CBN Tools in the Metallurgical Roll Mill Industry
Modern metallurgical production relies heavily on roll mill performance, where machining quality directly impacts steel output efficiency and product quality.
The emergence of CBN (Cubic Boron Nitride) cutting tools provides a breakthrough solution for historically challenging high-hardness roll processing.
Challenges in Roll Machining
1. Material Hardness
Rolls made of high-speed steel (HSS) or high-chromium cast iron (70-85 HSD) cause accelerated tool wear.
2. Surface Precision Demands
Required surface roughness: ≤ Ra0.4μm for quality steel production.
3. Frequent Tool Changes
Traditional tools suffer rapid wear and edge chipping during high-hardness machining.
Advantages of CBN Cutting Tools
1. Ultra-High Hardness
(8,000-9,000 HV) – 3X harder than carbide, resisting abrasive wear.
2. Exceptional Heat Resistance
Stable cutting performance at >1,400°C.
3. High-Speed Machining
Operate at 150-350 m/min – 3-5X faster than conventional tools.
4. Superior Surface Finish
Achieves Ra0.2μm precision for high-grade rolls.
5. Extended Tool Life
Reduces changeovers and production costs.
CBN Tool Applications by Roll Type
1. Cast Iron Rolls (HSD 65-85)
- Challenge: High abrasion leading to chipping/grinding cracks
- Solution: Brazed PCBN tools with honed edges
- Parameters:
- Roughing: 120-180 m/min | Feed 0.1-0.3 mm/r | Cutting depth: 1-3 mm
- Finishing: Ra0.8μm achievable
2. Cast Steel Rolls (H13/High-Cr Steel)
- Challenge: Work hardening during cutting
- Solution: TiN-coated PCBN inserts for anti-adhesion
- Parameters:
- Speed: 150-250 m/min | Feed: 0.05-0.15 mm/r
3. Forged Steel Rolls
- Challenge: High toughness causing tool wear
- Solution: Negative-rake PCBN inserts (γ=-6°) for edge strength
- Parameters:
- Speed: 80-150 m/min | Cutting depth: 0.5 - 2 mm
Why Choose Our CBN Solutions?
Our brazed PCBN tools deliver:
▷Optimized geometries for roll profiles
▷Customized edge preps to prevent chipping
▷Proven 30-50% longer lifespan vs. competitors
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