US 12,247,264 B2
Process for manufacturing a bimetallic part using a dilation-causing thermal treatment
Jean-Christophe Ehrstrom, Grenoble (FR); Julien Laye, La Sure en Chartreuse (FR); Sylvie Arsene, Apprieu (FR); and Timothy Warner, Corenc (FR)
Assigned to CONSTELLIUM ISSOIRE, Issoire (FR)
Appl. No. 16/973,111
Filed by CONSTELLIUM ISSOIRE, Issoire (FR)
PCT Filed Jun. 27, 2019, PCT No. PCT/FR2019/051597
§ 371(c)(1), (2) Date Dec. 8, 2020,
PCT Pub. No. WO2020/008129, PCT Pub. Date Jan. 9, 2020.
Claims priority of application No. 1856132 (FR), filed on Jul. 3, 2018.
Prior Publication US 2021/0238706 A1, Aug. 5, 2021
Int. Cl. C21D 9/50 (2006.01); B23K 20/233 (2006.01); G16C 60/00 (2019.01); B23K 101/00 (2006.01); B23K 103/10 (2006.01)
CPC C21D 9/505 (2013.01) [B23K 20/2336 (2013.01); G16C 60/00 (2019.02); B23K 2101/006 (2018.08); B23K 2103/10 (2018.08)] 16 Claims
OG exemplary drawing
 
1. A method for manufacturing a bimetallic part, comprising:
providing a first component formed by a first aluminium alloy and a second component formed by a second aluminium alloy, the first and second aluminium alloys being different from each other, the first component and the second component extending: along a longitudinal axis, over a length greater than five meters; and along a lateral axis perpendicular to the longitudinal axis, over a width greater than one tenth of the length;
carrying out the following steps:
a) determining a reference form corresponding to a form that is desired at the end of manufacture;
b) estimating the deformation of the assembled part induced by the heat treatment by digital modelling;
c) defining an initial form of the first component and an initial form of a second component, taking into account the reference form determined during step a) and the induced deformation estimated during step b), so that, at the end of the heat treatment, the part extends in the reference form; and
d) obtaining the first component and the second component according to the respective initial forms thereof defined during step c);
assembling the first component against the second component along the longitudinal axis to obtain an assembled part;
applying a heat treatment to the assembled part, at a temperature of between 100° C. and 250° C., the heat treatment causing an induced deformation of the assembled part, under the effect of a change in metallurgical nature in at least one of the first aluminium alloy and the second aluminium alloy;
cooling to ambient temperature, after which, said induced deformation remains.