Method and conversion apparatus for the conversion into a...

Details Method and conversion apparatus for the conversion into a... Method and conversion apparatus for the conversion into a...

B - Operations, Transporting

21

D

113/57

B21D 22/00 (2006.01) B21D 19/04 (2006.01)

Patent

CA 1336555

An upstanding collar is formed around a hole in a sheet metal blank by means of a converter tool which converts an edge region bordering the hole into the collar, while the blank is rotated relative to the converter tool. This method comprises (i) in a first stage, converting a portion of said blank into a first turned-up rim, (ii) after said first stage, converting a further portion of said blank into a second turned-up rim, (iii) in at least one further stage repeating step (ii) successively converting each time a further portion of the blank into another turned-up rim, until the whole of said edge region has been converted, wherein (a) in at least one of said stages the conversion takes place on free air, and (b) in all said stages the conversion takes place in the same direction relative to the blank. A converter tool increasing stepwise in diameter may be used.

591149

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