fabricating Ni-free CoCrWalloy. Samples were prepared by additive manufacturing technology – selective laser melting. The chemical composition of used metal powder was – 60.5% Co, 28% Cr and 9%W. Parameters of SLM were given by powder supplier. The shape of thesampleis designed according to MPIF. After recommended hea (…)

POLICY OF INNOVATION DEVELOPMENT AT THE WOOD SECTOR IN POLAND

IWONA ZABINSKA, ERIKA SUJOVA
Keywords: smart specialization | wood cluster | innovation policy | innovation | wood sector

This article presents synthetically the situation of companies of the wood sector in Poland and describes the directions of development of their innovation, in particular for wood and furniture industry. Furthermore, it describes European Union policy to support activities of producers of the wood sector and identifies selected sources of financing their activities. The article attempts to indicate the (…)

RESEARCH OF SELECTED MECHANICAL PROPERTIES OF THE RECYCLED PLASTIC

LYDIA SOBOTOVA, MIROSLAV BADIDA, TIBOR DZURO, MAREK MORAVEC, PAVOL LIPTAI
Keywords: material | waste | mechanical testing | recycling of plastics | plastics

Plastics are relatively new materials used in almost all areas of human activity, and also in various branches of live and industries. Given the annually growing produce of plastics, their volume are evenly growing up also in the waste, therefore it is necessary to solve the waste from the increasing volume of waste plastic. The contribution deals with the using and testing of sorted plastic waste. From (…)

QUANTITIES AND SENSORS FOR MACHINE TOOL SPINDLE CONDITION MONITORING

LUDEK JANAK, JAKUB STETINA, ZDENEK FIALA, ZDENEK HADAS
Keywords: TCM | FMEA | HUMS | industry 4.0 | sensor fusion | condition based maintenance | machine tool diagnostics

The state-of-art machine tools incorporate a wide variety of sensors and associated signals that are used within the control system or as a process monitoring variables. Machine tool canalso be equipped with additional sensors required by customer or manufacturer with relatively no limitation. Therefore, the key issue is in “separating the wheat from the chaff”. Only those data that can be linked to mac (…)

MACHINING OF HIGHLY ORIENTED PYROLITIC GRAPHITE USING WEDM AND THE RESULTING QUALITY OF THE SURFACE

KATERINA MOURALOVA, JIRI KOVAR, RADIM ZAHRADNICEK
Keywords: EDX | HOPG | Analysis of the chemical composition | quality of surface | highly oriented pyrolytic graphite | electrical discharge machining | WEDM

Highly oriented pyrolytic graphite is a material usually made for specific dimensions, however sometimes the need for altering them may arise. For this reason, it is necessary to choose a suitable technology for machining the material. This study deals with machining a part of highly oriented pyrolytic graphite using wire electrical discharge machining (WEDM). The morphology of the cut and the whole par (…)

RELATIONSHIPS BETWEEN TECHNOLOGICAL AND MATERIAL PARAMETERS DURING DENSIFICATION OF CHERRY TREE SAWDUST

PETER KRIZAN, MILOS MATUS, JURAJ BENIAK
Keywords: moisture content | particle size | compression pressure | briquettes density | briquetting machine | densification | biomass

In this paper, we will present the research findings concerning relationships between technological and material parameters during densification of cherry tree sawdust. In general during in the biomass densification process technological and material variables influence this process and thus the final briquettes quality. The main goal of presented experimental research is to determine the impact and rel (…)

RISKS IN INDUSTRIAL MANAGEMENT SYSTEMS

LUBOS KOTEK, ALES NOSEK, ALOIS FIALA, VOJTECH BARTOS
Keywords: system comparison | risk management | management systems

This paper focuses on the evaluation of the approach to risk management in management systems in technical industries. The underlying framework is the updated standard ISO 9001 which is compared to the requirements of specific standards for the automotive industry, the aviation industry, the railway industry and the chemical and processing industries that fall under major accident prevention (SEVESO). T (…)

SELECTED TIRE CHARACTERISTICS AND THEIR RELATION TO ITS RADIAL STIFFNESS

MARIAN KUCERA, MILAN HELEXA, MICHAL MOLENDA
Keywords: tire stiffness | rolling resistance | soil bin | wheeled chassis | mobile machinery | terramechanics

The article deals with the description of the experimental results of static radial deformation characteristics measurement for the selected tire and its impact on the size of the contact area,  contact pressure and rolling resistance on a solid support. The measurement was carried out on the diagonal tire Mitas TS05 10.0/75-15.3 PR10 in the area of the test soil channel. The radial deformation characte (…)

TECHNOLOGY FOR LOW-TEMPERATURE THERMOCHEMICAL CONVERSION OF BIOMASS

JAN GADUS, TOMAS GIERTL
Keywords: renewable energy sources | biogenic fuel | low-temperature thermochemical conversion | biomass

The paper describes a modern technology of biomass lowtemperature thermochemical conversion for production of biogenic fuels in gaseous, liquid and solid phases. The equipment which was acquired during the life of the project "Building Research Centre AgroBioTech", ITMS code: 26220220180, allows carrying out long-term experiments in pilot conditions. As an example of the high efficiency of the biomass c (…)

VERIFICATION OF PREDICTION METHOD FOR ENERGY CONSUMPTION OF MACHINE TOOL FEED AXES

JIRI TUMA, ZDENEK TUMA, MILOS SYNEK
Keywords: verification | Simulation | feed axis | Machine tool | Energy Efficiency

Energy efficiency of electrical appliances is highly debated topic at present.This topic is transferred especially in industries where are the effects of savings much more significant due to higher energy consumption.In the case of machine tools is at present energy efficiency also a hot topic,basedon the Kyoto Protocol and the European Commission Regulation of energy appliances eco-design.Machine tool (…)

OCCURRENCE OF GLOBULE OF DEBRIS ON SURFACES MACHINED BY WEDM

KATERINA MOURALOVA, RADIM ZAHRADNICEK, RADIM HRDY
Keywords: globule of debris | iron-rhodium alloy | titanium alloy Ti-6Al-4V | electrical discharge machining | WEDM

Wire electrical discharge machining (WEDM) cuts material using the principles of electroerosion, which conclusively defines the resulting morphology of the machined surface. During the erosion process, removal of tiny particles of material (tiny globules) is achieved using a stream of dielectric. On certain surfaces, these tiny globules get stuck during the thermaltreatment and remain on the machined su (…)

NEED FOR SUPPORT STRUCTURES DEPENDING ON OVERHANG SIZE

MILAN DANA, IVANA ZETKOVA, PAVEL HANZL
Keywords: geometry | Overhanging ends | MS1 – 1.2709 | DMLS | 3D Print

This paper is focused on 3D printing of metal parts and the limitations of this method. There are numerous methods currently used for 3D printing, for example, DMLS, SLS, CLADDING, etc. This paper is limited to 3D printing using DMLS (Direct Metal Laser Sintering). The method works with metal powder, which is applied to a building platform in thin layers. The shape of a part is sintered using a laser be (…)

EVALUATION OF S-PARAMETERS ON THE SURFACE OF TITANIUM ALLOY TI-6AL-4V AND AL99.5 MACHINED BY WEDM

KATERINA MOURALOVA, JIRI KOVAR, PETRA SLIWKOVA
Keywords: S-parameters | aluminium Al 99.5 | titanium alloy Ti-6Al-4V | electrical discharge machining | WEDM

Efficient machining using the technology of wire electrical discharge machining (WEDM) is a compromise between cutting speed and surface quality. Typical morphology of WEDM processed surface features plenty of craters caused by electrospark discharges produced during the cutting process. The study deals with the evaluation of S-parameters enabling quantitative evaluation of the surface in all directions (…)

ANALYSIS OF FREQUENCY CHARACTERISTICS AT SPINDLE OF CNC MACHINING CENTRE

ANDREA CIZIKOVA, KATARINA MONKOVA, PETER MONKA, MAREK URBAN
Keywords: analysis | Machining | frequency characteristics | amplitude | frequency

The paper deals with an analysis of frequency characteristics scanned at the spindle of CNC machining centre Pinnacle PKVMC650S.It also points on the early diagnostics necessity of possible sources of unwanted vibrations to predict the behaviour of devices, to find out the life of devices and to improve the quality of machined surface. The method of the planned experiment was used as the research metho (…)

GEOMETRIC ERRORS COMPENSATION OF CNC MACHINE TOOL

MICHAL HOLUB, PETR BLECHA, FRANTISEK BRADAC, TOMAS MAREK, ZDENEK ZAK
Keywords: LaserTRACER | ballbar | Laser interferometer | small CNC machine tools | volumetric accuracy | geometric accuracy

This contribution assesses the possibilities of application of conventional compensation technology on a small three-axis vertical machining centre. Small CNC machine tools are intended for manufacture of small workpieces with dimensional accuracy of up to 0.001 mm. To achieve the required accuracy and reproducibility of manufacture, a variety of software compensations are deployed on machines. The aim (…)

COMPARISON OF SELECTIVE LASER MELTING OF 18NI MARAGING STEEL BY PXL AND M2 CUSING

DANIEL KOUTNY, LIBOR PANTELEJEV, JAN TOMES, DAVID PALOUSEK
Keywords: Fractography | mechanical properties | Microstructure | MaragingSteel | selective laser melting

This study compares 18Ni maraging steel processing on two competitive SLM machines, PXL and M2 Cusing. For the production of samples, powder material from original machine supplier was used on each machine separately. Process parameters for the production of small thin-walled parts were set individually on each machine according the recommendation of the device manufacturer. The basic mechanical propert (…)

RELATIONSHIP BETWEEN VALUES OF PROFILE AND AREAL SURFACE TEXTURE PARAMETERS

MATEJ HARCARIK, ROBERT JANKOVYCH
Keywords: regression | tolerances | areal surface texture parameters | surface metrology | surface texture

This paper presents a regression analysis of the relationship between values of profile and areal surface texture parameters extracted from the same surfaces. The problem of tolerancing for areal surface texture evaluation is briefly introduced. Basic concepts of and differences between areal and profile evaluation are discussed. Measurements of 21 samples of diverse origin are used as data for linear r (…)

SURFACE MORPHOLOGY OF IRON-RHODIUM ALLOY AFTER WIRE EDM

KATERINA MOURALOVA, RADIM ZAHRADNICEK, JAN STREJCEK
Keywords: EDX | Analysis of the chemical composition | quality of surface | iron-rhodium alloy | electrical discharge machining | WEDM

The iron-rhodium alloy, having very interesting magnetic properties, is being studied for future use in next-gen data storage methods, for which high-speed information inscription is predicted. The examined material has been made by casting, but a for the purpose of examining its magnetic properties, the need for reducing the size of the sample arose. Because of this, wire electrical discharge machining (…)

VIBRATION AND RELATED DIAGNOSTICS OF MOTORS AND GENERATORS

JAN LIPUS, ROBERT JANKOVYCH, MILOS HAMMER, TADEAS LIPUS
Keywords: condition monitoring | vibrations | diagnostics | machine failures | electric motor

This article is devoted to diagnostics of rotating machines – electric motors and generators. It describes their basic characteristics and failure modes in terms of statistics and experience. The methods of multi-parametric approach to electrical machines diagnostics are listed. The analysis methods based of vibration measurement are emphasized due to the fact that vibration analysis is the best way to (…)

EXPERIMENTAL EVALUATION ON THE QUALITY OF MACHINED SURFACE AFTER TURNING OF MATERIAL INCONEL 625

TOMAS PROKES, KATERINA MOURALOVA, JIRI KOVAR
Keywords: design of experiment | box behnken | surface quality | Inconel 625 | turning

Study relates to machining of toughly-machined metal materials specifically turning of the Inconel 625. There had been planned an experiment to find out the impact of setting the individual parameters of machining(cutting speed, feed rate, depth of cut)onto the quality of machined surface. Such experiment was the type of ‘box behnken’and contained 15 rounds. Following was the evaluation of the machined (…)

INFLUENCE OF HIGH ENERGY TREATMENT ON WEAR OF EDGES KNIVES OF WOOD-CUTTING TOOL

VADZIM CHAYEUSKI, VALERY ZHYLINSKI, ALEXANDER GRISHKEVICH, PAVEL RUDAK, STEFAN BARCIK
Keywords: wear | blade | knives | milling tool | coating

PVD, combined electroplating and PVD methods were applied to increase wear resistance of the hard alloy cutting elements for woodworking. Laminated chipboards milled by a tool with knives were coated with ZrN, Mo-N, and ZrN-Ni-Co layers.  Abrasive wear of tools blades occurred. The wear intensity of the knife blades with deposited coatings was reduced. The value of volume wear of knife blades with coati (…)

CHEMICAL RESISTANCE OF MATERIALS USED IN ADDITIVE MANUFACTURING

JIRI SAFKA, MICHAL ACKERMANN, DAVID MARTIS
Keywords: tensile test | polymers | polyJet matrix | fused deposition modelling

This article deals with the mechanical testing of polymeric materials processed using 3D printing and exposed to different chemical compounds. Information on this resistance is very important for the user from the point of view of the multidisciplinary use of prototypes of 3D printers for various applications. Materials used for these purposes are processed using the photopolymer processing technology P (…)