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1. (WO1997016269) A METHOD FOR MAKING HOLLOW WORKPIECES
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What is claimed is:

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 dieε 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 degrees.

2. A method aε defined in claim 1 wherein the die angle iε less than about 5 degrees .

3. A method as defined in claim 1 wherein the aluminum alloy is strip cast by depositing molten aluminum alloy in a molding zone defined between a pair of endleεε beltε .

4. A method aε defined in claim 3 wherein each of the endless belts is mounted on an entry pulley whereby the belts define curved surfaces about the entry pulley and the molten metal is depoεited on the curved εurfaceε.

5. A method aε defined in claim 4 wherein each of the beltε iε cooled to remove heat tranεferred thereto by the molten metal or the caεt εtrip while the belts are not in contact with either the molten metal or the hot cast strip.

6. A method aε defined in claim 1 wherein the molten metal iε solidified prior to the nip defined by the endless belt.

7. A method as defined in claim 1 wherein the cast metal strip is subjected to a compressive force at the nip sufficient to effect elongation thereof whereby the caεt metal εtrip, after it paεses from the nip, iε in a εtate of
compression longitudinally along the length of the strip.

8. A method as defined in claim 1 wherein the ironing of the cup is carried out in the presence of a
lubricant.

9. A method as defined in claim 1 which includes the step of rolling the caεt metal strip before forming the strip into a cup.

10. A method aε defined in claim 1 wherein the cup iε passed through two ironing dies.

11. A method as defined in claim 10 wherein each of the two ironing dies has a die angle of leεε than about 6 degrees .

12. A method for making hollow workpieces with a circular die comprising:

(a) forming a strip of an aluminum alloy into a cup for the manufacture of a hollow workpiece;

(b) pasεing the cup through at leaεt two dieε
to iron the wallε of the cup and thereby lengthen the εide wallε of the cup and reduce their thickneεε with the die having a die angle of leεε than about 6
degrees and a chamfer angle of less than about 35
degrees ; and

(c) cooling the cup while it is paεεed through the die with a cooling fluid having lubricant
propertieε .

13. A method as defined in claim 12 wherein the die angle is lesε than about 5 degreeε.

14. A method as defined in claim 12 wherein the aluminum alloy is strip cast by depositing molten aluminum alloy in a molding zone defined between a pair of endlesε beltε .

15. A method as defined in claim 14 wherein each of the endlesε beltε iε mounted on an entry pulley whereby the beltε define curved surfaces about the entry pulley and the molten metal is deposited on the curved surfaces.

16. A method as defined in claim 15 wherein each of the belts iε cooled to remove heat tranεferred thereto by the molten metal or the caεt εtrip while the beltε are not in contact with either the molten metal or the hot caεt εtrip.

17. A method aε defined in claim 12 wherein the molten metal iε εolidified prior to the nip defined by the endless belt.

18. A method as defined in claim 12 wherein the cast metal strip is εubjected to a compreεεive force at the nip εufficient to effect elongation thereof whereby the cast metal strip, after it passes from the nip, is in a state of
compresεion longitudinally along the length of the εtrip.

19. A method as defined in claim 12 wherein the ironing of the cup is carried out in the preεence of a
lubricant.

20. A method aε defined in claim 12 which includes the step of rolling the caεt metal strip before forming the strip into a cup.

21. A method as defined in claim 12 wherein the cup is pasεed through two or three ironing dieε .

22. A method aε defined in claim 21 wherein each of the two ironing dieε haε a die angle of leεs than about 6 degrees .

23. A method is defined in claim 12 wherein the chamfer length iε greater than 0.120 inches and the chamfer angle is within the range of 20 to 30 degrees.

24. A method is defined in claim 12 wherein the chamfer and working surface of the die intersect, with the point of interεection being defined by a radiuε .

25. A method iε defined in claim 12 wherein a lubricant/coolant iε εupplied at an angle to the punch which iε substantially lesε than the chamfer angle, preferably at an angle between 8 and 20 degrees to the punch.

26. A method iε defined in claim 12 wherein the lubricant/coolant iε εupplied as a subεtantially annular continuouε εtream.

27. A method is defined in claim 26 wherein the stream is continuously swirling to maximize penetration of the lubricant/coolant to the space between the can wall and the die.