B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
26/176, 113/66
B21D 22/20 (2006.01) B21D 19/08 (2006.01) B21D 41/02 (2006.01) B21D 51/10 (2006.01)
Patent
CA 1059839
ABSTRACT Process and apparatus for making a metal annular member of pre- cise tolerances and desired surface finish. An external die has a continuous die surface of the configuration desired for the ex- ternal surface of the metal annular member and an annular ridge sur- rounding the inside of the die for seating one end of an annular sheet metal blank. A first punch engages the sheet metal blank and drives it into the external die so as to reduce the external diameter of the blank and seat it against the ridge. The precise tolerance of the die surface of the external die determines both the external and at least a portion of the internal dimensions pro- duced in the annular sheet metal blank. The first punch is axially movable to an endmost position wherein substantially all of the blank has been forced into the die. An ejector punch is positioned inside of the external die and operates to provide a portion of the forming die surfaces as well as to eject the completed workpiece.
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