CBN Inserts for Cast Iron Machining
Select CBN and PCBN inserts for grey cast iron, hard cast iron, fine boring, valve-seat machining and abrasive cast-iron components. Match the grade, geometry and cutting condition to the required finish, edge reliability and tool life.
Choose CBN Inserts by Cast Iron Type
Graphite structure, hardness, inclusions and interrupted surfaces can change the required PCBN grade and edge condition.
Grey Cast Iron Turning
For continuous or interrupted machining of abrasive grey-iron components, bores and functional surfaces.
Hard Cast Iron Machining
Use high-wear-resistance grade direction where hard phases and abrasive structure dominate tool wear.
Chilled and White Iron
Review hardness variation, hard surface zones and impact before selecting the grade and insert geometry.
Pearlitic Cast Iron Components
Match the insert to hardness, surface scale, machining allowance and required production stability.
CBN Inserts for Cast Iron Applications
Choose the insert geometry and edge style around the machining movement, rigidity and required surface.
External Turning and Facing
Stable C, S and W-type geometries can support external diameters, faces and repeatable cast-iron production.
Fine Boring
Positive-clearance geometries can help control cutting force where bore accuracy, finish and boring-bar stability are important.
Valve-Seat Machining
Review seat material, hardness, interrupted contact and profile requirement when selecting the grade and cutting edge.
Interrupted Cast-Iron Surfaces
Use a tougher grade direction and stable insert body where holes, slots, scale or interrupted engagement increase impact.
鋳鉄の切削用PCBNグレード
High-CBN grades are commonly selected for abrasive cast iron, but the final choice must also account for interruption and edge strength.
| グレード | CBN含有量の目安 | Condition Direction | Cast Iron Application |
|---|---|---|---|
| OBW85 | Approx. 85% | Abrasive materials and heavier interruption | ねずみ鋳鉄の精密ボーリング、バルブシート、および硬質で研磨性の強い被削材 |
| OMB90 | Approx. 90% | 高い耐摩耗性 | Grey cast iron, hard cast iron and selected high-wear applications |
| OBX60 / OBX65 | 約 65% | Tougher interrupted-cut direction | Use where impact resistance is more important than maximum CBN content |
| Other Grades | Varies | Application-dependent | Confirm availability by insert code, structure and specific cast-iron condition |
Confirm the final OBX60/OBX65 commercial name and grade availability for each insert code before publishing.
CBN Cutting Parameters for Cast Iron
Use these values as starting ranges. Final speed, feed and depth of cut must be adjusted to the selected PCBN grade, insert geometry, cast-iron hardness, surface scale, interruption and machine rigidity.
| 素材 | 操作 | 切削速度 Vc | デプス・オブ・カットap | Feed f / fz |
|---|---|---|---|---|
| 冷却鋳鉄 | Turning / roughing | 60–140 m/min | 1.0–2.5 mm | 0.2–0.6 mm/rev |
| 冷却鋳鉄 | Final turning | 70～160 m/min | 0.1～1.0 mm | 0.1～0.35 mm/回転 |
| 冷却鋳鉄 | ミーリング | 100–200 m/min | 0.1–2.5 mm | 0.1–0.25 mm/tooth |
| Grey Cast Iron GGG 20–30 | Turning / roughing | 500–1500 m/min | 1.5–4.0 mm | 0.2–0.6 mm/rev |
| Grey Cast Iron GGG 20–30 | Final turning | 800～2000 m/min | 0.5–1.5 mm | 0.1～0.35 mm/回転 |
| Grey Cast Iron GGG 20–30 | ミーリング | 800～2000 m/min | 0.5–4.0 mm | 0.1–0.35 mm/tooth |
| Grey Cast Iron GGG 40–70 | Turning / roughing | 500–1200 m/min | 1.2–3.5 mm | 0.2–0.5 mm/rev |
| Grey Cast Iron GGG 40–70 | Final turning | 800～2000 m/min | 0.3–1.3 mm | 0.2–0.3 mm/rev |
| Grey Cast Iron GGG 40–70 | ミーリング | 800～2000 m/min | 0.5–3.5 mm | 0.1–0.3 mm/tooth |
Start from the lower half of the range for a new setup, unstable clamping, surface scale or interrupted engagement. Increase one parameter at a time after checking edge condition, dimensional stability and surface finish.
Choose the Insert Geometry for Cast Iron
Select the shape according to operation, machine rigidity, bore access and interruption level.
| Machining Direction | Representative Families | 典型的な使用例 |
|---|---|---|
| Stable external turning | CNGA, SNGA, WNGA | Diameters, faces and general cast-iron turning |
| Profiling and access | DNGA, VNGA | Contours, shoulders and restricted profiles |
| Fine boring / lower force | CCGW, DCGW, TCGW, VCGW | Internal machining and lower-rigidity setups |
| Long or entire edge | Selected E / L structures | Applications requiring wider PCBN edge engagement |
Common Cast Iron Machining Problems
Identify the dominant failure mode before changing grade, geometry or cutting conditions.
Rapid Abrasive Wear
Review material hardness, inclusions, surface scale, cutting speed and grade wear resistance.
エッジの欠け
Check interruption, casting voids, setup rigidity, edge preparation and grade toughness.
表面仕上げ不良
Review nose radius, feed, vibration, accumulated wear and consistency of the cast structure.
Thermal Cracking
Review coolant consistency, interrupted engagement and repeated thermal cycling around the edge.
Information Needed for a Cast Iron Insert Recommendation
Accurate selection requires the actual casting condition, operation and current process result.
CBN Inserts for Cast Iron: Common Questions
Are CBNインサート suitable for cast iron?
Yes. PCBN inserts are widely used for grey cast iron, pearlitic cast iron, hard iron and selected chilled or abrasive cast-iron applications.
Which PCBN grade is suitable for grey cast iron?
High-CBN grades are commonly used for abrasive grey-iron machining. The final choice depends on interruption, hardness, surface scale, operation and insert-code availability.
Can CBN inserts machine hard cast iron?
Yes, but hardness variation, hard phases and impact must be reviewed carefully. A wear-resistant grade and stable geometry are typically important.
Which insert shape is suitable for cast iron turning?
C, S and W shapes provide stable cutting bodies, while D and V shapes improve profile access. Positive inserts may be useful for fine boring and lower-force setups.
Can PCBN inserts be used for valve-seat machining?
Yes. The correct grade and edge depend on valve-seat material, hardness, profile, interrupted contact and required finish.
Why does a CBN insert chip when machining cast iron?
Possible causes include casting voids, severe interruption, unstable clamping, excessive edge load, unsuitable edge preparation or insufficient grade toughness.
What information is needed for a cast iron insert quotation?
Provide the cast iron type, hardness, operation, insert code, cutting data, current tool life, failure mode and required quantity.
Send Your Cast Iron Machining Application
Share the material, operation, insert code and current process. Our team will review the PCBN grade, geometry and quotation.
- Cast iron type and hardness
- Turning, boring, valve-seat or interrupted operation
- Insert and holder code
- Cutting speed, feed and depth of cut
- Current tool life and failure mode
- Required quantity and target surface finish
