Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Design of Pipe Expanding Die by Upper Bound Analysis and Finite Element Method

상계법과 유한요소법을 이용한 확관금형 설계

  • Cho, Yong-Il (Dept. of Mechanical Engineering, Graduate School, Chungbuk Nat'l Univ.) ;
  • Kim, Seung-Hwan (Dept. of Mechanical Engineering, Graduate School, Chungbuk Nat'l Univ.) ;
  • Qiu, Yuan-gen (Dept. of Mechanical Engineering, Graduate School, Chungbuk Nat'l Univ.) ;
  • Cho, Hae-Yong (Dept. of Mechanical Engineering, Graduate School, Chungbuk Nat'l Univ.)
  • 조용일 (충북대학교 대학원 기계공학과) ;
  • 김승환 (충북대학교 대학원 기계공학과) ;
  • 추연근 (충북대학교 대학원 기계공학과) ;
  • 조해용 (충북대학교 대학원 기계공학과)
  • Received : 2020.04.13
  • Accepted : 2020.05.08
  • Published : 2020.05.31
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Abstract

Pipe expansion involves various methods to enlarge the diameter of the pipes with the use of a mandrel or punch placed inside the pipe. In this study, the upper bound method was used to analyze the pipe expanding process as well as design a die. A kinematically admissible velocity field was derived for the upper bound analysis with the occurrence of pipe thinning during the expansion factored in. The analysis confirms that a semi-cone angle of the punch between 15ween pip is most advantageous for pipe expansion. The results of the upper bound analysis, which were also consistent with those of the FEM, can be useful for the design of a pipe expansion die.

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References

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