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Optimal Process Planning of CNG Pressure Vessel by Ensuring Reliability and Improving Die Life

CNG 압력용기의 최적 공정설계를 통한 공정의 신뢰성 확보 및 다이 수명 향상

  • Bae, Jun Ho (School of Mechanical Engineering, Pusan Nat'l Univ.) ;
  • Lee, Hyun Woo (Research Institute of Mechanical Technology, Pusan Nat'l Univ.) ;
  • Kim, Moon Saeng (School of Mechanical Engineering, Pusan Nat'l Univ.) ;
  • Kim, Chul (Research Institute of Mechanical Technology, Pusan Nat'l Univ.)
  • 배준호 (부산대학교 기계공학부) ;
  • 이현우 (부산대학교 기계기술연구원) ;
  • 김문생 (부산대학교 기계공학부) ;
  • 김철 (부산대학교 기계기술연구원)
  • Received : 2012.12.27
  • Accepted : 2013.05.27
  • Published : 2013.07.01

Abstract

The deep drawing and ironing (DDI) process involving the use of a high-capacity horizontal press is used for manufacturing acompressed natural gas (CNG) pressure vessel. However, some variables of the DDI process have been determined based on the experiences of workers, and the short die life needs to be improved for manufacturing the pressure vessel withhighquality and lowcost. In this study, process variables such as the draw ratio, distance between dies, radius of rounding of drawing die, and angle of ironing die are chosen to enhance the reliability and improve the die life based on previous studies and experiences. The draw ratio limits at which no tearing or wrinkling occurs are determined using FEA, and the distances between dies, radius of rounding of drawing die, and angle of ironing die are optimized by the DOE method. The results of the optimal process variables are compared with those of the existing DDI process for verifying their effectiveness.

Keywords

Deep Drawing & Ironing;CNG;Pressure Vessel;Process Design;Wear of Die;FEA

Acknowledgement

Supported by : 부산대학교

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