Method for making hollow workpieces
First Claim
Patent Images
1. A method for making hollow workpieces with a circular die comprising:
- (a) strip casting aluminum alloy to rapidly solidify the alloy without substantial precipitation of alloying elements and forming a cast strip;
(b) forming the strip into a cup for the manufacture of a hollow workpiece; and
(c) passing the cup through one or more dies to iron the walls of the cup and thereby lengthen the side wall of the cup to form a hollow workpiece, at least one of the dies having a die angle of less than about 6°
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3 Assignments
0 Petitions
Accused Products
Abstract
A method for making hollow workpieces such as beverage containers with a circular die in which an aluminum alloy is strip cast whereby the alloy is solidified rapidly without substantial precipitation. Thereafter, the aluminum alloy is formed into a cup which is drawn and passed through one or more dies to iron the walls of the cup and thereby lengthen the side walls thereof using at least one circular die having a die angle of less than about 6°. It has been found that the use of such small die angles prevents or minimizes galling and tearoffs.
25 Citations
19 Claims
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1. A method for making hollow workpieces with a circular die comprising:
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(a) strip casting aluminum alloy to rapidly solidify the alloy without substantial precipitation of alloying elements and forming a cast strip; (b) forming the strip into a cup for the manufacture of a hollow workpiece; and (c) passing the cup through one or more dies to iron the walls of the cup and thereby lengthen the side wall of the cup to form a hollow workpiece, at least one of the dies having a die angle of less than about 6°
. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for making hollow workpieces with a circular die comprising:
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(a) strip casting aluminum alloy to rapidly solidify the alloy without substantial precipitation of alloying elements and forming a cast strip; (b) forming the strip into a cup for the manufacture of a hollow workpiece; and (c) passing the cup through only two dies to iron the walls of the cup and thereby lengthen the side wall of the cup to form a hollow workpiece. - View Dependent Claims (13, 14)
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15. A method for making hollow workpieces with a circular die comprising:
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(a) forming an aluminum strip; (b) forming the strip into a cup which has a bottom and side walls; and (c) passing the cup through one or more dies to iron and lengthen the side walls of the cup to form a hollow workpiece, at least one of the dies has a die angle of less than 6°
. - View Dependent Claims (16, 17, 18, 19)
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Specification
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Current AssigneeAlcoa Incorporated (Howmet Aerospace, Inc.)
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Original AssigneeKaiser Aluminum & Chemical Corporation (Kaiser Aluminum Corporation)
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InventorsSun, Tyzh-Chiang
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Primary Examiner(s)Arbes, Carl J.
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Application NumberUS08/553,080Time in Patent Office1,180 DaysField of Search29/527.7, 29/527.5, 29/33 C, 164/481, 72/349US Class Current29/527.7CPC Class CodesB21D 22/201 Work-pieces; preparation of...B21D 22/28 of cylindrical articles usi...B21D 22/286 with lubricating or cooling...B21D 37/16 Heating or coolingB22D 11/0605 formed by two belts, e.g. H...Y10T 29/49988 Metal castingY10T 29/49991 Combined with rollingY10T 29/5184 Casting and working
