Editorial & Advisory Board - Acta Technica Corviniensis

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Engineering Hunedoara – International Journal of Engineering, Tome IX (Year 2011), Fascicule Extra (4), 203‐206 [11.] KISS, I., ALEXA, V., Statistical mathematic analysis and technological investigations in the area of the rolling mill rolls quality, Machine Design, 2, 2011, 79‐ 84 [12.] KISS, I., CIOATA, V.G., ALEXA, V., RATIU, S., Technological behavior of the quality assurance in some multidisciplinary approaches, paper presented at the 11th International Symposium Interdisciplinary Regional Research – ISIRR 2010, Szeged, Hungary, 2010 [13.] KISS, I., ALEXA, V., CIOATA, V.G., RATIU, S., Industrial and laboratory approaches for quality assurance in the rolling‐mill rolls manufacturing, paper presented at the 1st Regional Conference – Mechatronics in Practice and Education – Mech‐Conf 2011, Subotica, Serbia, 2011 [14.] MIHUȚ, G., POPA, E.M., Optimization of Manufacture Technology of Bimetals Milling Rolls through the Computer Simulations, International Symposium “Shape, Mechanical and Industrial Design of Products in Mechanical Engineering 2008” – KOD2008 [15.] BUDAGHIANȚ, N.A., KARSSKI, V.E. – Cast Iron Rolls, Editura Tehnică, Bucureşti, 1986 [16.] KISS, I., MAKSAY, St., Bimetallic Cast Iron Rolls – Some Approaches for assure the Exploitation ACTA TECHNICA CORVINIENSIS – Bulletin of Engineering Properties, Tehnicki Vjesnik‐Technical Gazette, 17(2), 2010, 173‐178 [17.] KISS, I., HEPUT, T., CIOATA, V.G., Some Interpretative Research in the Area of Cast Iron Rolls Quality Assurance, Acta Metalurgica Slovaca, 16 (1), 2010, 26‐ 33 [18.] KISS, I., HEPUT, T., ALEXA, V., Some Approaches Regarding the Quality Assurance in the Cast‐Iron Rolls Manufacturing, Acta Metalurgica Slovaca, 16 (1), 2010, 42‐49 [19.] KISS, I., CIOATA, V.G., ALEXA, V., Investigations in the Field of Indefinite Chill Rolls Manufacturing, Machine Design ‐ Monograph of Faculty of Technical Science, 1, 2009, 367‐372 [20.] KISS, I., CIOATA, V.G., Improving The Quality Assurance. Methodology for A Better Enterprise Data Adapted for the Rolling‐Mill Rolls Manufacturing Area, Acta Technica Jaurinensis – Series Logistica, 12, 2009, 449‐458 [21.] KISS, I., CIOATA, V.G., Some Technological Approaches in the Rolling Rolls Manufacturing, Technical Systems Operation – TSO 2009, Presov, Slovacia, 209, 124‐127 [22.] MIHUȚ, G., KISS, I., Researches Regarding the Bimetallic Milling Rolls Manufacturing Technology, Journal of Modern Manufacturing Technology, 1, 2009, 117‐128 ACTA TECHNICA CORVINIENSIS – BULLETIN of ENGINEERING ISSN: 2067‐3809 [CD‐Rom, online] copyright © UNIVERSITY POLITEHNICA TIMISOARA, FACULTY OF ENGINEERING HUNEDOARA, 5, REVOLUTIEI, 331128, HUNEDOARA, ROMANIA http://acta.fih.upt.ro 128 2012. Fascicule 2 [April–June]
1. Emil EVIN, 2. Miroslav TOMÁŠ, 3. Jozef VÝBOCH BENCHMARKING OF FRICTION MODELS USED IN THE SIMULATION SOFTWARE PAMSTAMP 2G BY STRIP DRAWN TEST 1. DEPARTMENT OF TECHNOLOGIES AND MATERIALS, FACULTY OF MECHANICAL ENGINEERING, TECHNICAL UNIVERSITY OF KOŠICE, MÄSIARSKA 74, 040 01 KOŠICE, SLOVAKIA ABSTRACT: Due to nature of the actual deformation process that taking place in each individual region of deep drawing it is important to define different values of friction coefficients in different regions at FEM modelling of sheet metal stamping processes. In this contribution analytical models for determination of friction coefficients under blankholder and also on die drawing edge by strip drawing test are presented. These models were verified by experimental strip test and FEM simulation under the same contact conditions. Zn coated IF steel sheet DX45D was applied for experimental and simulation research. KEYWORDS: deep drawing, strip drawn test, friction coefficient, simulation INTRODUCTION Formability of steel sheets depends on material properties (mechanical properties, microgeometry of contact surfaces), geometry and also microgeometry of contact surfaces of die, blankholder pressure, applied lubricant, etc. [1,2,3,4,5]. Accurate determination of the influence of individual parameters on technological characteristics is ambiguous because single parameters are changed from one case to another and their impact on formability is changed as well. It is possible to predict the influence of material properties, geometry of die, stamping conditions on sheet formability using simulation methods which enable us to optimize the utilization of material properties under specific conditions. With the increasing importance of the FEM analysis in preproduction, the need for exact values, which serve as input data for FEM simulation, is becoming more and more important. These input data are important for accurate description of material behaviour and contact conditions [10]. In order to predict sheet metal formability it is important to define the friction coefficient on the die contact surfaces. Friction conditions were the subject of the study [6,7,8]. To determine the friction coefficients for different combinations of surfaces and lubricants the different model (radial strip drawing friction test, pin‐on‐disc, etc.) and technological tests (cup test) that model the stressing of material in real stamping process have been used [5,8]. ANALYSIS OF FORCE RATIOS ON CONTACT SURFACES Stamping processes (deep drawing, stretching and bending) can be characterized by the types of contacts between the steel sheet and the die shown in Figure 1. The most frequently occurring types of contacts during stamping are shown in Figure 1a, b. In Figure 1a the strip is sliding between two die flat contact surfaces separated by lubricant. In Figure 1b there is shown the model of bending and also sliding of strip on die drawing edge. Figure 1. Types of contacts for deep drawing Figure 2. Scheme of forces at strip drawing. α ‐ wrapping angle of the die drawing edge (the bending angle of the blank around the die drawing edge) © copyright FACULTY of ENGINEERING ‐ HUNEDOARA, ROMANIA 129
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ACTA TECHNICA CORVINIENSIS - BULLET
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