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

The Korean Society of Mechanical Engineers (대한기계학회)
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Joining High-Strength Steel and Al6061 Sheet Using Hole Clinching Process

Hole 클린칭을 이용한 고장력강판과 Al6061 이종소재의 접합

  • Ahn, Nam-Sik (Dept. of Mechanical Engineering, Pusan Nat'l Univ.) ;
  • Lee, Chan-Joo (PNU-IFAM Joint Research Center) ;
  • Lee, Jung-Min (Dongnam Regional Division, Korea Institute of Industrial Technology) ;
  • Ko, Dae-Cheol (PNU-Industrial Liaison Innovation Center, Pusan Nat'l Univ.) ;
  • Lee, Seon-Bong (Faculty of Mechanical and Automotive Engineering, Keimyung Univ.) ;
  • Kim, Byung-Min (Dept. of Mechanical Engineering, Pusan Nat'l Univ.)
  • 안남식 (부산대학교 기계공학부) ;
  • 이찬주 (부산대학교 IFAM 국제공동연구소) ;
  • 이정민 (한국생산기술연구원 동남권지역본부) ;
  • 고대철 (부산대학교 부품소재산학협력연구소) ;
  • 이선봉 (계명대학교 기계자동차공학과) ;
  • 김병민 (부산대학교 기계공학부)
  • Received : 2011.08.08
  • Accepted : 2012.03.28
  • Published : 2012.06.01
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Abstract

The joining of aluminum and HSS (high-strength steel) by the conventional clinching process is limited by the low formability of HSS. Defects in the clinching joint, such as necking of the upper sheet, cracks, and lack of interlocking, are produced by the different ductility properties of HSS and aluminum. In this study, we propose the hole clinching process for joining Al6061 and SPFC440, in which deformation of SPFC440 is avoided by drilling a hole in the SPFC440. The dimensions of the interlocking in the hole-clinched joint necessary to provide the required joint strength were determined. Based on the volume constant of the hole clinching process, the shapes of the tools were designed by finite element (FE)-analysis. A hole clinching experiment was performed to verify the proposed process. A cross-section of the joint showed good agreement with the results of the FE-analysis. The lap shear strength was found to be 2.56 kN, which is higher than required joint strength.

일반적인 클린칭 접합공정에서 고장력강과 알루미늄의 이종소재간의 접합시 고장력강의 낮은 연신율과 높은 강도로 인해 클린칭 접합시 파단이 발생하거나 높은 클린칭 접합하중이 요구된다. 이러한 문제점을 해결하기 위해 본 연구에서는 클린칭 접합시 고장력강의 변형없이 알루미늄의 변형만을 이용한 홀 클린칭 접합공정을 개발하였다. 고장력강에 홀가공을 적용하여 고장력강의 변형을 배제하였다. 홀 클린칭 접합의 요구접합강도를 기초로 클린칭 접합의 기하학적 구속량을 결정하였으며, 홀 클린칭 금형의 형상은 성형체적 일정조건을 이용하여 설계하였다. 설계된 클린칭 접합공정의 유효성을 평가하기 위해 유한요소해석을 수행하여, 홀 클린칭 접합이 가능함을 확인하였다. 또한 홀 클린칭 접합의 접합강도는 인장전단시험을 통하여 평가하였다. 홀 클린칭 접합강도는 2.56kN으로 요구접합강도와 비교하여 동등수준 이상의 값을 가짐을 확인하였다.

Keywords

References

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  3. Clinching process for joining dissimilar materials: state of the art vol.82, pp.1-4, 2016, https://doi.org/10.1007/s00170-015-7363-0
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