Manufacturing Technology Journal, 2022 (vol. 22), issue 2
Application of Lean Six Sigma for Improve Productivity at The Mechanical Plant. A Case Study
Minh Ly Duc, Minh Nguyen Thu
Manufacturing Technology 2022, 22(2):124-138 | DOI: 10.21062/mft.2022.028 
This study focuses on performing the analysis of manipulator operations on the machining line of precision mechanical products using the Human-Machine correlation analysis tool through images collected from the camera, wasteful operations incurred in machining according to Lean Six Sigma (LSS) standards to control fluctuations in the machining line, improving the overall productivity of the line (OEE). Specifically, contributing to improving productivity, quality, and competitiveness of the company in the market, create a good product image for consumers. This paper proposes a 7-step quality control (QC) cycle improvement model, called 10 step QC cycle....
Kinematic Analysis and Head Injury Criterion in a Pedestrian Collision with a Tram at the Speed of 10 and 20 km.h-1
Ondřej Fanta, Frantisek Lopot, Petr Kubový, Karel Jelen, Dita Hylmarová, Martin Svoboda
Manufacturing Technology 2022, 22(2):139-145 | DOI: 10.21062/mft.2022.024
The issue of accident analysis in relation to railway vehicles of urban mass transportation is highly accentuated at the moment. In terms of designing the frontal area of trams, adequate attention should be paid to the optimal front end design in order to reduce the risk of pedestrian injury. The properly used shape and materials can minimize the consequences of the pedestrian’s contact with the vehicle, or the eventual dragging of the pedestrian under the vehicle. For the front end to be tested and optimized, it is necessary to develop and validate a pedestrian model for performing calculations even in the design preparation stage. From a historical...
Evolution of Mechanical Properties and Microstructure in Q&P Processed Unconventional Medium-Carbon Silicon Steel and Comparison between Q&P Processing, Quenching and Tempering, and Austemperingfor
Štěpán Jeníček, Kateřina Opatová, Jan Hajšman, Ivan Vorel
Manufacturing Technology 2022, 22(2):146-155 | DOI: 10.21062/mft.2022.026
The quenching and partitioning (Q&P) process is an advanced method of heat treatment of high-strength steels. The resulting properties of Q&P-processed steels are dictated by their microstructure which consists of tempered martensite, fresh martensite and retained austenite (RA). These phases arise from individual steps of the Q&P-process. An important step is stabilization of retained austen-ite because RA raises ductility to above the levels found in conventional steels upon quenching and tempering. If the desired stability of RA is to be achieved, Q&P processing must not initiate compet-ing processes associated with carbide precipitation...
Multi-Response Optimization of Friction Stir Welding of AA2050 Using Response Surface Methodology Coupled with Grey Relational Analysis and Principal Component Analysis
Raju Kamminana, Venkata Subbaiah Kambagowni
Manufacturing Technology 2022, 22(2):156-167 | DOI: 10.21062/mft.2022.016
The third generation aluminium-lithium alloy AA2050 finds wide applications in defence and aircraft industries by virtue of its high strength-to-weight ratio and excellent corrosion resistance. Friction stir welding (FSW), relatively novel technique, is more suitable to join this alloy compared to other conventional fusion welding techniques. In this work, the overall quality of the weld joint was decided from the higher values of tensile strength, yield strength, percentage elongation, hardness of weld zone, hardness of heat affected zone, bending load and lower value of width of heat affected zone. The optimal (combined) design was used to design...
Experimental Analysis on the Curing and Adhesive Behaviour of Standard Moisture-cured and Fast-cured Polyurethanes Used in Automotive Industry
Tereza Kordová, Aleš Mareška, Martin Havlík Míka
Manufacturing Technology 2022, 22(2):168-179 | DOI: 10.21062/mft.2022.029
In this paper, the adhesive behaviour of different polyurethane glues was studied and compared. The study was inspired by real conditions in the production of car windows, and it is divided into several parts, which deal with three types of polyurethane adhesives. The first type is a standard one-component polyurethane adhesive, which cures with air humidity. The second type is a one-component polyurethane adhesive with the addition of a curing accelerator. And the third type is a two-component polyurethane adhesive. Adhesive blocks of defined dimensions and plastic parts glued to the glass were used for this experiment to simulate a real product....
Stent Wear Analysis for Percutaneous Coronary Interventions
Daniela Koštialiková, Mariana Janeková, Andrej Dubec, Petra Kováčiková
Manufacturing Technology 2022, 22(2):180-184 | DOI: 10.21062/mft.2022.020
The given paper deals with the issue of materials used in the treatment of heart attacks. In more de-tail it focuses on individual types of stents and their specific properties. The article describes selected groups of biocompatible metal-based materials. Our attention is mainly paid to magnesium alloys. The introduction explains the concept of biocompa-tibility and the distribution of materials accord-ing to their biological tolerance. In the experiment, we performed an ana-lysis of the chemical com-position of individual metal stents and focused on examining their wear resistance. Since it is too difficult to imitate human body environment, we opted...
Microstructure and Mechanical Properties of 3D Printed Tool Steel after Various Precipitation Hardening Treatments
Ludmila Kučerová, Karolína Burdová, Štěpán Jeníček, Julie Volkmannová
Manufacturing Technology 2022, 22(2):185-191 | DOI: 10.21062/mft.2022.030
Precipitation hardening is one of the most frequently used methods of the post-processing heat treatments of 3D printed tool steel 1.2709, as it increases the yield and ultimate tensile strengths of the steel. Within this work, the broad temperature range of 250°C – 550°C was tested with five differ-ent holds at each temperature to study the effect of processing parameters on the microstructure and mechanical properties. Maraging tool steel 1.2709 was produced by selective laser melting (SLM) technology and obtained results were compared with conventionally produced steel of the same chemical composition. Mechanical properties were established...
Comparison of Analytical and Numerical Approach in Bridge Crane Solution
Denis Molnár, Miroslav Blatnický, Ján Dižo
Manufacturing Technology 2022, 22(2):192-199 | DOI: 10.21062/mft.2022.018
A crane bridge is a dominant component of all bridge crane. It is imperative to pay attention on its strength features and go through a strength analysis. The introductory part of this paper points out characteristics of a bridge crane, mainly a crane bridge and materials used to produce the crane bridge, namely S235 structural steel. The paper set out the strength analysis of the main girder of a single girder bridge crane model in the means of comparing analytical and numerical solutions. The calculations take into account the load of the main beam in its centre according to the standard STN 27 0103. The bridge crane model is designed for a 500 kg...
Mechanical Properties of Recycled Polymer Materials in Additive Manufacturing
Jakub Pernica, Matěj Vodák, Robert Šarocký, Michal Šustr, Petr Dostál, Michal Černý, David Dobrocký
Manufacturing Technology 2022, 22(2):200-203 | DOI: 10.21062/mft.2022.017
The publication focuses on the testing of the tensile strength of samples produced by Fused Filament Fabrication additive manufacturing technology. Three materials rPLA, rPETG and rPET were tested. These materials are recycled PLA (Polylactic Acid), PETG (Polyethylene Terephthalate Glucol) and PET (Polyethylene Terephthalate). These materials were used to create samples for tensile testing according to ASTM D638. In addition to testing the materials, the methodology was also tested using sets of specimens printed with no outer perimeters, one outer perimeter and two outer perimeters. Tensile diagrams were created from the measured data. Statistical...
Vacuum System for Reinforcing Fabric Handling
Jan Kužel, Roman Růžek
Manufacturing Technology 2022, 22(2):204-210 | DOI: 10.21062/mft.2022.027
The paper considers questions asotiated with automated systems to produce composite parts. Exist-ing automated systems used in aerospace production are usually based on lay-up technologies. The main objective of the on-going development is to find an affordable production technology for com-posite parts that can be easily automated. The handling with dry reinforcing fabrics is objective of the paper: dry fabric is placed in a suitable mold where it is impregnated by selected type of a matrix and consolidated under vacuum bag afterwards. Based on experiments using standard gripping systems, it was found that local damage of reinforcing fibers occurs....
Cutting Forces in the Milling of Difficult-to-Machine Material used in the Aero Space Industry Using a Monolithic Ceramic Milling Cutter
Silvia Slabejová, Jozef Holubjak, Pavol Timko, Michal Richtárik, Stanislav Krajčoviech, Denis Prokein
Manufacturing Technology 2022, 22(2):211-217 | DOI: 10.21062/mft.2022.019
The constantly developing aerospace industry places demands on increasing productivity and produc-tion efficiency. At present, new construction materials are being produced that have better physical and mechanical properties than conventional materials. In addition to new materials, new cutting materials and new machining technologies are being developed. The combination of suitable machin-ing technology, material and tool will achieve excellent product surface quality, long tool life and thus production efficiency. Due to its mechanical and physical properties, technical ceramics can be used in the machining of difficult-to-machine materials, in which...
Path Planning under The Hull bottom of Painting Robot Based on Heuristic Multi-robot Cooperation in Ship Manufacturing
Lifei Song, Hao Sun, Kaikai Xu, Xiaoqian Shi, Yongqing Zhou
Manufacturing Technology 2022, 22(2):218-230 | DOI: 10.21062/mft.2022.025
In the whole world, the economic loss caused by hull corrosion is enormous. Ship painting has become an important part of ship manufacturing process because it can effectively alleviate the corrosion of ship. The manual painting has disadvantages both in the quality and the efficiency. However, the research of automatic sprayers for a ship hull is not widely used because of the complex environment in the shipyard dock and the huge differences in both size and shape of ships to be repaired. Therefore, this paper pro-posed a new method: according to the ship size and blocks distribution in the blocks’ layout of ship yards, the grid method was used...
Study on Lapping Process of 304 Stainless Steel Using Tribochemical Fixed-Abrasive Lapping Platen
Jianxiu Su, Xiaofeng Zhang, Mingpu Xue, Wen Xiao, Tianyi Zhang
Manufacturing Technology 2022, 22(2):231-239 | DOI: 10.21062/mft.2022.022
Based on the previous research on the 304 stainless steel lapping and polishing in our research group, the tribochemical fixed-abrasive lapping platen for 304 stainless steel lapping and polishing were developed. The effects of the different pressure, the rotation speed, the lapping time and the abrasive size on the surface roughness and the material removal rate (MRR) were researched. It was concluded that when the abrasive size is 28 µm, the lapping time is 15 min, the lapping speed is 90r/min, the lapping pressure is 27.580 KPa, and the maximum MRR is 412.524 nm/min. When the lapping time is 15 minutes, the rotating speed is 15 r/min, the lapping...
Flexural and Out-of-Plane Compression Performance of Hexagonal Rubber Wood Core Sandwich with Increasing Cell Wall Thickness
Jennise Tan Teng Teng, Mohd Yuhazri Yaakob, Mohd Amirhafizan Bin Husin, Kamarul Amir Mohamed, Myia Yuzrina, W. Lau
Manufacturing Technology 2022, 22(2):240-253 | DOI: 10.21062/mft.2022.023
This paper investigates the rubber wood honeycomb core by manipulating its cell wall thickness. Rubber wood honeycomb core was fabricated with cell walls range from 1 mm to 3 mm. The impacts of the cell geometrical parameters on the flexural and out-of-plane compression performance are studied. In the case of solid rubber wood without facesheet, the density is much higher than those rubber wood honeycomb composites. The failure can be disastrous without facesheet under bending. Rubber wood honeycomb sandwiches are able to offer the similar specific flexural strength with lower density. With increasing wall thickness from 1 mm to 3 mm, the specific...
The Mechanical Analysis of ELM Joint under Coupling Field
Xianewei Wang, Xiuxiang Chen, Peng Han, Qinxian Jiang, Xiulian Li
Manufacturing Technology 2022, 22(2):254-259 | DOI: 10.21062/mft.2022.021
The Edge Localized Mode coil is the key component to prohibit the phenomena of disruptive instability occur-ring in the edge of Tokamak plasma. And the coil is made of Stainless Steel Jacketed Mineral Insulated Con-ductors. The different pieces of conductor are connected by joints. During the normal operation of Tokamak device, the joint will be shocked by electromagnetic and thermal loads. Thus, it is necessary to perform the mechanical analysis to verify whether or not the ELM joint has sufficient safety margin to resist the impact of coupling field. In order to obtain the load boundary condition for mechanical analysis, the electromagnetic and thermal...