BJGF Drill
Hole accuracy : IT8
Carbide drill for one-shot
machining of cast iron!
- Excellent machining with
“drill edges+ 4 special reamer edges”
- IT8-class hole one-shot finishing
- Excellent surface finish
- Long life with coatings for hard materials
“Amazing Ideas / Facts!”
The BJGF drill consists of “2 drill edges + 4 burnishing reamer edges”.
- High rigidity and high precision machining
- “Back jet coolant” for superior cooling & chip evacuation : excellent surface finish
- “Multi layered coating” extends tool life & one shot finishing of cast iron
IT8-class hole diameter accuracyGood !
Excellent surface roughnessGood !
POINT!
Dividing the role of the cutting edge by functionExcellent !
Background / Point for Development
Background
- Although “One-shot drill” has been developed to improve productivity in the machining of cast iron, the built-up on reamer edges caused bad surface finish.
Point for Development
- “Back-Jet-Coolant” has successfully improved the cooling efficiency on the cutting edges and the chip evacuation.
Reduced built-up edges that had caused bad surface finish.
Multi layered coating for hard materials has significantly reduced edge wear, hence longer tool life.
Example
| Tool | BJGF drill |
|---|---|
| Workpiece | Test piece |
| Material | FC250 |
| Tool Diameter | ø8mm |
| Cutting Conditions |
|
| Required accuracy |  |
|---|
Hole Diameter
Surface Roughness
Changes in roundness
Product Specification
Tool Specification
| Process covered | knock holes, high precision hole |
|---|---|
| Diameter | ø6 - 20 |
| Standard conditions |
|
| Performance | Precision: IT8 Roughness: ≤ Rz12.5 (≤ Ra3.2) Roundness: 10µm |
Example of applicable work
