Metal deforming – With 'coating' of work – Metal coating
Patent
1982-02-11
1984-07-03
Crane, Daniel C.
Metal deforming
With 'coating' of work
Metal coating
72349, B21D 2228
Patent
active
044571500
ABSTRACT:
Drawn and ironed can bodies are formed from cold rolled steel sheet having a thin coating of a nickel-zinc alloy electroplated thereon by drawing the coated steel into a cup and ironing the sidewall of the cup on a mandrel by passing it through a toolpack comprising a plurality of ironing rings each including a generally conical lead-in surface having an angle relative to the axis of the mandrel within the range of 6.degree. to 81/2.degree. and a substantially cylindrical land extending no more than about 0.025 inches in the axial direction of the toolpack through the rings. The diameter of the land on successive ironing rings is progressively smaller in the direction of movement of the can through the toolpack, with the diameter of the final ironing ring being such as to reduce the sidewall of the cup to about one half its original thickness. The length of the land of the final ironing ring may be less than that of the previous ironing rings and preferably is within the range of 0.003 to 0.007 inches.
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Austin Lowell W.
Bingle William D.
Saunders William T.
Smith John R.
Crane Daniel C.
Jones David B.
National Steel Corporation
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