Ring for a connection element, a connection element and corresponding manufacturing method

1. A ring for a connection element, the ring comprising:

a contact portion configured to cooperate with a contact surface of another ring and formed of a first metallic material; and

a fastening portion configured to be secured to a support and formed of a second metallic material, the hardness of the first material being substantially greater than that of the second material, and the toughness of the second material being substantially greater than that of the first material, the contact portion and the fastening portion being made in one piece;

wherein the fastening portion includes a cage having a radial fastening rim and a substantially axial portion with a plurality of circumferentially spaced windows, the axial portion including a first axial portion with a first diameter and a second axial portion with a second diameter, the first diameter being greater than the second diameter, and a foldover portion connecting the first and second axial portions.

2. The ring according to claim 1 , wherein the contact portion and the fastening portion are made in one piece by sintering of metallic powders.

3. The ring according to claim 1 wherein the radial fastening rim of the cage is attached to the contact portion.

4. The ring according to claim 1 , wherein:

the first material is one of T15, AMS6560, T1 (Z80 WCrV18.4.1), M 6, M50 and ASP2055; and

the second material is one of titanium alloy, aluminum alloy, steel 32 CVD13 and INCONEL718.

5. A method of manufacturing a ring for a connection element, the ring including a contact portion configured to cooperate with a contact surface of another ring and formed of a first metallic material and a fastening portion configured to be secured to a support and formed of a second metallic material, the hardness of the first material being substantially greater than that of the second material, and the toughness of the second material being substantially greater than that of the first material, the method comprising the steps of:

disposing a first metallic powder in an enclosure;

disposing a second metallic powder in the enclosure, the second powder being different from the first powder;

sintering of the powders disposed within the enclosure so as to produce, in one piece, the contact portion and the fastening portion of the ring; and

disposing a third metallic powder in the enclosure, the third powder being different from the first and second powders, the sintering of the first, second and third powders in the enclosure producing an additional portion of the ring in one piece with the contact portion and the fastening portion.

6. The method according to claim 5 , further comprising the step of placing a spacer means in the enclosure prior to disposing the first metallic powder such that the first and second powders disposed within the enclosure are arranged around the spacer means.

7. The method according to claim 5 , wherein the step of sintering the first and second powders includes at least one of spark plasma sintering and hot isostatic pressing.

8. The method according to claim 5 , further comprising at least one of the steps of:

heat treating a preform after sintering of the first and second powders; and

machining a preform after sintering of the first and second powders.

9. A method of manufacturing a ring for a connection element, the ring including a contact portion configured to cooperate with a contact surface of another ring and formed of a first metallic material and a fastening portion configured to be secured to a support and formed of a second metallic material, the hardness of the first material being substantially greater than that of the second material, and the toughness of the second material being substantially greater than that of the first material, the method comprising the steps of:

disposing a first metallic powder in an enclosure;

disposing a second metallic powder in the enclosure, the second powder being different from the first powder;

sintering of the powders disposed within the enclosure so as to produce, in one piece, the contact portion and the fastening portion of the ring; and

placing a spacer means in the enclosure prior to disposing the first metallic powder such that the first and second powders disposed within the enclosure are arranged around the spacer means.