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CUMI Bonded Abrasives CatalogueProduct description
What sets Crankshaft grinding apart from the other cylindrical grinding process is the extremely crucial function of the crankshaft in itself. Crankshaft design requires meticulous attention from material selection to the various hardening processes.
Each part of the crankshaft is designed to have different hardness meeting specific demands of the application. Grinding of the shoulder region is a surface grinding operation, while the grinding of the pin is a cylindrical grinding operation. This poses a great challenge in designing a wheel that performs both these processes efficiently. With the incorporation of the latest advances in abrasive grains and Vitrified bond technology, CUMI provides Crankshaft grinding wheels that can face each of these challenges.
The basic composition of the wheels are designed to give maximum life and excellent form holding while physical forms like slotted wheels, sandwich wheels, sandwich wheels, dual grade wheels etc. enable the wheels to grind without burns.
Features:
- Sharp & friable aluminium oxide grains
- Low temperature fried fusible vitrified bond system
- Uniform density and hardness across wheel diameter
- Perfectly balanced
- Sandwich option for higher feed rates & improved form holding
Advantages of CUMI Wheels
- Lower BV ( Barkhausen value )
- Lower dressing depth
- No surface cracks
- Lower cost per component
- Good form retention ( for better radius profile)
| Abrasive Used | CUMI Code | Grit | Diameter (mm) | Diameter (inch) | Thickness (mm) | Thickness (inch) | Speed | Hardness | Structure |
|---|---|---|---|---|---|---|---|---|---|
| Pink Aluminium Oxide | 11RA/51RA | 46 - 100 | 600 - 1200 | 24 - 48 | 19 -125 | 3/4 - 5 | upto 60 | J -M | 5 - 8 |
| Pure Aluminium Oxide | 12A | ||||||||
| White Aluminium Oxide | AA | ||||||||
| Aluminium Oxide Blend | DA | ||||||||
| Brown Aluminium Oxide | A |
| Type | Operation | Speed | Best | Better | Good |
|---|---|---|---|---|---|
| Forged Steel | Soft | 35 | 12A54/60 J7 V2020 | AA463 K5 V2020 | A463 L5 V10X |
| 50 | 12A54/60 I7 V2020/50 | AA463 K5 V2020/50 | A463 K5 V45X | ||
| 60 | 11RA54/60 J7 V2020/60 | 12A467 I7 V2020/60 | AA463 K5 V2020/60 | ||
| Hard – PV | 35 | 12A601 K5 V2020 | SA601 K5 V2020 | A601 K5 V10X | |
| 50 | 12A601 K5 V2020/50 | AA601 K5 V2020/50 | DA601 K5 V2020/50 | ||
| 60 | 11RA54/60 J7 V2020/60 | 12A601 K5 V2020/60 | SA601 K5 V2020/60 | ||
| Hard - CV | 35 | 12A467 J7 V2020 | AA463 K5 V2020 | A463 L5 V10X | |
| 50 | 12A467 I7 V2020/45 | AA463 K5 V2020/50 | A463 K5 V45X | ||
| 60 | 11RA54/60 J7 V2020/60 | 12A467 I7 V2020/60 | AA463 K5 V2020/60 | ||
| For Soft shoulder & Hard Center Grinding | 60 | 2CUMISA542 J+6 V500/60 (slides) / AA602 J6 V500/60(Center) | 5SA543 K5 V500/60 | DA543 K5 V500/60 (slides) | |
| 5SA601 K5 V500/60 | DA601 K5 V500/60 (center) | ||||
| Cast Iron | upto 50 | AA46 K5 V2020/50 | SA46 K5 V2018/50 | DA46 K5 V50 | |
| Nodular Iron | upto 50 | 1CUMISA461 K6 V2020/50 | 5SA46 L5 V2020/50 | AA46 L5 V2020/50 |
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