Manufacturing Technology Journal, 2020 (vol. 20), issue 3
Computing of truss structure using MATLAB
Alžbeta Bakošová, Jan Krmela, Marián Handrik
Manufacturing Technology 2020, 20(3):279-285 | DOI: 10.21062/mft.2020.059 
Trusses are commonly used structure in industrial buildings, warehouses, bridges, transmission tower etc. The analysis of the truss structure design is necessary in order to ensure stable and economical system. This paper presents application for computing planar truss structures that was programmed in environment of MATLAB App Designer using finite element method (FEM). App Designer is programming environment used for creating computing applications with graphical user interface (GUI). The created application for trusses allows users to create geometrical model of the truss structure and input material data, perform static analysis, modal analysis...
Modification of a design of a wheel-tracked chassis of a mine clearing machine
Miroslav Blatnický, Ján Dižo, Jozef Harušinec
Manufacturing Technology 2020, 20(3):286-292 | DOI: 10.21062/mft.2020.044
This article is aimed at design of a support and a tension mechanism to be mounted on a wheel-tracked chassis of a mine clearing machine. The subject machine serves to detect and disposal mines in terrain. The main advantage of this machine is the possibility to use it from the safe distance thanks a remote control. The wheel-tracked chassis mounted on the machine ensures that the machine is able to overcome extreme obstacles of a terrain. The solved design of the wheel-tracked chassis can be modifying to move using just wheels for better driving properties on metalled roads. Current design of the wheel-tracked chassis goes out from the older technical...
Microstructure and Selected Properties of Si3N4 + SiC Composite
Zuzana Gábrišová, Pavol Švec, Alena Brusilová
Manufacturing Technology 2020, 20(3):293-299 | DOI: 10.21062/mft.2020.056
The effects of strengthening phase in particulate ceramic composites on their properties were studied in presented paper. The experimental materials were a monolithic Si3N4 and particulate ceramic composites consisting of Si3N4 matrix with different additions of the SiC strengthening phase (10 and 20 vol.%). The microstructure, density, hardness and fracture toughness of Si3N4 + SiC ceramic composite materials were compared with monolithic Si3N4 based ceramic material. The addition of SiC particles into the Si3N4 based matrix does not positively influence the phase transformation from ?-Si3N4 to ?-Si3N4 in Si3N4 + SiC ceramic composite materials, but...
Finite Element Analysis and Parameter Optimization Selection of High Speed Milling GH4169
Guosheng Geng, Liang Zhang, Maohua Xiao, Xiayun Dong, Kailin Chen
Manufacturing Technology 2020, 20(3):300-306 | DOI: 10.21062/mft.2020.054
Nickel-based superalloy GH4169 has high strength and stability at high temperature and is widely used in aerospace and military fields.However, due to the problems of hard spots and poor thermal conductivity in actual processing,it is difficult for workers to select reasonable processing parameters during processing,which increases the difficulty of processing.In order to optimize the milling parameters,reduce the milling cost and operational difficulties in actual machining,we used ABAQUS finite element analysis software to simulate the 3D milling of GH4169 nickel base superalloy.The variation of milling force during milling was studied.The influences...
Stability analysis of roundness profiles of drawn tubes
Görög Augustín, Görögová Ingrid
Manufacturing Technology 2020, 20(3):307-312 | DOI: 10.21062/mft.2020.051
The geometric accuracy is significant property of the product. For semi-finished products, this accuracy may also affect the accuracy of the final product (the resulting mechanical component). Geometric accuracy (inaccuracy) can be transmitted from one operation to the next in production - technological heredity arises. It is, therefore, essential to analyze the deviations on the produced areas and take measures to ensure that the negative effect of one operation was not transferred to the next operation. It is insufficient to analyze only the numerical values of the measured deviations. It is necessary to directly analyze the measured profiles in...
Advanced Simulation of Metal Additive Manufacturing Using Maraging Steel and Nickel Alloy
Pavel Hanzl, Ivana Zetková, Milan Daňa, Martin Nozar
Manufacturing Technology 2020, 20(3):313-317 | DOI: 10.21062/mft.2020.045
Direct Metal Laser Sintering (DMLS) is a method which builds metal parts in a layer by layer procedure. The melting of metal powder by a laser beam is a complex physical metallurgical process and successful processing of the whole manufacturing procedure requires complex management. Therefore, a successful result is not guaran-teed. The print job is designed based on the designer?s personal experience, and the possibility to verify the cor-rectness of a job proposal would save time and money. Nowadays, there are many kinds of software which allow timely detection of errors in the print job design. This paper deals with demonstrations of print task...
Research of the influence of impurities on the occurrence of intermetallic phases in AlMg3 alloy
Iryna Hren, Štefan Michna, Jaromír Cais, Lenka Michnová
Manufacturing Technology 2020, 20(3):318-326 | DOI: 10.21062/mft.2020.049
The main aim of this work was to investigate the influence of impurities on the occurrence of interemtalic phases in AlMg3 alloy. The effect of accompanying (admixture) elements was studied, namely: manganese, iron and silicon in various combinations of AlMg3 alloy. There was a high manganese content in one melt for AlMg3, a high iron and manganese content in the second, and a high manganese, iron and silicon content in the third. The reason for identifying and monitoring the occurrence of intermetallic phases in these accompanying elements is their limited solubility in aluminum, where they are practically secreted only in the form of different types...
Dilatometric identification of bainitic transformation during Q-P processing of 42SiCr medium carbon steel
Štěpán Jeníček, Jiří Vrtáček, Ivan Vorel, Tomáš Janda
Manufacturing Technology 2020, 20(3):327-334 | DOI: 10.21062/mft.2020.057
Q-P process is one of the latest techniques for heat treatment of high-strength steels with increased silicon levels. It is believed to be based on diffusion and migration of carbon between martensite and untransformed austenite, where the latter becomes enriched with carbon, and therefore becomes thermodynamically stable. However, the question remains whether much of the carbon partitioning in the Q-P process might be the result of the competing bainitic transformation induced by arrested quenching below the Ms temperature. This paper explores the use of dilatometry for identifying the products of austenite decomposition during Q-P processing of medium-carbon...
Acoustic Characteristics of Composite Structures Used in Train
Martin Juricka, Ladislav Fojtl, Soňa Rusnáková, Eva Juřičková
Manufacturing Technology 2020, 20(3):335-341 | DOI: 10.21062/mft.2020.043
This paper presents a study focused on sandwich structures as well-known train construction materials that are composed of two thin and rigid face sheets and a thick, low-density core material. For trains, the wheel-rail inter-face is the main source of noise, and the wheel-rail roughness, especially in the presence of rail corrugation, is the main excitation source transmitted to the interior and area for passengers. The purpose of the study is to optimize the acoustic properties of a composite sandwich panel used for train floors and walls. Sound absorption coefficient (?), noise reduction coefficient (NRC) and Transmission loss (TL) evaluations...
Influence of Tumbling Bodies on Surface Roughness and Geometric Deviations by Additive SLS technology
Jiří Lichovník, Ondřej Mizera, Marek Sadílek, Lenka Čepová, Jan Zelinka, Robert Čep
Manufacturing Technology 2020, 20(3):342-346 | DOI: 10.21062/mft.2020.050
This research focusing on influencing the surface structure and its geometric deviations from the CAD model after various tumbling of bodies at constant parameters of the tumbling machine. The purpose of determining the actual effect on the resulting surface before and after the tumbling pro-cess, which tumbling body causes the selection of a larger grain or compaction of the surface layer. The research outputs are thermographic maps and geometric deviations measured using CAD mod-els. The experimental line was at VŠB - TU Ostrava, with the help of the PROTOLAB 3D printing center, there was an experimental sample in your game. Measurement of access...
The Research of the Different Properties and Production Parameters having Influence on Deep-Drawing Sheets made of AlMg3 Alloy
Štefan Michna, Iryna Hren, Jaromír Cais, Lenka Michnová
Manufacturing Technology 2020, 20(3):347-354 | DOI: 10.21062/mft.2020.035
This work was focused on the research of the different variability production deep-drawing sheets made of AlMg3 alloy which could influence on their deep-drawing properties e.g. non alloying elements Fe, Mn, heat treatment parameters and structure with aim to judge ascertained and analyzed properties of the sheets. The mechanical properties, mainly the highest elongation, and the other parameters (grain size, metallurgical purity), were measured due to they had had the main influence on the deep-drawing properties of the sheets made of AlMg3 alloy. For this research work had been obtained 5 deep-drawing sheets made of AlMg3 alloy with different production...
Microstructural Evolution in 42SiCr Steel in a High-Temperature Chamber Under Microscope Objective
Michal Peković, Hana Jirková, Kateřina Rubešová, Tomáš Janda, Radovan Bureš
Manufacturing Technology 2020, 20(3):355-360 | DOI: 10.21062/mft.2020.053
Thanks to today’s computer programs, engineers can derive a large amount of information from chemical com-position of a material. This information includes phase transformation temperatures Ac1, Ac3, Ms and Mf. CCT and TTT diagrams for austenite decomposition can be determined as well. When steel is heated, austenite grains nu-cleate and grow in the initial microstructure. On cooling, the grains decompose into pearlite, ferrite, cementite and hardening phases. Transformations of this kind are thoroughly described in literature: the ways the individual phases form and the speed of their formation and temperatures involved. However, in-situ visual...
Calculation of the Characteristics of the Multi-gap Seal of the Centrifugal Pump, in Depend-ence on the Chambers' Sizes
Oleksandr Pozovnyi, Andriy Zahorulko, Jan Krmela, Artem Artyukhov, Vladimíra Krmelová
Manufacturing Technology 2020, 20(3):361-367 | DOI: 10.21062/mft.2020.048
The paper presents the results of an experimental research and a numerical calculation of a multi-gap seal of a centrifugal pump. The experimental research allowed to obtain the characteristics? performance of the multi-gap seal at different operating modes, in dependence on the axial size of the chambers, pressure distributions? changes, and a leakage from the seal. Using finite volume methods, values of radial hydrostatic forces, pressure distribu-tions and leakage values were obtained. The results of the numerical calculation were compared with the results of the experiment, which showed that they matched.
Unconventional design of the mechanical crank press developed by the topology optimization
Karel Raz, Milan Cechura, Vaclac Kubec
Manufacturing Technology 2020, 20(3):368-372 | DOI: 10.21062/mft.2020.047
This article deals with the design optimization of the mechanical crank press. These presses have not any signifi-cant development changes in a long time. Mechanical press LDC 250 with nominal force 2.5 MN (250 tons) was considered as an example. This type of press can be used for operations such as bending, drawing or cutting. The topology optimization was used during this research. This papers show advantage of this design method. The op-timized press has lower maximal Von-Mises stress in the structure and the maximal displacement is up to two times lower. The research was focused on the main frame (open frame with shape ?C?) of the press. The resistivity...
Dynamic Simulation Analysis of a Motorcycle Suspension System – Assessment of Comfort
Stefan Segla, Sayantan Roy
Manufacturing Technology 2020, 20(3):373-377 | DOI: 10.21062/mft.2020.052
The paper deals with dynamic in-plane simulation analysis of a motorcycle suspension. The motorcy-cle᾿s mechanical model is considered as a visco-elastically suspended rigid body. Two types of the kinematic excitation are considered ‒ a deterministic „hat“ shaped bump and stochastically uneven road characterized by its power spectral density. The simulation results for both the deterministic bump and stochastically uneven road show that significant reduction of the root mean square value of the motorcycle body centroid acceleration (comfort criterion) can be achieved by placing the lower end point of the rare spring-damper module...
Design of Multi-Part Mould for Production of a Medium-Large Carbon Fibre Component
Michal Skovajsa, Frantisek Sedlacek, Martin Mrazek
Manufacturing Technology 2020, 20(3):378-384 | DOI: 10.21062/mft.2020.055
This paper deals with the design of a multi-part mould for the production of a carbon fibre medium-large compo-nent. The design and forming of a medium-large component which is defined by a closed structure and has high demands on dimensional accuracy is a very complex process. The goal was to design a simple manufacturing pro-cess for a negative mould. There are many different ways to design and manufacture this type of mould. One pos-sible solution was designed and tested. This paper describes the case study of a carbon fibre monocoque of a small racing car. The first step was to define the requirements of the final product and the negative mould....
Using 3D printing technology in prototype production to control the dimensions of complexly shaped products
Filip Šproch, Vladimíra Schindlerová, Ivana Šajdlerová
Manufacturing Technology 2020, 20(3):385-393 | DOI: 10.21062/mft.2020.061
Prototype production is a key element in the process of developing a new product. The prototype is important both for the initial materialization of ideas and intentions for product design, as well as for subsequent assessment of the technological design of this design. 3D printing technology is also used today as a suitable technology for prototype production, especially for the possibility of relatively rapid adaptation to complex shape geometries, the ability to produce what would be difficult or impossible to produce with conventional technologies, and last but not least, the increasing availability of 3D printing equipment.This paper demonstrates...
Hot Pressing of Boron Carbide Based Ceramic Composites
Pavol Švec, Zuzana Gábrišová, Alena Brusilová
Manufacturing Technology 2020, 20(3):394-400 | DOI: 10.21062/mft.2020.046
Ceramic composite materials based on boron carbide were hot pressed utilising in situ reaction of boron carbide powder with 40 wt.% of titanium dioxide sintering additive. The samples were prepared at sintering temperature of 1850 °C, pressure of 35 MPa, and time of 60 min in vacuum atmosphere of about 20 Pa. Optimisation of sintering regime concentrating on both heating stage of sintering and application of pressure enabled to prepare fully dense ceramic composite materials composed of boron carbide matrix with 29.5 vol.% of titanium diboride secondary phase. The ceramic composite reached average density of 99.3 %, hardness of 29.8 GPa, and fracture...
The use of concentrated heat stream to repair AlZn10Si8Mg alloy castings
Mirosław Tupaj, Trytek Andrzej, Karol Łysiak, Wiktoria Zbyrad-Kołodziej, Andrzej Łączek, Ján Majerník
Manufacturing Technology 2020, 20(3):401-408 | DOI: 10.21062/mft.2020.027
The present paper discusses the possibility to use three different sources of concentrated heat stream to repair superficial defects on AlZn10Si8Mg alloy castings. Simulated defects were prepared on specimens taken from a production casting made with the use of low-pressure casting method. The energy sources used to repair the defect were those known as MIG/MAG, TIG, and ML (micro-laser) methods. As the filler, a AlSi5 welding wire was used. The quality of repair was assessed based on both destructive and non-destructive testing. To evaluate porosity of the performed overlay welds, the computer X-ray tomography technique was employed. Metallographic...
Vibration Characteristics of Force Signal for Single Diamond Grit Scratching Process
Haiyong Wu
Manufacturing Technology 2020, 20(3):409-414 | DOI: 10.21062/mft.2020.058
Scratching force is a significant factor to evaluate the characteristics of single diamond grit scratching process. In this paper, experimental study was carried out to investigate the vibration characteristics of force signals during the scratching process. A precise multicomponent dynamometer is employed in the force measurement during a single diamond grit scratching on pure copper. The frequencies of the vibration section of force signals with different scratching parameters are calculated and analyzed. The influence of force signal vibration on the measuring accuracy of dynamometer is systematically analyzed further. The results show that higher...