MM Science Journal, June 2021

June 2021

REPLACEMENT OF MANUAL GMAW WELDING BY FCAW SEMI-AUTOMATIC WELDING

MARIAN SIGMUND, TADEAS CICHA
Keywords: GMAW - gas metal arc welding | FCAW - flux cored arc welding | metal powder | WPQR – welding procedure qualification report | WPS – welding procedure specification | pWPS – pre-welding procedure specification | positioner | compensator | mounting insert.

The article describes a replacement and benefits between manual gas metal arc welding (GMAW) with solid wire and semi-automatic flux-cored arc welding (FCAW) with metal flux-cored wire for a specific application of a welded steel compensator used for connecting piping systems to form larger units. For the replacement of the technologies and improvement of the welding efficiency and productivity a spec (…)

DESIGN OF ALGORITHMS FOR AUTOMATIC SELECTION OF DRIVE UNITS FOR MECHATRONIC DEVICES

ZDENEK ZEMAN, MILAN MIHOLA, JIRI SUDER
Keywords: drive | design | Automatization | Mechatronic

The design and selection of a suitable drive unit for use in mechatronic systems is a process that can be demanding not only in terms of the time required but also in terms of the demands placed on the knowledge and experience of development workers. The development aimed to create algorithms for the selection of compact electric power units based on data from dynamic analyses of the proposed system, wi (…)

NUMERICAL AND EXPERIMENTAL MODAL ANALYSIS OF A CARBON FIBRE MONOCOQUE

MICHAL SKOVAJSA, ROMAN KROFT, FRANTISEK SEDLACEK
Keywords: modal analysis | Carbon fibre | Monocoque | Experimental measurement.

This paper deals with the comparison of experimental measurements and numerical simulation of the natural frequency and natural shape of a carbon fibre monocoque. This comparison is used to validate the numerical analysis with a real monocoque. Usually, monocoques consist of orthotropic materials like carbon fibre sandwich with a honeycomb core. The monocoque is manufactured by hand from several layers (…)

PYROLYTIC RECOVERY AS A PROSPECTIVE USE OF PLASTIC WASTE MATERIALS

IVETA CABALOVA , JARMILA GEFFERTOVA, TATIANA BUBENIKOVA , JOZEF KRILEK
Keywords: pyrolysis | thermogravimetry | gas chromatography | plastic waste materials | chemical compounds

Prospective use of plastic material components resulting from their pyrolytic recovery is presented in the paper. Selected plastic waste materials (PE, PP, PS) were evaluated using modern analytical method GS-MS after the low-temperature pyrolysis. The low-temperature pyrolysis shows that the sample of PS was well-suited to this application and this recovery is important in the case of all three samples (…)

FORECASTING AN VIBRATION BY MONITORING THE DYNAMICS OF CHANGES ITS PRECURSORS OF VARIOUS PHYSICAL NATURE

VOLODYMYR NAHORNYI, ANTON PANDA, VALENTINO STRASER, IVETA PANDOVA
Keywords: Vibration forecast | solar wind | scientific method | destructive shocks | radio anomalies.

Prediction crosses all fields of Science, being itself the evident manifestation of the Scientific Method. This study addresses the delicate aspect of vibration forecasting, which considers the association and interaction between the variables involved, such as radio anomalies, the proton density of the solar wind preceding strong vibration. The analysis is based on the collection of about 800 data of v (…)

APPLICATION OF SPEED AND SEPARATION MONITORING TECHNIQUE AT AUTOMATED ASSEMBLY PROCESS

MAREK VAGAS, ALENA GALAJDOVA
Keywords: Speed and Separation Monitoring | Robotic System | Assembly Process | Simulation | safety

The realization and implementation of a collaborative robotic system in the automotive industry has many advantages in productivity, product quality, and worker ergonomics, but worker safety aspects play a crucial role in these activities. This paper presents the results of ongoing research into developing an automated workplace for an assembly of industrial limit switches based on the cooperation betwe (…)

QUALITY OPTIMIZATION OF THE MACHINED SURFACE IN TERMS OF ELECTRIC ENERGY CONSUMPTION IN THE WEDM PROCESS

LUBOSLAV STRAKA, PATRIK KUCHTA
Keywords: Electric energy consumption | Main Technological Parameters (MTP) | optimization | progressive technology | surface quality | Wire Electrical Discharge Machining (WEDM).

Current engineering production is characterized by ever-increasing requirements for the final quality of products. But high fabrication productivity is required in many cases as well. Another advantage is, of course, a beneficial economic efficiency of the production process. However, despite the advanced technical level of production and extensive knowledge in the field of electro-erosive machining, in (…)

POWER AND FORCE LIMITING TECHNIQUE AT COLLABORATIVE WORKPLACE

IVAN VIRGALA, ERIK PRADA, MAREK VAGAS
Keywords: PFL Technique | Collaborative Robots | ISO / TS 15066 | Transient Contact | Quasi-Static Contact

Nowadays, the automotive industry still incorporates collaborative robots and their applications into the less traditional processes to automate them. The purpose is to make up for the skill gap, retain skilled staff, attract the younger generation, and increase quality. The paper brings a short overview of the automated collaborative workplace, including the PFL technique description and possibilities. (…)

CONNECTING A VIRTUAL PRODUCTION AND A PLC

JAN KUBR, KONSTANTIN NOVIKOV, PETR HOREJSI, JANA KLEINOVA, DAVID KRAKORA
Keywords: VR | Virtual Reality | PLC | Internet of Things | Work Instructions | Visualisation

This article deals with the implementation of virtual manuals for mass production workplaces in the automotive industry. The aim is to conduct a pilot study as a source for future research and the possibility of connecting virtual instruction manuals to production systems. A system was designed that uses its own software solution for creating instructions, which was connected to a PLC (Programmable Logi (…)

SIMULATION MODELING OF THE CZECH REPUBLIC ECONOMY WITH A DEVELOPMENT FORECASTING

ELENA GRESOVA, JOZEF SVETLIK
Keywords: Development forecasting | gross domestic product | industrial sector | macroeconomic indicator | national economy | simulation modeling

The current uncertain and rapidly changing time requires a thorough analysis of the actual situation and subsequent appropriate decision-making in many areas. This applies to the individual national economies and their particular sectors, as well. Therefore, the topic of development forecasting is becoming even more important nowadays. The presented paper deals with forecasting associated to the further (…)

THE MACHINABILITY OF INC 718 BY CERAMIC INSERTS

MATUS VARHANIK, MIROSLAV PISKA
Keywords: machinability | hard-to-machine materials | Inconel® 718 | turning with SIALON ceramic | cutting forces

The work deals with a machinability of Inconel® 718 construction material (hereafter referred to as “INC 718”). This chromium-nickel alloy has an austenitic structure, which in conjunction with its low thermal conductivity is one of the causes of a worse machinability. The aim of the work was to increase the productivity of the roughing turning process. There are more ways to improve the machinability o (…)

MECHANICAL PROPERTIES OF ALUMINIUM ALLOYS AT HIGH STRAIN RATE

MIROSLAV JOPEK, MILAN FOREJT, MARTIN HARANT
Keywords: Split Hopkinson Bar test | aluminium alloy | EN AW 6082 | high strain rate | dynamic load.

The split Hopkinson's pressure bar test is a part of a group of testing methods used to determine dynamic behavior of various materials in an interval of strain rate from 100 s-1 to 103 s-1. The article describes the practical application of the testing method for aluminum alloy EN AW 6082. This alloy is used for cold-extruded parts (components of car airbags). Since the strain rate of cold forming tech (…)

MODELING OF THE MANUFACTURING SYSTEMS STATE IN THE CONDITIONS OF THE LEAN PRODUCTION

KONSTANTIN DYADYURA, LIUDMYLA HREBENYK, TIBOR KRENICKY, TADEUSZ ZABOROWSKI
Keywords: Lean production | value stream | manufacturing systems | manufacturing process | resource | markov techniques

This article investigates the hierarchy of the manufacturing system, which consists of a set of interrelated processes aimed at converting information, knowledge, energy, materials, and other resources into value for the consumer based on the principles of lean production. Modern manufacturing systems are becoming more and more complex to manage. The problems that need to be solved are associated with a (…)

PRODUCTION OF FIBER AS AN INPUT MATERIAL FOR THE 3D PRINTING PROCESS

MARTIN POLLAK, MAREK KOCISKO, ANNA BASISTOVA, SIMONA HLAVATA
Keywords: 3D printing | FilaFab PRO EX350 | fiber production | filler | admixture | PLA Ingeo 2003D.

Additive manufacturing, also known as 3D printing, is the process of joining organic, ceramic, polymer, metal and others materials. Most often used as input material are the ABS and PLA plastics. A large number of plastic products is constantly generated by industry, which beckons the idea how to manufacture these products in more environmentally friendly way. This paper deals with the possibility of pr (…)

APPLICATION OF AUGMENTED REALITY TOOLS TO THE DESIGN PREPARATION OF PRODUCTION

PETR BARON, MAREK KOCISKO, EDUARD FRANAS
Keywords: Augmented Reality | Unity | Vuforia

The paper describes the application of augmented reality tools to create an auxiliary interactive tool in the field of design. To mediate it, an application with AR operation based on marker tracking has been designed. The created application works with the mobile devices platform. Two types of markers have been used in the application. To display basic information, buttons with functions are added to t (…)

COGENERATION UNIT NOISE REDUCTION BY ITS CASE

RADEK STRAMBERSKY, VACLAV PAVELKA, TOMAS PAWLENKA, PAVEL SURANEK, LESZEK MORZYNSKI
Keywords: Cogeneration unit | noise | acoustic camera | beamforming | noise measurement

This paper deals with cogeneration unit noise measurement by the acoustic camera. Noise is not only measured as the final number of sound power levels, but also its original location is determined with the use of the beamforming algorithm. The properties of the used microphone array are considered and numerically calculated as every different microphone array layout will measure with another resolution. (…)

INFLUENCE OF THE PRESSURE DIE GEOMETRY ON THE BENT TUBE OVALITY

JAN RIHACEK, MICHAELA CISAROVA, EVA PETERKOVA, KAMIL PODANY
Keywords: finite element analysis | numerical simulation | ANSYS | 34MnB5 steel | tube bending

The paper deal with analysis and optimization of the pressure bar geometry in the case of the tube bending. The bending process is realized on Wafios RBV 60 ST CNC bending machine using rotary draw bending system. The processed semi-finished product is a tube, which is made of 24MnB5 steel. Currently, after tube bending by an angle of 120°, an unacceptable ovality occurs on its body. Therefore, the arti (…)

ANALYSIS OF THE INFLUENCE OF TOOL ELECTRODE WEAR ON SURFACE QUALITY IN DIE-SINKING EDM TECHNOLOGY

LUBOSLAV STRAKA, PATRIK KUCHTA
Keywords: Die-sinking Electrical Discharge Machining (Die-sinking EDM) | Main Technological Parameters (MTP) | Percentage Electrode Wear (PEW) | tool steel | Shaped Tool Electrode (STE).

During the electro-erosive process, metal particles are gradually removed not only from the machined material but also from the tool electrode. Here, the removal of material from the tool electrode is generally considered to be an undesirable consequence of the electro-erosive process. The extent of this wear can be relatively accurately quantified using several indicators. Of these, the percentage of l (…)

ANALYZING THE PERFORMANCE OF CIRCLE SEGMENT END MILL WITH PCD INSERTS WITH LASER-MACHINED INTEGRAL CHIPBREAKER WHEN DRY MILLING OF ADDITIVE MANUFACTURED TI-6AL-4V TITANIUM ALLOY

TOMAS TRCKA, ALES POLZER
Keywords: circle segment end mill | laser technology | chipbreaker | Ti-6Al-4V | PCD | additive manufacturing.

Components with generally shaped surfaces requiring higher surface quality and dimensional accuracy are, in most cases, machined. Specifically, milling technology is involved very often, which can be supplemented by finishing operations. Besides standard ball-nose end mills, circle segment end mills are modern type of cutter that has begun to be used with the development of advanced computer aided machi (…)

MODELING AND ANALYSIS OF A VEHICLE DYNAMICS AT FRONTAL IMPACT INTO THE RIGID BARRIER USING A SYSTEM IDENTIFICATION TOOLBOX

JOZEF KMEC, JOZEF PAVELKA, JAROSLAV SOLTES
Keywords: Matlab | System Identification Toolbox | state-space model | Process model with transfer function | Polynomial model | Transfer function model | Kelvin model.

The main objective of this paper is to create computer crash models (up to the level of the Kelvin model, where the coefficient of stiffness and damping is calculated by implementing appropriate numerical methods: Trust - Region, Lavenberg-Marquardt and so on) of measured real data that are obtained at the frontal impact of a vehicle into the rigid barrier. The process of modeling a vehicle crash can b (…)

COMPARISON SELECTED NUMERICAL METHODS FOR THE CALCULATION INVERSE KINEMATICS OF NON-STANDARD MODULAR ROBOTIC ARM CONSISTING OF UNIQUE ROTATIONAL MODULES

STEFAN ONDOCKO, JOZEF SVETLIK, TOMAS STEJSKAL, MICHAL SASALA, LUKAS HRIVNIAK
Keywords: Matlab | inverse kinematics | Jacobian | robotics | unlimited range rotary module | numerical algebra | nonlinear equations

The paper compares the most commonly used numerical methods of solving a set of nonlinear equations, especially in terms of computational speed. The methods are applied to a set of nonlinear equations that describe the forward kinematics of a non-standard robotic arm. This arm is an open-loop kinematics chain, composed of special rotary modules. A non-standard feature of the modules is the unlimited rot (…)

VIBRATION FORECASTING BY THE RESULTS OF SYNCHRONOUS CONTROL OF WATER LEVEL CHANGES IN SEVERAL OBSERVING WELLS

ANTON PANDA, VOLODYMYR NAHORNYI, PETER PIGULEVSKY, IVETA PANDOVA
Keywords: Vibration forecast | lunar-tidal harmonic | trend of the tidal harmonic amplitude | forecast model | shocks environment criticality.

The article presents the results of approbation the vibration forecasting methodology based on the synchronous measurement results of water level fluctuations in several observing wells. These fluctuations are caused by the shocks impact generated in a distant source of a maturing vibrations. The approbation demonstrated the reliable forecast possibility of earthquake time and its epicenter coordinates.

INFLUENCE OF RUNNER CROSS-SECTION ON AIR ENTRAPMENT IN PRESSURE DIE CASTS VOLUME

STEFAN GASPAR, JAN MAJERNIK, TOMAS CORANIC, JAN PASKO
Keywords: HPDC | air entrapment | runner dimensions

Technology of metal die casting is characterized by production of casts complicated as to shape yet with positive mechanical properties and with high repeatability of production. However, casts are porous to a certain extent which eventually reduces their mechanical properties. One of the significant methods of porosity reduction of casts rests in correct design of a gating system. The submitted paper s (…)

NUMERICAL ANALYSIS AND OPTIMIZATION OF THE HOOK FORGING PROCESS

JAN RIHACEK, JAN BARTAK, KAMIL PODANY, MICHAELA CISAROVA, EVA PETERKOVA
Keywords: FEM | FVM | numerical simulation | simufact forming | 37MnSi5 steel

The paper is focused on analysis and optimization of the jaw turnout lock hook forging process, which is used in rail transport. It is forged from 37MnSi5 steel in Kralovopolska LLC. Currently, a fold occasionally occur in the inner side of curved part formation during the forging process, which leads to possible cracks in the finished forged part in some cases. Therefore, optimized semi-finished produc (…)

OPTIMIZING A QUADRUPED ROBOT: A COMPARISON OF TWO METHODS

ROBERT PASTOR, ZDENKO BOBOVSKY, PETR OSCADAL, JAKUB MESICEK, MAREK PAGAC, ERIK PRADA, LUBICA MIKOVA, JAN BABJAK
Keywords: reality-gap | genetic | topology | optimization | quadruped

Robots that have been optimized in simulation often underperform in the real world in comparison to their simulated counterparts. This difference in performance is often called a reality-gap. In this paper, we use two methods, genetic algorithm and topology optimization, to optimize a quadruped robot. We look at the original and optimized robots’ performance in simulation and reality and compare the res (…)

AZURE KINECT BODY TRACKING UNDER REVIEW FOR THE SPECIFIC CASE OF UPPER LIMB EXERCISES

EUGENIO IVORRA, MARIO ORTEGA, MARIANO ALCANIZ
Keywords: Human pose estimation | Microsoft Azure Kinect | Upper limb exercises | OptiTrack system

A tool for human pose estimation and quantification using consumer-level equipment is a long-pursued objective. Many studies have employed the Microsoft Kinect v2 depth camera but with recent release of the new Kinect Azure a revision is required. This work researches the specific case of estimating the range of motion in five upper limb exercises using four different pose estimation methods. These exer (…)

DEVELOPMENT OF A PARALLEL GRIPPER WITH AN EXTENSION NAIL MECHANISM USING A METAL BELT

JUNYA TANAKA, NOBUTO MATSUHIRA
Keywords: Robotic hand | hardware design | manufacturing robot | nail extension mechanism | parallel gripper

Aiming to expand the range of applications for parallel grippers, we propose an extension nail mechanism that can be mounted on a parallel gripper. We also propose an extension nail mechanism comprising a stainless steel belt, two transport belts, a triangular nail, and a drive unit. The triangular nail is connected to one end of the stainless steel belt, and the drive unit is connected near the other e (…)