Manufacturing Technology Journal, 2017 (vol. 17), issue 4
Bonding of Plywood Using Hot Melt Adhesives
Milan Brožek, Alexandra Nováková, Helena Píšová
Manufacturing Technology 2017, 17(4):423-427 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/423 
The paper presents the strength tests results of joints made by use of two hot melt adhesives. The tests were carried out according to the modified standard ČSN EN 1465 (66 8510) and ČSN EN 205 (66 8508). For bonding the three-layer plywood of 4 mm thickness was used. The test samples of 100 x 25 mm size were cut out from a semi-product in the direction of its longer side, in the oblique direction and in the direction of its shorter side. The specimen pairs were bonded using the hot melt glue gun. All assemblies were loaded up to their destruction. The destructive force and the destruction type were registered. From the results of carried out tests...
Stability of Retained Austenite in High-Strength Martensitic Steels with Low Ms Temperature
Dagmar Bublíková, Bohuslav Mašek, Ivan Vorel, Štěpán Jeníček
Manufacturing Technology 2017, 17(4):428-433 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/428
An important factor in enhancing the mechanical properties of high-strength steels is the stabilization of an appropriate amount of metastable retained austenite in martensitic matrix. Various novel heat treatment and thermomechanical processing routes have been developed recently which benefit from the effects of retained austenite in terms of achieving better elongation at still high ultimate strength levels. One of these procedures is the Q&P process (Quenching and Partitioning). It produces martensite and retained austenite to obtain strengths of more than 2000 MPa and elongation levels of about 10%. For this investigation, four steels with...
Optimization of Resistance Spot Welding Process using Response Surface Methodology and Simulated Annealing
Yordi Kristianto Budiono, Sigit Yoewono Martowibowo
Manufacturing Technology 2017, 17(4):434-440 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/434
This study presents the Resistance Spot Welding (RSW) process of Deep Drawing Steel (DDS) optimization using Response Surface Methodology (RSM) and Simulated Annealing (SA). The RSW process was optimized to obtain the maximum shear force the DDS can withstand. The experiment was conducted under various DDS thickness, welding time and welding current. The experimental processes were conducted using L16 orthogonal array, which has nine rows. The processed DDS was tested using tensile testing machine which will generate the amount of shear force that it can withstand. RSM is first used to develop a suitable mathematical model. The model was tested using...
Corrosion Protection of WE43 Magnesium Alloy by Fluoride Conversion Coating
Drahomir Dvorsky, Jiri Kubasek, Dalibor Vojtech
Manufacturing Technology 2017, 17(4):440-446 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/440
Magnesium alloys are utilized in automotive and aviation industry due to their low density and good mechanical properties. However most magnesium alloys lose mechanical properties at high temperature. Another weak point of magnesium is its high corrosion rate. Alloying by rare earth elements improves mechanical properties, corrosion resistance, and heat stability up to 300 °C by formation of intermetallic phases. Further improvement of corrosion properties can be achieved by coating. Fluoride conversion coating is ideal for magnesium alloy due to its low thickness, good adhesion and easy preparation. In this work, WE43 alloy prepared by extrusion is...
Additively Manufactured Aluminium AlSi10Mg Alloy
Michaela Fousova, Drahomir Dvorsky, Dalibor Vojtech
Manufacturing Technology 2017, 17(4):446-451 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/446
Additive manufacture (AM) is a promising tool to produce sophisticated parts, for example for automotive and aircraft applications, as it excels in astonishing geometry freedom. For such applications, aluminium alloys are of a particular interest thanks to their excellent strength-to-weight ratio. In comparison with the conventional casting of aluminium-based materials, AM brings about some characteristic features; especially unique microstructure evolution. For the real use of additively manufactured parts it is thus important to compare material properties obtained by AM with the cast state. Therefore, this paper brings a comparison of AlSi10Mg alloy...
Effect of Roller Path on the Formability of Drawing Spinning
Z. R. Han, Z. Jia, Y. Xiao, B. M. Liu, Z. J. Fan
Manufacturing Technology 2017, 17(4):451-459 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/451
Drawing spinning is widely used for the manufacture of cylinder parts from disk blank. And the roller path can affect its formability strongly. But how does the effect mechanism work is rarely revealed. The plastic of the metal is one key factor for the failure of spinning such as fracture and wrinkling. In order to reveal the relationship between the roller path and the formability, two working conditions with one-pass (Scheme I) and multi-pass (Scheme II) roller path are proposed. And the comparative analysis of their metal flow evolution is carried out by the finite element method. It is found that one-pass roller path isn't conducive to putting...
Load Capacity of a Gyroid Structure Produced by Selective Laser Melting
Pavel Hanzl, Ivana Zetková, Miroslav Zetek
Manufacturing Technology 2017, 17(4):459-463 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/459
The quest for light and stiff structures by industries such as the medical industry and the aerospace industry is the driving force behind developments in additive manufacturing technology. One way to achieve significant weight reduction of components is by deploying periodic porous structures. Various types of porous structure geometries use material with varying efficiency, and therefore vary in their resulting mechanical and physical properties. This article focuses on the lightweight Schoen Gyroid cellular structure, which could offer a suitable combination of the desired mechanical properties. The goal is to determine the effect of the volume...
Quality of the Cutting Tool Microgeometry for Machining Aluminium Alloys
Ondřej Hronek, Miroslav Zetek, Tomáš Bakša, Pavel Adámek
Manufacturing Technology 2017, 17(4):463-469 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/463
Modern cutting tools with high quality attributes are very important factors for companies that want to increase their production efficiency and product quality. Cutting tool properties include high durability, endurance and cutting power. Quality shapes and surfaces of cutting edge micro and macrogeometry are also important. This article deals with cutting edge microgeometry on sintered carbide end mill tools. Drag finishing technology is used for preparation of cutting edge microgeometry. Two process media are used during the experiment. Due to the different process media, the final surface quality will also be different. Nowadays, cutting edge preparation...
Usage of FEM Simulations in Design of Piping Systems
Zdenek Chval, Frantisek Sedlacek, Vladislav Kemka
Manufacturing Technology 2017, 17(4):469-473 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/469
Quality design is necessary prerequisite for correct and safe operation of all mechanical devices. This design has to consider all simulations and calculations. All boundary conditions have to be involved in this design. Ignorance of some of them can lead to overloading of structure or to the destruction of whole device, as shown in the example in this paper. Following design solutions can improve these mistakes, but this is technically difficult and costs are much higher. This article deals with calculations of air piping and with supporting structures for this system. This example from praxis shows importance both simple calculations and advanced...
Applicable FEM Models for Layered Beams
Jakub Javořík, Pavel Nekoksa, Jan Kledrowetz, Rohitha Keerthiwansa
Manufacturing Technology 2017, 17(4):474-479 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/474
We need to create appropriate and effective numerical (FEM) model to optimize properties of a composite product. The creation and evaluation of an efficient numerical model that could be used for an analysis of layered composite is the aim of this work. The model has to be able to take into account the properties and layout of the individual layers and must allow effective change of these parameters; thickness, material and number of layers especially. Various models of the same product are created and compared. The models differ in the type of used FEM elements. The results of models (deformation primarily) were compared with the result of analytical...
Calculation of the Tyre Curing Mould Cavity Shape Using FEM
Jan Kledrowetz, Jakub Javořík, Rohitha Keerthiwansa, Pavel Nekoksa
Manufacturing Technology 2017, 17(4):479-483 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/479
This paper describes a modelling methodology that predicts a contour of a pneumatic tyre in the curing mould. Tyre contour is designed to be in the equilibrium shape. Such shape is described by a system of complex mathematical equations that has to be solved numerically. In this new approach a standard FEM software is employed to gain the shape without the need of dealing with these equations manually. The quality of the proposal of FEM approach was assessed by comparing the meridian to a verified solution for several tyre constructions and sizes. Selected results are presented to show the accuracy of the FE modelling procedure. Nowadays, most of the...
The Optimization of Sintering Conditions for the Preparation of Ti-Al-Si Alloys
Anna Knaislová, Vendula Šimůnková, Pavel Novák, Filip Průša, Sławomir Cygan, Lucyna Jaworska
Manufacturing Technology 2017, 17(4):483-488 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/483
This work deals with optimization of Spark Plasma Sintering conditions for the preparation of Ti-Al-Si alloys. Ti-Al-Si alloys are appropriate material for high-temperature applications, especially for aerospace and automotive industry. They are characterized by low density, good mechanical properties and resistance against oxidation. Ti-Al-Si alloys were prepared by powder metallurgy using reactive sintering, followed by milling and Spark Plasma Sintering. Preparation of intermetallic compounds is complicated due to high melting points of intermediate phases, the exothermic reaction during their formation and high reactivity of the melt with melting...
Use of Cluster Analysis for Assessment of Surface Replicas Machined by a Laser Beam
Milena Kubišová, Vladimír Pata, Libuše Sýkorová, Martina Malachová
Manufacturing Technology 2017, 17(4):489-493 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/489
This article deals with research of replica preparation of polypropylene surfaces machined by a laser beam. For the production of replicas, we decided to test the material SILOFLEX© which is mainly used in dentistry. There we are also looking for expertise in the preparation and application of this material on the surfaces. Subsequently investigated methods of statistical evaluation. In this article the cluster analysis is primarily used, this analysis uses four basic methods: Ward's Minimum Variance, Furthest Neighbour, Weighted Pair-Group and Pair-Weighted Centroid Group. The results are there also demonstrated using Abbott Firestone curves....
AA 7075 Ultrafine-Grained Alloy Prepared by Mechanical Alloying and Spark Plasma Sintering
Vojtěch Kučera, Dalibor Vojtěch
Manufacturing Technology 2017, 17(4):493-498 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/493
Constantly increasing demands on mechanical properties lead to the search for new materials production technologies. The improvement could be achieved by methods of powder metallurgy, especially the ones capable to manufacture materials with ultra-fine microstructure. The aluminium alloy 7075, which belongs to the one of the strongest commercial aluminium alloys, was prepared by mechanical alloying in combination with spark plasma sintering. The thus-prepared samples were analysed (XRD, XRF, SEM-EDS, compression stress-strain test, Vickers hardness) and compared to its commercially produced equivalent (AA 7075). Mechanical alloying led to complete...
Analysis of Influence Dimensions of the Gate on the Homogeneity of the Low Weight Castings Made of Silumin
Ján Majerník, Ján Kmec, Miroslav Gombár, Michal Halapi
Manufacturing Technology 2017, 17(4):499-502 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/499
The design of the gating system is a major factor in the internal homogeneity for casting. A properly designed system should ensure a proper and continuous filling of cavities in a mold. A continuous filling in a mold cavity gives the initial condition for internal soundness and homogeneity when casting, which in turn is reflected in the quality and mechanical properties. The geometry and shape of the gate models and directs the melt stream entering the mold cavity, this greatly affect the properties of the castings. Homogeneity of castings closely correlates with the mechanical properties of castings. The present paper is devoted to analyzing the...
Process and Equipment Improvement for Nickel Brush Plating Application
Martin Marek, Martin Novak, Tomas Rytina, Numan M. Durakbasa
Manufacturing Technology 2017, 17(4):503-507 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/503
The purpose of this paper is to provide an overview of process and equipment improvements for nickel brush plating applications. At the beginning of this project the company used methodology from a subsidiary which does nickel brush plating. Over time, it turned out that it would require a total redesign of the process, because it wasn't compliant with Czech legislation. We knew that without improvements the process could not move forward, therefore, we mainly focused on safety, equipment, accuracy and better quality. In this work we have been using many elements from quality management such as 6Sigma methodology, Ishikawa diagrams, 5why methods, 5S,...
Rheological Measurement of Polymeric Composites before and after UV Degradation
Lenka Markovičová, Viera Zatkalíková, Milan Uhríčik, Tatiana Liptáková
Manufacturing Technology 2017, 17(4):507-512 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/507
The aim of this paper is the comparison of selected rheological properties of polymeric composites with glass fibers materials before and after exposure in UV box. Rate and depth of degradation induced by the environment were evaluated by Frequency Sweep Test, which monitors changes in viscoelastic properties of polymers with respect to their molecular structure and their behavior in thermoplastic processes. Degradation process resulted in changes of complex dynamic viscosity, storage and loss modulus, changes in molecular weight and its distribution. UV radiation is intense degradation factors affecting the change in the structure and properties of...
Application of Taguchi Method-Moldflow-Particle Swarm Optimization for Plastic Injection Process Parameters Optimization
Sigit Yoewono Martowibowo, Agung Kaswadi, Gita Suryani Lubis
Manufacturing Technology 2017, 17(4):512-519 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/512
Plastic injection process is one of the techniques used to manufacture plastic products. The technique is widely used due to its higher and faster production capacity and low cost. However, production process problems are often found, one of which is inappropriate process parameters settings, which may cause product defects. This paper presents a method using combination of Taguchi method, Moldflow simulation and PSO to optimize plastic injection molding process parameters. Moldflow simulations were run to obtain volumetric shrinkage values resulting from each combination of parameters setting selected by means of OA. In adopting S/N ratio technique...
Numerical Simulation and Experimental Research on Cold Form Tapping Process of Internal Thread
Hong Miao, Qing Mei, Jingyun Yuan, Shanwen Zhang, Yifu Jin, Dunwen Zuo
Manufacturing Technology 2017, 17(4):519-526 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/519
During the cold form tapping process of internal thread in high-strength-steel, the effect of bottom-diameter, extrusion speed, friction factor and extrusion times on extrusion temperature and torque have contributed to tap wear, break and manufacturing quality. The process of cold form tapping of internal thread for Q460 high-strength-steel is studied through numerical simulation and experimental research. The effect of different processing parameters, including the bottom-diameter, extrusion speed, friction factor and extrusion times, on temperature and torque during the process of cold form tapping of internal thread are analyzed to provide new...
Jig Design for Window Frame Welding of Rail-Borne Door Systems
Ivan Mrkvica, Zbyněk Týn, Tomáš Szotkowski, Jana Petrů, Tomáš Zlámal
Manufacturing Technology 2017, 17(4):526-530 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/526
Article deals with design of jig for welding of rail-borne door system on the basis of model and drawing of window frame. Using this jig is ensured right setting and reliable clamping of two bent profiles. By welding of these profiles is made a window frame of automatic door systems for rail-bornes. TIG method is used for welding. Article describes and explains setting and clamping of window frame into jig. Design of control jig for window frames of similar type is embodied in text too. Control jig helps by dimension measurement of window frames.
Mechanical Characterisation of Metal/Polymeric Composite Waste/Metal Sandwich Panel
Miroslav Müller, Alessandro Ruggiero, Petr Valášek
Manufacturing Technology 2017, 17(4):530-536 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/530
The aim of the paper is to compare a tensile strength and an elongation at break of the sandwich materials with different cores created with the polymeric composite mixture at simultaneous acting of the cyclic degradation. The sheet S235J0 is the face. The core of the sandwich panel is from the structural two-component adhesive, from the composite material based on the microparticles of the glass-bead, the rubber and the textile microfibre waste from the tyre recyclation and the rubber particle waste from the tyre recyclation. Namely the secondary raw materials based on the textile microfibres are difficult to utilize in another processing. This research...
Tool Wear Performance Investigation of Stellram Indexable Milling Cutter (XDLT09-D41) for Machining Ti-6Al-4V
Saad Nawaz, Yu Gang, Li Shaoxia, He Xiuli, Ning Weijian, Zheng Caiyun, Miao Haibin
Manufacturing Technology 2017, 17(4):537-542 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/537
An extensive experimental investigation was carried out to study the performance of Stellram Indexable Milling Cutter (XDLT09-D41), used for rough down milling of Ti-6Al-4V alloy. The machining performance was investigated for small depth of cut under different combinations of the operating parameters; like application of high pressure coolant and their impact in terms of tool wear, tool life, thermal crack, etc. The range of operating parameters were broadened, to get comprehensive results in comparison with previous work. The critical observations of the tool wear were at the tool tip/nose and at the bottom part of tool; where thermal deformations...
Influence of Pressure on Al-Si Alloys System
Iva Nová, Jiří Machuta, Ivan Skalický
Manufacturing Technology 2017, 17(4):543-549 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/543
The article deals with the calculation of temperature, the maximal solubility of the solid solution and determination of the eutectic temperature of the system Al-Si under the influence of elevated pressure. Monitoring effects of pressure on the equilibrium system Al-Si has an importance for the study of the crystallisation of aluminium alloys under pressure. Alloys based on aluminium and silicon, commonly referred as silumin, are the most important foundry aluminium alloys. First time binary alloys of this type were made by French chemist Sainte-Clair Devil more than 150 years ago. They showed low mechanical properties (Rm = 98 / 117 MPa, A = 1 /...
Evolution of Microstructure and Mechanical Properties in Steels during Isothermal Holding in the Region of Bainitic Transformation Temperature in Dependence on Silicon Content
Michal Peković, Ivan Vorel, Josef Káňa, Kateřina Opatová
Manufacturing Technology 2017, 17(4):549-555 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/549
Under isothermal treatment conditions, bainite transformation involves decomposition of austenite into a nonequilibrium structure consisting of needles of super-saturated bainitic ferrite and carbide precipitates. Similarly to martensitic transformation, bainitic ferrite forms by shear mechanism. Owing to relatively low temperature, only interstitial elements, predominantly carbon, can migrate by diffusion. Depending on the transformation temperature, carbon migrates from ferrite and forms carbides, either within bainitic ferrite needles and at the interphase interface between bainitic ferrite and austenite, or only within bainitic ferrite needles....
Axial Flow Pump Characteristics and Reliability Analyses at Different Frequency Rotation
Mohammad Emal Qazizada, Elena Pivarčiová
Manufacturing Technology 2017, 17(4):555-561 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/555
This paper focused on axial flow pump high operation, reliability, and long service life at different frequency of rotation (DFR). The efficiency of an axial pump varies considerably depending upon the conditions under which it must operate. This article concentrates methods related to the reliability analysis of pumping system operation by a frequency converter. Initially, it is focused to analyze the behavior of individual characteristic curves of the axial pump to find how can be applied for the determination of the most efficient frequency of rotation. Axial flow pumps are often controlled by adjusting their rotational speed, which affects the...
Analysis of Weld Line Influence on Strength of Nylon Parts
Karel Raz, Martin Zahalka, Zdenek Chval, Ludmila Kucerova
Manufacturing Technology 2017, 17(4):561-565 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/561
Main aim of this article is description of weld line influence on mechanical properties of plastic parts. Special design of mold was created for this research. This mold is able to create specimens with and without weld lines. These specimens undergone tensile test according standard ASTM D638 with different results. Strength and strain results were compared for both types of specimens. Nylon PA6 without any internal reinforcement was used as reference material during testing. Both specimens were investigated also by microscope in order to see composition of weld line and plastic material. Microstructure showed geometry of weld line and also fracture...
Microstructure and Mechanical Properties of Ni-Ti-X Alloys Sintered by Spark Plasma Sintering
Pavel Salvetr, Andrea Školáková, Filip Průša, Pavel Novák
Manufacturing Technology 2017, 17(4):566-569 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/566
In this work, the mechanical alloying with following spark plasma sintering consolidation is presented as a possible way for preparation of Ni-Ti and Ni-Ti-X alloys. The microstructures and mechanical properties of these samples were compared with the samples prepared by reactive sintering, milling and spark plasma sintering. The aluminium, niobium and magnesium were chosen as alloying elements. The microstructures of spark plasma sintered products and their hardness depend on preparation's way of Ni-Ti-X prealloyed powders. The combination of mechanical alloying and spark plasma sintering did not form large areas of the Ti2Ni phase like spark plasma...
Stability of Ni / TiB2 Coating on CuCrZr Electrodes for Resistance Spot Welding Galvanized Steel Sheet
Pavol Sejč, Peter Jaško, Peter Baksa, Judita Belanová
Manufacturing Technology 2017, 17(4):570-576 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/570
Under the influence of heat load and Zn diffusion in resistance spot welding of galvanized steel sheets, significant changes occur on the contact area of CuCrZr welding electrodes which lead to their erosion damage. Changes, causing wear of electrodes not only affect the welding process but also the quality and properties of the weld. Apart from the traditional solution (for example, the so-called "Slope" welding current) the wear of the contact surfaces can be affected by using the barrier layers - coatings. Main goal for the use of material barrier is to minimize the structural changes caused by Zn diffusion, erosion and higher heat resistance of...
Alloying by Magnesium: A Route How to Eliminate the Amount of Ti2Ni Phase in Ni-Ti Alloy
Andrea Školáková, Pavel Salvetr, Pavel Novák
Manufacturing Technology 2017, 17(4):576-579 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/576
This article offers completely new results in the research of NiTi alloys produced by Self-propagating High-temperature Synthesis (SHS). There is investigated the effect of addition of magnesium on the microstructure, phase composition and especially, the amount of undesirable Ti2Ni phase. This phase is unwanted in NiTi alloy because of its brittleness. Moreover, this one is stabilized by oxygen and forms during SHS process. Selected preparation method is considered as an alternative to the melting metallurgy, which produced products with poor homogeneity and purity. For this reason, SHS process has been studied intensely and many researchers have...
Analysis of Contact Stresses of Theoretical and Worn Profile by Using Computer Simulation
Lukáš Smetanka, Pavol Šťastniak
Manufacturing Technology 2017, 17(4):580-585 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/580
The wear of rails and rail wheels is important problem in rail traffic. The change of the shape of the wheel profile has not only a great influence on the dynamic properties of the vehicle (like stability, safety by passing curved tracks, etc.), but also affects the ride comfort of passengers and environmental insults. In extreme cases it can cause rail derailment, which is unwanted status. For these and other reasons, great effort is brought to create a software, which would be capable to compute the wear of a rail wheel profile. The presented article demonstrates how the change of the rail profile influences the resulting contact stresses. The wheel...
The Mechanics of Machining Ultrafine-Grained Ti-6Al-4Mo Alloy Processed Severe Plastic Deformation
Anastasiya Symonova, Enrico Filippi, Ján Kmec, Ján Majerník, Monika Karkova
Manufacturing Technology 2017, 17(4):586-591 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/586
The physics features of the cutting process of ultrafine-grained metals produced by the method of severe plastic deformation are considered. The aim of the research was to evaluate, whether the grain size of titanium alloy has an influence on the characterization of chips, the cutting force components, the surface roughness and the microhardness in the cutting process. The experimental data of the machineability of titanium alloy Ti-6Al-4Mo with sub microcrystalline structure are presented in the paper. The features of the chip formation, the changes of the chip ratio and the components of the cutting force are examined. The main characteristics of...
Examining the Possibilities for Efficiency Improvement of SMED Method Using Simulation Modelling
Péter Tamás
Manufacturing Technology 2017, 17(4):592-597 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/592
We can reach significant results in the field of waste reduction in production processes with application of the tool and rule systems of lean philosophy. One of the frequently applied lean methods is SMED (Single Minute Exchange of Die), which is able to reduce the changeover times and the resulting wastes. Length of the changeover time has a relevant effect on several parameters of the production process (inter-operational inventories, batch sizes, production lead time, manufacturing flexibility, etc.), consequently its reduction is an important competitive factor for a companies. The paper introduces in detail the role of the set-up time in production...
Finite Element Analysis of Counterbore-shaped Parts by Using Sheet-bulk Metal Forming Process
Sutasn Thipprakmas, Arkarapon Sontamino, Wiriyakorn Phanitwong
Manufacturing Technology 2017, 17(4):597-602 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/597
The merits of metal-forming process, as compared to the material removal process, are a good utilization of material and shorten the production time. To fabricate the complex shaped parts, it is increasingly applied. As a particular type of metal-forming process, to produce counterbore-shaped parts, the sheet-bulk metal forming which controls the flow of material into special punch and die was investigated in the present study. The finite element method (FEM) was used as a tool to investigate the sheet-bulk metal forming mechanism and their defects occurred during process. The sheet-bulk metal forming mechanism and poor squareness defect were clearly...
Effect of Roller Burnishing Parameters on Roughness Surface and Hardness of Unalloyed S 355 J0 Steel by Using Response Surface Methodology
Tourab Mohamed, Hamadache Hamid, Aguib Salah, Belhadi Salim
Manufacturing Technology 2017, 17(4):602-610 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/602
Burnishing is a cold working process with superficial plastic deformation, which is to exert an external pressure through a very hard and smooth roller or ball on a surface to occur a uniform and work-hardened surface, to make it possible to reduce roughness, to increase the hardness and to produce residual stresses of compression. The unalloyed S 355 J0 steel specimens were machined on a conventional lathe to the proper dimensions; these machined specimens were then burnished by a simple locally designed and fabricated roller-burnishing tool. The main objective in this work is to determine a mathematical models statistically based on experimental...
Methodology of Increasing Safety of Welding Joints in Pressure Vessels X5CrNi18-10
Martina Vacková, Martin Vaľko, Slavko Pavlenko, Jozef Haľko
Manufacturing Technology 2017, 17(4):611-617 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/611
The paper deals with welding joints and the methodology of increasing safety during austenitic chromium-nickel steels welding - type EN 10028-7 1.4301 (X5CrNi18-10). The technology of submerged arc steel welding 1.4301 using MAG enables a wider application of these steels in terms of the production of pressure vessels, but despite following all the safety regulations of heterogeneous welding stated in WHS, there might be an occurrence of melting defects of carbon parts through the welding of joints. The aim of this paper is to discuss the corrections of welding penetrations of the additional material during inhomogeneous welding, with the least possible...
Quantitative Evaluation of the Shape of Graphite (Circularity) in Graphitic Cast Irons
Alan Vaško, Juraj Belan, Milan Uhríčik, Viera Zatkalíková
Manufacturing Technology 2017, 17(4):617-622 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/617
Shape of graphite in graphitic cast irons is the most important microstructural parameter affecting mechanical properties. The paper deals with evaluation of the shape of graphite in cast irons by shape factor (circularity). Three specimens of graphitic cast irons with different shape of graphite (lamellar, vermicular and nodular) were used for experiments. The aim of this study has been to understand the influence of microstructure (especially shape of graphitic particles) on mechanical properties of graphitic cast irons. However, the evaluation of shape factor is a subject of interest in many fields of applications such as medicine and industrial...
Dynamic Balancing for Mixing Assembly Line Based on PSO - GA Cooperative Optimization
Yongming Wu, Senquan Lin, Longzhou Dai, Lifei Luo
Manufacturing Technology 2017, 17(4):622-628 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/622
Aiming at the evolution balance problem of hybrid assembly line (HAL), a dynamic (evolution) balancing model of assembly line is established, and a cooperative optimization algorithm (PSO-GA) is proposed in this paper. Firstly, HAL evolution in the market diversification and technology progress environment is studied, and assembly line evolution balance is mainly considered. In the PSO-GA, minimizing the number of stations, minimizing the load indexes of between stations and within each station, and adjusting costs are used as optimization objectives. For increasing population diversity and speeding up the searching speed, the individual information...
Development of Asymmetric Multipass Spinning Method for Oblique Cylindrical Shape
Yong Xiao, Zhi-Ren Han, Zuo-Jun Fan, Zhen Jia
Manufacturing Technology 2017, 17(4):628-635 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/628
In previous studies, an asymmetric product is formed by shear spinning. The wall of the product couldn't be perpendicular to the bottom since the thickness of the wall would reduce to zero in shear spinning. In order to break through the limitation and form an oblique cylindrical shape, an asymmetric multipass spinning method combing conventional spinning with asymmetric spinning was developed in this research. The roller trajectory of asymmetric multipass spinning is deduced. The thickness variation is discussed by analyzing the movement of the roller. The thickness distribution and the surface quality with different experiment parameters are discussed....
The Graphene Oxide Spincoating Optimalization by Planned Experiment
Radim Zahradnicek, Tomas Prokes, Libor Benes
Manufacturing Technology 2017, 17(4):635-639 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/635
Spin coating is basic method for preparation of thin polymer resist layer (polycarbonate) or colloidal solution (grapheme oxide in alcohol). This method main benefits are speed of preparation and the possibility of tuning final coating of silicon sample by variations of parameters such as the speed of rotation, time and the amount of the solution. To find out the exact graphene oxide layer spin coating process a planned experiment was designed. The greatest coverage of the silicon sample grapheme was obtained by studying the data obtained from electron microscopy (SEM) and light microscopy (LM) of the spin coating input conditions
Corrosion Behavior of AISI 304 Stainless Steel in Aggressive Chloride Environment
Viera Zatkalíková, Lenka Markovičová, Tatiana Liptáková, Alan Vaško
Manufacturing Technology 2017, 17(4):639-643 | DOI: 10.21062/ujep/x.2017/a/1213-2489/MT/17/4/639
Cr-Ni stainless steels are commonly used for construction of various equipments exposed to halides containing media, which can act aggressively and cause a serious local corrosion damage of these materials. This article focuses on the resistence of AISI 304 stainless steel to the pitting corrosion in 1 M acidified chloride solution represented by mixture 0.9M NaCl + 0.1M HCl, at the ambient temperature of 22 ± 3 °C. An evaluation of the pitting corrosion resistance was based on the cyclic potentiodynamic polarization tests performed on three types of steel surfaces: "as received", electropolished and ground + electropolished surfaces. The pitting...