Modern Machinery (MM) Science Journal, December 2018

FREE DIRECTIONAL ROBOTIC DEPOSITION - INFLUENCE ON OVERHANG PRINTABILITY

PETR KREJCIRIK, DAVID SKAROUPKA, DAVID PALOUSEK
Keywords: Grasshopper | KUKA PRC | spiral vase | PLA | FFF | fused filament fabrication | robotic 3D printing | 6-axis 3D printing | 3D printing strategy

This article deals with a 3D printing strategy to reduce supports in the case of overhang geometry on 3D printed models realized by Fused Filament Fabrication (FFF). Experiments were performed to compare the conventional FFF process (normal orientation to the platform) with a novel strategy of 3D printing using 6-axis degrees of freedom to orient the nozzle close to the tangent direction of the 3D print (…)

METHOD OF DESCRIBING THE HEAT EXCHANGER PERFORMANCE

JAN KOLINSKY
Keywords: evaluation | heat transfer | power performance | heat exchanger

The paper deals with the method of description of heat exchanger performance. The power of the heat exchanger is usually dependent on the flow rate of the warmer and the flow rate of the colder medium and on the temperature difference of these media at the input. The power of heat exchanger is not a just a value. It is a function of these variables. Different types and designs of heat exchangers have a (…)

RELATIVE ELECTRODE WEAR AT EDM OF TOOL STEEL

LUBOSLAV STRAKA, GABRIEL DITTRICH
Keywords: tool steel | Main Technological Parameters (MTP) | Material Removal Rate (MRR) | Relative Electrode Wear (REW) | Electrical Discharge Machining (EDM)

The technology of electroerosive machining with a shaped tool electrode utilizes thermal energy when removing the material. It results from the continuous repetitive electrical discharges of high intensity between the workpiece and a tool electrode in the presence of a dielectric fluid. The gradual removal (erosion) of metal particles occurs both from the workpiece and the tool electrode, in response to (…)

INVESTIGATION OF AN ELEVATOR DISPATCHER SYSTEM

JAMIL AHMAD, MUHAMMAD LATIF, PETR HOREJSI
Keywords: most different destinations | shortest travel distance | sequence dispatcher | witness | Simulation | Elevator Dispatcher System

To provide an efficient elevator system, a variety of diverse and sometimes conflicting constraints have to be solved. This paper focuses on using discrete event simulation as a means to model and explore elevator dispatching strategies. Witness simulation software has been used as a test-bed for model building, simulation and some experimentation. Model building using Witness model elements is describe (…)

CONCEPT OF OPTIMIZATION AND DESIGN OF A TESTING DEVICE FOR TESTING SEPARATING GRILLES

NAQIB DANESHJO, MILAN MAJERNIK, ERIKA DUDAS PAJERSKA, MIRWAJS DANISHJOO
Keywords: structural 3D modellers | Simulation | CAD/CAM | principle of testing | separating grilles | force sediment separator | testing device

The paper deals with a basic design of testing device for testing of separating grilles. It describes a physical principle of particle separation using this grille. It deals with a basic physical-design solution of this device. The device simulates environmental conditions while driving a vehicle and provides a customer with data on separation efficiency of the tested grille. Principally, similar tests (…)

A SUBSTRUCTURING APPROACH FOR SIMULATION OF TIME DEPENDENT WORKPIECE DYNAMICS DURING MILLING

CHRISTIAN BRECHER, PRATEEK CHAVAN, ROBERT SPIERLING, MARCEL FEY
Keywords: milling | physical domain | dynamics substructuring | workpiece dynamics

During milling, the process forces and poor dynamics of the machine may lead to undesirable vibrations between workpiece and tool. The magnitude of these vibrations and the chatter tendencydepends mainlyuponthe dynamic properties of the Tool-Machine-Workpiece system. The dynamic properties of the workpiece can vary significantly during the cutting process, while removing a large volume from a workpiece. (…)

CONSIDER THE STRENGTH ASPECTS OF THE MATERIAL SELECTION FOR THE PRODUCTION OF PLASTIC COMPONENTS USING THE FDM METHOD

"ANTON PANDA, LUDMILA NOVAKOVA-MARCINCINOVA, EMA NOVAKOVA-MARCINCINOVA, JAN DUPLA, TADEUSZ ZABOROWSKI"
Keywords: fused deposition modelling | PLA eco-materials | rapid prototyping | 3D model | PLA –PolyLacticAcid

The authors in their article are devoted to describe the samples production of sophisticated eco-material PLA -PolyLacticAcid extruded horizontally in length, produced by FDM method, Rapid Prototyping. Carried out experimental tests of mechanical properties are presented by the authors in this article. Also in this article eco-materials outputs tested are presented in patterns, measurement protocols rec (…)

THE EFFECT OF RECYCLING POWDER STEEL ON POROSITY AND SURFACE ROUGHNESS OF SLM PARTS

JAN SUKAL, DAVID PALOUSEK, DANIEL KOUTNY
Keywords: martensitic steel | 18Ni 300 | 1.2709 | porosity | powder recycling | selective laser melting | SLM

The paper deals with the influence of the recycling of 1.2709 powder steel on porosity of the components produced by selective laser melting technology (SLM). One of the main requirements for the parts produced by SLM is to achieve good mechanical properties. The presence of pores, typical defects in the SLM produced material, is one of the causes of the mechanical properties reduction. In particular, t (…)

MODIFICATIONS TO THE EFFECTOR FOR MEASUREMENT OF GRIPPING FORCE

JIRI SUDER, MILAN MIHOLA, ZDENEK KONECNY, TOMAS KOT, ROBERT PASTOR
Keywords: stress analysis | manipulator arm | straingauge | effector | measurement of gripping force

The article describes modifications to the effector of a manipulator arm proposed in order to increase the accuracy of jaw force measurements. Gripping force measurement is performed using strain gauges. Their proper positioning and connection minimize not only the influence of the position of the centre of gravity of the manipulation object on the jaws but also the effect of temperature changes around (…)

THE INFLUENCE OF HUMIDITY AND TEMPERATURE ON THE PROPERTIES OF PHOTOPOLYMER MATERIALS MADE BY POLYJET TECHNOLOGY

LUBOŠ BĚHÁLEK, JIŘÍ ŠAFKA, MARTIN SEIDL, MARTIN BORŮVKA
Keywords: mechanical properties | 3D Print | photopolymers | PolyJet

The paper is focused on the study of environmental changes and their impact on selected mechanical properties of parts made of photopolymer materials used by the PolyJet technology. Discussion deals with changes in material properties of parts exposed to increased temperature and humidity. Different layer orientations during 3D printing of parts was another evaluating aspect that influenced the final me (…)

USE OF DIFFERENT SIMULATION METHODS FOR DESIGN OF EXPERIMENTAL ROVER

ROBERT PASTOR, ALES VYSOCKY, PETR SIROKY, ZDENEK KONECNY, LADISLAV KARNIK
Keywords: FEM analysis | suspension system | Kinematics | Simulation | rover

In this study results of various simulation methods are evaluated used for design of experimental prototype rover. The proposed rover must satisfy requirements for operation in specific conditions. Simulation environment of V-REP software is used for verification of proper functionality of kinematics of the rover and for the draft of fundamental parameters. Deformation of beams are simulated in the Stru (…)

FUSED DEPOSITION MODELLING VS. INJECTION MOULDING: INFLUENCE OF FIBER ORIENTATION AND LAYER THICKNESS ON THE MECHANICAL PROPERTIES

LUBOŠ BĚHÁLEK, JIŘÍ ŠAFKA, MARTIN SEIDL, JIŘÍ HABR, JIŘÍ BOBEK
Keywords: polycarbonate | polymer blend | Acrylonitrile-butadiene-styrene copolymer | injection moulding | fused deposition modelling

The paper deals with comparison of tensile, flexural and impact characteristics of parts produced by injection moulding technology and Fused Deposition Modeling (FDM). The influences of various layers’ thicknesses and their orientation on the final mechanical properties of printed parts were also among the evaluated factors. ABS and PC / ABS materials were selected for the study and the analysis of the (…)

INNOVATIVE BROAD-SPECTRUM TESTING AND MONITORING OF BELT TRANSMISSIONS

JOZEF MASCENIK, SLAVKO PAVLENKO
Keywords: stand | diagnostics | motor | tension | belt gear

The aim of this paper is to present the possibilities of testing and monitoring of belt conveyances, as well as the possibility of determining the limit states by extreme loads. The newly wrapped strap allows for extreme stresses to determine the deformation point of the belt itself. The design of the wall was based on the basic technological and constructional knowledge gained from the professional lit (…)

SORPTION OF NICKEL CATIONS FROM THE WATER ENVIRONMENT ON THE CLINOPTILOLITE

IVETA PANDOVA
Keywords: wastewater | kinetic | isotherm | sorption | nickel | clinoptilolite

One of the world's biggest problems is the lack of drinking water. The most effective methods are sought for water treatment. The latest methods include sorption on the solid layer. In order to design the arrangement of the cleaning process, it is necessary to know the adsorption isotherm and the kinetic course of sorption. The article contains laboratory experiments designed to determine the sorption p (…)

EFFECTIVE UTILIZATION OF USED DEPOSITION MODELING TECHNOLOGY

EMA NOVAKOVA-MARCINCINOVA, ANTON PANDA, LUDMILA NOVAKOVA-MARCINCINOVA
Keywords: materials for rapid prototyping | fused deposition modeling | rapid prototyping

This paper deals with basic knowledge and problems in area of Fused Deposition Modelling (FDM) technology operation focused on used material testing and operation optimization from economical aspects of view. It belongs to progressive methods of model creation based on geometry obtained from CAD environment with application possibilities in different industrial spheres.

INFLUENCE OF DIE CASTING FACTORS AND OF HARDENING TEMPERATURE UPON MECHANICAL PROPERTIES OF A DIE CAST

STEFAN GASPAR, TOMAS CORANIC, JAN PASKO
Keywords: mechanical properties | hardening temperature | technological factors | die cast

In case of production of die casts utilizable especially in expansively growing automotive industry, the particular attention is devoted to a goal-oriented increase of commercial and utility properties of a product in with acceptable economical costs. In the experimental part of the submitted paper the influence of technological factors of die casting and of hardening temperature upon mechanical propert (…)

INTRODUCTORY ANALYSIS OF GAS CONSUMPTION TIME SERIES IN NON-RESIDENTIAL BUILDINGS FOR PREDICTION PURPOSES USING WAVELET DECOMPOSITION

ALEXANDER HOSOVSKY, JAN PITEL, JANA MIZAKOVA, KAMIL ZIDEK
Keywords: temperature | frequency spectrum | gas consumption | cyclic component | wavelet analysis

Gas consumption prediction in buildings is very important with regard to the improved decision making and better energy utilization rate. Our objective is to perform introductory analysis of gas consumption time series in three different types of non-residential buildings (elementary school, national health institute and railway station) using wavelet transform intended for prediction model identificati (…)

SIMULATION MODEL OF POLYCARBONATE MATERIAL FOR ADDITIVE TECHNOLOGY FDM

JAN LIPINA, VACLAV KRYS, PAVEL MEC
Keywords: simulation model | shear tests | tensile tests | bend tests | polycarbonate | rapid prototyping

The Department of Robotics at the VSB-TU Ostrava has been long-term involved in the improvement of parameters in parts produced by additive technology. It primarily concerns component parts as well as bigger functional units of mobile robots. However, it is not exceptional to produce a complete bearing frame of a mobile robot or an effector with the majority of parts produced by additive technology. Thi (…)

PARAMETRIC MODELING AS EFFICIENT WAY OF DESIGNING

ANNA SMERINGAIOVA, MAREK WITTNER
Keywords: technical documentation | CAD software | parameterization | computer modeling | digital manufacturing

In this article, the principle of parametric modeling as an efficient way of designing and processing technical documentation is described on the example of creating a specific parametric model.

OPTIMAL PREVENTIVE MAINTENANCE SCHEDULE OF SLEWING RINGS FOR DEMANDING PRODUCTION MACHINE

LUBOSLAV STRAKA, ANTON PANDA
Keywords: diagnostic signal | slewing rings | probability | preventive maintenance | experimental equipment

When designing any demanding production machine should be chosen minimum necessary set of technical components that are necessary to the achievement of the required functions. Moreover, the quality of fulfilling the functions is closely related to its reliability. One of the basic ways of improving the reliability of technical components of demanding production machines is increasing their reliability t (…)

POLYMER CAVITY MADE BY FREEFORMER® 3D PRINTER: AN INFLUENCE ON INJECTION MOULDED PARTS

MARTINA CESKOVA, PETR LENFELD
Keywords: polymer inserts | Arburg Freeformer® | additive manufacturing | prototyping | injection moulding

Injection moulding is a major technology in mass production of high quality plastic and composite parts. On the other hand, additive technology is suitable for prototyping, but produced parts do not reach as high mechanical properties as injection moulded parts do. Main advantage of additive technologies is production without expensive injection moulds. Polymer injection mould cavity inserts made by an (…)

THE DESIGN CRITERIA FOR BIODEGRADABLE MAGNESIUM ALLOY IMPLANTS

"SUKHODUB LEONID, PANDA ANTON, DYADYURA KOSTIANTYN, PANDOVA IVETA, KRENICKY TIBOR"
Keywords: manufacturing processes | orthopaedics | biomaterials | mechanical integrity | biocompatibility | magnesium composite | magnesium alloys | design criteria

Magnesium (Mg) and its alloys posse’s great potential for the application of biodegradable medical implants.  However, the extensive applications of Mg-based alloys are still inhibited mainly by their high degradation rates and consequent loss in mechanical integrity. Using suitable alloying elements mechanical strength and corrosion resistance of Mg-alloys can be enhanced but cytotoxicity and long term (…)

PLANNING MANUFACTURING PROCESSES OF SURFACE FORMING WITHIN INDUSTRY 4.0

JAN KMEC, MONIKA KARKOVA, JAN MAJERNIK
Keywords: methods and structure of operations | industry 4.0 | Production Process

The article explores essential prerequisites and effects for automated processes of surface forming in planning manufacturing processes within Industry 4.0. Based on authors’ practical experience and profound knowledge, they describe the adequate use of industrial robots and handlers for automated manufacturing processes. They in depth analyse methods and structures of handling operations and their appl (…)

THE TECHNIQUE FOR DETERMINING THE MOTION OF ROBOT MANIPULATOR MODEL ELEMENTS

Anton Panda, Eduard Kuznetsov, Volodymyr Nahornyi
Keywords: software | movable link | nodal points | coordinates | positioning | trajectory | Robot

The technology of creating a motion mathematical model of an industrial robot manipulator has been proposed. Objective of the presented work is to study the motion features of industrial robot elements. The work result is a robot's computer model, which analyzes the movement elements of product moving parts. For this purpose, a special technique of calculating the dimensional constraints of robot's ele (…)

THE CARRYING CAPACITY OF TiCN COATING ON CONVEX-CONCAVE (C-C) GEARINGS

ERNEST GONDAR, MIROSLAV BOSANSKY, JANA REPKOVA, FRANTISEK TOTH
Keywords: biogearfrom | Niemann´s test | Hardness | adhesion | wear | Friction Coefficient | TiCN coating | convex-concave gearing

This paper discusses the possibility of increasing the surface load capacity in C60E steel gearings by applying selected thin coatings. It describes the effect of tribological characteristics, such as friction coefficient, wear, adhesion and hardness of  TiCN coating on convex-concave gearing (C-C).  The average thickness of  TiCN  is 3.3µm. Delamination of the TiCN coating was recorded at a load of app (…)

PROCESSING AND VISUALIZATION OF MICROCLIMATIC DATA BY USING VIRTUAL REALITY

JIRI KROUPA, ELISKA TUMOVA, ZDENEK TUMA, JIRI KOVAR, VLADISLAV SINGULE
Keywords: microclimatic data | visualization | database system | virtual environment | Virtual Reality

The appropriate way of measured data visualization is an important factor which has a significant impact to its quality as well as to the speed of the data analysis. Especially when the analysis is carried out by a multidisciplinary team. The virtual reality is one of the techniques used for data visualization. It is progressive technology which enables better and faster understanding to visualized data (…)

APPLICATION OF A BALLBAR FOR DIAGNOSTICS OF CNC MACHINE TOOLS

MICHAL HOLUB, FRANTISEK BRADAC, ZDENEK POKORNY, ADAM JELINEK
Keywords: geometric accuracy | diagnostic | machinetool

This paper describes the possibilities of using the Ballbar QC20-W diagnostic tool for long-term monitoring of geometrical accuracy of CNC machine tools. By introducing regular checks, the production capability and the planned machine maintenance should be increased. The publication presents the results obtained from a case study. The case study describes the procedures and results of introducing a regu (…)