Set di ingranaggi temprati — rettificati dopo il trattamento termico
Un set di ingranaggi cilindrici e componenti di trasmissione, lavorati allo stato ricotto, cementati a 60 HRC e rettificati per ripristinare la geometria persa in tempra.
Specifica del particolare
- Settore
- Industrial Machinery
- Processo
- Precision Grinding
- Materiale
- Steel 4140 / case-hardened
- Tolleranza
- ±0.002 mm
- Finitura
- Ground, Ra 0.2 µm on flanks
- Quantità
- 400 / year
- Tempo di consegna
- 25 working days
Dati del cliente non divulgati per NDA.
Sfida
The previous process hardened the gears after finish machining and accepted whatever distortion resulted. Noise levels varied between batches and roughly 12 % of parts fell outside the tooth profile tolerance after hardening.
Soluzione
The routing was changed to machine in the annealed condition with a grinding allowance on the bore, faces and tooth flanks, then case-harden, then finish-grind. Bore and faces are ground on a cylindrical grinder; tooth flanks are profile-ground against the theoretical involute.
Risultato
Tooth profile now holds DIN quality 7 consistently. The out-of-tolerance rate after hardening fell from 12 % to zero, because the geometry is created after the distortion rather than before it. Measured noise at rated speed dropped by 4 dB(A).
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