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

The Korean Society of Mechanical Engineers (대한기계학회)
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Study of Hot Spinning Process for Head of CNG Storage Vessel

CNG 저장용기의 두부 성형을 위한 열간스피닝 공정에 관한 연구

  • Lee, Hyun Woo (Creative Engineering System, Pusan Nat'l Univ.) ;
  • Jung, Sung Yuen (Research Institute of Mechanical Technology, Pusan Nat'l Univ.) ;
  • Kim, Chul (Research Institute of Mechanical Technology, Pusan Nat'l Univ.)
  • 이현우 (부산대학교 창의공학시스템) ;
  • 정성윤 (부산대학교 기계기술연구원) ;
  • 김철 (부산대학교 기계기술연구원)
  • Received : 2012.11.12
  • Accepted : 2013.01.10
  • Published : 2013.04.01
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Abstract

The fuel storage vessel installed in CNG vehicles can be largely divided into 3 parts: head, cylinder, and dome. Studies of the cylinder and dome parts have already been performed, but sufficient design data is not available about the head part. Therefore, expert field engineers heavily depend upon trial-and-error methods. Therefore, FE analysis is performed to review the hot spinning process for forming the head part of the CNG vessel using the Arbitrary Lagrangian-Eulerian (ALE) method. The effects of forming factors on the load were analyzed. The values of the factors were chosen to avoid defects in the head part and buckling, and the forming feasibility of the head part was investigated. Furthermore, a bursting test was performed to evaluate the safety of the storage vessel.

천연가스 자동차에 장착되는 연료저장용기는 크게 두부, 실린더부 그리고 바닥부로 나뉜다. 실린더부와 바닥부에 관한 연구는 이미 충분히 수행되었으나, 두부 성형에 관한 연구 및 설계자료는 전무한 실정이며, 현재 현장 작업자들의 경험이나 시행착오에 의해 제작되고 있다. 본 연구에서는 천연가스 저장용기의 두부 성형 공정인 열간스피닝 공정 분석을 위하여 회전체 소성가공에 적합한 ALE method를 적용하여 유한요소해석을 수행하였다. 성형인자들(이송거리, 성형시간, 소재의 온도, 회전속도)이 성형롤러의 하중 및 두부의 좌굴에 미치는 영향을 분석하고, 이를 토대로 저장용기의 두부성형 가능성을 검토하였다. 또한 성형해석 결과로 제조된 저장용기 두부의 안전성을 평가하기 위하여 파열압력에 대한 용기의 구조해석 및 실험을 수행하였다.

Keywords

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