Method of producing aluminum clad member

Patent metadata

Field	Value
Publication number	US-9718145-B2
Application number	US-201615148373-A
Country	US
Kind code	B2
Filing date	May 6, 2016
Priority date	Mar 31, 2014
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

An aluminum clad member is produced by: disposing a joining assistance member at a joint interface between an Al core member and an Al skin member, which joining assistance member being formed by crossing Al wires with each other in longitudinal and lateral directions to form a grid, and having a structure in which spot-like thick portions having a thickness of 0.2-3.2 mm are formed at intersections of the Al wires and arranged in the longitudinal and lateral directions so as to be spaced apart from each other by a distance of 0.2-13 mm; and performing a hot rolling operation with respect to the thus obtained stack of the Al core member, the Al skin member and the joining assistance member, by partially fixing together those members at their peripheral portions or without fixing together those members, such that the joint interfaces is communicated with an ambient air.

First claim

The invention claimed is:

1. A method of producing an aluminum clad member by superposing at least one Al skin member formed of aluminum or an aluminum alloy on one or both of opposite major surfaces of an Al core member formed of aluminum or an aluminum alloy, to form a stack, and subjecting the stack to a hot rolling process, to join together said Al core member and said at least one Al skin member and integrate those members into a one-piece body, wherein:
said stack comprises a joining assistance member disposed at a joint interface between said Al core member and said at least one Al skin member, said joining assistance member being formed by crossing Al wires of aluminum or an aluminum alloy with each other in longitudinal and lateral directions to form a grid, and having a structure in which thick portions having a thickness of 0.2-3.2 mm are formed at intersections of said Al wires and arranged in the longitudinal and lateral directions so as to be spaced apart from each other by a distance of 0.2-13 mm;
said hot rolling process is performed with respect to said stack in a state wherein prior to said hot rolling process said Al core member, said joining assistance member and said at least one Al skin member are partially fixed together at a portion of a perimeter of said stack, or those members are not fixed together, and
said joint interface that is to be subjected to said hot rolling process is communicated with an ambient air.

2. The method of producing the aluminum clad member according to claim 1 , wherein said stack further comprises at least one Al sheet disposed on one or both of opposite sides of said joining assistance member, said at least one Al sheet having a thickness of 5-200 μm and being formed of an aluminum material having a Mg content of 0-0.7% by mass, and said hot rolling process is performed with respect to said stack in which said joining assistance member and said at least one Al sheet are disposed at said joint interface between said Al core member and said at least one Al skin member.

3. The method of producing the aluminum clad member according to claim 1 , wherein said Al wires have a diameter of 0.1-1.6 mm.

4. The method of producing the aluminum clad member according to claim 1 , wherein said Al wires are formed of an Al—Mg-based alloy containing 1.5-6% by mass of magnesium.

5. The method of producing the aluminum clad member according to claim 1 , wherein oxide films covering surfaces of said Al wires are chemically destructed and removed by a treatment performed with respect to said Al wires by using an acid solution or an alkaline solution.

6. The method of producing the aluminum clad member according to claim 1 , wherein said hot rolling process is performed by conducting a reverse rolling operation in which said stack is passed between a pair of rolls a plurality of times, and a direction of rotation of the rolls in odd-number passes and a direction of rotation of the rolls in even-number passes are opposite to each other, so that said hot rolling process is performed alternately in opposite two directions.

7. The method of producing the aluminum clad member according to claim 1 , wherein said stack is inserted between a pair of rolls without applying a load to said stack, and then a load is applied to said stack and the pair of rolls are rotated to perform said hot rolling process by conducting a reverse rolling operation in which a direction of rotation of the rolls is reversed each time said stack is passed between the rolls.

8. The method of producing the aluminum clad member according to claim 1 , wherein said stack further comprises an Al intermediate member in the form of a plate of aluminum or an aluminum alloy disposed between said Al core member and said at least one Al skin member,
said joining assistance member is disposed at at least one of an interface between said Al core member and said Al intermediate member and an interface between said Al intermediate member and said at least one Al skin member, and
prior to said hot rolling process said Al core member, said Al intermediate member, said joining assistance member and said at least one Al skin member are partially fixed together at a portion of the perimeter of said stack, or those members are not fixed together.

9. The method of producing the aluminum clad member according to claim 2 , wherein said stack further comprises an Al intermediate member in the form of a plate of aluminum or an aluminum alloy disposed between said Al core member and said at least one Al skin member, and
said joining assistance member and said at least one Al sheet having a thickness of 5-200 μm and formed of an aluminum material having a Mg content of 0-0.7% by mass are disposed at at least one of an interface between said Al core member and said Al intermediate member and an interface between said Al intermediate member and said at least one Al skin member, such that said at least one Al sheet is disposed on one or both of opposite sides of said joining assistance member.

10. The method of producing the aluminum clad member according to claim 2 , wherein said at least one Al sheet is formed of pure aluminum or an aluminum material having an aluminum content not lower than 99.0% by mass.

Assignees

• Uacj Corp

Inventors

• Itoh Yasunaga
• Ohashi Yusuke
• Sakoda Shoichi

Classifications

• B23K20/04 Primary

  by means of a rolling mill · CPC title

• B32B15/20

  comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)} · CPC title

• B21B2001/225

  by hot-rolling · CPC title

• C22F1/04

  of aluminium or alloys based thereon · CPC title

• B32B9/041

  of metal · CPC title