Aluminum sheet with enhanced formability and an aluminum container made from aluminum sheet

Patent metadata

Field	Value
Publication number	US-10022773-B2
Application number	US-201715713203-A
Country	US
Kind code	B2
Filing date	Sep 22, 2017
Priority date	Apr 30, 2014
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

In some embodiments of present disclosure, a method includes: obtaining an aluminum sheet comprising a 3xxx or a 5xxx alloy having a tensile yield strength as measured in the longitudinal direction of 27-33 ksi and an ultimate tensile strength; wherein the ultimate tensile strength minus the tensile yield strength is less than 3.30 ksi (UTS-TYS<3.30 ksi); and forming a container having a dome from the aluminum sheet.

First claim

The invention claimed is:

1. A method comprising:
obtaining an aluminum sheet comprising a 3xxx or a 5xxx alloy; wherein the aluminum sheet has a tensile yield strength as measured in the longitudinal direction of 27-33 ksi and an ultimate tensile strength; wherein the ultimate tensile strength minus the tensile yield strength is less than 3.30 ksi (UTS-TYS<3.30 ksi); and wherein the aluminum sheet has a thickness of 0.006 inch to 0.030 inch;
drawing and ironing the aluminum sheet to form an aluminum container having a dome;
necking the aluminum container to reduce a diameter of a portion of the aluminum container to form a bottle; and
finishing the bottle so as to result in the bottle configured to accept a closure.

2. The method of claim 1 , wherein the tensile yield strength as measured in the longitudinal direction is 28-32 ksi.

3. The method of claim 1 , wherein the tensile yield strength as measured in the longitudinal direction is 28.53-31.14 ksi.

4. The method of claim 1 , wherein the ultimate tensile strength minus the tensile yield strength is 2.90-3.30 ksi.

5. The method of claim 1 , wherein the ultimate tensile strength minus the tensile yield strength is 2.99-3.30 ksi.

6. The method of claim 1 , wherein the aluminum sheet comprises one of AA: 3x03, 3x04 or 3x05.

7. The method of claim 1 , wherein the aluminum sheet comprises AA 3104.

8. The method of claim 1 , further comprising expanding a section of the portion of the aluminum container having the reduced diameter.

9. The method of claim 8 , wherein the section has a length and the length is at least 0.3 inches.

10. The method of claim 9 , wherein the length is at least 0.4 inches.

11. The method of claim 1 , wherein the aluminum sheet is a 3xxx alloy.

12. The method of claim 1 , wherein the 5xxx alloy is a 5043 alloy.

Assignees

• Alcoa Usa Corp

Inventors

• Rouns Thomas N
• Mcneish David J
• Capps Jean F
• Miller Christopher R

Classifications

• C22C21/06

  with magnesium as the next major constituent · CPC title

• C22C21/08

  with silicon · CPC title

• C22F1/047

  of alloys with magnesium as the next major constituent · CPC title

• C22F1/04 Primary

  of aluminium or alloys based thereon · CPC title

• B65D1/02 Primary

  Bottles or similar containers with necks or like restricted apertures, designed for pouring contents (thermally-insulated containers B65D81/38, A47J41/00; {feeding-bottles A61J9/00}) · CPC title