INDUSTRY COMPONENT

Turbine Wheel Bore

Precision-machined central bore in turbine wheels for shaft mounting and rotational balance in turbine systems.

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Component Specifications

Definition
The turbine wheel bore is a critical cylindrical opening machined at the geometric center of turbine wheels, designed to interface with drive shafts through interference fits or keyed connections. This component ensures precise concentric alignment, transmits rotational torque from the shaft to the turbine blades, and maintains dynamic balance during high-speed operation. Its dimensional accuracy directly impacts turbine efficiency, vibration levels, and operational lifespan.
Working Principle
The bore functions as the mechanical interface between the rotating turbine wheel and the drive shaft. During operation, torque is transferred from the shaft to the wheel through this connection. The bore's precise diameter and surface finish ensure minimal radial play, maintaining concentricity to prevent imbalance-induced vibrations at high rotational speeds (typically 10,000-100,000 RPM). Proper interference fit or keyway engagement prevents relative motion that could cause fretting wear or catastrophic failure.
Materials
Typically manufactured from high-temperature alloys: Inconel 718 (AMS 5662), Waspaloy (AMS 5708), or titanium alloys (Ti-6Al-4V, AMS 4928) for gas turbines; 4140 steel (ASTM A29) or 17-4PH stainless steel (AMS 5643) for steam turbines. Surface treatments include nitriding (AMS 2759/10) or ceramic coatings for wear resistance.
Technical Parameters
ParameterTypical rangeNotes & selection driver
HardnessHRC 32-45 (core), HRC 60+ (surface treated)
Roundness< 0.005 mm
Concentricity< 0.01 mm TIR
Surface FinishRa 0.4-0.8 μm
Temperature Range-50°C to 650°C (material dependent)
Diameter ToleranceH7/h6 IT grade

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 1101, ISO 286-2, DIN 7190, ASME Y14.5

Engineering Analysis

Risks & Mitigation
  • Thermal expansion mismatch
  • Fretting corrosion at shaft interface
  • Stress concentration at bore edges
  • Balance disruption from bore defects
FMEA Triads
Trigger: Insufficient interference fit or loose tolerances
Failure: Relative motion between shaft and bore causing fretting wear, imbalance, and eventual connection failure
Mitigation: Implement statistical process control for bore machining, use selective assembly with shaft matching, apply anti-fretting coatings
Trigger: Thermal cycling beyond material limits
Failure: Bore diameter changes causing loss of interference fit or excessive stress leading to cracking
Mitigation: Select materials with matched thermal expansion coefficients, incorporate thermal barrier coatings, design with thermal growth accommodation
Trigger: Surface finish imperfections or machining marks
Failure: Stress concentration initiating fatigue cracks, particularly in high-cycle fatigue environments
Mitigation: Specify Ra < 0.8 μm surface finish, implement non-destructive testing (MPI or FPI), use roller burnishing for compressive stress induction

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Geometric tolerances per ISO 1101:2017, dimensional tolerances per ISO 286-2:2020, interference fits calculated per DIN 7190:2017
Test Method
CMM verification (ISO 10360-2), surface roughness testing (ISO 4287), ultrasonic thickness measurement (ASTM E797), dye penetrant inspection (ASTM E1417)

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
Check the legal entity, factory address, ownership, certifications, and direct contacts.

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Manufacturers of Turbine Wheel Bore

Manufacturer profiles associated with Turbine Wheel Bore.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the primary function of the turbine wheel bore?

The bore provides the precise mounting interface between the turbine wheel and drive shaft, ensuring torque transmission and maintaining rotational balance during high-speed operation.

Why are specific material alloys used for turbine wheel bores?

High-temperature alloys like Inconel or titanium provide necessary strength, creep resistance, and thermal stability at extreme operating temperatures while maintaining dimensional stability.

How does bore concentricity affect turbine performance?

Poor concentricity creates mass imbalance, leading to destructive vibrations, reduced efficiency, bearing wear, and potential catastrophic failure at high rotational speeds.

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.

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