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1
Content available Application of Two Advanced Vision Methods Based on Structural and Surface Analyses to Detect Defects in the Erichsen Cupping Test
100%
Jasiński C. , Świłło S. , Kocańda A.
Archives of Metallurgy and Materials
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2019
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tom Vol. 64, iss. 3
1041--1049
EN
Due to the wide range of various sheet metal grades and the need to verify the material properties, there are numerous methods to determine the material formability. One of them, that allows quick determination of sheet metal formability, is the Erichsen cupping test described in the ISO 20482: 2003 standard. In the presented work, the results of formability assessment for DC04 deepdrawing sheet metal were obtained by means of the traditionally carried out Erichsen cupping test and compared with the resultsobtained by using two advanced methods based on vision analysis. Application of these methods allows extending the traditional scope of analysis during Erichsen cupping test by determination of the necking and strain localization before fracture. The proposed methods were compared in order to dedicate appropriate solution for the industrial application and laboratory tests respectively, where the simplicity and reliability are the mean aspects need to be considered when applied to the Erichsen cupping test.
2
Content available A New Approach to Experimental Testing of Sheet Metal Formability for Automotive Industry
100%
Jasiński C. , Kocańda A. , Morawiński Ł. , Świłło S.
Archives of Metallurgy and Materials
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2019
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tom Vol. 64, iss. 4
1231--1238
EN
Advanced vision method of analysis of the Erichsen cupping test based on laser speckle is presented in this work. This method proved to be useful for expanding the range of information on material formability for two commonly used grades of steel sheets: DC04 and DC01. The authors present a complex methodology and experimental procedure that allows not only to determine the standard Erichsen index but also to follow the material deformation stages immediately preceding the occurrence of the crack. Accurate determination of these characteristics in the sheet metal forming would be an important application, especially for automotive industry. However, the sheet metal forming is a very complex manufacturing process and its success depends on many factors. Therefore, attention is focused in this study on better understanding of the Erichsen index in combination with the material deformation history.
3
Content available The Effect Of Different Micro-Jet Streams Number On Plastic Properties Of Welds
63%
Hadryś D. , Węgrzyn T. , Piwnik J.
Archives of Metallurgy and Materials
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2015
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tom Vol. 60, iss. 3A
1617--1621
EN
The main goal of that paper was analysing of plastic properties of welds made with micro-jet cooling. New technology of micro-jet welding could be regarded as a new way to improve plastic properties of welds. It allows to obtain welds with better properties in comparison to ordinary welding method. Moreover, it is possible to steering of weld structure and properties of the weld. During research Erichsen cupping tests and bending tests were carried out for welds made by MIG method with micro-jet cooling. Argon was cooling medium. Different numbers of micro-jet streams were used to weld cooling. Different plastic properties were obtained for different numbers of micro-jet streams. In this research welds made by new method of welding (welding with micro-jet cooling) were compared with welds made by ordinary welding method.
PL
Głównym celem niniejszego artykułu jest przeanalizowanie własności plastycznych spoin wykonanych z chłodzeniem mikrojetowym. Ta nowa technologia spawania może być traktowana jako nowy sposób na poprawę własności plastycznych spoin. Umożliwia to uzyskanie spoiny o lepszych właściwościach w porównaniu z typowymi sposobami spawania. Ponadto, możliwe jest sterowanie strukturą i właściwościami spoiny. Dla spoin wykonanych metodą MIG z chłodzeniem mikrojetowym oraz zwykłych spoin wykonano próby tłoczności metodą Erichsena oraz badania przeginania. Jako czynnik chłodzący zastosowano argon. Spawanie z chłodzeniem mikrojetowym z różnymi liczbami mikro strug medium chłodzącego zostało użyte do przygotowania próbek. Różne właściwości plastyczne uzyskano dla różnej liczby mikro strug.
4
Content available remote Extended evaluation of Erichsen cupping test results by means of laser speckle
63%
Kocańda A. , Jasiński C.
Archives of Civil and Mechanical Engineering
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2016
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tom Vol. 16, no. 2
211--216
EN
Erichsen cupping test has usually been used to determine the height of the cup at the moment of sheet metal fracture, defined as the Erichsen Number IE. The paper presents a proposal of using Erichsen cupping test to determine the additional parameter – the height of the cup LN-IE at the moment of localized necking in sheet metal, which usually precedes fracture of sheet metal. For this purpose, a method of localized necking detection was developed. It is based on the phenomenon of laser speckle. The results of height measurements were presented for three different grades of sheet metals used in the automotive industry: 5754 H22 aluminum alloy, DC04 deep drawing steel, and Dogal 800DP high strength steel. The differences in cup heights at the moments of localized necking (LN-IE) and fracture (IE) of the tested sheet metals were in the range of 0–8%.
5
Application of laser speckles to localized necking and cracking detection in Erichsen cupping test
63%
Jasiński C. , Kocańda A.
Przegląd Mechaniczny
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2014
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tom nr 9
49--54
EN
This paper deals with a measurement method based on the laser speckles phenomenon to detect localized necking and cracking of sheet metal in Erichsen cupping test. The vision system was used for the measurement of sample height. The proposed method was verified and the results of Erichsen cupping test for sheet metal grade DC04 were presented.
PL
W artykule przedstawiono metodę pomiarową wykorzystującą zjawisko plamkowania do detekcji powstającej bruzdy i pękania materiału w próbie tłoczności blachy metodą Erichsena. Przedstawione zostało stanowisko wizyjne, które umożliwia pomiar wysokości wytłaczanej próbki wraz z detekcją bruzdy i pęknięcia. Zaprezentowany został sposób weryfikacji zaproponowanej metody oraz wyniki pomiarów w próbie tłoczności metodą Erichsena dla blachy DC04.
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