Metalurgija 49 (2) 73

Z A G R E B
April / June
2 0 1 0

Metalurgija - Journal for Theory and Practice in Metellurgy

Metallurgy 49 (2) 73 - 144
PDF - 3004 kB

ISSN 1334-2576 UDC:669+621.7+51/54(05)=163.42=111 METABK: 49 (2) 73 - 144 (2010)

Original Scientific Paper

L'. Dorčák, J. Terpák,
I. Podlubný, L. Pivka

Methods for monitoring heat flow intensity in the blast furnace wall
abstract, article page 75 - 78 PDF - 278 kB

J. Terpák, L'. Dorčák,
F.I. Koštial, L. Pivka

Reduction of costs of iron production by changing parameters of the mixed blast-furnace wind
abstract, article page 79 - 82 PDF - 425 kB

R. Basan, M. Franulović,
S. Smokvina Hanza

Estimation of cyclic stress-strain curves for low-alloy steel from hardness
abstract, article page 83 - 86 PDF - 323 kB

I. Peruš, M. Fazarinc,
G. Kugler, P. Fajfar

On the influence of human factor on mechanical properties in aluminium hot extrusion process
abstract, article page 87 - 90 PDF - 2204 kB

F. Trebuna, F. Šimčák,
A. Gmiterko

Numerical and experimental modelling of carrying elements of heavy metallurgical equipments
abstract, article page 91 - 94 PDF - 3083 kB

Formal concept analysis applied to the prediction of additives for galvanizing process
abstract, article page 95 - 98 PDF - 86 kB

L. Jurišica, A. Vitko

Imbedding intellegence into mechatronic systems
abstract, article page 99 - 102 PDF - 447 kB

C. Kratochvíl, L. Houfek,
R. Grepl, V. Fuis

Analysis and modelling of dynamic properties of interactive drive system
abstract, article page 103 - 106 PDF - 229 kB

J. Ondrouch, P. Ferfecki,
Z. Poruba

Active vibration reduction of rigid rotor by kinematic excitation of bushes of journal bearings
abstract, article page 107 - 110 PDF - 282 kB

S. Aračić, D. Krumes,
I. Vitez

Tribocorrosion of low carbon steel C15E IN 5% NaCl and 5% NaCl + SiO₂
abstract, article page 111 - 114 PDF - 1341 kB

E. Krstić Vukelja,
I. Duplančić, B. Lela

Continuous roll casting of aluminium alloys - casting parameters analysis
abstract, article page 115 - 118 PDF - 472 kB

I. Samardžić, Z. Kožuh,
B. Mateša

Structural analysis of three-metal explosion joint: zirconium-titanium-steel
abstract, article page 119 - 122 PDF - 1486 kB

D. Bajić, S. Jozić,
S. Podrug

Design of experiment's application in the optimization of milling process
abstract, article page 123 - 126 PDF - 286 kB

Highly efficient models and simulations - the basis of design of mechatronic systems
abstract, article page 127 - 131 PDF - 270 kB

Obituary: Mijo Kundak (1939. - 2009.)
article page 132 PDF - 319 kB

3^rd International Conference "Modelling of the mechanics and mechatronics systems"
article page 133 - 134 PDF - 315 kB

Summaries of Abstracts
article page 135 - 144 PDF - 143 kB

Original Scientific Paper

L'. Dorčák, J. Terpák, I. Podlubný, L. Pivka - Methods for monitoring heat flow intensity in the blast furnace wall

In this paper we present the main features of an online system for real-time monitoring of the bottom part of the blast furnace. Firstly, monitoring concerns the furnace walls and furnace bottom temperatures measurement and their visualization. Secondly, monitored are the heat flows of the furnace walls and furnace bottom. In the case of two measured temperatures, the heat flow is calculated using multi-layer implicit difference scheme and in the case of only one measured temperature, the heat flow is calculated using a method based on application of fractional-order derivatives. Thirdly, monitored is the theoretical temperature of the blast furnace combustion process in the area of tuyeres.
PDF - 278 kB

J. Terpák, L'. Dorčák, I. Koštial, L. Pivka - Reduction of costs of iron production by changing parameters of the mixed blast-furnace wind

The blast-furnace wind from hot-blast stoves is a significant factor of the blast furnace functioning. The technology was analyzed in which the hot wind from hot-blast stoves is not mixed with the cool wind to a constant wind temperature, but is blown directly into the blast furnace. However, it is necessary to compensate for the changes of the theoretical temperature of burning in blast furnace as a consequence of non-stabilized wind temperature, by changing composition of the wind. This can be done by adding different media into the wind with different results from the operational and economical viewpoints. Essentially, the following types of media are used in blast furnaces: steam, oxygen, substitution fuels, nitrogen, and waste gas.
PDF - 425 kB

R. Basan, M. Franulović, S. Smokvina Hanza - Estimation of cyclic stress-strain curves for low-alloy steel from hardness

This article describes investigations into the existence of correlation between experimentally determined cyclic parameters and hardness of quenched and tempered representative low-alloy steel 42CrMo4. A good correlation was found to exist between cyclic strength coefficient K' and Brinell hardness HB, but not between cyclic strain hardening exponent n' and hardness HB. Nevertheless, good agreement between calculated and experimental cyclic stress-strain curves shows that cyclic parameters i.e. cyclic stress-strain curves of the investigated steel can be successfully estimated from its hardness.
PDF - 323 kB

I. Peruš, M. Fazarinc, G. Kugler, P. Fajfar - On the influence of human factor on mechanical properties in aluminium hot extrusion process

A non-parametric model was proposed for modelling the influence of different technological and chemical parameters on the mechanical properties of the 6082 aluminium alloys during the hot extrusion process with a special consideration of human factor. It was shown that human factor (influence of process engineers) was important and that it could be efficiently modeled and taken into account by the proposed Conditional Average Estimator (CAE) method. Production might be improved (optimized) by a proper education and/or by eliminating critical process engineers. It was found that the highest values for elongation and yield stress did not coincide with the range of the most frequent combinations of input parameters.
PDF - 2204 kB

F. Trebuna, F. Šimčák, A. Gmiterko - Numerical and experimental modelling of carrying elements of heavy metallurgical equipments

Carrying structures of heavy metallurgical equipments are during their operation often exposed to extreme loading. The short-term overloading of the structure results to high stresses in locations of their concentrations. By repeating of these phenomena is decreased the life-time of the structure and eventually this leads to local failures in their carrying elements. In the paper are on examples described advantages of using numerical and experimental methods of mechanical system modelling that is exploited for identification of overloading in carrying elements of metallurgical equipments or for detection of damage causes.
PDF - 3083 kB

J. Klimeš - Formal concept analysis applied to the prediction of additives for galvanizing process

Formal concept analysis is a new mathematical approach to data analysis, data mining and to discavering patterns in data. The result of the application of the formal concept analysis method to the behavior of the galvanizing of rimmed steel is presented. Effects of additives in the galvanizing process have been correlated to the chemical element properties of the additives. This model may also help to design new alloys as additives in the galvanizing process.
PDF - 86 kB

L. Jurišica, A. Vitko - Imbedding intellegence into mechatronic systems

An autonomously operating mechatronic system is an instantiation of an intelligent system. Its functionality relies on numerous disparate sensors through which the system grasps a consistent image of what is going on inside and around it. The paper describes the ways of embedding intelligence based on the means of information fusion and learning. The process is exemplified by intelligent navigation of a mobile machine. The feasibility of the chosen approach is demonstrated by both the simulation and real experiment.
PDF - 447 kB

C. Kratochvíl, L. Houfek, R. Grepl, V. Fuis - Analysis and modelling of dynamic properties of interactive drive system

The recent drive systems are considered as interactive systems containing a range of subsystems with different physical nature. This contribution deals with the modelling of mechatronic drive systems using numerical package DYNAST. The theoretical general observations are demonstrated on particular experiments on real system.
PDF - 229 kB

J. Ondrouch, P. Ferfecki, Z. Poruba - Active vibration reduction of rigid rotor by kinematic excitation of bushes of journal bearings

Possibilities of active lateral vibration reduction of a symmetric, rigid rotor supported by journal bearings are given. They were obtained by computational modelling. Efficiency of the feedback P and PD controllers in the stable revolution interval was examined. The linearized rotor system model was used. The results of the theoretical analysis are assigned for a testing stand where the bearing bush motions are deactivated by piezoelectric actuators connected to the controllers.
PDF - 282 kB

S. Aračić, D. Krumes, I. Vitez - Tribocorrosion of low carbon steel C15E IN 5% NaCl and 5% NaCl + SiO₂

The article represents testing results of corrosion and erosion-corrosion wear. Specimens have been made from low carbon steel C15E in four different states: delivery state and heat-treated (carburizing, boronising and carburizing + boronising). The results are shown as wear of materials (losing of surface mass in mg/(cm² · d)). Surface hardness method HV1 and micro hardness per section of specimen HV0,2 method have been used during the analyses. A comparison of testing results of wear in four different states was made. The best performances have shown samples which have been treated with duplex procedure (carburizing + boronising) as was predicted.
PDF - 1341 kB

E. Krstić Vukelja, I. Duplančić, B. Lela - Continuous roll casting of aluminium alloys - casting parameters analysis

The main goal of the paper was to present the influence of casting parameters on casting conditions and interference of casting parameters on the final strip characteristics such as constant strip thickness, surface quality and roughness of aluminum alloys sheet 6,30 to 6,50 mm thick. The study shows that casting speed, roll force and roll gap should have the greatest influence on the final strip thickness, and that the examined parameters agree well with the theoretical standpoints.
PDF - 472 kB

I. Samardžić, Z. Kožuh, B. Mateša - Structural analysis of three-metal explosion joint: zirconium-titanium-steel

The influence of applied explosion joining parameters on the structure and strength of three-metal joints: Zr-Ti-Steel is analyzed in this paper. Zirconium was explosively clad on steel over an inter-layer of titanium. Zirconium-titanium-steel joint is produced during simultaneous cladding operation using a single cladding shot and plan parallel joining scheme. The metallographic analysis of interfaces Zr/Ti and Ti/Steel structures and microhardness measuring are performed. Mechanical testing of bond strength is performed on both interfaces by shear strength examinations.
PDF - 1486 kB

D. Bajić, S. Jozić, S. Podrug - Design of experiment's application in the optimization of milling process

This paper examines the influence of cutting parameters on surface roughness of steel workpiece. The experiments have been carried out in accordance with a design of experiments (DOE). Equation for the surface roughness, as a function of cutting parameters, has been obtained by means of regression analysis. To obtain the minimal value of surface roughness, the equation optimizing was performed by using partial derivations and solving system of equations. The Taguchi method, with orthogonal arrays and signal to noise ratio, has been used to analyze impact of various cutting parameters on surface roughness and to find optimal levels of the cutting parameters. The comparison of results obtained by means of the response surface method and the Taguchi method was performed.
PDF - 286 kB

M. Valasek - Highly efficient models and simulations - the basis of design of mechatronic systems

The paper describes the efficient techniques for assembly of multidisciplinary simulation models and then the efficient techniques for their simulation. The current methods of assembly of multidisciplinary simulation models are co-simulation using existing simulation packages for one physical domain and uniform modelling by uniform language. The efficiency of simulation can be achieved besides advanced mathematical methods by parallelization, modification of the problem being solved and surprisingly by solving boundary mapping instead of mapping of variable time behavior.
PDF - 270 kB

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Z A G R E B April / June 2 0 1 0		Original Scientific Paper	Preliminary Note	Review
Z A G R E B April / June 2 0 1 0		Review Paper	Professional Paper	ARCHIVE 1996 - 2010

April / June 2 0 1 0 Top of Page		Original Scientific Paper	Preliminary Note	Review
April / June 2 0 1 0 Top of Page		Review Paper	Professional Paper	ARCHIVE 1996 - 2010

49 year issue	Metalurgija - Journal for Theory and Practice in Metellurgy
Metallurgy 49 (2) 73 - 144 PDF - 3004 kB	ISSN 1334-2576 UDC:669+621.7+51/54(05)=163.42=111 METABK: 49 (2) 73 - 144 (2010)

Authors	Original Scientific Paper
L'. Dorčák, J. Terpák, I. Podlubný, L. Pivka	Methods for monitoring heat flow intensity in the blast furnace wall abstract, article page 75 - 78 PDF - 278 kB
J. Terpák, L'. Dorčák, F.I. Koštial, L. Pivka	Reduction of costs of iron production by changing parameters of the mixed blast-furnace wind abstract, article page 79 - 82 PDF - 425 kB
R. Basan, M. Franulović, S. Smokvina Hanza	Estimation of cyclic stress-strain curves for low-alloy steel from hardness abstract, article page 83 - 86 PDF - 323 kB
I. Peruš, M. Fazarinc, G. Kugler, P. Fajfar	On the influence of human factor on mechanical properties in aluminium hot extrusion process abstract, article page 87 - 90 PDF - 2204 kB
F. Trebuna, F. Šimčák, A. Gmiterko	Numerical and experimental modelling of carrying elements of heavy metallurgical equipments abstract, article page 91 - 94 PDF - 3083 kB
J. Klimeš	Formal concept analysis applied to the prediction of additives for galvanizing process abstract, article page 95 - 98 PDF - 86 kB
L. Jurišica, A. Vitko	Imbedding intellegence into mechatronic systems abstract, article page 99 - 102 PDF - 447 kB
C. Kratochvíl, L. Houfek, R. Grepl, V. Fuis	Analysis and modelling of dynamic properties of interactive drive system abstract, article page 103 - 106 PDF - 229 kB
J. Ondrouch, P. Ferfecki, Z. Poruba	Active vibration reduction of rigid rotor by kinematic excitation of bushes of journal bearings abstract, article page 107 - 110 PDF - 282 kB

Home	Preliminary Note
S. Aračić, D. Krumes, I. Vitez	Tribocorrosion of low carbon steel C15E IN 5% NaCl and 5% NaCl + SiO₂ abstract, article page 111 - 114 PDF - 1341 kB
E. Krstić Vukelja, I. Duplančić, B. Lela	Continuous roll casting of aluminium alloys - casting parameters analysis abstract, article page 115 - 118 PDF - 472 kB
I. Samardžić, Z. Kožuh, B. Mateša	Structural analysis of three-metal explosion joint: zirconium-titanium-steel abstract, article page 119 - 122 PDF - 1486 kB
D. Bajić, S. Jozić, S. Podrug	Design of experiment's application in the optimization of milling process abstract, article page 123 - 126 PDF - 286 kB

Top of Page	Review Paper
M. Valasek	Highly efficient models and simulations - the basis of design of mechatronic systems abstract, article page 127 - 131 PDF - 270 kB

Top of Page	Other
J. Črnko	Obituary: Mijo Kundak (1939. - 2009.) article page 132 PDF - 319 kB
-	3^rd International Conference "Modelling of the mechanics and mechatronics systems" article page 133 - 134 PDF - 315 kB
-	Summaries of Abstracts article page 135 - 144 PDF - 143 kB