INDUSTRY COMPONENT

Cooling Bore

Precision cooling channel in rolling mill work rolls for temperature control during metal forming.

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Component Specifications

Definition
A cooling bore is a precisely engineered internal channel or passage within a heavy-duty rolling mill work roll designed to circulate coolant fluids. Its primary function is to manage and dissipate the intense thermal energy generated during the hot or cold rolling process of metals, thereby maintaining optimal roll surface temperature, preventing thermal fatigue, ensuring dimensional stability of the rolled product, and extending the operational lifespan of the work roll.
Working Principle
Operates on forced convection heat transfer. A coolant (typically water or oil-based fluid) is pumped under pressure through the internal network of bores. As the coolant flows, it absorbs heat from the roll body, which is heated by contact with the hot metal slab. The heated coolant is then expelled, and cool fluid is continuously supplied, creating a closed-loop system that maintains a stable thermal gradient across the roll.
Materials
The bore is machined directly into the roll body material. Common roll materials include forged alloy steels (e.g., 86CrMoV7, 70Cr3NiMo), high-chromium iron (Hi-Cr), or indefinite chill double-pour (ICDP) iron, selected for high strength, wear resistance, and thermal conductivity.
Technical Parameters
  • Bore Diameter 10-50 mm
  • Coolant Flow Rate 50-500 L/min per roll
  • Operating Pressure 3-15 bar
  • Coolant Temperature 20-40 °C (inlet)
  • Surface Temperature Control ±5 °C variance
Standards
ISO 1352, DIN 1543

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Cooling Bore.

cooling bore work roll cooling rolling mill component thermal management metal rolling industrial cooling system roll temperature control Cooling Bore in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Heavy-Duty Rolling Mill Work Roll

Core rotating cylinder that directly contacts and shapes hot steel during rolling

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Engineering Analysis

Risks & Mitigation
  • Thermal stress cracking
  • Coolant leakage into roll bearings
  • Corrosion and scaling inside bores
  • Insufficient cooling leading to roll thermal crown
FMEA Triads
Trigger: Coolant contamination with particulate matter or scale formation.
Failure: Partial or complete blockage of bore, reducing flow and heat transfer efficiency.
Mitigation: Implement multi-stage filtration of coolant, regular chemical treatment to prevent scaling, and scheduled bore cleaning cycles.
Trigger: Cyclic thermal loading and mechanical stress.
Failure: Development of fatigue cracks originating from the bore surface, potentially leading to catastrophic roll fracture.
Mitigation: Use finite element analysis (FEA) for optimal bore placement and geometry, specify materials with high thermal fatigue resistance, and apply non-destructive testing (NDT) during roll refurbishment.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Bore diameter tolerance: H7, positional tolerance per bore pattern: ±0.5 mm, surface finish (Ra) inside bore: ≤ 3.2 µm.
Test Method
Hydrostatic pressure test at 1.5x operating pressure for 30 minutes, flow rate verification against design specification, thermographic imaging to check for uniform cooling distribution.

Buyer Feedback

★★★★☆ 4.5 / 5.0 (14 reviews)

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"The technical documentation for this Cooling Bore is very thorough, especially regarding technical reliability."

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Frequently Asked Questions

What happens if a cooling bore becomes clogged?

Clogging leads to localized overheating, causing thermal cracks (fire cracking) on the roll surface, increased roll wear, poor strip shape control, and potential roll failure requiring premature replacement.

How are cooling bores cleaned and maintained?

Regular maintenance involves high-pressure water jetting, chemical descaling agents, and sometimes mechanical brushing. Ultrasonic testing may be used to inspect for internal cracks or blockages.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Coolant Nozzle Cooling Channel