Abstract: Corrugated sheet is produced by initially forming a corrugation running to the edge of the sheet between a pair of stamping dies or platens, whereupon at least at one end of the corrugation, end pieces with integrated cylinders displace respective rams to flatten the corrugation into the original plane of the workpiece to form plane parallel edge surfaces allowing straight edges of the sheet to be welded to adjacent sheets.
Abstract: A press for forming an annular membrane of stainless steel strip joined at its ends, utilizes a rubber ram which is compressed by the pressing force between upper and lower plate of the press. The vertical force applied to the rubber ram is converted into a horizontal expansion of the latter to displace the membrane blank into a die having a bellows shape.
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