Wind Turbine Main Shaft Bearing Housing

The Wind Turbine Main Shaft Bearing Housing is a foundational structural component in horizontal-axis wind turbines, responsible for supporting the rotor shaft and transmitting aerodynamic loads to the nacelle frame. Operating under continuous cyclic loading, extreme temperature variations, and 20+ year service life requirements, this component demands exceptional fatigue strength, dimensional stability, and metallurgical soundness.

Ningbo Ruican produces this housing through precision Sand Casting of QT700-2 ductile iron, followed by 5-axis CNC MACHINING of critical bearing seat surfaces, bolt hole patterns, and mounting interfaces. Our integrated manufacturing ensures full traceability from raw material to finished component.

Material Specifications

Parameter	Specification
Material	QT700-2 (EN-GJS-700-2) ductile iron
Tensile Strength	≥ 700 MPa
Yield Strength	≥ 420 MPa
Elongation	≥ 2%
Hardness	225–305 HBW
Nodularity	≥ 80% (Grade I–II per ISO 945)
Microstructure	Pearlite matrix with ≥ 80% nodular graphite

Casting Specifications

Parameter	Specification
Casting Process	Sand casting
Dimensional Tolerance	ISO 8062 CT5–CT7
Surface Roughness	Ra 6.3–12.5 μm (as-cast); Ra 1.6 μm (machined)
Weight Range	50–300 kg
Wall Thickness	15–60 mm
NDE (Non-Destructive Examination)	UT per EN 12680-2, Level 2

CNC Machining Parameters

Parameter	Specification
Machining Tolerance	±0.02 mm (bearing seat); ±0.1 mm (general)
Bearing Seat Roundness	≤ 0.02 mm
Cylindricity	≤ 0.03 mm
Surface Finish (bearing seat)	Ra 0.8 μm (ground)
Bolt Hole Position	True position ±0.05 mm
Machining Equipment	5-axis CNC vertical machining center