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

The Korean Society of Mechanical Engineers (대한기계학회)
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Evaluation of Formability and Mechanical Characteristic for Hot Forming Quenching in Sheet Forming of Al6061 Alloy

Al6061 판재성형에서 핫 포밍 ��칭의 성형성 및 기계적 특성 평가

  • Ko, Dae Hoon (Precision Manufacturing System Division, Pusan Nat'l Univ.) ;
  • Kim, Jae Hong (Precision Manufacturing System Division, Pusan Nat'l Univ.) ;
  • Lee, Chan Joo (Dongnam Regional Division, Korea Institute of Industrial Technology) ;
  • Ko, Dae Cheol (Industrial Liaison Innovation Center, Pusan Nat'l Univ.) ;
  • Kim, Byung Min (Dept. of Mechanical Engineering, Pusan Nat'l Univ.)
  • 고대훈 (부산대학교 정밀가공시스템) ;
  • 김재홍 (부산대학교 정밀가공시스템) ;
  • 이찬주 (부산대학교 IFAM 국제공동연구소) ;
  • 고대철 (부산대학교 부품소재산학협력연구소) ;
  • 김병민 (부산대학교 기계공학부)
  • Received : 2012.08.22
  • Accepted : 2012.12.05
  • Published : 2013.04.01
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Abstract

In aluminum sheet metal forming, the conventional forming methods of T4 or T6 heat-treated sheets result in low formability and dimensional accuracy. This study suggests a new forming method for aluminum sheets called as hot forming quenching (HFQ) that solves the problems faced in the conventional method. HFQ combines the heat treatment and forming processes through the forming die during the quenching of a solid solution. To evaluate the application of HFQ to the sheet forming of aluminum, an Erichsen and V-bending test are performed in this study to measure the dimensional accuracy and formability, which are then compared with those of the conventional forming method. Furthermore, the strength and hardness of the products formed by HFQ are measured to confirm the degradation in mechanical properties compared with the conventional forming method, which shows the validity of the application of HFQ to aluminum sheet metal forming.

알루미늄 소재의 냉간 판재성형에서는 낮은 성형성과 성형 후 과도한 스프링백에 의한 치수정밀도가 저감되는 문제가 있다. 이에 본 연구에서는 기존 제조공법의 문제점을 개선하기 위해 새로운 제조공법인 Hot forming quenching(HFQ)을 제시하고자 한다. HFQ 은 용체화처리 온도로 가열된 알루미늄 판재를 열간성형하고, 다이 내에 설치된 냉각채널에 의해 ��칭하여 열간성형과 열처리를 동시에 함으로써 성형성 향상, 스프링백 저감 효과를 얻을 수 있다. 기존의 냉간성형 대비 HFQ 의 성형성 향상효과를 에릭슨 시험을 통해 평가하였다. 스프링백 특성을 파악하기 위해 V-beding 시험에 HFQ 를 적용하여 굽힘 성형된 제품의 치수정밀도를 기존의 냉간성형과 비교하였다. 또한 강도 및 경도를 측정하여 기존 냉간 성형에 의한 값들과 비교함으로써 알루미늄 제품 성형에 HFQ 을 적용하기 위한 타당성을 평가하였다.

Keywords

References

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