| 摘要 |
The invention proposes a method for the integral moulding of a flange ( 5 ) onto the end of a round or oval pipe ( 11 ) of thin-walled sheet metal. This method takes place in two stages. In a first stage, for the purpose of accumulating material, a sectionally circular or spiral-shaped bead ( 17 ) is moulded on by means of a pre-forming roller tool ( 9 ), comprising a combination of rollers ( 13 to 15 ) (Figure a). In a second stage, the moulded-on bead is compacted with the aid of a final-forming roller tool ( 18 ), comprising the rollers ( 19 ) and ( 20 ), to produce an at least partly solid flange ( 5 ) (Figure b).
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