Blanking and forming tapered wall articles

Details Blanking and forming tapered wall articles Blanking and forming tapered wall articles

B - Operations, Transporting

21

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113/69

B21D 22/20 (2006.01) B21D 22/21 (2006.01) B21D 24/00 (2006.01) B21D 35/00 (2006.01) B21D 51/54 (2006.01)

Patent

CA 1081549

Abstract of the Disclosure Elongated, thin wall shells are formed from substan- tially circular blanks cut from sheet material by steps including providing a blank in a blank holder on a die having an effective entrance and exit aperture, the entrance aperture having an extent substantially commensurate in size with the size of the blank to be drawn, the die having a cavity, the wall of which converges inwardly from the entrance aperture to the effective exit aperture. The wall connecting the entrance and exit aper- tures is defined by an arc of a sector of a circle, the sector having an angle in the range of 12 to 34°. The thin wall shell is formed by displacing the blank through the die by action of a punch.

316023

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