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

The Korean Society of Mechanical Engineers (대한기계학회)
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Investigation of Cracking Condition during Press Forming of Extruded Aluminum Sheets

알루미늄 압출판재의 프레스성형 중 파열조건에 대한 조사

  • Chu, Seok Jae (School of Mechanical Engineering, Univ. of Ulsan) ;
  • Park, Chang Gu (School of Mechanical Engineering, Univ. of Ulsan) ;
  • Cho, Eun Hwa (School of Mechanical Engineering, Univ. of Ulsan)
  • 주석재 (울산대학교 기계공학부) ;
  • 박창구 (울산대학교 기계공학부) ;
  • 조은화 (울산대학교 기계공학부)
  • Received : 2013.06.24
  • Accepted : 2013.11.19
  • Published : 2014.03.01
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Abstract

Sunroof tracks are manufactured by press-forming extruded aluminum sheets. During press forming, cracking occurs along the sharply bent edge. The final positions of the punch and die were measured on the section, and their relation to cracking was investigated. Finite element simulation of bending to the final position was done to find the critical strains. Three-point bending tests with different material orientations, hardnesses, bending edge lengths, and bending radii were carried out in the laboratory, and finite element simulation of the three-point bending tests was performed to find the critical strains.

선루프 트랙은 알루미늄을 압출하고 프레스성형하여 생산한다. 프레스성형 중 날카롭게 굽혀진 좌면의 가장자리를 따라 균열이 발생하였다. 좌면의 가장자리를 절단하여 펀치와 다이 모서리의 최종위치를 측정하고 균열발생과의 관계를 조사하였다. 그리고, 이 최종위치까지 굽힘을 유한요소 시뮬레이션하여 임계변형률을 구하였다. 한편, 소재의 방향, 경도, 굽힘 가장자리 길이, 굽힘반경의 여러 가지 다른 조합에 대하여 3점굽힘시험을 수행하였다. 그리고, 3점굽힘시험에 대한 유한요소 시뮬레이션을 수행하여 임계변형률을 구하여 비교하였다.

Keywords

References

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