Manufacturing Technology Journal, 2015 (vol. 15), issue 3
Structural Design of Blocking Element of Magnetic Cycloid Transmission
Juraj Bezák, Peter Bezák, Alena Vajdová
Manufacturing Technology 2015, 15(3):263-266 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/263 
The contribution deals with the study of magnetic structures, computational methods used in analyzing the interaction of magnetic fields with application this knowledge in practice.The main object of study is design of blocking element of magnetic cycloid gearbox. This paper describes the design methodology of magnetic blocking element, calculation of the braking system, the maximum breakaway torque at slipping in magnetic coupling and power ratios during this action.
Meaning of Quality Inspection and Control Methods during Manufacturing Process of Metal Sheet Stampings
Stanisław Borkowski, Krzysztof Knop, Paweł Szklarzyk
Manufacturing Technology 2015, 15(3):266-274 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/266
The paper presents the characteristics of a metal product called 'Back Cover' and its manufacturing process. The characteristic of quality inspection methods and control devices during manufacturing process of analysed product was conducted. An analysis of production and quality problems during manufacturing of the analysed product using qualitative and quantitative tools such as Ishikawa diagram and Pareto-Lorenz diagram were presented. Ishikawa diagram was used to identify areas that generate quality problems and Pareto-Lorenz diagram was used to quantify the quality problems and to distinguish the critical nonconformities. It was presented differences...
Increasing the Production System Productivity Using Inertial Navigation
Pavol Božek, Yuri Nikitin, Pavol Bezák, Gabriel Fedorko, Michal Fabian
Manufacturing Technology 2015, 15(3):274-278 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/274
The paper addresses the integration of the inertial navigation unit implemented into the system of controlling the robot. It analyses dynamic properties of the sensors of the inertial unit, e.g. gyroscopes and accelerometers. The implementation of the original system of controlling the robot on the basis of autonomous navigation systems into the production system is a dominant part of the paper.
Application of Laser Shock Processing
Jan Brajer, Jan Mádl, Roman Švábek, Zdeněk Pitrmuc, Danijela Rostohar, Pavel Zeman, José Luis Ocaña
Manufacturing Technology 2015, 15(3):278-285 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/278
Laser Shock Processing (LSP), or strengthening the material surface by laser shock wave is very modern and progressive technique, which allows a significant increase in fatigue life of cyclically loaded parts. The compressive residual stresses are generated in the surface layer of material processed by laser beam, which can significantly improve the fatigue properties of the material and reduce the initiation and propagation of the surface cracks. This technique finds practical use of the most demanding applications like in the aerospace industry. For this reason, we are mapping the selected surface properties after the laser treatment for the better...
Spruce Plywood Bonding
Milan Brožek
Manufacturing Technology 2015, 15(3):285-291 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/285
The contribution contains results of bonded joints strength tests. The tests were carried out according to the modified standard CSN EN 1465 (66 8510). For bonding the spruce three-ply wood of 4 mm thickness was used (according to CSN EN 636). The test samples of 100 x 25 mm size were cut out from a semi-product of 2440 x 1220 mm size in the direction of its longer side (angle 0°), in the oblique direction (angle 45°) and in the direction of its shorter side (crosswise - angle 90°). The bonding was carried out using eight different domestic as well as foreign adhesives according to the technology prescribed by the producer. All used adhesives were...
Inovative Methodology for Hot Tears Analysis in the Aluminum Castings
Marek Brůna
Manufacturing Technology 2015, 15(3):291-294 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/291
Hot tears represents serious defects, which are in most cases considered as unacceptable and may even result in disposal of final casting. The cause hot tear initiation is mainly a combination of several mechanisms (incorrect mold construction, chemical composition of used alloy, purity of used alloy, casting process conditions etc.). Basic principles of hot tears initialization can be considered relatively clarified, but a comprehensive and coherent view is still missing. The goal of proposed project was to design a coherent system to analyze emerging hot tears in the aluminum castings. The proposed mechanism is based on a number of concepts - a combination...
Insights for the Selection of the Machining Parameters in the Turning of Difficult-To-Cut Coatings
Diego Carou, Jan Řehoř, Peter Monka, Igor Vilček, Šárka Houdková
Manufacturing Technology 2015, 15(3):295-303 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/295
Usually, the coatings used in industrial applications require post-processing to reach their final shape. However, some of these coatings are difficult-to-cut, mainly because of their high hardness. The present study provides a revision of some experimental investigations on the turning of WC-Co, Stellite, and Fe-based and NiAl alloys. The materials are used for both coatings and sintered workpieces providing insights for conducting turning tests. For the success of the turning process, the selection of the machining parameters is a critical issue. Based on the reviewed investigations, the surface roughness is clearly influenced by the feed rate, expecting...
Surface Treatment Technologies for Wear Resistance Increasing of 42CrMo4 Steel
Van Thanh Doan, David Kusmic, Miroslav Pospichal
Manufacturing Technology 2015, 15(3):303-307 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/303
The present study was directed to investigate the mechanical and tribological properties of 42CrMo4 (CSN 41 5142.3) steel, which was thermochemical treated by the technologies of tenifer, manganese phosphate and plasma nitriding combining with blackening. Plasma nitriding was carried out for the samples under different condition of gas mixture under temperature of 480ºC (plasma sputtering) and 500ºC (plasma nitriding process) for 10h. Besides determining the microhardness (HV 0.05), surface hardness, and microstructure, this paper also concentrates on the field of wear resistance evaluation and friction coefficient of these surface treatments....
The Assessment of Selected Mechanical Properties of Steel after Application of Plasma Nitriding
David Dobrocký, David Kusmič
Manufacturing Technology 2015, 15(3):307-315 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/307
The article deals with mechanical properties of plasma nitrided steel. Experimental work was focused on evaluation of influence of plasma nitriding process to notch toughness of steel, the experimental were realised on V-notch samples of size 10x10x55 mm (according to CSN ISO 148-1 standard). Nitrided layers were applied to steel 30CrMoV9 which were subsequently evaluated by metallographic, GDOES and microhardness method. The notch toughness tests of steel were carried out using the instrumental Charpy hammer at temperatures -40 °C, +21 °C and + 70 °C. The results of experiments showed that plasma nitriding process has a direct impact on change of...
Structural Characteristics of Cr-Mo Steels Microalloyed with Cerium
Jaromír Drápala, Pavel Machovčák, Petr Jonšta, Vu The Ha, Silvie Brožová, Gabriela Kostiuková, Michal Madaj
Manufacturing Technology 2015, 15(3):315-322 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/315
The results of an experimental study on influence of cerium addition on structural characteristics of 42CrMo4 steel are presented. Alloying with cerium was carried out using profile filled with powdered mixture of mischmetal. The samples were taken from two ingots cast in the VHM's steelworks with standard time of casting of about 14 minutes. Three steel bars from one of the produced ingots were prepared by forging. Chemical composition, macro- and microstructure, X-ray EDX chemical microanalysis, hardness of the all steel samples were obtained. Cerium addition resulted in the formation of micrometer size inclusions which can be utilized for controlling...
Experimental Investigation and Analysis of Cutting Forces When Machining X5CrNi18-10 Stainless Steel
Rozmarina Dubovska, Jozef Majerik
Manufacturing Technology 2015, 15(3):322-329 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/322
In this study, cutting forces experimental measurement an analysis with special carbide insert when turning austenitic stainless steel have been investigated. Stainless steel X5CrNi18-10 is often considered as poorly machinable material. In this experimental study a number of turning tests carried out by using a test lathe and a cutting force measuring device are presented. Accordingly the effect of cutting speed and tool insert cutting geometry on cutting forces in turning austenitic stainless steel X5CrNi18-10 (AISI 304) using Wiper cemented carbide tool insert has been discussed. The effect of cutting parameters (feed rate, depth of cut) is also...
Effect of Spindle Unit Extrusion on Stability of Machining Process
Zdenek Fiala, Ales Jaros, Josef Sedlak, Ladislav Kolar, Vendula Blazkova
Manufacturing Technology 2015, 15(3):329-333 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/329
Dynamic characteristics of a machine-tool-workpiece system are not constant during machining, but they can be changed by a variable spindle position, a rising tool wear or a gradual change of a workpiece geometry. This paper deals with an influence of spindle unit extrusion on stability of a machining process. Two milling cutters with different rigidity, flexible and stiff, were used for experimental machining at three axis milling machines. Clamped milling cutters were extracted systematically and a frequency response function was measured simultaneously. Reached data (natural frequency and dynamic compliance) were used for finding a correlation between...
Optimization of Overmolding Process of Metal-Plastic Part
Ernest Gondár, Alexander Schrek, Pavol Švec
Manufacturing Technology 2015, 15(3):334-339 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/334
Metal-plastic parts with steel inserts prepared by overmolding technique showed several cracks. Cracks marked as no 1 and 2 were noticed immediately after overmoulding process. Cracks no 3 and 4 were propagated only several days after overmolding, during post crystallization of plastic. The superposition of both high residual stresses at the metal-plastic interface and creation of cold joints in overmolding plastic were the reasons of cracks initiations. Residual stresses at the metal-plastic interface exceeding the yield strength of plastic were confirmed by simulation in Moldflow software. The differences in the melt front temperature above 20 °C...
The Research Results in the Area Of Environmental Taxation of Manufacturing Business Entities in the Czech Republic
Zdeněk Hruška, Lilia Dvořáková
Manufacturing Technology 2015, 15(3):339-344 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/339
The paper deals with the current topic of environmental taxes on the level of the Czech Republic. The urgency of the topic is highlighted by the dynamic international development of environmental taxation and continuous unification within the European Union. Environmental taxes affect the final consumers of solid fuels, electricity and natural gas and some other gases. The paper researches the impact of environmental taxes on a selected group of manufacturing business entities which are largely consumers of products taxed by environmental taxes. This type of taxes represents a part of corporate environmental costs and as such it is necessary to manage...
Non-Destructive Experimental Method for Determination of Modulus of Elasticity of Hydraulic Hoses
Lumír Hružík, Adam Bureček, Martin Vašina, Ondřej Bílek
Manufacturing Technology 2015, 15(3):344-350 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/344
This article deals with a non-destructive experimental method for determination of modulus of elasticity of hydraulic hoses. There is described experimental equipment for determination of the modulus of elasticity of hydraulic hoses by expansion method. The modulus of elasticity is determined for several hydraulic hoses of different parameters on basis of combined hydraulic capacity of oil and hose. Furthermore it is necessary to know oil bulk modulus. The modulus of elasticity of hoses is very important during design of a hydraulic system. It is necessary to take into account the modulus of elasticity of hoses in a mathematical simulation model of...
Numerical Study on Effect of Narrow Groove On Hot Bearing Ring Rolling Process
Jia Z., Han Z. R., Peng W. F.
Manufacturing Technology 2015, 15(3):350-357 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/350
Ball-section raceway groove and narrow groove ring (BGNGR) is a complex part of bearing rings. The mandrel for the forming of the narrow groove will push and press the metal and lead to instability of the rolling process. Therefore, the effect of the narrow groove on the metal flow is investigated. Two methods for BGNGR rolling are presented, and by deducing the dimensional relationship between rectangular blank and deformed ring, the finite element models for both methods are established and simulated in Forge3D software. Method I is proved to be a failure through the finite element analyses of the effect of the narrow groove on the metal flow. Based...
The Effect of Cutting Temperature on Carbide Drilling Life in the Process of CFRP/Steel Stacks Drilling
Vitalii Kolesnyk, Dmytro Kryvoruchko, Michal Hatala, Dusan Mital, Zuzana Hutyrova, Jan Duplak, Mohammed Alowa
Manufacturing Technology 2015, 15(3):357-362 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/357
The fiber reinforced plastic (CFRP) are widely used in stacks with metallic materials. The parts are usually bolted together during assembling procedure. That is why drilling is one of the most widely used operations for machining of CFRP/metal and metal/CFRP stacks. That allows to obtain components, which combine high strength and low weight. This paper presents tool wear study based on the drilling experiment of CFRP/ steel stack. The most common problems of CFRP/metal stacks machining are CFRP delamination, fiber pull - out, thermal degradation and intensive tool wear. Last decade such parameters of CFRP/metal stacks drilling as axial force and...
The Determination of the Shelf Mass in the Universal Shelving Stacker by Measuring the Frequency Converter Torque Generating Current of the Main Drive
Pavol Kollár, Yuri Nikitin, Martin Straka
Manufacturing Technology 2015, 15(3):363-366 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/363
The correct determination of the shelf mass including content is very important for the proper function of a universal shelf stacker (USS) drives life and construction USS so that these elements were not overloaded. Weighing can be done by direct methods using various sensors tension and compression but also the indirect method, by the torque sensing of current frequency converter, which controls the speed of the three-phase asynchronous motor. This method does not require any additional construction or adaptation or additional sensors or electronic evaluation system power operation. Weighting method of shelf in USS is based on the fact that the torque...
Effects of a Cutting Fluid on Aerosol Size Distribution during Turning
Luboš Kotek, Petra Semanová, Erika Sujová, Miroslav Dado, Marián Kučera, Richard Hnilica, Martin Jonák
Manufacturing Technology 2015, 15(3):367-373 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/367
Cutting fluids are complex mixtures used to cool, lubricate and remove metal chips from tools and metal parts during grinding, cutting, or boring operations. Utilization of cutting fluids in the technological process of metalworking often generates aerosols which represent a significant hazard to the safety of workers and to the environment. The paper deals with the research of cutting fluid's impact on aerosol production by expressing particle size distribution. We used a special image analysis algorithm for the data obtained by a high-speed camera to determine the particle size. The procedure of result assessment was created for measuring the size...
Material Analysis of Damaged Breech Locking Element of Machine Gun
David Kusmic, Zbynek Studeny, Emil Svoboda
Manufacturing Technology 2015, 15(3):373-377 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/373
Weapons are special systems, which have high demand in terms of reliability, safety and durability especially in the case of automatic weapons. The most stressed parts of weapons are barrels, breech, locking elements etc. This paper si focused on the failure of locking element, which is used for set the breech baffle and for locking of the breech. From the structural point of view the locking element is highly dynamically stressed component. During the shooting cycles are the shocks transferred into these components, therefore specified material requirements of the locking element are needed. The material of locking element must be modified to hard...
Compressive Creep Testing of Composites on the Based of MoSi2 - SiC Nanoparticles
Natália Luptáková, Beáta Ballógová, Petr Dymáček
Manufacturing Technology 2015, 15(3):377-380 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/377
The aim of this study is to investigate the creep resistance of molybdenum disilicide (MoSi2-SiC) based composites with different types of embedded particles. The materials were prepared via powder metallurgy using high temperature controlled reaction sintering (CRS). The creep experiments were performed in uniaxial compression at constant stress in the temperature range from 1273 K (1000 °C) to 1473 K (1200 °C) for applied stress from 50 to 100 MPa. Creep was tested by stepwise loading: in each step, the load was changed to a new value after steady state creep rate had been established. The applied stress dependences of the creep rate at different...
Cutting Tool Wear Monitoring
Jan Madl, Michal Martinovsky
Manufacturing Technology 2015, 15(3):380-384 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/380
Cutting tool wear monitoring is one of key problems in automation of machining processes. Apart from the cutting tool wear monitoring for the cutting tool change and cutting tool failure, cutting tool wear monitoring may be one of the components for the adaptive control of a machining process. This paper is focused on the design of turning cutting tool wear sensors of the system flap - jet principal with increased extend. On the geometric principles in cutting with a turning cutting tool, the relations among the output of jet mouth, clearance angle and cutting tool wear were expressed. Two variants of turning cutting tool sensors were designed and...
Design Theory for Screw Geometry in a Briquette Press
Miloš Matúš, Ľubomír Šooš, Peter Križan, Juraj Beniak, Juraj Ondruška
Manufacturing Technology 2015, 15(3):384-391 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/384
This paper focuses on the structural design of screw tools in briquetting presses used for the production of solid, high quality, bio fuels. The primary objective is to analyse the screw tool geometry and determine a procedure for its design, specifically the theory involved with the pressing tool and force relations which are necessary for the verification of the proposed tool geometry and its strength analysis. In designing the main drive of the press, procedures for determining frictional performance of the screw press are used. Familiarity with the above mentioned procedures forms the basis for research into new tools in screw briquetting presses...
Research on Constructional Shape of Bond at Connecting Galvanized Sheet of Metal
Miroslav Müller
Manufacturing Technology 2015, 15(3):392-396 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/392
A constructional shape of an adhesive bond deals with a mutual position of bonded parts in such way to gain a given contact area. The constructional shape of the adhesive bond finds a practical application at connecting of plain areas that means sheets of metal above all. The adhesive bond strength at connecting the galvanized sheet of metal was significantly lower than at connecting a constructional carbon steel. Results of specimens of wavy-lap bonds showed higher values of the adhesive bond strength comparing with specimens of single-lap bonds. The wavy-lap constructional adjustment proved to be positive at connecting the galvanized sheet of metal....
Investigations of Cutting Tool Wear While Machining Inconel 718
Jana Petru, Jan Schiffner, Tomas Zlamal, Marek Sadilek, Dana Stancekova
Manufacturing Technology 2015, 15(3):396-403 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/396
This contribution describes the progress of wear and influences contributing to wear of a cutting tool during straightturning of the Nickel superalloy Inconel 718 according to W. Nr 2.4668. According to the ISO 513 standard this alloy belongs among heat resistant materials; it is a special Nickel alloy used primarily for machine parts in the aircraft industry. The experimental part was done for the purpose of testing suitability of proposed exchangeable cutting inserts intended for machining of Inconel 718. Mechanisms and magnitude of wear and durability of the tools were determined in accordance with the ISO 3685:1993 standard in order to evaluate...
Characteristics of Plasma Nitrided Layers
Zdenek Pokorny, Zbynek Studeny, Miroslav Pospichal, Zdenek Joska, Vojtech Hruby
Manufacturing Technology 2015, 15(3):403-409 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/403
This article deals with mechanical and chemical properties of nitrided layers which were created by plasma nitriding technology. The aim is to achieve an enhanced surface hardness, better wear resistance, reduced friction coefficient, increase fatigue limit or corrosion resistance. Experiments are focused on using of plasma nitriding process for surface treatment of cavities with diameter of 6 mm. Nitrided layers were applied to steel PO 209 which were subsequently evaluated by metallographic, GDOES, XRD microanalysis and microhardness methods. The results of measurement showed trends of chemical composition of alloying elements after chemical-heat...
Reaming of Very Precise Holes in Hydrostatic Component
Jan Řehoř, Jaroslava Fulemová, Daniel Rut, Veronika Třísková, Jan Kutlwašer, Karel Kouřil
Manufacturing Technology 2015, 15(3):409-415 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/409
Nowadays, one of the motive trend in engineering industry is transportation and manipulating technology. The hydrostatic mechanisms belong to the most important components and are created by hydraulic engines, pumps, switchgears etc. Inseparable part of hydraulic engine is a servo-valve which coordinates the fluid flow by a microscopic movement of piston. The servo-valve is a casting, usually made of ductile cast-iron that is necessary to machine. The functionality of hydrostatic circuits is influenced significantly by the precise movement of pistons.Therefore it is necessary to provide the dimension accuracy, machining quality and also the geometric...
Testing of Implant Prototype of Femoral Component Using Hydraulic Machine ZD40
Josef Sedlak, Martin Slany, Zdenek Fiala, Ales Jaros, Vendula Blazkova
Manufacturing Technology 2015, 15(3):416-423 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/416
An article deals with a realization and a statistical evaluation of a pressure test using a hydraulic testing machine ZD 40 in order to determine a strength of a designed implant prototype of a femoral component, more precisely a maximal force F that breaks a material and creates a crack. It is needed to make real testing samples of the new implant prototype of the femoral component for this purpose. Four pieces of testing samples are made in cooperation with the company in Velka Bites. Because of a price and availability in a range of offered cast materials testing samples are made of a bio tolerated cobalt alloy Co-Cr-Mo that is frequently implanted...
Deposition of Aluminium Oxide (Al2O3) Coatings on Aluminium Substrate Using Anodizing Processes
Frantisek Snahnican
Manufacturing Technology 2015, 15(3):423-428 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/423
The aim of this paper is to describe anodizing technology for deposition of Al2O3 coatings on Al substrates. Various methods of layer deposition were used for the experiments. Deposition was carried out in acidic environments, using sulphuric acid (H2SO4) and chromic acid (H2CrO4). Several samples were heat treated (annealed). Chemical composition of the substrate and the coating was tested by GDOS method using SA2000 and GDS 500A devices. Surface morphology and structure were evaluated by SEM, using VEGA5135 electron microscope. Selected mechanical properties as thickness, microhardness and adhesion were also determined.
Operational Risk Management and Treatment at Technical Systems with Maintenance Support
Martin Stavek, Zdenek Ales, Vaclav Legat, Adam Teringl
Manufacturing Technology 2015, 15(3):429-435 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/429
The purpose of this paper is to describe the area of risk management, in which maintenance can positively contribute to risk reduction and suggested reliability methods and maintenance tools can be used for risk treatment. The authors define the relationship between critical failure and risk and influence of preventive maintenance and redundancy on risk level. The risk level is defined as a product of critical failure probability and cost of critical failure losses. The proposed method enables to quantify risk treatment results. Benefits of the proposed risk treatment method based on preventive maintenance and redundancy applications are risk reduction...
The Modification of System for the Angle of Attack Setting at Roller Rig RAILBCOT
Veronika Štefaňaková, Lenka Valčáková
Manufacturing Technology 2015, 15(3):435-443 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/435
The aim of the article is to present suitable changes at the conception of the angle of attack setting mechanism and the modification of the spring element at the load module SIMRAIL, part of roller rig RAILBCOT which faithfully simulates the behavior of the vehicle on a real track. RAILBCOT is the acronym for RAIL vehicles Brake COmponents Test stand. During the measurements were recorded imperfections, which could influence continuous testing, and would lead not to reliable and fully trusworthy results. The article describes three steps to improve the situation. The first step describes the stabilization of the members to prevent the occurrence of...
Material Analysis of 120 mm Mortar Projectile Stabilizer
Zbyněk Studeny, Zdenek Pokorny, David Kusmič, Emil Svoboda
Manufacturing Technology 2015, 15(3):443-448 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/443
The article deals with the evaluation the state of 120 mm mortar projectile stabilizer. It assesses a crashed projectile, whose stabilizer got stuck in the barrel during the shot. The evaluation includes the analysis of the mechanical properties, especially hardness, besides the evaluation of cracks, structure and chemical composition of the materials used. Cracks are documented with Olympus GX 51 optical microscope and Tescan Vega TS 5135 electron microscope. The chemical composition was assessed by EDS method on the Noran System Six/300 device. The hardness values of the stabilizers were obtained by LECO LV800AT hardness tester, the microhardness...
Design of Experiments for CNC Turning
Stusek Jaromir, Macak Tomas
Manufacturing Technology 2015, 15(3):448-455 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/448
This paper follows on research on published in the Journal of the Academy of Business & Economics [1] (authors Hron and Macak) and complements previous research on the area of design of experiments using a factorial design. Further results are compared between Fuzzy Logic and Design of experiment approaches.The main purpose of this paper is to compare the results between the mathematical model of optimization of CNC turning and the optimization using the fuzzy-logic method for multi-criteria optimization of cutting conditions. The comparison in this paper verifies these two approaches. In the case of an inconsistency, the objective of this paper...
Dependability Characteristics - Indicators for Maintenance Performance Measurement of Manufacturing Technology
Adam Teringl, Zdeněk Aleš, Václav Legát
Manufacturing Technology 2015, 15(3):456-461 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/456
Authors define general dependability characteristics (reliability, maintainability, supportability and availability) and their measures. Further there is introduced method of data collection which shall be planned taking into account appropriate targets. Dependability data analysis needs clear understanding of an object, its operation, environment and physical attributes to be obtained required dependability measures which are described. These measures can be used as indicators for measuring maintenance impacts on reliability and maintainability. Data collection and its evaluation help to monitor the impact of maintenance on these indicators. Dependency...
Barkhausen Noise Emission of Surfaces after Laser Beam Machining
Alena Vajdova, Anna Micietova, Maria Cillikova, Miroslav Neslusan
Manufacturing Technology 2015, 15(3):462-468 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/462
This paper deals with analysis of surface integrity of steel after laser beam machining (LBM). The paper discusses surface integrity expressed in term of rms values of Barkhausen noise and reports about variables affecting Barkhausen noise emission such as laser power, gas pressure, thickness of machined surface, focus distance and feed speed. The paper demonstrates variable degree of surface hardening due to elevated temperatures and the following rapid cooling. Except magnetic investigation of surface also stress state and structure observation are reported. This study demonstrates that thickness samples takes major role from the point of surface...
Influence of Surface Treatment of Steel Adherends on Shear Strength of Filled Resins
Petr Valášek
Manufacturing Technology 2015, 15(3):468-474 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/468
Adhesion of resins and adhesives to adherend is one of the important characteristics, including the area where the resin or adhesive is filled with particulate fillers in order to optimize this adhesion, achieve other mechanical characteristics or in order to reduce the price of the resulting resin or adhesive. When discussing filled resins with particulate fillers, these materials can be defined as a polymer composite systems. Surface treatment of adherend before applying such a filled resin, is crucial to the overall strength of this interface. Blasting is commonly used kind of surface treatment of metal adherends. Properly chosen blasting conditions...
Test Stand Dynamics Properties Investigation by Means of Simulation Computations
Lenka Valčáková, Veronika Štefaňaková
Manufacturing Technology 2015, 15(3):474-483 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/474
The paper is devoted to the mechanical system dynamic properties investigation of the test stand RAILBCOT (RAIL vehicles Brake Components Test stand). Using sensors attached to some parts, have been measured values of positions, the longitudinal, vertical and transversal forces, revolutions and accelerations. There was created computational model of the mechanical system in SIMPACK software system environment. There were performed model establishment, starting and boundary condition setting and simulation computations to determine the dynamic properties parameters. The measured values were compared with calculated values. Subsequent verification has...
Question of Optimal Cutting Speed for Machining by Conventional and Coated Cutting Tools
Karol Vasilko, Zuzana Murčinková
Manufacturing Technology 2015, 15(3):483-490 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/483
The paper dealt with tool-wear, tool-life and chip creation regarding the cutting speed for machining by conventional and coated tools. The cutting speed is influenced by several parameters. The determination of optimal cutting speed is challenging question. Situation is more complicated in case of coated tools. The important is criterion of optimization. Moreover, the presence of the coating changes chip creation process and stress state during cutting. The paper provides complete experimental T-vc dependencies obtained in turning regarding various parameters as depth of cut, feed for different machined and cutting tool materials. Paper describes...
Analysis of Fiber Orientation Influence to Dynamic Properties of Composite Structures
Milan Žmindák, Zoran Pelagić, Jozef Soukup
Manufacturing Technology 2015, 15(3):490-494 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/490
In modern analysis of structures it is not only important to study structures subjected to static loading but also to study the effects of dynamic loading. One of the results of impact loading is the dynamic response of structures. This can cause far more damage than the effects of static loading. Composite materials are more and more used in engineering praxis. This allows the creation materials of high strength at low weight which are more durable then the same construction made of homogenous materials. This paper presents a study of dynamic response of carbon fiber reinforced polymer composite plates in the form of modal analysis and transient response...