Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Prediction of Formability of Aluminum Alloy 5454 Sheet

알루미늄 5454 합금 판재의 성형성 예측

  • Kim, Chan-Il (Institute of Mechanical Engineering Technology, Kyungpook Nat'l Univ.) ;
  • Yang, Seung-Han (Dept. of Mechanical Engineering, Kyungpook Nat'l Univ.) ;
  • Kim, Young-Suk (Dept. of Mechanical Engineering, Kyungpook Nat'l Univ.)
  • Received : 2011.09.16
  • Accepted : 2011.11.25
  • Published : 2012.02.01
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Abstract

In the automobile industry, reducing the weight is the most important objective for reducing air pollution and improving the fuel efficiency. For this reason, the application of aluminum sheets is increasing. When the sheets are applied to the automobile, using inappropriate variables for the material, product design, and press processing can generate tearing, wrinkling, and spring-back problems, which are the main types of failure in the manufacturing process. Therefore, it is necessary to reduce these failures by harmonizing the many variables and strictly managing the processes. In this research, we study the theoretical plasticity instability of Al5454 and obtain the forming limit diagram (FLD) using MATLAB. Moreover, we compare the theoretical FLD with an experimental FLD obtained from a stretching test.

자동차 산업에서 대기오염을 줄이고 연비를 향상시키기 위해 경량화가 중요한 과제로 여겨지고 있다. 이를 위해 알루미늄 소재의 적용이 증가하고 있다. 판재를 차체에 적용하기 위해서는 주로 프레스 가공 공정을 거치게 된다. 이때, 재료, 제품설계 및 프레스 공정의 부적절한 가공 변수의 사용으로 인하여 파단, 주름, 및 스프링 백 등에 의한 다양한 형태의 가공 불량이 발생한다. 따라서 이들 변수들의 적절한 조화 뿐 만 아니라 엄격한 공정 관리가 요구된다. 이에 본 연구에서는 자동차 판재에 주로 사용되는 Al5454 재료에 대한 이론적으로 유도한 소성 불안정 조건을 구하고, MATLAB을 이용하여 성형 한계도를 도출하였다. 또한, 장출 인장 실험을 통해 얻어진 실험값과 이론적으로 도출한 성형 한계도와의 비교를 수행하였다.

Keywords

References

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