Manufacturing Technology Journal, 2021 (vol. 21), issue 3
A New Coupler Critical Dimensions (CCD) Method for Linkage Mechanisms Mobility Analysis
Md Hazrat Ali, Nazim Mir-Nasiri, Manafaddin Namazov, Husseyn Mirzayev, M. Hassan Tanveer
Manufacturing Technology 2021, 21(3):288-293 | DOI: 10.21062/mft.2021.037 
A new Coupler Critical Dimensions (CCD) approach to define mobility criteria (crank, rocker conditions, or existence) for linkage mechanisms has been presented in this paper. The idea is to analyze the extreme lengths of a mechanism coupler link when the mechanism is on the extreme of its existence or changing its mobility condition. The method leads a set of expressions of the constant mechanism parameters that can be used to define the exact dimensional limits of the coupler link in the mechanism. These expressions present sufficient and necessary dimensional conditions for the mechanism existence and become a turning point to change its mobility...
Application of servqual and servperf methods to assess the quality of teaching services - comparative analysis
Agnieszka Czajkowska, Ingaldi Manuela
Manufacturing Technology 2021, 21(3):294-305 | DOI: 10.21062/mft.2021.041
The features of quality, which is an ambiguous, gradual and very subjective concept, cause that there is no one absolute standard for it. Scientists are looking for ways of its evaluation and improvements of the existing methods. It relates to various areas, but at the same time it is also complex and multi-faceted. There are so many definitions of quality that are constantly evolving. In the paper two meth-ods Servqual and Servperf to assess the quality of teaching services were used. The aim of the paper was to compare the results of the service quality analysis with use of both methods and to indicate the differences between them. It was also checked...
Development of a process based on coagulation of polyurethane in aqueous solution for manu-facturing leather-like products
Rocco Furferi, Walter Sabattini
Manufacturing Technology 2021, 21(3):306-314 | DOI: 10.21062/mft.2021.043
Multilayer synthetic leather-like textiles are traditionally manufactured by using dimethylformamide as a diluent via polymeric polyurethane coating and coagulation processes. Unfortunately, this process has a strong environ-mental impact since it encompass a complex and polluting grinding process to separate dimethylformamide from water. Furthermore, this compound was proved harmful for both environment and textile practitioners’ health. The aim of this work is to improve the state of the art in the production of leather-like fabrics through the devel-opment of an innovative process of coagulation of polyurethane in aqueous solution to replace...
Determining Optimum Shear Strength of Friction Stir Spot Welding Parameters of AA1050/C10100 Joints
Ali Habibizadeh, Mohammad Honarpisheh, Sa’id Golabi
Manufacturing Technology 2021, 21(3):315-329 | DOI: 10.21062/mft.2021.046
Friction stir spot welding (FSSW) is an alternative joining process mostly suitable for joining dissimilar sheets or when conventional spot welding is not applicable. In this paper, lap joint of 2 mm thickness AA1050 aluminum sheets and C10100 copper sheets using different process parameters and fixed tool geometry were investigated. Experimental plan is designed according to response surface methodology (RSM) where: tool rotation speed, plunge depth and dwell time vary between 500 and 2500 rpm, 2.1 and 3.7 mm and 0 and 8 s respectively. The main affecting and interaction process parameters are evaluated using analysis of variance (ANOVA) methodolgy....
Development and Evaluation of a Thin Cerium Oxide-Gelatin Nanolaminate Coating for Corrosion Protection of AISI 316L Stainless Steel
Mohammed T. Hayajneh, Mohammed Almomani, Mohammad Al-Daraghmeh
Manufacturing Technology 2021, 21(3):330-339 | DOI: 10.21062/mft.2021.036
AISI 316L stainless steel is widely used for multiple applications because of its good mechanical properties and corrosion resistance in multiple environments. However, the long exposure of AISI 316L steel to aggressive environments containing chloride ions limits its electrochemical performance significantly. The objective of this research is to develop and evaluate a thin cerium oxide-gelatin nanolaminate coatings for corrosion protection of the spin-coated AISI 316L stainless steel in 3.5% NaCl solution as the corrosion medium. The nanolaminate coat-ings were evaluated by the potentiodynamic polarization technique and the characterization of the...
Damage assessment of the rolling bearing based on the rigid-flexible coupling multi-body vibration model
Zhou Chang, Lai Hu
Manufacturing Technology 2021, 21(3):340-348 | DOI: 10.21062/mft.2021.048
In the present study, local defects in deep groove ball bearings are studied as forward and inverse problems. To this end, the separation-integration method is applied for modeling the forward problem. It is assumed that the inner race of the rolling element is multi-DOF, while the outer race is deformable along the radial direction. Then the problem is modeled with concepts of the finite element method. The contact force for the rolling elements is described by the nonlinear Hertz contact deformation. Various surface defects originating from local deformations are introduced into the developed model. Since the outer ring can be coupled with the FE...
Determination of material properties of laminates of 15T and T3 tram faces
Roman Ježdík, Pavel Konopík, Martin Rund, Martin Svoboda, Karel Jelen
Manufacturing Technology 2021, 21(3):349-356 | DOI: 10.21062/mft.2021.040
The article concerns the testing two thin-walled fiberglass materials. The aim of this work was to perform tensile tests at room temperature in order to determine the stress-relative deformation dependence in selected directions and to compare the properties of each individual material in these directions. Characteristics determined in this way are to be used as inputs in simulation models forming a part of the process of validating the dummy model’s behaviour in simulations of collisions of the tram front with a pedestrian. Tests have been conducted of such properties of those materials used for external panelling of 15T and T3 tram fronts....
Draft of robotic workstation for laser engraving
Frantisek Klimenda, Jan Sterba, Vit Cernohlavek, Josef Ponikelsky, Petr Maran
Manufacturing Technology 2021, 21(3):357-363 | DOI: 10.21062/mft.2021.049
The article deals with the design of a robotic workplace for laser engraving. The first part of the article describes the importance of introducing robotics to industry 4.0. Custom solutions work is devoted to the implementation of the six-axis robotic arm UR10. This six-axis robotic arm inserts the designed jig with the semi-finished product into the engraving machine. In the engraving machine, the semi-finished product is engraved on the final product. This saves the operator time to pinpoint the position of the semi-finished product inside the engraving machine. The proposed jig is designed to be universal so that the position in the x-axis and...
Modeling the energy action of vibration and centrifugal forces on the working medium and parts in a vibration machine oscillating reservoir with an impeller
Janos Kundrak, Andrey V. Mitsyk, Vladimir A. Fedorovich, Angelos P. Markopoulos, Anatoly I. Grabchenko
Manufacturing Technology 2021, 21(3):364-372 | DOI: 10.21062/mft.2021.042
In this paper, the dependences of the tangential component of the velocity of movement of the medium granules, inside the oscillating reservoir, on its radius and oscillation period are obtained. For the anal-ysis, the circulatory motion of working medium granules under the influence of a rotating impeller and the dynamics of a pseudo-gas from abrasive granules exposed to rotating processed parts and an im-peller, are considered. From the results, the comparison of the energy impact on the working medium of the rotating processed parts and the impeller is carried out and the distribution of the pseudo-gas velocity from the abrasive granules and its...
Optimization of Material Removal Rate and Surface Roughness of AISI 316L under Dry Turning Process using Genetic Algorithm
Sigit Yoewono Martowibowo, Bivynka Kemala Damanik
Manufacturing Technology 2021, 21(3):373-380 | DOI: 10.21062/mft.2021.038
The turning process is one of the most common machining operations in various manufacturing industries. It is conducted by eroding the rotating workpiece using a tool that moves in a linear motion. This study examined the genetic algorithm (GA) as the optimization method for the dry turning process of AISI 316L. GA is a meta-heuristic method that imitates the principle of natural selection, in which the most suitable individuals are selected for reproduction to produce the next generation of offspring. The optimization process was started by executing the selected experimental design based on the process parameters and their levels. The tool nose radius,...
Experimental Investigations Towards Hole Accuracy in Micro-drilling of Carbon Fibre Reinforced Polymer Material
Nur Syuhada Nasir, Norfariza Ab Wahab, Badri Bin Sofian, Raja Izamshah, Hiroyuki Sasahara
Manufacturing Technology 2021, 21(3):381-386 | DOI: 10.21062/mft.2021.050
Nowadays, Carbon Fibre Reinforced Polymer (CFRP) materials are extensively used as substitutes for metal parts in aircraft and automotive components since they are lighter in weight. However, mi-cro drilling CFRP materials during the assembly process poses various challenges such as low hole accuracy and delamination. Hence, an experiment has been executed to investigate the influence of micro drilling parameters towards hole accuracy. The spindle speed and feed rate are the machining parameters that have been considered in this experiment. Three different optimum parameters have been obtained from previous experiments, involving the spindle speed...
Symptoms of wear HSS cutting tools in different wear stages
Marcin Paprocki, Mateusz Wygoda, Paweł Wyczesany, Patrycja Bazan
Manufacturing Technology 2021, 21(3):387-397 | DOI: 10.21062/mft.2021.047
Planning a process of production, among other machining processes, is an important stage in the production of products. The developed machining process should allow production of parts with the planned dimensional accuracy and specified surface roughness. With reference to the above, the scope of the carried out theoretical work included determining the dependences between parameters of the drilling process, tool wear, as well as the impact of these parameters on the hole quality. The main aim of experimental research was to analyse cutting tools wear in various phases of tool usage. The research consisted in observation of metallographic microsections...
Tensile Testing of 3D Printed Materials Made by Different Temperature
Jakub Pernica, Michal Sustr, Petr Dostal, Martin Brabec, David Dobrocky
Manufacturing Technology 2021, 21(3):398-404 | DOI: 10.21062/mft.2021.039
The work is focused effect of different temperature nozzle in additive manufacturing process FFF (Fused Fila-ment Fabrication) technology for the most common materials (PLA, PETG and ABS). A standard specimen internal structure arranged ±45° in longitudinal print direction with 100% infill. For the exact testing are used no perimetres. The specimens were printed by minimal, middle and maximum nozzle tem-perature. Temperature range is given by the filament company. To ensure relevant testing materials from the same company in one colour were used. A printed specimens were testing by destructive testing method on tensile testing machine. For testing...
Modification of the Classical Theory of Metalworking
Karol Vasilko, Zuzana Murčinková
Manufacturing Technology 2021, 21(3):405-412 | DOI: 10.21062/mft.2021.044
The paper derives mathematical and ggraphical relationships between technological parameters and result of metalworking, in the application of progresive cutting materials based on coated cutting tools of sintered carbide and cutting ceramits. The development of new cutting and machined materials leads to new perspectives on their interaction in the machining process. This process leads to patterns between cutting conditions and machined results. These need to be defined and used in favor of efficient machining of mechanical components in practice.
Structure Optimization Design for Brake Drum Based on Response Surface Methodology
Bin Zheng, Xin Wang, Jingdong Zhang
Manufacturing Technology 2021, 21(3):413-420 | DOI: 10.21062/mft.2021.045
Taking a brake drum as the research object, the dynamic characteristics analysis and optimization designare carried out by using the finite element method.In order to increase the stiffness without increasing weight of brake drum, the main design parameters were tested by Box-Behnken experiment design. The three-dimensional model of brake drum was established by using SolidWorks software, then the finite element model of brake drumwasobtainedby imported into ANSYS software and its modal analysis was carried out. On the basis of modal analysis, the three important dimensions of brake drum were defined as input parameters, the drum weight, the first,...