• Title, Summary, Keyword: 홀 플랜징

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Effect of Lip Shape on the Hole Flangeability of High Strength Steel Sheets (고강도 열연재의 홀 플랜징시 립 형상이 플랜정성에 미치는 효과)

  • Kim, Jeong-Un;Kim, Bong-Jun;Mun, Yeong-Hun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.1
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    • pp.147-152
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    • 2002
  • Effect of lip shape on the hole flangeability of high strength steel sheets is investigated. Circular plates of various hole sizes are tested and the variation of lip length as well as the variation of thickness on the sectional views of the finished lip were studied. The conventional hole flanging process is limited to a certain limit hole diameter below which failure will ensue during the hole expansion. The intention of this work is to examine the effect of lip shape on the flangeability of TRIP steel and Ferrite-Bainite duplex steel and find out major parameters which can affect flanging shape of high strength hot rolled steels. Over the ranges of conditions investigated, the minimum hole diameter of F+B steel is better than TRIP steel. while, the lip-shape accuracy of TRIP steel is better than that of F+B steel. although the tensile strength and elongation of %P steel are superior than those of Ferrite-Bainite duplex steel, the flangeability is found to be not so strongly sensitive to the tensile properties but sensitive to displacement on the circumferential direction of hole edge.

Development of Hole Expansion Test for Sheet Materials Using Pattern-Recognition Technique (형태 인식 기술을 이용한 판재의 홀 확장성 평가 시스템 개발)

  • Jang, Seung Hyun;Kim, Chan Il;Yang, Seung Han;Kim, Young Suk
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.2
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    • pp.161-168
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    • 2013
  • Nowadays, one of the most interested area of automobile industry is the production of vehicle which has collision safety and ability to produce less amount of $CO_2$. The achievement of such a dual performance is done by choosing the materials like dual phase steel, ferrite bainite steel, etc. These steels have been used in automotive chassis and body parts, and also used to be formed by hole flanging to meet the goal of strength and design requirement. The formability of sheet material was experimented by hole expansion test and the judgement relies on human eye and his experience. This manual judgement involves many errors and large deviation. This paper develops the automatic crack recognition system which finds a crack based on CCD image to complement the problem of the current method depending on human's sense.