Abstract
the influence of the cone semi-angle of various truncated conical punches on the limitation of formability in the hole-flanging process. Experimental results, using a low-carbon (BA _ CO2) sheet plate with a thickness of 1.18 mm, have been obtained and compared with the corresponding theoretical results. It was found that the limitation of formability during the forming process is not affected by the cone semi-angle of the truncated conical punch but the finish shape and maximum punch load are dependent on the cone semi-angle.
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