Carter de rotor aluminium à ailettes — 38 ailettes, parois de 0,9 mm
Un carter de rotor à 38 ailettes tournées et six nervures internes, usiné dans du 6061-T6 massif, avec des ailettes de 0,9 mm tenues à ±0,05 mm sur les 160 mm de diamètre.
Spécification de la pièce
- Secteur
- Industrial Machinery
- Procédé
- CNC Turning + Milling
- Matière
- Aluminium 6061-T6
- Tolérance
- ±0.05 mm
- Finition
- Bead blasted, clear anodised
- Quantité
- 250 / release
- Délai
- 14 working days
Identité du client non divulguée (NDA).
Problématique
The customer's previous supplier could not hold fin thickness consistently: fins near the outer diameter came out 0.15 mm thicker than those near the hub, and roughly one part in five showed chatter marks that failed the cosmetic specification. Thermal performance depends on fin pitch, so the variation was a functional problem, not just an appearance one.
Solution
We reversed the process order — turning the fin profile first while the billet was still rigid, then milling the internal rib pocket from the back with the part supported on a purpose-built vacuum fixture. Fins were cut with a ground form tool at constant surface speed and a light final pass, and the job was stress-relieved between roughing and finishing to stop the hub pulling as material came out.
Résultat
Fin thickness now holds ±0.05 mm from hub to rim, chatter has been eliminated, and the scrap rate dropped from 19 % to under 1 %. Cycle time fell 22 % against the original process despite adding the stress-relief step. The part has been in repeat production for eleven releases.
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