Cooling Bore: Bore Diameter 10-50 mm

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

Parameter	Typical range	Notes & selection driver
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

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 1352, DIN 1543

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

Typical Suppliers & Equivalents

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.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Cooling Bore

Manufacturer profiles associated with Cooling Bore.

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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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Cooling Bore