Manufacturing Technology Journal, 2021 (vol. 21), issue 6
Lattice structure design parameters optimization for the structural integrity of passive vibration isolator
Muhamad Syafwan Azmi, Rainah Ismail, Mohd Fadzli Bin Abdollah
Manufacturing Technology 2021, 21(6):736-748 | DOI: 10.21062/mft.2021.089 
Passive vibration isolator with lower natural frequency has always been a challenge due to structural integrity issues. This study presents the use of RSM statistical tool to analyze and optimize the mechan-ical responses of BCC lattice structure for structural integrity in a passive vibration isolator application. The optimization was done to obtain low stiffness for low natural frequency but high yield stress for optimum load-bearing capability with unit cell size and strut diameter design parameters tweak. From the results, the significance and contribution of each design parameter on each mechanical response through compression test can be understood....
Analysis of Homogeneity and Young’s Moduli of Rubber Compounds by Atomic Force Microscopy
Dana Bakoąová, Alľbeta Bakoąová
Manufacturing Technology 2021, 21(6):749-756 | DOI: 10.21062/mft.2021.099
The atomic force microscopy is method used to obtain surface properties of various materials, includ-ing surface morphology, local magnetization, conductivity and mechanical properties. In this work the atomic force microscope was used to investigate properties of rubber compounds. Three samples made of different rubber compounds that varied in filler content were studied in order to determinate their homogeneity and ratios of their Young’s moduli. Images of their surface topography were ob-tained and then on each sample five places were chosen where spectroscopic curves representing force – distance dependence were scanned. Parts of these...
Ballistic efficiency of hybrid laminates based on aramid and UHMWPE prepregs
Irena Beránková, Regina Mikulíková, Jan Křes»an
Manufacturing Technology 2021, 21(6):757-761 | DOI: 10.21062/mft.2021.092
The work is focused on comparison of ballistic efficiency of homogeneous laminates consisting of one type of prepreg based on aramid or UHMWPE and ballistic efficiency of hybrid laminates consisting of combitation of chosen prepregs layered in different order. For preparation of hybrid laminates the two types of aramid prepregs and two types of UHMWPE prepregs were chosen. The laminates were subjected to ballistic testing by fragment simulating projectile FSP G5 and their ballistic efficiency was evaluated by determination of ballistic limit V50. For more complex assessment of tested laminates with regard to ballistic efficiency and also their areal...
Verification of the safety of storing a pair of pressure vessels
Vít Černohlávek, Jan ©těrba, Martin Svoboda, Tomáą Zdráhal, Marcin Suszyński, Milan Chalupa, Zdeněk Krobot
Manufacturing Technology 2021, 21(6):762-773 | DOI: 10.21062/mft.2021.097
This article deals with the calculation of pressure vessels for beer maturation using analytical calcula-tion according to ČSN standards and with the help of commercial software PVESS. The article pre-sents commonly used procedures in the design of pressure vessels, resp. vessels for use in the brewing industry in the assembly of pressure vessels stacked on top of each other. The article describes the main parts of the brewery tanks, including the procedure for their design. The choice of materials used, the choice of basic dimensions of pressure vessels was determined in the work. The tank vessel is made of stainless steel 1.4301 or 1.4541. The advantages...
Analysis of heat treatment parameters on the properties of selected tool steels M390 and M398 produced with powder metallurgy
Róbert Cíger, Igor Barényi, Michal Krba»a
Manufacturing Technology 2021, 21(6):774-780 | DOI: 10.21062/mft.2021.098
This paper deals with the comparison of two tool steels M390 and M398 produced by powder metallurgy of the MICROCLEAN type. The primary use of steel is in the plastics industry to produce screws for injection moulding machines. The main purpose of the paper is to analyze the hardness after different stages of heat treatment. The first part of the article evaluates the hardness of steels after hardening, which was performed using a hardening dilatometer DIL805A. A total of 8 different controlled cooling measurements were performed, for both types of powdered tool steels, from a maximum rate of 100 °C/s to a minimum of 0.01 ° C/s. Based on the results...
Study on scatter of surface integrity of bearing raceway grinding
Zhou Chang, Lai Hu
Manufacturing Technology 2021, 21(6):781-787 | DOI: 10.21062/mft.2021.090
Taking the discrete degree of bearing raceway grinding surface integrity as the research object, the orthogonal test based on the wheel speed, workpiece speed and grinding depth is designed. The residual stress, retained austenite, hardness, grinding modified layer thickness and roughness of the raceway after grinding test were measured, and the mean value and standard deviation of these indexes were calculated. The results show that the standard deviation of residual stress and roughness decreases with the increase of wheel speed, and the standard deviation of retained austenite, hardness and grinding modified layer thickness keeps stable. Finally,...
Optimization of Drilling Path Using the Bees Algorithm
Shafie Kamaruddin, Mohamad Naqiuddin Rosdi, Nor Aiman Sukindar
Manufacturing Technology 2021, 21(6):788-792
Optimization is the process of finding the best possible solutions of a problem. It has been widely used in various areas especially in engineering problems. One of the common issues that is faced by some of manufacturers is finding drilling sequences of multiple holes. By drilling multiple holes with the least total path length, the manufacturer can save a lot of time and it can increase the productivity of the company. Thus, this study focuses on drilling path of multiple holes problem which has been solved by other researchers. This study uses the Bees Algorithm to find the best sequence of drilling holes (mini-mum total path length) and the results...
Mathematical modeling and numerical simulation of the buckling stability behavior of hybrid beam
Abdelmalek Khebli, Salah Aguib, Chikh Noureddine, Kobzili Lallia, Meloussi Mounir
Manufacturing Technology 2021, 21(6):793-804 | DOI: 10.21062/mft.2021.086
In this article, we studied the phenomenon of instability which is the buckling of the beam elaborated of steel (E36-S355), and magnetorheological elastomer subject to compression-flexion solicitation. The study of the influence of the intensity of the magnetic field on the buckling instability of compressed hybrid beams is done by a mathematical development using the Ritz approach and by a numerical simulation under the Abaqus calculation code. The obtained results show clearly that we can control the instabilities of the adaptive intelligent beams behavior by the magnetic field.
The use of quality tools to reduce surface defects of painted steel structures
Krzysztof Knop
Manufacturing Technology 2021, 21(6):805-817 | DOI: 10.21062/mft.2021.088
The article presents the results of the use of quality instruments – tools and techniques – in order to reduce surface defects of steel structures on the example of a selected element – engine cover of asphalt milling machines. The article shows the potential of using selected quality tools – basic and new – in the service of quality analysis and improvement. Quantitative analyzes were presented out using the Pareto-Lorenz diagram and the c control chart, qualitative analyzes using the Ishikawa diagram and the FMEA method, quantitative & qualitative analyzes using the interrelationship diagram and matrix diagram, and...
Study on the weldability of AA2519 armor grade aluminium alloy
Robert Kosturek, Lucjan ¦nieżek, Krzysztof Grzelak, Janusz Torzewski
Manufacturing Technology 2021, 21(6):818-823 | DOI: 10.21062/mft.2021.093
This paper describes series of studies concerned with welding of Sc-modified AA2519 at the Military University of Technology. The modification of AA2519 alloy contains a higher concentration of scandium and zirconium and it has been developed in The Institute of Non Ferrous Metals, Light Metals Division in Skawina. The examination involves friction stir welding (FSW) and laser beam welding (LBW) of 5 mm thick AA2519-T62 extrusion. FSW process parameters were: 600 rpm tool rotation speed, 100 mm/min welding velocity, 4.8 mm depth plunge, and MX Triflute tool type. The used LBW parameters were as follows: 3.2 kW laser power, 1.1 m/min welding velocity,...
Effect of various heat and thermo-mechanical treatments on low alloyed CMnAlNb high strength steel
Ludmila Kučerová, Iveta Tichá, Adam Stehlík
Manufacturing Technology 2021, 21(6):824-828 | DOI: 10.21062/mft.2021.094
Low carbon low alloyed high strength steel with the chemical composition suitably designed to support the stabilization of retained austenite was used in this work. The steel was processed by conventional annealing for a reference and several different heat and thermo-mechanical treatments were further proposed to test typical TRIP (transformation induced plasticity), DP (dual phase) steel and QP (quenching and partitioning) processing routes. All the processing methods used the same soaking temperature of 1050 °C. Processed samples were subjected to metallographic analysis, hardness measurement and tensile test to characterise resulting microstructures....
Design of Composite Disc Spring for Automotive Suspension with using Numerical Simulation
Martin Mrazek, Michal Skovajsa, Frantisek Sedlacek
Manufacturing Technology 2021, 21(6):829-835 | DOI: 10.21062/mft.2021.100
This paper investigates the replacement of a conventional steel coil spring with a composite disc spring with the aim of minimizing its weight. Simulation in the CAD system Siemens NX 12 was used to determine the composite disc spring’s behavior. The regression functions were stated based on the numerical simulation. Based on the regression functions the solution with the minimum weight was found using software programmed in Matlab. The prototype discs were manufactured from carbon fibre prepreg. Their load-deflection characteristics were tested and compared with the designed values. The experimental results show that using this solution reduces...
3D surface roughness characteristics for biological applications
Jan Podany, Vladimir Stary, Jan Tomicek
Manufacturing Technology 2021, 21(6):836-841 | DOI: 10.21062/mft.2021.096
This paper deals with the topographic evaluation of samples made from materials applied in biomedicine. Different samples were made from Ti, TiAlV, TiNb and austenitic steel – Fe were used together with different surface morphology created. These samples were coated with a layer of TiNb alloy. The goal was to measure surface roughness in individual samples of biomaterials and to evaluate a 3D measurement of surface morphology made with a confocal microscope. Another task was to compare with appropriate software the pictures of material topography acquired at lower and higher magnification. Lower (10x) and higher (200x) magnification was used....
Elimination of resonant phenomena adverse effect in the process of experimental operation of gears
Anna ©meringaiová
Manufacturing Technology 2021, 21(6):842-848 | DOI: 10.21062/mft.2021.087
The paper describes the course, conditions and results of the impact test of the supporting frame of the test station for dynamic tests of gears. The test station makes it possible to simulate different gears operating conditions. The basic support frame structure of the test station was evalu-ated as unsufficient based on the results of measurement and processing of the measured low and high fre-quency vibration values in the verification series of experimental tests. The basic failure of the origi-nal design were the significant resonance actions that were the results of the dominant sources of vibration being near the natural frequencies of the...
Design of T-hangar for aircraft and sports flying sports facilities
Antonín Svoboda, Jan ©těrba
Manufacturing Technology 2021, 21(6):849-854 | DOI: 10.21062/mft.2021.091
This work deals with the construction of a steel hangar with a sheet metal shell for storage sports flying equip-ment (SPE) or general aviation aircraft. The design of the building was made to ensure an individual approach to each aircraft. The construction was designed with price and safety in mind. An available option is an electronic security system connected to the central security desk via the Internet, mobile phone or other data transmission.