Method of assembling two parts, at least one of which is made of a composite, and insert for carrying out the assembly
View Patent ↗A method for bonding a first part made of a composite to a second part to a predetermined dimension is disclosed. The method includes placing an insert into the first part, a first surface of the insert protruding beyond the predetermined dimension; machining the insert until the first surface is at the predetermined dimension; placing the second part on the insert; and fastening the second part via the insert. The use of an insert makes it possible to produce, with high precision, a reproducible assembly, which can still be dismantled.
1. A method for bonding a first part made of a ceramic matrix composite to a second part to create an assembly, the method comprising:
drilling a hole in said first part;
placing an insert into said first part along an axis of the hole, a first surface of said insert protruding beyond a predetermined dimension between the first surface of the insert and a first surface of the first part in a direction parallel to the axis of the hole;
machining the first surface of the insert until a distance between the first surface of the insert and the first surface of the first part in the direction parallel to the axis of the hole is the predetermined dimension;
placing the second part on the first surface of the insert; and
fastening the second part via the insert.
2. The method as claimed in claim 1 , wherein the insert includes a cylindrical portion and a portion with a shoulder, the cylindrical portion of the insert is placed in the hole such that the shoulder abuts a second surface of the first part, the second surface of the first part is opposite the first surface of the first part, and the insert is fastened by a washer that is brazed to the first surface of the first part.
3. The method as claimed in claim 2 , wherein the brazing temperature is above the operating temperature of the assembly so that the insert pinches on the first part.
4. The method as claimed in claim 2 , wherein at least one of the portion of the insert with the shoulder or the cylindrical portion of the insert is machined.
5. The method as claimed in claim 2 , wherein the second part is fastened to the first part by a rivet, a welded stud or a bolt passing through the insert along an axis of the cylindrical portion.
6. The method as claimed in claim 2 , wherein the insert comprises a first part of defined thickness is bonded to a second part to a defined dimension, wherein the cylindrical portion is of greater height than the thickness of the first part, the shoulder having a protrusion that can be machined off.
7. The method as claimed claim 6 , wherein the insert further comprises a central bore passing through the cylindrical portion and the shoulder.
8. The method as claimed in claim 1 , further comprising assembling a third part via the insert.
9. The method as claimed in claim 2 , wherein the shoulder includes a clamping means for immobilizing the insert during the machining operation.
10. The method as claimed in claim 2 , further comprising machining two flaps that are parallel to each other on the shoulder of the insert.
11. The method as claimed in claim 2 , further comprising machining two notches in the shoulder of the insert.