Manufacturing Technology Journal, 2021 (vol. 21), issue 2
Effects of tandem side-by-side GTAW welds on centerline solidification cracking of AA2024
Abdulaziz Albannai, Abdulkareem Aloraier, Ayman Alaskari, Meshal Alawadhi, Suraj Joshi
Manufacturing Technology 2021, 21(2):151-163 | DOI: 10.21062/mft.2021.035 
Welding techniques such as gas tungsten arc welding (GTAW) can induce solidification cracking owing to the wide solidification temperature range. Riveting or mechanical fastening are plausible alternatives, but can create problems like material loss, overall weight increase, corrosion, and introduction of high stress concentration areas. This study proposes a new welding method to improve and minimize centerline solidification cracking in GTAW called “tandem side-by-side GTAW welds”. AA2024 is fusion welded using GTAW, and its solidification cracking behavior is investigated and compared for two weld pool motions (straight and weaving)...
Path and Trajectory Planning for an Automated Carrier Vehicle Equipped with two Conveyor Belts used in Manufacturing Supply
Ákos Cservenák
Manufacturing Technology 2021, 21(2):164-183 | DOI: 10.21062/mft.2021.027
The AGVs or mobile robots are well used in today’s manufacturing supply technologies and also can be used in engineering’s education. The motion controlling and simulation of such vehicles are a cru-cial question. This paper introduces the steps of motion planning for a driverless carrier vehicle from the positions initially available to the speed of the wheels. The vehicle is located in the High-Tech Logistics Systems Laboratory of the Logistics Institute of the University of Miskolc. For motion con-trolling and simulation between two points the further modules are necessary: 1. path planner, 2. tra-jectory planner, 3. velocity-voltage...
Evaluation of Structural and Mechanical Properties of the Nitrided Layer on Steel for Weapons
David Dobrocký, Zdeněk Joska, Jiří Procházka, Emil Svoboda, Petr Dostál
Manufacturing Technology 2021, 21(2):184-192 | DOI: 10.21062/mft.2021.031
Nitriding is a technology that leads to an increase in the utility value of the product. It’s most im-portant benefits include increased corrosion resistance, abrasion resistance, wear resistance, increased resistance to fatigue failure under cyclic loading, and many others. The design of a suitable nitriding technology not only on the basis of empirics requires a closer study of the relationship between the structure of the nitriding layer, its properties and the course of a particular degradation process. Be-cause the life of most components is related to abrasion on the surface, the occurrence of fatigue cracks and corrosion effects, it is...
Weight reduction in an AA2017 aluminum alloy part through the gas forming process of a blank with a variable thickness
Gillo Giuliano, Wilma Polini
Manufacturing Technology 2021, 21(2):193-199 | DOI: 10.21062/mft.2021.032
Lighter and lighter products are required by aerospace and automotive sectors in order to reduce fuel cost and carbon dioxide emissions and, to allow using green energy propulsion, such as the electric one. In order to lighten parts aluminium alloys, which have a high strength to weight ratio, are the most commonly used metal materials. They are manufactured through plastic deformation processes often by using tailored blanks. This work focuses the attention on semi-finished products obtained by subtract-ing material through machining; they are a further class of tailored blanks. In this work, the design of a simple (almost hemispherical) aluminium...
Influence of the shape of the filling on the mechanical properties of samples made by 3D printing
Zdeněk Joska, Lukáš Andrés, Tomáš Dražan, Karel Maňas, Zdeněk Pokorný, Josef Sedlák
Manufacturing Technology 2021, 21(2):200-206 | DOI: 10.21062/mft.2021.024
In this work the influence of material type and sample fill density was evaluated. One PLA material was tested. Test specimens having different fill structure and density were printed from this material. Full honeycomb and gyroid shapes were used for the fill structure. The specimens had four different fill percentages for each structure: 10%, 25%, 50% and 75%. These bodies were compared to samples that were printed with 100% fill. Tensile test was performed on printed test pieces. The Zwick / Roell Z100 was used for testing and the surface hardness of the test specimens was measured by the Shore D method on a DIGI-Test II hardness tester. Fracture...
Increasing the Structural Strength of Corrosion-resistant Steel for Elastic Components of Diaphragm Compressor
Jan Krmela, Tetiana Hovorun, Kristina Berladir, Artem Artyukhov
Manufacturing Technology 2021, 21(2):207-213 | DOI: 10.21062/mft.2021.034
The design features of diaphragm compressors are discussed in this article. The influence of operat-ing factors on the durability and reliability of a diaphragm made of corrosion-resistant maraging steel is investigated. It is shown that to increase the operational reliability of the compressor's diaphragm elements; it is recommended to use a material, the structure of which contains a certain amount of work-hardened retained austenite. This makes it possible to undergo additional martensitic transfor-mation under the action of peak loads in local areas and increases the structural strength of corrosion-resistant steel for the manufacture of a compressor...
Force and Temperature Conditions of Face Milling with Varying Chip Quotient as a Function of Angle of Rotation
János Kundrák, Zoltán Pálmai, Bernhard Karpuschewski, Csaba Felhő, Tamás Makkai, Dmytro Borysenko
Manufacturing Technology 2021, 21(2):214-222 | DOI: 10.21062/mft.2021.033
Increasing the efficiency of cutting operations while fulfilling the required (expected) quality of the parts constantly requires a thorough knowledge of the chip removal process. This is especially justi-fied in the case of deviations from the usual (traditional) technological conditions or cutting data, both in terms of cutting theory and technique. This paper summarizes some of the results of a study of cutting force and cutting temperature in face milling. The technological analysis of face milling was performed by FEM simulation, which was compared and validated by measuring the cutting force. The chip removal of C45 rolled steel as a function...
Lightweight Design and Optimization Effect Evaluation of Hydro Generator Set
Yongyi Liao, Baiyu Liao
Manufacturing Technology 2021, 21(2):223-230 | DOI: 10.21062/mft.2021.023
With the increase of hydro generators capacity and unit size, the requirement of lightweight is prominent. Taking a mixed-flow hydro generator as the research objects, the strength, the stiffness and the dynamic characteristics of upper bracket, stator frame, lower bracket and head cover have been simulated and analyzed by means of establishing their finite element models. Based on sizing optimization design method, plate thicknesses of the main parts were selected as the design variables, and strength and stiffness were taken as the constraint conditions to optimize them with the minimum mass as the objective function. Through lightweight optimization...
Experimental characterization of microcomposite magnetorheological elastomer
Salah Rouabah, Salah Aguib, Mohamed Hadji, Lallia Kobzili
Manufacturing Technology 2021, 21(2):231-240 | DOI: 10.21062/mft.2021.022
This work presents an analysis experimental of dynamic properties of microcomposite magnetorheological elastomer (MMRE) by a dynamic mechanical analyzer (DMA). The charge of magnetized iron particles is 40% of the total volume. A dynamic mechanical analysis DMA was carried out, in the scanning mode of the amplitude of shear strain, and for magnetic field densities varying from 0mT to 325mT. The storage modulus G’ and the loss modulus G’’, of the elastomer decrease, when the amplitude of the strain increases. This trend is more pronounced under a higher magnetic flux density (250mT and 325mT). In the presence of the magnetic field,...
Resistance of tool steel processed by unconventional forming technology against abrasive wear
Kateřina Rubešová, Michal Peković, Hana Jirková, David Hradil
Manufacturing Technology 2021, 21(2):241-246 | DOI: 10.21062/mft.2021.028
Materials for parts which are subjected to abrasive wear in service are typically selected on the basis of the microstructure type and hardness. Additional characteristics, such as grain size and the size and morphology of carbides are considered less frequently, although they may prove very important. This article deals with treatment cycles which combine an unconventional forming technique and subsequent heat treatment and explores its impact on abrasive wear resistance in X210Cr12 tool steel. Effects of microstructure refinement prior to and during forming and during heat treatment are described. The forming cycle involved semi-solid processing...
Influence of basic environment of geopolymer composites on degradation rates of E and AR type glass fibers
Martina Ryvolová, Lucie Svobodová, Totka Bakalova, Lukáš Voleský
Manufacturing Technology 2021, 21(2):247-254 | DOI: 10.21062/mft.2021.030
The topic of the article is to compare the mechanical properties and define the differences in the degra-dation process for anticorrosive glass fibres type AR and for glass fibres type E after influence of the alkaline environment in the geopolymer composite. The ongoing reactions between glass fibres and al-kaline environment lead to the dissolution and slowly decomposition of the fibres and consequently to the loss of the mechanical properties of the composite. Corrosion of glass fibres is characterized by weight loss, change of fibre diameter, reduction of mechanical properties and formation of mineral in-crustations on the surface of the fibre,...
Characteristic curve of the relation of cutting conditions and the results of metal machining
Karol Vasilko, Zuzana Murčinková
Manufacturing Technology 2021, 21(2):255-260 | DOI: 10.21062/mft.2021.025
Metal machining is a complex technological process based on material removel from semi-product by the influence of a cutting tool which is abrasion-resistant at high mechanic and heat strain. The essence of material removal is based on considerable material plastic deformation under the tool cutting wedge, the result of which is a deformed chip and transformed workpiece surface, which must comply with the geometrical and mechanical workpiece characteristics. These are determined by selected cutting conditions, geometrical and mechanical characteristics of the cutting tool. The selection of cutting conditions is engineering art and requires deep knowledge...
Influence of Rubber Composition on Mechanical Properties
Martin Vašina, Marek Pöschl, Petr Zádrapa
Manufacturing Technology 2021, 21(2):261-269 | DOI: 10.21062/mft.2021.021
The purpose of this contribution is to investigate different mechanical properties of various types of rubber composite materials that were filled with carbon black nanofiller. The rubber composites were produced from three different basic rubbers. Moreover, the composites were produced with different volume concentrations of the basic rubbers including their various ratios. Mechanical properties of the tested rubber composites were investigated by means of tensile testing, Shore hardness, rebound resilience, mechanical friction, abrasion, visco-elastic behaviour and vibration damping measurements. It was found in this study that the rubber composition...
Application of Edge Detection Technique for Surface Roughness Estimation of Ti-6Al-4V Turned Surfaces
Vishwanatha J. S., Srinivasa Pai P.
Manufacturing Technology 2021, 21(2):270-278 | DOI: 10.21062/mft.2021.029
In this research work, a heuristic method based on biologically motivated Particle Swarm Optimization (PSO) has been proposed for edge detection using multiresolution decomposition, to enhance the quality of the images for predicting surface roughness parameter Ra from Ti-6Al-4V turned surface images. First level Dual Tree Complex Wavelet Transform (DTCWT) is used to decompose the turned images to generate new sub band images. The performance of DTCWT with PSO method is examined for turned surface images and compared with conventional edge detectors like Canny, and Sobel methods along with Discrete Wavelet Transform (DWT) with PSO and DTCWT without...
Analysis of the thermal stability of PTFE nanoparticles enriched coating on material made from Al-Si alloy
Igor Zuravsky, Jaroslava Svobodova, Irena Lysonkova, Michal Lattner, Josef Ponikelsky
Manufacturing Technology 2021, 21(2):279-287 | DOI: 10.21062/mft.2021.026
The article focuses on technological procedures of coating of metal molds made from Al-Si alloys, espe-cially used for making tyres. The idea is to create coating on aluminium based metal molds in order to reach a higher number of production cycles between individual cleaning operations in tyre making tech-nology. The experiment was based on a preparation of experimental samples, which were coated with a teflon based product with the addition of nanoparticles (eg. TiO2), in other words, particles as large as tens of nanometres, which were mixed into the teflon solution in a particular concentration. After creat-ing the coating, the experimental samples...