MM Science Journal, October 2021

October 2021

INCREASING OF WEAR RESISTANCE OF LINEAR BLOCK-POLYURETHANES BY THERMAL PROCESSING METHODS

ANTON PANDA, VOLODYMYR MYKOLAJOVYCH ANISIMOV, VOLODYMYR VOLODYMYROVYCH ANISIMOV, KONSTANTIN DYADYURA, IVETA PANDOVA
Keywords: linear block-polyurethane | friction in water | thermal processing | wear resistance | coefficient of friction

A significant imperfection of parts made from linear blockpolyurethanes under conditions of friction contact in the presence of water medium is an intensification of hydrolysis processes and reduction of bulk strength. In order to slow down the hydrolysis process, samples of the polyurethanes were subjected to three types of thermal impacts: thermal processing during some time, infrared and laser irr (…)

INFLUENCE OF NONMETALLIC INCLUSIONS ON THE CORROSION RESISTANCE OF STAINLESS STEELS IN ARC SURFACING

IVETA PANDOVA, VALERY MAKARENKO, PAVLO MITROFANOV, KOSTIANTYN DYADYURA, LIUDMYLA HREBENYK
Keywords: arc surfacing | stationary and pulsed surfacing | stainless steels | non-metallic inclusions | corrosion resistance

The influence of non-metallic inclusions on the corrosion resistance of stainless steel of the austenitic-martensitic class, deposited in one layer with flux-cored wire under the flux by the arc method in the mode of stationary and pulsed arc burning, has been studied. In the latter case, the wire feed impulse was 0.5 and 0.7 Hz. The selected surfacing conditions, with both methods of the process, contr (…)

DIMENSION REDUCTION USING THE INVERSE STAMPING METHOD

JAROMIR KASPAR, MARCEL SVAGR, PETR BERNARDIN, VACLAVA LASOVA, OTOMAR SEDIVY
Keywords: Inverse stamping | finite element method | graph theory | stochastic method | dimensional reduction

The aim of this work is to improve the inverse stamping methodand increase its robustness. The first, crucial step of inverse stamping is the reduction of the three-dimensional part into a two-dimensional flat plane. There are several methods for reducing the dimension. These are geometrical methods, methods based on graph theory and stochastic methods. We examine the last two methods because of th (…)

EFFICIENT DETERMINATION OF STABILITY LOBE DIAGRAMS DEPLOYING AN AUTOMATED, DATA-BASED ONLINE NC PROGRAM ADAPTION

CHRISTIAN BRECHER, RALPH KLIMASCHKA, ALEXANDER STEINERT, STEPHAN NEUS
Keywords: Stability lobe diagrams | regenerative chatter | online chatter detection | Poincaré section

Process instabilities due to regenerative chatter pose significant limitations on the achievable material removal rates and thus on the profitability of machining operations. Stability lobe diagrams serve to exploit the maximum yet stable cutting depth and can be determined either analytically or experimentally. While analytical approaches suffer from inaccuracies because of the assumptions made for the (…)

DEVICE FOR MONITORING THE INFLUENCE OF ENVIRONMENTAL WORK CONDITIONS ON HUMAN FACTOR

DANIELA ONOFREJOVA, JAROSLAVA KADAROVA, JAROSLAVA JANEKOVA
Keywords: digital factory | digital production | human factor | safe and healthy working environment | productivity.

Industry 5.0 follows the idea of continuous digitization and transfer to digital factory. Industries must adopt the green and digital transitions to continue to be competitive. Besides the preservation of resources, climate change, the social stability is in the focus. Industries strive to become more resilient against external disturbances, such as Covid-19 crisis. Work environment considerably a (…)

RESEARCH AND DIAGNOSTICS FOR THE LABORATORY OF PRESSURE RESISTANT SENSORS

ROMAN ZELNIK, ADRIANA KAMENSZKA, PAVOL BOZEK
Keywords: sensor | diagnostics | calibration | parameters | control algorithm

The use of the sensors shortens the service life, wears out and reduces their accuracy due to operation. For sensors with a susceptibility to inaccuracy, it is possible to create a sensor-device-software diagnostic set. Such a scheme of configuration should be able to provide autonomic diagnostic, calibration, evaluation and also recalibration of the sensor. The diagnostic equipment could also hav (…)

DC MOTOR FUZZY MODEL BASED OPTIMAL CONTROLLER

DANIELA PERDUKOVA, PAVOL FEDOR, MILAN LACKO
Keywords: DC motor | fuzzy systems | black-box fuzzy model | optimal fuzzy control | HIL platform

This paper presents a method for the design of optimal fuzzy controller of a DC motor using a fuzzy model based approach with emphasis on minimal knowledge on the controlled system. In the first part of the paper we describe the method of the black-box fuzzy model design based only on the system´s measured input/output data without the necessity of preliminary knowledge of its internal structure a (…)

OPTIMIZATION OF THE UNIVERSAL ROTARY MODULE URM THROUGH ADDITIVE MANUFACTURING OF COMPOSITE MATERIALS

LUKAS HRIVNIAK, JOZEF SVETLIK, MICHAL SASALA, STEFAN ONDOCKO
Keywords: Modular robotics | universal rotary module | weight optimization | additive technology | composite | carbon fibres

The article deals with the ongoing development of the universal rotary module URM 02. The high weight of the components from which the modules are assembled proved to be a significant problem. As well as the weight of the connecting parts that are needed to assemble the manipulator or robotic arm. Design changes have resulted in a reduction in weight compared to older generations of modules, but in (…)

MAXIMIZING THE PROFITABILITY ON INVESTMENT BY OPTIMIZING THE PRODUCTION PROGRAM

JAROSLAVA KADAROVA, JAROSLAVA JANEKOVA, DANIELA ONOFREJOVA
Keywords: Investment | investment decision-making | risk analysis | Net Present Value | production program

Investments in tangible fixed assets significantly affect the future production capacity of the company, they are a stimulator of the company's development. At the same time, they are associated with a degree of uncertainty that needs to be taken into account when making investment decisions. The article presents an approach to optimizing inhomogeneous production in order to maximize the economic effici (…)

QUALIMETRIC METHOD OF ASSESSING RISKS OF LOW QUALITY PRODUCTS

ROMAN TRISHCH, OLESIA NECHUIVITER, KOSTIANTYN DYADYURA, OLEKSANDR VASILEVSKYI, IRYNA TSYKHANOVSKA, MAKSYM YAKOVLEV
Keywords: qualimetry | risk assessment | risk of low quality | summarizing indicator | multicriteria quality assessment | dimensionless scale.

Risk assessment is an integral part of an enterprise's quality management system. The risk of low quality products is the most significant risk, as it is directly related to the concept of enterprise competitiveness. The paper analyzes the scientific papers related to the assessment of the quality of products, processes and services, their disadvantages, possible limits of application. It is proposed to (…)

INFLUENCE OF PROCESS PARAMETERS IN FRICTION DRILLING OF TITANIUM TI-6AL-4V ALLOY

THONGCHAI PANGJUNDEE, APIWAT MUTTAMARA
Keywords: Friction drilling | Titanium Ti-6Al-4V | Thrust force | Torque force | Hardness

Friction drilling is a process of using the friction between the rotating conical tool and the workpiece to generate heat and deform the work piece’s material and penetrate the hole. The softened material is pushed sideward and downward to make the bushing. This paper aimed to study the influence of friction drilling parameters. Thrust forces and torque forces were analysed. Experiments were carried out (…)

EVALUATION OF PHYSICAL BURDENS OF OPERATORS USING ERGONOMICS

PETRA MARKOVA, VANESSA PRAJOVA
Keywords: work | work activity | load | difficulties | Ergonomics | work performance | employee

The article describes the experience from assessing the load of the upper limbs during the horning operation, which is one of the more difficult manual manipulations. Several analytical methods were used to obtain complex analytical data. They were used to identify deficiencies in work activity causing loading of the upper limbs, which in the form of increased effort affect employees' work performan (…)

EFFECTS OF DIFFERENT EXCITATION MECHANISMS IN MACHINE TOOLS WHEN PERFORMING OUTPUT-ONLY MODAL ANALYSIS

JAN BERTHOLD, MARTIN KOLOUCH, JOACHIM REGEL, MARTIN DIX
Keywords: Output-only Modal Analysis | Machine tool | dynamic behaviour | excitation mechanism | white noise

Output-only Modal Analysis makes it possible to investigate the dynamic behaviour of machine tools, especially under process conditions. The differences between standstill and process state, which are important to be considered, result from process damping, gyroscopic moments of the rotating spindle, and changes in preloads and clearance in bearing and joints. Output-only Modal Analysis assumes a comple (…)

OPTIMIZATION OF THE FORMING PROCESS OF GUTTER END CAP USING THE FINITE ELEMENT METHOD

PETER MULIDRAN, EMIL SPISAK, JANKA MAJERNIKOVA, GERHARD MITAL, TOMAS JEZNY
Keywords: forming | FE analysis | numerical simulation | anisotropy

The contribution deals with the optimization of the forming process with the use of FE analysis. The impact of the planar anisotropy and friction coefficient on the drawing process was evaluated in the numerical simulation. Optimization of metal blank size and shape with the use of metal forming simulation was also performed. Studied material was galvanized drawing quality steel which is used for (…)

MANUFACTURING OF SANDWICH PANELS AND ITS VERIFICATION BY NUMERICAL SIMULATION

MARTIN HARANT, JAN RIHACEK, LIBOR MRNA
Keywords: hydroforming | numerical simulation | PAM-Stamp | DC01 steel | anisotropy | forming limit diagrams

This paper deals with the manufacturing of a parallel hydroformed sandwich panel, which is used as a reinforcement for solar panels. The forming process can cause excessive thinning and cracking. Therefore, PAM-STAMP software is used for the analysis of defects. The outputs of the numerical simulation provide information, such as failure pressure, critical areas or limiting deformations. The comparison (…)

APPLICATION OF WC GRAINS BY DEPOSITION BRAZING

MARIAN SIGMUND, JOSEF IZAK
Keywords: WC - wolfram-carbide | WC grain – wolfram-carbide grain | hard deposition brazing | flame brazing | barking knife.

The article describes problems of hard depositional brazing of wolfram-carbide grains in various matrixes. Especially iron and nickel base matrix on base material from constructional carbon steel. The experimental part was brazed by oxyacetylene flame (method 912 according to EN ISO 4063). The major goals of the experiment were to describe the technological procedure of hard depositional brazing of th (…)

VERIFICATION OF FORCE TRANSDUCER FOR DIRECT AND INDIRECT MEASUREMENTS

TATIANA KELEMENOVA, MIROSLAV DOVICA, IVANA KOLARIKOVA, ONDREJ BENEDIK, VLADISLAV MAXIM
Keywords: Force sensor | measurement | calibration | reference standard | verification | uncertainty | measurement error

Paper deals with verification of high load force sensor using the small weight weights. Test band was built for this purpose. Verification of test band were executed using the etalon reference sensor. Small forces were executed via using the direct method through the applying of weights. High forces were executed using the indirect method through the lever amplification of load derived from small weig (…)

IDENTIFICATION OF CHARACTER AND INTENSITY OF WEAR OF PVD COATED TWIST DRILLS IN DRILLING OF C 45 MATERIAL

MARIAN HARSANI, MATEJ MIKLOS, IVAN MORGOS
Keywords: hard coatings | PVD technology | drills | flank wear | C45

This article is aimed to investigation of four different PVD coatings of STATON company in order to determine a wear behavior on twist drills when drilling C45 material. A pearliteferrite structure of C45 material is common material for automotive industry and highly abrasive to cutting tools. Our comparative study is focused on flank wear of the cutting wedge of observed drills deposited at STATON. (…)

EFFECTS OF INJECTION SPEED ON MECHANICAL PROPERTIES IN HIGH-PRESSURE DIE CASTING OF MG-RE ALLOY

YUKI KASHIWABARA, MOHD DANIAL IBRAHIM, LIDYANA BINTI ROSLAN, HITOSHI WATANABE, YUTA SUNAMI
Keywords: high-pressure die casting | magnesium alloy | Simulation | x-ray computed tomography | tensile tests | Vickers hardness tests | Microstructure

In this study, in order to clarify the unknown physical properties of the Mg-Al-Th-RE alloy, the relationship between the injection conditions and the internal porosities and the mechanical properties exerted by the solidification microstructure were investigated. The obtained cast samples were investigated using X-ray CT internal measurements, tensile tests, Vickers hardness tests and solidification mi (…)

HEAD ON HALL EFFECT SENSOR ARRANGEMENT FOR DISPLACEMENT MEASUREMENT

MICHAL KELEMEN, TATIANA KELEMENOVA, MARTIN VARGA, PETER JAN SINCAK, LUKAS LESTACH, ELENA SERGEEVNA BAYMETOVA, MARIA RAVILEVNA KOROLEVA, ALENA ALEKSEEVNA CHERNOVA
Keywords: Hall effect sensor | permanent magnet | measurement | uncertainty

Hall effect sensor is a very frequently used sensor in mechatronic products. There is little information in the catalogue sheets about the application possibilities of this type of sensor. This article examines the configuration options of this sensor and how to use it to achieve the best measurement uncertainty and minimal hysteresis.

AUTOMATION OF THE DESIGN OF THE CROSS-SECTION OF THE MANIPULATOR ARMS PROFILE

MILAN MIHOLA, ZDENEK ZEMAN, DAVID FOJTIK
Keywords: automation | Robot | cross-section | arm | RobotArmDesign

The design of the arms of industrial robots and manipulators is a demanding process both in terms of expertise and in terms of the time required. For these reasons, algorithms have been created, with the help of which it is possible to design crosssections of individual arms of robots and manipulators not only from the point of view of maximum allowed deflection but also from the point of view of minim (…)

TREND FORECAST FOR SHORT-TERM OF SHOCK-VIBRATION PREDICTION

TIBOR KRENICKY, VOLODYMYR NAHORNY
Keywords: vibration | short-term forecasting | trend | gravitational constant | epicentre | magnitude.

The short-term forecasting of vibration is considered, in which the trend of the gravitational constant is used as the initial data for forecasting. The trend is recorded throughout the entire period of maturation of the vibration at points on the earth's surface far from its epicenter.

OPTIMIZATION OF THE DEVELOPED OUTER SURFACE OF AN INDUSTRIAL OIL COOLER

ELENA SERGEEVNA BAYMETOVA, MARIA RAVILEVNA KOROLEVA, ALENA ALEKSEEVNA CHERNOVA, MICHAL KELEMEN
Keywords: mathematical modelling | conjugate heat exchange problem | optimization problem | oil coolers | cooling system

Heat removal from the working liquid of hydraulic systems requires the use of heat exchange devices - oil coolers with their geometry directly affecting their efficiency. This paper considers the issues of statement and implementation of the numerical experiment to solve the optimization problem for the industrial oil design.

3D EVALUATION OF THE TOPOGRAPHY OF THE SURFACE BY ABRASIVE WATER JET MACHINING TECHNOLOGY

GERHARD MITAL, EMIL SPISAK, PETER MULIDRAN, LUBOS KASCAK, TOMAS JEZNY
Keywords: Contactless | 3D | measure | Laser | profilometry | surface

The article deals with contact and non-contact evaluation of surface roughness created by water jet cutting technology (AWJ). Non-contact surface measurement was performed using an LPM laser profilometer. The values measured by the laser profilometry method were compared with the values measured by the contact method, the Mitutoyo SJ 400 roughness meter. Six samples were produced. Three in stainless (…)

ON THE SIMULATION OF THE FIRST NATURAL FREQUENCY OF A TUNED MASS DISC DAMPER

CHRISTIAN BRECHER, GUIFENG ZHAO, MARCEL FEY
Keywords: finite element method | Simulation | tuned mass disc damper | natural frequency | impact hammer test

The tuned mass disc damper (TMDD) can be applied to avoid chatter of machine tools. The effectiveness of the TMDD depends mostly on the tuning accuracy of the natural frequency. In this paper, three finite element models are presented to simulate the vibrations of the TMDDs. The simulated natural frequencies are compared with measured results. The third model solves the problems of the first and the sec (…)

SIMPLE EVOLUTIONARY STRUCTURAL OPTIMIZATION FOR MULTIPLE MATERIALS

JAROSLAV ROJICEK, DAGMAR LICKOVA
Keywords: FEA | ESO | Multiple materials | von Mises stress | Soft kill deactivation

An evolutionary procedure for multiple materials is presented. A material is selected due to an allowable stress interval for the material. The presented method includes a mesh-independent filter. The proposed algorithm is applied to three examples with four or five materials. In the presented examples, the effect of an evolution rate, a filter setting, and the number of elements,are shown in a simplifi (…)

USE OF VIBRODIAGNOSTICS TO PREDICT PHENOMENA IN SERIAL AUTOMOTIVE PRODUCTION

ANTON PANDA, SAMUEL CEHELSKY
Keywords: vibrodiagnostics | Fourier transformation | DFT | FFT

The paper discusses the use of vibrodiagnostics in automotive production. Describes the Fast Fourier Transformation and its importance in evaluating the measured values. It focuses on the process of honing the toothing of shafts used in series-produced gearboxes. Describes 3 different states of amplitude with consideration to the set limit. In the first state, all production criteria are met. In the (…)

RATIONALIZATION OF PRODUCTION OF SHAPED INSERTS FOR ROTOR CASTING

PAVEL DOSTAL, MAREK SADILEK
Keywords: Rationalization | die casting | shaped inserts | casting | milling

The article deals with the rationalization of the production of shaped inserts for casting rotors. The theoretical part describes the characteristics of shaped inserts for rotor casting, die casting technology, analysis of the existing technology of production of shaped inserts. The main part of the article is focused on the proposed technological process of production, comparison of existing and (…)

COMPARISON OF PREPARATION METHODS IN TERMS OF TOOL LIFE AND SURFACE ROUGHNESS

ROBERT STRAKA, JOZEF PETERKA, TOMAS VOPAT
Keywords: cutting edge | Preparation | surface roughness | tool life | Tool Wear | turning

The article compares two cutting edge preparation methods and their influence on the machined surface roughness of the difficult to cut nickel alloy Inconel 718 and the tool wear of cutting inserts made of cemented carbide. The manufacturing and preparation process of cutting inserts used in the experiment were made by Dormer Pramet. The preparation methods used in the experiment were drag finishing (…)

LONG RANGE IOT COMMUNICATION

ALENA GALAJDOVA, ROBERT RAKAY
Keywords: Long range | wireless communication | micro system | microcontroller.

The article deals with the design of wireless automation system. The proposed systems compare wireless data transmission devices. The main components and their parameters, which are necessary for building such system and base steps how to create and test a device are described. The created systems can serve as a suitable basis for remote monitoring and control systems in open space applications such a (…)

THE BENEFITS OF INFORMATION SYSTEMS IN THE MANAGEMENT OF INDUSTRIAL ENTERPRISES

VANESSA PRAJOVA, PETER KOSTAL , STANISLAW LEGUTKO, STEFAN VACLAV
Keywords: Enterprise Architecture | business processes | information technology | identification

The ability to make good decisions on the deployment and use of information and communication technologies has become part of successful governance. The convergence of information, communication and multimedia technologies has created new business opportunities that will play a vital role in the economy and public life over the coming decades. On enterprises development in recent years has been dramatic (…)

METHODOLOGY FOR THE UTILIZATION OF WASTE HEAT BY AIR-COOLED COMPRESSORS

LUKAS PACAS
Keywords: compressor | air cooling | waste heat | heat utilization | cost savings

Compressed air is still a valid helper in many applications today, where it is necessary, for example, to move work equipment, pistons or it is used for cooling as a cooling medium. The producer of compressed air are air compressors, which need an external source for its production, usually an electric or internal combustion engine. Almost all the energy that is supplied to the compressor is always conv (…)

EVALUATION OF TRIBOLOGICAL CHARACTERISTICS OF MATERIAL PREPARED BY DMLS TECHNOLOGY

VLADIMIR SIMKULET, DARINA DUPLAKOVA, ALEXANDRA KOVALCIKOVA, MICHAL HATALA, FRANTISEK BOTKO, ZUZANA MITALOVA, RADOSLAV VANDZURA
Keywords: Laser | sintering | powder | maraging | Friction

The method of producing molten metal powder according to the European laser sintering system (EOSINT) was used to prepare the experimental material. The used powder metal material was designated EOS Maraging Steel - MS1. It is a steel powder, which is optimized especially for processing in EOSINT M 280 systems. The measurement of tribological characteristics of prepared materials was performed using the (…)

KINEMATICS OF TWO LINK MANIPULATOR IN MATLAB/SIMULINK AND MSC ADAMS/VIEW SOFTWARE

DARINA HRONCOVA, LUBICA MIKOVA, IVAN VIRGALA, ERIK PRADA
Keywords: Matlab | Simulink | computer simulation | Kinematics | symbolic form | matrix method

The paper deals with the kinematic analysis of a manipulator mechanism. The matrix method of kinematic analysis is used for the solution. The robot's mechanism is an open kinematic chain. The vector of position, velocity and acceleration is determined. The problem is solved using Matlab and MSC Adams / View. The Matlab program is used to solve kinematics equations in symbolic form. Computer software red (…)

INFLUENCE OF VIBRATION MAGNITUDE IN MACHINING OF MATERIALS BY TURNING TECHNOLOGY

STEFANIA OLEJAROVA, TIBOR KRENICKY
Keywords: Machined material | turning | spindle speed | vibrations | device status observation | signal processing | piezoelectric accelerometer

The basic task of any prosperous company is to minimize operating costs to a minimum. High-quality maintenance ensures an increase in the operational reliability of the machines. It is important to find a compromise between scheduled maintenance and production process requirements, so resources are spent to optimize the maintenance schedule. This is provided by technical diagnostics, which helps t (…)