Optimization of aluminum hot working

Patent metadata

Field	Value
Publication number	US-10472708-B2
Application number	US-201615276955-A
Country	US
Kind code	B2
Filing date	Sep 27, 2016
Priority date	Oct 8, 2015
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

A method of hot forming an aluminum alloy component may include heating the aluminum alloy component in a heating furnace to a solutionizing temperature, cooling the aluminum alloy component to a desired forming temperature, deforming the aluminum alloy component into a desired shape in a forming device while the aluminum alloy component is at the desired forming temperature, maintaining a constant temperature during the deformation of the aluminum alloy component, and quenching the aluminum alloy component to a low temperature below a solvus temperature.

First claim

That which is claimed is:

1. A method of hot forming an aluminum alloy component, the method comprising:
heating the aluminum alloy component in a heating furnace to a solutionizing temperature;
cooling the aluminum alloy component to a desired forming temperature in a range of approximately 380° C. to approximately 470° C.;
deforming the aluminum alloy component into a desired shape in a forming device while the aluminum alloy component is at the desired forming temperature, wherein the aluminum alloy component is transferred from the heating furnace to the forming device through an insulated enclosure; and
quenching the aluminum alloy component to a low temperature below a solvus temperature, wherein the low temperature is in a range of approximately 0° C. to approximately 280° C.

2. The method of claim 1 , wherein the aluminum alloy component comprises a 7xxx alloy.

3. The method of claim 1 , wherein the aluminum alloy component comprises a 7075 alloy.

4. The method of claim 1 , wherein the desired forming temperature is in a range of approximately 400° C. to approximately 440° C.

5. The method of claim 1 , wherein the solutionizing temperature is in a range of approximately 400° C. to approximately 600° C.

6. The method of claim 1 , wherein the solutionizing temperature is approximately 480° C.

7. The method of claim 1 , wherein the heating of the aluminum alloy component to the solutionizing temperature occurs in a range of approximately 10 seconds to 15 minutes.

8. The method of claim 1 , wherein the heating of the aluminum alloy component to the solutionizing temperature occurs in approximately 5 minutes.

9. The method of claim 1 , wherein the aluminum alloy component comprises an approximate grain size of 65-85 microns, wherein the approximate grain size is measured after the aluminum alloy component is heated to the solutionizing temperature.

10. The method of claim 1 , further comprising artificially aging the aluminum alloy component.

11. The method of claim 1 , further comprising maintaining a constant temperature during the deformation of the aluminum alloy component, wherein the constant temperature is held to within ±10° C.

12. The method of claim 1 , wherein:
the aluminum alloy component is an ingot;
the forming device is a rolling mill; and
the desired shape is a plate or a sheet.

13. The method of claim 1 , wherein the forming device is a forming press.

14. The method of claim 1 , further comprising maintaining the aluminum alloy component at the solutionizing temperature for a predetermined time, wherein the predetermined time is up to approximately 30 minutes.

15. The method of claim 1 , wherein the quenching comprises die quenching with water flowing internally through a die such that the aluminum alloy component is cooled at a rate between approximately 50° C./second and approximately 500° C./second.

16. A method of hot forming an aluminum alloy component, the method comprising:
heating the aluminum alloy component in a heating furnace to a solutionizing temperature of approximately 480° C.;
cooling the aluminum alloy component to a desired forming temperature in a range of approximately 400° C. to approximately 440° C.;
deforming the aluminum alloy component into a desired shape in a forming device while the aluminum alloy component is at the desired forming temperature, wherein the aluminum alloy component is transferred from the heating furnace to the forming device through an insulated enclosure;
maintaining a constant temperature during the deformation of the aluminum alloy component, wherein the constant temperature is held within ±10° C.; and
quenching the aluminum alloy component to a low temperature below a solvus temperature, wherein the low temperature is approximately 23° C.

17. The method of claim 16 , wherein the aluminum alloy component comprises a 7075 alloy.

18. The method of claim 16 , further comprising artificially aging the aluminum alloy component.

19. The method of claim 16 , wherein:
the aluminum alloy component is an ingot;
the forming device is a rolling mill; and
the desired shape is a plate or a sheet.

20. The method of claim 16 , wherein the forming device is a forming press.

21. The method of claim 16 , further comprising maintaining the aluminum alloy component at the solutionizing temperature for a predetermined time, wherein the predetermined time is up to approximately 30 minutes.

22. The method of claim 16 , wherein the quenching comprises die quenching with water flowing internally through a die such that the aluminum alloy component is cooled at a rate between approximately 50° C./second and approximately 500° C./second.

Assignees

• Novelis Inc

Inventors

• Mohanty Rashmi Ranjan
• Bendzinski Duane E
• Kulkarni Rahul Vilas

Classifications

• C22C21/10 Primary

  with zinc as the next major constituent · CPC title

• C22F1/053 Primary

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

• B21B45/004

  Heating the product · CPC title

• B21B2003/001

  Aluminium or its alloys · CPC title

• B21D22/022

  by heating the blank or stamping associated with heat treatment (C21D takes precedence) · CPC title