| 摘要 |
A conventional press of high capacity has three sets of dies therein to form an ironing board in three stages, blank and draw in the first stage, flange embossment and pre-curl in the second stage, and finish curl in the third stage. Co-operating slide-mounted dies and rocker-mounted dies are provided in the second stage and operated by cams on the press ram-mounted section of the die set for simultaneously embossing and pre-curling the skirt portion around the entire perimeter of the part. In the third stage, a locating cavity with a bottom wall of circular cross section receives the pre-curled lower edge of the skirt and forms the finished curl thereon as the press closes.
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