Patent ID: 8458885

Claim:
Process for assembly of a part ( 1 ) made of metal material and a part ( 2 ) made of composite material, the assembly of said parts being implemented by means of an attachment element ( 11 ), characterized in that the process comprises the following stages in which: a pre-piercing is done in the two parts in such a way as to form a recess ( 6 ) with a diameter D 1 in the part ( 1 ) made of metal material and in the part ( 2 ) made of composite material, an insert ( 9 ) that has a variable diameter is installed in the direction of the thickness of the parts in said recess ( 6 ), whereby said insert comprises a main hollow body ( 12 ) and at least one flange ( 10 ) that is designed to rest at least partially against the outside surface ( 101 ) of a part, whereby said insert ( 9 ) is designed to accommodate the attachment element ( 11 ), residual compression constraints are generated by radial expansion on the inner wall of the insert by means of an expansion tool ( 7 ) that has an outside diameter that works with the inside diameter of the insert in at least one zone of the two parts along the circumference of the insert ( 9 ), the recess of the main body ( 12 ) of the insert is bored wider in such a way that the insert has a final inside diameter D final that is significantly greater than the outside diameter of the attachment element ( 11 ) so as to allow play between the inner wall of the insert and the outside surface of the attachment element, and the attachment element ( 11 ) is positioned in the insert to keep the metal part and the composite part together.