Manufacturing Technology Journal, 2020 (vol. 20), issue 5
Manufacturing of Vortex Granulators: Simulation of the Vortex Fluidized Bed Functioning under the Disperse Phase Interaction in the Constrained Motion
Artem Artyukhov, Jan Krmela, Vladimíra Krmelová
Manufacturing Technology 2020, 20(5):547-553 
The work presents the computer simulation results describing the motion of the interacting particles in a vortex fluidized bed (the constrained motion). The data obtained reveal the peculiar features of the polydisperse system motion in the apparatuses with the variable cross-section of the workspace. The empirical coefficient determining the residence time of a particle in the vortex fluidized bed was calculated. An algorithm of the residence time cal-culations for a particle in the vortex fluidized bed under the constrained motion is developed. The results of com-puter simulation were a part of engineering (technological and constructive) algorithm...
Experimental study of the influence of selected technological casting parameters on structure and mechanical properties of steel castings
Dana Bakošová, Alžbeta Bakošová
Manufacturing Technology 2020, 20(5):554-559
The aim of the work was to assess influence of technological parameters of casting on thickness and continuity of decarburized layer of castings and their mechanical characteristics in order to suggest adjustment in the production process according to discovered results. The samples for experimental work were taken from one type of casting made from steel 42CrMo4. The thickness of decarburized layer was examined on the samples cast at different temperatures of ceramic mould and at different temperatures of casting. Influence of the wall thickness of the casting was also evaluated. It was ob-served that changing temperature of the ceramic mould does...
The Ti6Al4V Alloy Microstructure Modification Via Various Cooling Rates, its Influence on Hardness and Microhardness
Juraj Belan, Milan Uhríčik, Patrícia Hanusová, Alan Vaško
Manufacturing Technology 2020, 20(5):560-565
Titanium alloy Ti6Al4V falls into the group of alpha-beta titanium alloys and its widely used for engineering application due to its unique mechanical properties in regular or corrosion environments. Mechanical properties of alloy are strictly depending on final microstructure. The microstructure can be varying by various heat-treatment procedures. Heating slightly over beta-transus temperatures, 1050°C, with a dwell of 3 hours and cooling by various rates provide a wide possibility of microstructure modification. The cooling rates were represented by water quenching, air cooling, and furnace cooling. The microstructure has changed from the lamellar...
Use of computed tomography in dimensional quality control and NDT
Libor Beránek, Dora Kroisová, Štěpánka Dvořáčková, Jan Urban, Jan Šimota, Vladislav Andronov, Lukáš Bureš, Lukáš Pelikán
Manufacturing Technology 2020, 20(5):566-575
The article deals with the application of computed tomography in dimensional quality control. The advantage of computed tomography is that the measured part is not influenced by measuring force. It is possible to measure complex parts and assemblies, their geometry, internal structure and defects in one step. The disadvantage of CT is decreasing accuracy and resolution when measuring hi density materials or larger parts, which leads to usage of high accelerating voltage and current. The measurement result is influenced by many factors, not only the instrument itself and the set of measuring parameters, but also largely depends on the sample itself,...
The Mathematical Model Refinement of the Continuous Digging Machine and Its Research
Juraj Gerlici, Svyatoslav Kravets, Mykhailo Honchar, Andrii Koval
Manufacturing Technology 2020, 20(5):576-581
The article presents the results of theoretical research on creating the mobile continuous earthmoving machinery. The aim of the article is to develop and evaluate the effectiveness of technical decisions when creating and mod-ernizing trencher chain and bar actuators. The peculiarity of the performed research is a complex way to solve the problems of ensuring the efficient operation of the earthmoving machinery. It involves a combination of two subsystems: "soil - operating equipment" and "basic chassis ? bearing capacity of soil surface". The mechanisms of changing the power parameters of the machinery load are established. The input parameters for...
The Possibilities of Washing Machine Parts? Modal Parameters Estimation
Martin Hagara, Pavol Lengvarský, Róbert Huňady
Manufacturing Technology 2020, 20(5):582-590
The paper describes the possibility to streamline the process of modal parameters estimation performed on the washing machine heater. As the shape of the mentioned part does not allow to capture its response to excitation using conventional gages of acceleration, Polytec PDV-100 vibrometer based on laser Doppler vibrometry method was used. Such a non-contact device captures the response in a form of velocity only at one point in one direction. For that reason, the process of modal parameters estimation can be relatively timeconsuming, especially in case if the vibration of the analyzed structure occurs in more than one direc-tion. The authors speed...
Predictive modelling and optimisation of surface roughness in turning of AISI 1050 steel using polynomial regression
Riad Harhout, Mohamed Gaceb, Sofiane Haddad, Salah Aguib, Benattia Bloul, Adelhamid Guebli
Manufacturing Technology 2020, 20(5):591-602
Surface integrity plays an important role in the functional performance of mechanical components and is one of the most particular consumer requirements in machined parts. Customarily, surface roughness is considered to be the principal parameter in evaluating surface integrity and surface quality on machined parts and has a significant effect on service reliability and component durability. It is dependent on a large number of machining parameters, such as tool geometry (i.e. nose radius, edge geometry, rake angle, etc.) and cutting conditions (feed, cutting speed, depth of cut). The effects of these parameters have not however been adequately quantified....
Analysis of the influence of surface condition on the corrosion behavior of alloy 2024
Iryna Hren, Sylvia Kusmierczak, Katarína Kurajdová, Milan Luňák
Manufacturing Technology 2020, 20(5):603-611
Machining technology is a widely used chip technology designed for the production of segmented parts. It is widely used in almost all branches of industry, including the automotive industry. Here, the investigated alloy 2024 is widely used. A critical factor in the current design of many of these advanced systems is accurate knowledge of degradation behavior in the work environment in the context of surface condition after surface machining. If this environment causes surface discontinuities, they will significantly affect the life of the part. Corrosion behavior is considered to be an extremely critical factor due to its effect on the service life...
Spectral fatigue life for simple notched component
Adam Kaľavský, Róbert Huňady, Pavol Lengvarsky
Manufacturing Technology 2020, 20(5):612-616
The paper describes a procedure for calculating the lifetime in the frequency domain, which is supplemented by an experiment. The aim of the experiment was to find the required mechanical properties of the material to describe the behavior of the material during fatigue analysis. Experimental modal analysis was performed to estimate damping, which supported numerical calculation and refined results of numerical simulations. The authors made an estimate of fatigue curve (SN-curves) according to ČSN 42 0363 and ČSN ISO 12 107 standards. Knowledge of material fatigue, statistics, modal analysis and signal processing were used in the experimental and numerical...
Process management and technological challenges in the aspect of pernament magnets recycling - the second life of neodymium magnets
Katarzyna Kapustka, Gerhard Ziegmann, Dorota Klimecka-Tatar, Sara Nakonczy
Manufacturing Technology 2020, 20(5):617-624
Very dynamic development in the field of computerization and industry robotization, as well as an im-plementation of the Industry 4.0 assumptions are the main reason for the increased demand for magnetic materials. The limited rare earths availability and the sustainable development in the field of material engineering indicate that the methods of recycling magnetic materials from Waste of Electrical and Electronic Equipment are necessary. This paper presents the impovement stages of magnets recovery process - extrusion process of magnetic scraps/particles with polymer (magnetic scraps and particles obtained from WEEE). The process is developed based...
Numerical Simulation as a Tool to Predict Sheet Metal Forming Process of TRIP Steel HCT690
David Koreček, Pavel Solfronk, Jiří Sobotka
Manufacturing Technology 2020, 20(5):625-631
The submitted paper describes the utilization of numerical simulations to predict sheet metal forming process of ultra-high strength TRIP steel HCT690T EN 10346. Numerical simulations of production processes are increasingly becoming an integral part of the pre-production stage of the sheet metal forming processes. Furthermore, it is possible to use these numerical simulations not only in the production itself (e.g. to test the validity of the process or influence of process parameters, etc.), but also in the post-production stage as a tool for various controls and comparative measurements with the real processes, testing the capacity of the process...
Usage of a non-destructive testing technology for assessment of porosity in aluminium casts alloys
Lenka Kuchariková, Eva Tillová, Michaela Kritikos, Milan Uhríčik, Ivana Švecová
Manufacturing Technology 2020, 20(5):632-638
The assessment of porosity in aluminium casting is the main object to reach the required properties. The determination of amount, size, 3D morphology of casting defect by using a non-destructive (ND) meth-od, especially the computed tomography (CT), is important for assessment casting with complex internal areas that could not be inspected by conventional measurements without failure of the final products. The aim of this study is assessment of bars casted by gravity die casting in to the sand moulds with using the computed tomography. The size, amount and volume of casting defect were assessment by equipment Zeiss Metrotom and software Metrotom OS...
Design and Analysis of Honeycomb based Impact Attenuator
Praveen Malik, Petr Lepsik
Manufacturing Technology 2020, 20(5):639-645
The main idea of this research work is to understand the energy absorbing capacity of cellular solids when used in application of automobile as a safety measure to protect the occupants and structure of the vehicle. The full scaled model of the proposed design of the impact attenuator would be an expensive approach to follow. To understand the mechanism of energy absorption in honeycomb structure two types of experimental test were carried out. The first test includes a simple compression test of honeycomb structure only. The second experimental test consist of a composite sandwich of glass fiber and honeycomb under high speed drop test. Using the...
Research of hybrid adhesive bonds with filler based on coffee bean powder exposed to cyclic loading
Miroslav Müller, Martin Tichý, Vladimír Šleger, Monika Hromasová, Viktor Kolář
Manufacturing Technology 2020, 20(5):646-654
Technology of adhesive bonding belongs to prospective bonding methods. The limit of adhesive bonds is cyclic loading which usually significantly decreases the service life of adhesive bonds and causes deformation of adhesive and cohesive bonds inside of adhesives. The article deals with the research of adhesive bonds exposed to cyclic loading. The aim of research was establishing an influence of the filler based on meshed coffee beans waste added into two-component epoxy matrix for bonding. The differences of mechanical properties of adhesive bonds with filler based on meshed coffee beans waste were evaluated at static and cyclic loading with 1000...
Microstructure of the Alloys Prepared by Reduction of Deep Sea Nodules by Aluminium and Silicon
Pavel Novák, Jakub Vlášek, Petr Dvořák, Andrea Školáková, Kateřina Nová, Anna Knaislová
Manufacturing Technology 2020, 20(5):655-659
Deep sea nodules are considered as an alternative and very rich source of several metals. Up to pre-sent days, the processing of these polymetallic ores is cosidered to be carried out by the extraction of individual metals. This work deals with the processing of the deep-sea nodules by metalothermic method by aluminium and silicon. The nodules are reduced complexely without the extraction of individual metals, forming the polymetallic alloys. Reduction was carried out in a small scale with the initiation in an electric resistance furnace. Microstructures of the formed alloys and the slag were described in dependence on the excess of the reduction agent...
Influence of the Assembly Method of Sleeve Joints on Their Strength
Anna Rudawska, Izabela Miturska, Magd Abdel Wahab, Dana Stančeková, Miroslava Ťavodová
Manufacturing Technology 2020, 20(5):660-667
The aim of the study was to compare the strength of assembly joints of sleeve elements made of different structural, polymeric materials. Experimental tests were carried out to determine the mechanical properties of adhesive and welded joints. Adhesive joints were made of polyvinyl chloride pipes with the use of three types of adhesives: Epidian 53/PAC/100:80, Epidian 53/TFF/100:22, Vodaro 15010-VO. The welded joints were made of polypropylene pipes. All of the joints have been made with the use of a pipe fitting allowing for correct joints. Then the completed joints were subjected to destructive strength tests. The obtained results made it possible...
The Effect of Zinc and Calcium Addition on Magnesium Alloy
Andrea Školáková, Tomáš Lovaši, Jan Pinc, Zdeněk Kačenka, Lenka Rieszová, Zuzana Žofková
Manufacturing Technology 2020, 20(5):668-676
The magnesium alloys, alloyed by the low amount of calcium and zinc concurrently, are considered as a biodegradable materials for implants. However, the as-cast alloy exhibits the insufficient mechanical properties as well as corrosion resistance which are affected mainly by the presence of brittle secondary phases, such as Mg2Ca. For this reason, presented work was focused on the as-cast magnesium alloy with alloying elements (Ca and Zn) whose content did not exceed 1 wt. %, specifically MgCa0.5Zn0.5 (in wt. %). Microstructure consisted of magnesium matrix with a very low amount of Mg2Ca and Ca2Mg6Zn3 phases which crystallized along the boundaries....
Comparision of the bearing rings deformation after heat treatment
Dana Stancekova, Anna Rudawska, Jozef Mrázik, Filip Turian
Manufacturing Technology 2020, 20(5):677-683
This thesis deals with deformations originating from heat treatment of the bearing metals. This is about the comparison of the heat treatment by rotating method in which the parts are feeded individ-ually into the rotating device and heat treated on hardening equipment in continuous way with high capacitive power. After the heat treatment it follows the operations of the grinding of the faces and diameters of the bearing rings. After the hardening we take into account two parameters, which may be mostly affected by hardening process namely: flatness of the faces ( cradle) and outer diameter ovality. Each of such deviations has got adverse influence...
Influence of Elevated Temperatures on the High-Strength X3NiCoMoTi 18-9-5 Maraging Steel Behavior
Angelina Strakosova, Alena Michalcová, Zdeněk Kačenka, Filip Průša, Dalibor Vojtěch
Manufacturing Technology 2020, 20(5):684-689
High-strength X3NiCoMoTi 18-9-5 maraging steel belongs to highly researched materials due to its wide application range. Thanks to its outstanding mechanical properties, it is usually used for high-loaded parts in the aircraft and aerospace industry. Hardness and ultimate tensile strength are strong-ly affected by heat treatment allowing to create Ni3X (X = Mo, Ti), Fe2Mo, and (Fe, Ni, Co)3(Ti, Mo) precipitate which almost doubles their properties. In the present study, microstructure and mechani-cal properties of the thermo-mechanically processed maraging steel were studied two modes of heat treatment. Microhardness values improved from 350 HV0.1...
Characterization of β-Ti alloy prepared by SLM method
Ilona Vonavkova, Dalibor Vojtech, David Palousek
Manufacturing Technology 2020, 20(5):690-696
Ti-6Al-4V alloy is the most commercially used material for the production of orthopedic implants. However, despite its excellent properties, it is not an ideal material for use in medicine in terms of vanadium toxicity and relatively high modulus of elasticity. Titanium β-alloys could be a suitable replacement in future years for Ti-6Al-4V alloy, as they have a lower modulus of elasticity and contain non-toxic elements. Some of the alloying elements may even increase the biocompatibility of the alloy. In addition, a progressive 3D printing method would allow custom-made implants with the required properties to be printed. The aim of this work...