Method for assembling a piece of metal material to a piece...

F - Mech Eng,Light,Heat,Weapons – 16 – B

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F16B 5/04 (2006.01)

Patent

CA 2719149

The invention relates to a method for assembling a piece of metal material (1) to a piece of composite material (2), with the assembling of the said pieces taking place by means of an attachment member (11), characterized in that the method comprises the following steps in which: - the two pieces are pre-drilled so as to form a gap (6) of diameter D1 in the metal piece (1) and in the piece of composite material (2), - an insert is applied (9) that is of variable diameter in the direction of the thickness of the pieces in said gap (6), said insert comprising a main hollow body (12) and at least one loop (10) intending to at least partially support against the outside surface (101) of the piece, said insert (9) intending to accommodate the attachment device (11), - residual compressive stresses are generated by radial expansion on the inner wall of the insert, by means of an expansion tool (7) that has an outside diameter engaging with the inserts inner diameter; these residual compressive stresses are generated in at least one area of the two pieces along the circumference of the insert (9), - the gap in the main body (12) of the insert is created such that the insert has a final inside diameter Dfinal that is substantially larger than the outer diameter of the attachment member (11) so as to allow some play between the inserts inside wall and the outside surface of the attachment member, and the attachment member (11) is positioned inside the insert to keep the metal and composite pieces together.

L'invention concerne un procédé d'assemblage entre une pièce en matériau métallique (1) et une pièce en matériau composite (2), l'assemblage entre lesdites pièces étant réalisée au moyen d'un organe de fixation (11), caractérisé en ce que le procédé comporte les étapes suivantes dans lesquelles : - on réalise un pré-perçage dans les deux pièces de manière à former un évidement (6) de diamètre D1 dans la pièce en matériau métallique (1) et dans la pièce en matériau composite (2), - on met en place un insert (9) ayant un diamètre variable dans la direction de l'épaisseur des pièces dans ledit évidement (6), ledit insert comportant un corps principal creux (12) et au moins une bride (10) destinée à venir au moins partiellement en appui contre la face externe (101) d'une pièce, ledit insert (9) étant destiné à recevoir l'organe de fixation (11), - on génère par expansion radiale sur la paroi interne de l'insert au moyen d'un outil d'expansion (7) ayant un diamètre extérieur coopérant avec le diamètre intérieur de l'insert, des contraintes résiduelles de compression dans au moins une zone des deux pièces le long de la circonférence de l'insert (9), - on réalèse l'évidement du corps principal (12) de l'insert de sorte que l'insert a un diamètre intérieur final D final sensiblement supérieur au diamètre extérieur de l'organe de la fixation (11) de manière à laisser un jeu entre la paroi interne de l'insert et la surface extérieure de l'organe de fixation, et - on positionne l'organe de fixation (11) dans l'insert pour maintenir la pièce métallique et la pièce composite ensemble.

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