Manufacturing Technology Journal, 2020 (vol. 20), issue 6
Analytical and experimental solution of vibrations of a system of bound bodies
Vít Černohlávek, Martin Svoboda, Jan Štěrba, Milan Chalupa, Milan Sapieta
Manufacturing Technology 2020, 20(6):699-707 | DOI: 10.21062/mft.2020.116 
The article deals with analytical and experimental solution of vertical oscillations of a mechanical system of bound bodies. The content of the article is to perform an analytical solution of the vertical oscillation of a system of bodies using the computer program MathWorks Matlab and MS Excel. Furthermore, an experimental investigation on a laboratory model of a mechanical system of the same parameters was proved. The aim of the work was to compare the analytical solution with the experimental method and to check the accuracy and applicability of analytical methods for the solved mechanical system.
Microstructure, mechanical and corrosion properties of extruded milled magnesium powder
Drahomír Dvorský, Jiří Kubásek, Dalibor Vojtěch
Manufacturing Technology 2020, 20(6):708-713 | DOI: 10.21062/mft.2020.097
Magnesium materials are interesting for application in medicine as biodegradable implants. There is an ef-fort to improve mechanical and corrosion properties for this application. Powder metallurgy seems to be a progressive method suitable for improving those demanded properties. Therefore, this paper deals with the preparation of pure Mg by extrusion of milled powder. The milling process should lead to better homogenei-ty of microstructure and the disturbing of the oxide layer on the powder particles. Also, the input deformation energy in the milled powder should affect the deformation and recrystallization process during extrusion. In this paper,...
Numerical Simulation and Experimental Analysis of the Magnetic Damping Effect generated by a Moving Magnet
Petr Ferfecki, Marek Konečný, Michal Molčan, Jaroslav Zapoměl
Manufacturing Technology 2020, 20(6):714-719 | DOI: 10.21062/mft.2020.114
Nowadays, to reduce vibrations of machines, damping devices utilize the eddy current damping ef-fect being increasingly investigated for its advantages of no mechanical contact, no viscous liquid required, high reliability, and good damping capacity. This article studied the main principle of the eddy current damping effect for a moving permanent magnet in a stationary and electrically conduc-tive nonmagnetic cylindrical tube. The magnetic damping coefficient is investigated experimentally, analytically, and by numerical simulations in a steady-state. The numerical simulation is performed in the ANSYS Maxwell programme. The obtained results indicate...
Microstructure of zirconium fuel claddings: TEM and EBSD studies of as-received and ne-utron-irradiated materials
Petra Gávelová, Patricie Halodová, Barbora Křivská, Cinthia Antunes Correa, Jakub Krejčí, Martin Ševeček, Vít Rosnecký
Manufacturing Technology 2020, 20(6):720-727 | DOI: 10.21062/mft.2020.088
Zirconium fuel claddings act as a first barrier against release of fission products during nuclear power plant operation and interim storage of the spent fuel. During the reactor operation, cladding tubes are exposed to different stress level at elevated temperatures and neutron irradiation in corrosive environment. It causes a material degradation by corrosion, cladding embrittlement by hydrides and radiation-induced damage or radi-ation growth and creep of the fuel rods. The irradiation damage effects mainly contribute to the loss of material ductility. In our study, microstructure of as-received (non-irradiated) Zr-alloys used in LWR (Zr1Nb, Zr-1Nb-1.2Sn-0.1Fe,...
Planning of a numerical experiment in order to determine the effect of operating factors on the traction-adhesion properties of locomotives
Juraj Gerlici, Mykola Gorbunov, Kateryna Kravchenko, Tomáš Lack
Manufacturing Technology 2020, 20(6):728-732 | DOI: 10.21062/mft.2020.069
The paper reviews the results of an evaluation of the influence of the operating factors on traction-adhesive prop-er-ties of a locomotive. Planning of an xperiment was performed for two locomotives ?freight locomotive 2TE116 and shunting locomotive TEM103. The input for performing the numerical experiment was variation of 6 factors: the change in the wheel diameter of the first wheelset due to wear, the change in the mass of the locomotive as a result of the change in the amount of the fuel as well as the wheel rims wear, the impact of the friction damper in the primary suspension, change in the primary and secondary suspension stiffness due to operation....
A New Optimal Method of Tool Path Generation for Slow Tool Servo Turning of Complex Surface
Hangyan Guo, Min Kang, Wei Zhou, Hengtai Niu, Bingwei Song
Manufacturing Technology 2020, 20(6):733-747 | DOI: 10.21062/mft.2020.115
In order to improve the surface machining quality of slow tool servo (STS) turning in complex sur-faces, the optimal method of tool path generation (TPG) was studied. Taking into consideration the problem of large discrete errors and interpolation errors in TPG, equal height discretization method and interpolation algorithm for non-uniform nodes were proposd and the acceleration continuous condition was introduced. Simulation results showed that equal height discretization method could reduce the discrete error by more than 70%. The interpolation errors could be reduced to two orders of magnitude by transforming segment cubic Hermite interpolation...
Material properties of firefighter ladder composed from AA6063 and few other aluminium-based alloys
Klára Hosová, Jiří Kubásek, Markéta Straková, David Nečas
Manufacturing Technology 2020, 20(6):748-754 | DOI: 10.21062/mft.2020.101
The sectional fire ladders, made of aluminium alloy AA6063, belong to the basic equipment of the fire department of the Czech Republic. The use of these materials facilitates the deployment of ladders for firefighting, but it also brings with it certain pitfalls. During the use of ladders in extinguish-ing fires, their thermal influence and subsequent changes in mechanical properties may occur. This is highly dangerous and can lead to people falling from these ladders due to a significant reduction in the mechanical properties of the material.
Research on optimization of a high precision hydrostatic turntable
Lai Hu, Yaolong Chen
Manufacturing Technology 2020, 20(6):755-762 | DOI: 10.21062/mft.2020.119
This paper mainly studies the hydrostatic turntable of precision milling and grinding compound machining center in aerospace processing equipment, and innovatively designs and analyzes the mesa. It is proposed to replace the traditional 40Cr with imported marble for the mesa. Firstly, the vibration model of the hydrostatic turntable is carried out. ANSYS Workbench software is used to compare and analyze the original and marble materials. In the process, the static characteristics and the difference of first-order modes of the two materials are compared. In addition, the analytical results are used for manufacturing. The results show when the applied...
Assessment of Readiness for Industry 4.0 Implementation in Ceramic Industry
Tomas Kellner, Martin Necas, Michal Kanak, Martin Kyncl, Jiri Kyncl
Manufacturing Technology 2020, 20(6):763-770 | DOI: 10.21062/mft.2020.110
This paper focuses on the implementation of principles of Industry 4.0 concept to the ceramic industry. The topic of this paper is to address the problematics of the implementation of processes and elements of digitization within the Industry 4.0 concept into the ceramic industry. Firstly, thorough literature and best-practice research will be discussed. Based on the state of current knowledge, the concept of the Industry 4.0 Readiness Model for Refractory will be presented. The model’s main focus is on the readiness of current business structures, processes and technical and economical situation. It will provide the necessary analysis...
Influence of cutting parameters and plasma cutting mode on cutting quality and process noise
Marie Kolarikova, Ladislav Kolařík, Tomáš Panáček, Jan Králíček, Miroslav Kučera, Tomáš Gurčík
Manufacturing Technology 2020, 20(6):771-778 | DOI: 10.21062/mft.2020.102
Plasma cutting is an ever-evolving method of industrial cutting of materials. Like all modern methods, it must meet the requirements for the quality of the cut, but also the hygiene and safety regulations set by European legislation. New ways are being sought to reduce process noise while improving the quality of the cutting surface. The article aims to compare two cutting modes (Contour Cut and Silent Cut) in terms of both the quality of the cut (roughness of the cutting surface, size of the heat affected area, perpendicularity and bevel angle of the cutting surface) and in terms of noise of the cutting pro-cess. The results in the article clearly...
Zinc alloys as prospective materials for biodegradable medical devices
Jiří Kubásek, Drahomír Dvorský, Jaroslav Čapek, Straková Markéta, Hosová Klára, Dalibor Vojtěch
Manufacturing Technology 2020, 20(6):779-784 | DOI: 10.21062/mft.2020.113
Zinc-based materials are considered as promising materials for an application like biodegradable medical devices (bone fixations, stents). Such materials have to be characterized by an excellent combination of me-chanical, corrosion and biological properties. Presented paper is focused on the characterization of micro-structure and closely related mechanical properties for 3 zinc materials, namely pure Zn, Zn-0.8Mg and Zn-0.8Mg-0.2Sr. Studied alloys were prepared by gravity casting, homogenization treatment at 350 °C and extru-sion at 200 °C and extrusion ratio 11. Alloying by Mg caused the refinement of microstructure, formation of Mg2Zn11 phase and...
Analysis of affected surface zone created by different cutting technologies
Ludmila Kučerová, Antonín Račický, Iveta Tichá
Manufacturing Technology 2020, 20(6):785-790 | DOI: 10.21062/mft.2020.117
Three cutting technologies, plasma, laser, and acetylene, were used to produce the same geometry of a hole with 33 cm diameter. The plates of the same steel St-37 (1.0038, ČSN 11375) with a thickness of 50 mm were used in all three cases and the aim of the work was to evaluate and compare micro-structure changes of the cut surfaces. Longitudinal and transverse samples were taken from all cuts for subsequent analysis. Light and scanning electron microscopy of surface and below-surface areas were carried out at all samples. Hardness profiles were determined by micro-hardness and nano-hardness measurements. Based on these results, the depth of material...
Accuracy Comparison of the Optical 3D Scanner and CT Scanner
Radomir Mendricky, Jiri Sobotka
Manufacturing Technology 2020, 20(6):791-801 | DOI: 10.21062/mft.2020.120
During the last years, due to the dynamic development of the non-contact measurement methods, there has been observed still increasing number of their applications in various fields - not only in the engineering industry. E.g. from the dimensional quality point of view, knowledge of real 3D data of a given part is truly very important. There are several options for obtaining these data such as the usage of optical 3D digitization or computed tomography (CT). However, within the mutual comparability of such data, it is very important to know not only the accuracy of acquiring 3D data, but also e.g. possibilities of these systems in terms of own measurement....
The modification of surface of barrels by gas nitriding
Zdenek Pokorny, David Dobrocky, Zdenek Joska
Manufacturing Technology 2020, 20(6):802-808 | DOI: 10.21062/mft.2020.118
Steels which are used for manufacturing of highly stressed parts of military equipments such as barrels of small arms weapons must be modified by heat treatment due to achieve required mechanical properties. Moreover, other important properties of functional parts, especially a friction coefficient and surface pa-rameters of bore of barrels, must be optimized due to obtain the best accuracy in target and to increase the life time of barrel [1, 2]. The technology chromium plating, very widespread in the past, has been gradually replacing by more ecological nethods. This article is devoted to find a technology as a replacement of tradi-tional chromium...
Biomedical titanium alloy prepared by additive manufacturing: Effect of processing on tribology
Michaela Roudnicka, Frantisek Bayer, Alena Michalcova, Jiri Kubasek, Enas Ghassan Hamed Alzubi, Dalibor Vojtech
Manufacturing Technology 2020, 20(6):809-816 | DOI: 10.21062/mft.2020.112
In the production of a new generation of customized implants, additive manufacturing (AM) is a hot topic. A titanium-based alloy, Ti6Al4V, is one of the most used materials for such applications with regard to its excellent biocompatibility and high mechanical properties which provide it with the capability to bear physiological loads. However, its resistance to wear is rather poor which might cause undesirable loosening of wear particles or even implant failure. Therefore, enhancing wear resistance is desirable. Thanks to a distinctive principle and rapid cooling, AM is known to be able to enhance mechanical properties. In this paper, we thus discuss...
Use of acoustic emission in the evaluation of corrosion resistance of CMT welds
Jakub Rozlivka, Michal Šustr, Václav Kašpar
Manufacturing Technology 2020, 20(6):817-821 | DOI: 10.21062/mft.2020.077
The objective of this paper was to investigate and respond to the quality and strength of CMT welds that were sub-jected to degradation effects and subsequently to tensile testing. The tensile test was recorded using AE acoustic emission. The experiment focused on the quality of CMT welds (Cold Metal Transfer) and the resistance of these welds to corrosion degradation. Welds are generally exposed to environmental influences such as high stress, stress and degradation effects. The combined effect of these factors may in some cases result in the destruction of weld joints. For this reason, emphasis is placed on the quality of welds and their resistance...
The influence of parameters of the resistance projection welding of M10 steel nuts to the galvanized steel sheet DP 600 on selected joint characteristics
Pavol Sejč, Judita Belanová, Zuzana Gábrišová, Branislav Vanko
Manufacturing Technology 2020, 20(6):822-833 | DOI: 10.21062/mft.2020.090
Projection welding belongs to the group of resistance welding technologies. The basic process parameters are the welding current and the current flow time. Although the resistance projection welding of nuts on galvanized steel sheets is widely used in industry, only a few research articles have been published. The resistance projection weld-ability of the fasteners on metal sheets is not as well understood as the resistance spot weldability of the sheets, so complex studies for the wider application of resistance welding of nuts in the automotive industry are still needed. This research is aimed at valuation the effect of resistance projection welding...
Possibilities of modification of ploughshares used for winter maintenance of forest roads
Miroslava Ťavodová, Monika Vargová, Ladislav Falat
Manufacturing Technology 2020, 20(6):834-844 | DOI: 10.21062/mft.2020.111
The article presents partial results of research to increase the service life of snow ploughshares, which are used for winter maintenance of forest transport roads. The main working tool of vehicles - snow plough is the arrow ploughshare. It is made as a weldment. The contact tool, when in contact with the road, is the rake blade, which is subject to abrasive wear. The experiment consisted of analysing the current state of materials, designing and exploring such options that would ensure a longer ser-vice life of the blades. Welding material was designed to be applied to the base material of the blade. Furthermore, the HARDOX 450 was designed for the...
Use of colour etching in the structural analysis of graphitic cast irons
Alan Vaško, Juraj Belan, Eva Tillová
Manufacturing Technology 2020, 20(6):845-848 | DOI: 10.21062/mft.2020.087
Colour metallography, especially colour etching, is a widely used technique for visualizing different phases in the structure of metals. Its advantage to the traditional etching techniques is that it gives additional information about the structure of material. The paper deals with the structural analysis of graphitic cast irons with a focus on colour etching. The possibilities of extending information about the structure of cast irons using colour contrast compared to classic black-and-white contrast is discussed. The paper is supplemented by photographs of microstructures of graphitic cast irons, obtained using classic black-and-white methods, as...
Research on Anti-interference Control of Hydrostatic Guide Rail’s Oil Film Thickness
Wang Youmin,, Gong Yifan, Yan Zhichao
Manufacturing Technology 2020, 20(6):849-861 | DOI: 10.21062/mft.2020.075
With the rapid development of modern manufacturing technology, people have higher and higher requirements for the quality of mechanical products, and the precision of machine tools for processing mechanical products has gradually increased. Therefore, the development of static pressure guides is particularly important for precision processing industries. The load on the guide rail has an important effect on the thickness of the oil film, and the stability of the oil film thickness directly determines the accuracy of processing. In order to obtain the best control method for the thickness of the oil film, the dimensions of the hydrostatic guide rails...