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조용일(Yong-Il Cho),김승환(Seung-Hwan Kim),추연근(Yuan-gen Qiu),조해용(Hae-Yong Cho) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.5
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.