Raccord sanitaire tri-clamp — 316L, électropoli à Ra 0,4 µm
Un raccord process sanitaire en 316L usiné complet sur centre de tournage-fraisage, électropoli intérieurement à Ra 0,4 µm et livré avec certificats matière et relevés d'état de surface.
Spécification de la pièce
- Secteur
- Medical Devices
- Procédé
- CNC Turning
- Matière
- Stainless 316L
- Tolérance
- ±0.02 mm
- Finition
- Electropolished Ra 0.4 µm
- Quantité
- 500 / year
- Délai
- 18 working days
Identité du client non divulguée (NDA).
Problématique
The part is used in a pharmaceutical fluid path, so the internal surface must be free of crevices, tool marks and embedded iron. The customer had been buying a welded fabrication that required boroscope inspection of every weld and still produced occasional rejects at validation.
Solution
We machined the fitting complete from solid 316L bar, eliminating the weld entirely. Internal surfaces were finish-bored with a polished carbide insert to Ra 0.8 µm, then electropolished to ASTM B912 to reach Ra 0.4 µm and restore the passive layer. Parts were cleaned in a multi-stage ultrasonic line with DI water rinse and double-bagged in a controlled area.
Résultat
Weld inspection was removed from the process entirely. Internal Ra measures consistently between 0.32 and 0.38 µm, comfortably inside the 0.4 µm specification, and validation now passes on the first article. Unit cost fell 17 % despite starting from solid bar, because the welding, boroscope and rework operations disappeared.
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