Patent ID: 11878363
Assignee: TOYO KOHAN CO., LTD.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A method for producing a roll-bonded laminate having a two-layer structure of a first metal layer and a second metal layer, by roll-bonding a first metal plate and a second metal plate,
wherein a surface hardness Hv of the first metal plate is lower than a surface hardness Hv of the second metal plate; and
the method comprises:
sputter etching each of bonding surfaces of the first metal plate and the second metal plate to partially remove an oxide film on each of the bonding surfaces;
roll-bonding so as to satisfy the following expression (1):

0<(ΔL1/ΔL2)/T≤38  (1)

wherein ΔL1 (mm) represents an elongation amount of the first metal layer with respect to the first metal plate; ΔL2 (mm) represents an elongation amount of the second metal layer with respect to the second metal plate; T (mm) represents the total thickness of the roll-bonded laminate; and an elongation ratio (ΔL1/ΔL2) is 1.1 to lower than 4.15; and

subjecting the roll-bonded laminate to a shape correction using a tension leveler to make an elongation ratio of about 1 to 2%.