Nachi
Nachi GP/SP Hob Hyper DuAl Gear Cutters
Manufacturer: Nachi-fujikoshi corp
Model: GP/SP Hob
Features
Selection of hob to suit the application
| Type | Wet Hobbing (Oil, Emulsion) | Dry Hobbing | |||
|---|---|---|---|---|---|
| Standard Efficiency | High Efficiency | Super High Efficiency | High Efficiency | Super High Efficiency | |
| Re-grinding + Re-coating (Full coating) | Hyper DuAl GP | Hyper DuAl GP | Hyper DuAl SP | ||
| Without re-coating (No coating on cutting face) | DuAl VX | DuAl EX | |||
Hob coating performance
| Property | DuAl VX | DuAl EX | Hyper DuAl GP | Hyper Dual SP |
|---|---|---|---|---|
| Wear resistance | ◯ | ◎ | ◎ | ◎ |
| Toughness | ◯ | ◯ | ◎ | ◯ |
| Heat resistance | △ | ◯ | ◎ | ◎ |
| Stability | ◎ | ◎ | ◎ | ◎ |
| Coolant | Wet & Dry | Wet & Dry | Efficient Wet & Dry | Super-efficient Dry |
| Hardness of coating | 2300 ~ 2500 | 2300 ~ 2500 | 2400 ~ 2600 | 2500 ~ 2700 |
| Heat resistance temp. | 850°C | 950°C | 1100°C | 1150°C |
Ideal selection of coating to suit the wear condition.
Performance comparison of Hyper DuAl GP/SP
Hyper DuAl GP: Extended tool life under conventional hobbing conditions.
Hyper DuAl SP: Outstanding performance under harsh conditions.
In some cutting areas, the performance of Hyper DuAl SP may be compromised under wet or conventional hobbing conditions.
Performance
Ultra-high speed hobbing with Hyper DuAl SP Hob
Work Spec.: m2.9 × PA16° × NT50, SCM420
Hob Spec.: φ95 × NT12 × 3TH
Material: FMH
Conditions: V = 250, 300 m/min, f = 3.0 mm/rev, Climb, dry hobbing (Chip thickness: 0.4 mm)
Excellent stability in ultra-high-speed hobbing (250 m/min or more) Advantage with work materials prone to cratering and wear
Hobbing of difficult-to-machine materials with Hyper DuAl SP Hob
Work Spec.: m1.78 × PA14.5° × NT80 × HA21° RH S45C 250HB
Face Width: 27 mm
Hob Spec.: φ70 × NT12 × 3TH
Material: FMH
Conditions: V = 110, 148 m/min, f = 3.0, 2.8 mm/rev, Climb, dry hobbing
No. of Cuts: 700
Superior wear resistance and stability with difficult-to-machine materials
Advantage with work materials prone to cratering and wear
Dry hobbing with Hyper DuAl GP Hob
Work spec.: m1.75 × PA17.5° × NT43 × HA34° LH SCr420H
Hob spec.: φ85 × NT16 × 4TH
Material: FMH
Conditions: V = 150 m/min, f = 2.0 mm/rev, Climb, dry hobbing
No. of cuts: 1,900
Extends tool life 1.5 times with superior coating
Suppresses VB wear of the root of the gear tooth by increasing adhesion
