D938 Twist drill for steel
Suitable for efficient Drilling of Steel, Cast Iron and Stainless steel
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- Feature
- Application
- Application case
- For efficient drilling of common steel, cast iron and stainless steel.
- New base material, perfect balance of toughness and wear resistance.
- New AlTiN-nano coating for excellent wear resistance.
- Optimized flute and drill tip design for superior self-centering and chipbreaking performance and good chip evacuation.
Specification
| Num of serirs | Specification | Cooling method | Cutting depth |
| D938-A3N | 1～20mm | external cold | 3D |
| D938-A3C | 2～20mm | internal cold | 3D |
| D938-A5N | 1～20mm | external cold | 5D |
| D938-A5C | 2～20mm | internal cold | 5D |
| D938-A8C | 3～20mm | internal cold | 8D |
| D938-A12C | 3~16mm | internal cold | 12D |
| D938-A15C | 3~14mm | internal cold | 15D |
| D938-A20C | 3~12mm | internal cold | 20D |
| D938-A25C | 3~8mm | internal cold | 25D |
Application
D938 machining case（Press Turbine Disks）
| Specification | D938-A3N-0970 |
| Dimension | D9.7*47*89*d10 |
| Material | 14Cr12Ni2WMoVNb (HB250) |
| Cutting speed | Vc=18m/min |
| Feed rate | fr =0.05mm/r |
| Cutting depth | ap=20mm |
| Cooling method | External cooling |
| Cutting method | vertical machining 、 Peck drilling |
D938 machining case（valve shell）
| Specification | D938-A15C-0850 |
| Dimension | D8.5*160*204*d10 |
| Material | 35CrMoA
(205-250HB) |
| Cutting speed | Vc=42.7m/min |
| Feed rate | fr =0.13mm/r |
| Cutting depth | ap=138mm |
| Cooling method | internal cooling |
| Cutting method | vertical machining 、 deep hole drilling |
