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

  • 제19권5호
  • /
  • Pages.98-104
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  • 2020
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  • 1598-6721(pISSN)
  • /
  • 2288-0771(eISSN)
한국기계가공학회 (The Korean Society of Manufacturing Process Engineers)
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상계법과 유한요소법을 이용한 확관금형 설계

Design of Pipe Expanding Die by Upper Bound Analysis and Finite Element Method

  • 조용일 (충북대학교 대학원 기계공학과) ;
  • 김승환 (충북대학교 대학원 기계공학과) ;
  • 추연근 (충북대학교 대학원 기계공학과) ;
  • 조해용 (충북대학교 대학원 기계공학과)
  • 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.)
  • 투고 : 2020.04.13
  • 심사 : 2020.05.08
  • 발행 : 2020.05.31
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초록

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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참고문헌

  1. Karrech, A., Seibi, A., "Analytical Model for the Expansion of Tubes under Tension," Journal of Materials Processing Technology, Vol. 6, No. 210, pp. 356-362, 2010. https://doi.org/10.1016/j.jmatprotec.2009.09.024
  2. Avitzur, B., Tube Sinking and Expanding, Journal of Engineering for Industry, pp. 71-79, 1965.
  3. Hong, S., Hyun, H., Hwang, J., "Study of Tube Expansion to Produce Hair-Pin Type Heat Exchanger Tubes using the Finite Element Method," Transactions of Materials Processing, Vol. 23, No. 3, pp. 164-170, 2014. https://doi.org/10.5228/KSTP.2014.23.3.164
  4. Kang, H. S., Kim, D. S., "Design of a Mandrel for Expansion of the Tube of the Heat Exchanger," In Proceedings of the KSME Conference The Korean Society of Mechanical Engineers, pp. 430-434, 2004.