Nozzle casings for Ariane 5 and 6 rockets
Key figures
nozzle casings manufactured for Ariane 5
18-year partnership between ArianeGroup & CNIM
manufacturing tolerance
Since 2004, CNIM Systèmes Induistriels has contributed to the reliability* of the Ariane 5 rocket by manufacturing all of the metal structures for the Ariane 5 nozzles. To date, CNIM Systèmes Industriels has produced more than 200 nozzle casings for the space player.
* "Ariane 5, the most reliable launcher on the market, holding the record for the number of successful consecutive launches” (Source ArianeGroup)
Ariane rockets and CNIM Systèmes Industriels nozzle structure CNIM ©ArianeGroup
The Ariane 5 boosters are made up of a main body and its nozzle. Located at the base of the thrusters, the 2 nozzles evacuate and guide the propulsion gases during the rocket's first flight phase.
Nozzle structures are made up of 3 parts, called "casings", assembled together. Subsequently, other parts are added inside the casings to form the complete nozzle.
High precision, large size and flawless parts.
Production challenges lie in the manufacturing delay, large-scale machining precision and in the final sealing of the nozzle.
In 9 months, CNIM Systèmes Industriels carries out all the manufacturing stages of the Ariane 5 nozzle casing, from the raw material order to delivery to the customer. On average, 7 Ariane 5 rockets are produced per year to put satellites into orbit; i.e. 14 sets of casings per year to be manufactured by CNIM Systèmes Industriels.
The machining of casings for space applications is of a very high precision with a manufacturing tolerance of 0.01 mm on parts up to 2.8 m in diameter, 1.25 m high and weighing 770 kg *
*characteristics of the downstream casing. The nozzle and upstream casings have the following characteristics respectively: 1.74 m and 2.2 m in diameter; 0.5m and 1.4m high; 300kg and 295kg
Very high precision 3D controls
CNIM Systèmes Industriels has large-scale metrology machines to meet ArianeGroup's quality requirements. The operating modes of the manufacturing processes have been specially designed to meet the very high precision required on the parts.
All the casings are checked in 3D in an air-conditioned metrology room.
Contrôle par ressuage
Electron beam welding and large dimension machining
Until 2008, CNIM Systèmes Industriels used electron beam welding to assemble the downstream casing (see photo below). Then CSI supplied untreated moulded parts and machined them before checking them and delivering them to ArianeGroup.
Soudure par faisceau d'électrons entre les parties du carter aval.
Tournage de grande dimension
Ariane 6 : le partenariat continue entre CSI et l’acteur du spatial
En août 2018, ArianeGroup a renouvelé sa confiance en CNIM Systèmes Industriels en lui confiant la fabrication des carters de tuyères pour le lanceur Ariane 6.
Usinage grande dimension pour ArianeGroup