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Product Description
The tilting pad is a key design feature in high-performance white metal (Babbitt) bearings, specifically engineered to overcome oil whirl instability common in rotating machinery. Unlike a fixed liner, each pad is an independent segment that is pivot-supported, allowing it to freely tilt and swivel in response to dynamic operating conditions.
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| Tilting Pad | Tilting Pad |
This self-adaptive capability is its core advantage. As shaft speed and load change, each pad automatically adjusts its angle to form an optimal converging oil wedge. This ensures the formation of a stable, high-pressure hydrodynamic oil film for effective lubrication. The tilting action inherently dampens vibrations and suppresses destabilizing forces, promoting exceptional rotor stability at high speeds.
Therefore, tilting pad white metal bearings are the preferred choice for critical, high-velocity applications such as steam and gas turbines, compressors, and high-power gearboxes, where reliability and precise shaft positioning are paramount.
The machining process for tilting pads in white metal bearings is a precision operation. It begins with forging or casting a steel pad backing, followed by precise machining to achieve the required outer geometry, pivot location, and pad thickness.
The key step is applying the white metal (typically a tin- or lead-based Babbitt alloy) to the pad's inner surface. This is done through a controlled casting process where the pre-heated steel backing is placed in a mold, and the molten white metal is poured to form a perfectly bonded lining. After casting, the pad undergoes critical finishing. The white metal surface is precisely machined, often by boring or facing, to achieve the exact inner radius, surface finish, and oil groove patterns specified for optimal hydrodynamic film formation. Finally, each pad is individually balanced and may undergo hand-scraping for the finest performance alignment within the bearing assembly.
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| Tilting pad | Tilting pad |
Product inspection for tilting pads in white metal bearings is a rigorous, multi-stage process ensuring each component meets critical performance standards.
Dimensional & Geometric Inspection: Utilizing coordinate measuring machines (CMM) and precision gauges, inspectors verify the pad's exact thickness, inner radius (curvature), pivot point location, and overall geometry. This guarantees perfect fit and correct oil film geometry within the bearing housing.
White Metal Layer Inspection: The integrity of the bonded Babbitt lining is paramount. Ultrasonic testing checks for subsurface voids or lack of fusion between the metal and steel backing. The lining's thickness is measured to ensure it conforms to the specified range for optimal load-bearing capacity and heat dissipation.
Surface & Visual Inspection: The running surface undergoes meticulous scrutiny. Surface roughness is measured with profilometers to achieve the required finish for efficient hydrodynamic lubrication. A final visual inspection confirms the absence of cracks, porosity, or inclusions in the white metal, and ensures oil grooves are clean and precisely formed. Each pad is also balanced to prevent vibration.
The packaging and shipping of tilting pads for white metal bearings require meticulous care to protect their precision-machined surfaces and prevent corrosion.
Packaging Process: Each tilting pad is first cleaned and coated with a high-quality, temporary anti-corrosive oil or grease. It is then individually wrapped in VCI (Vapor Corrosion Inhibitor) paper or sealed in a plastic barrier bag, which provides corrosion protection without direct contact. Pads are securely nestled within custom-cut foam or thermoformed plastic inserts inside a sturdy, crush-resistant cardboard or wooden box. This immobilizes the parts, preventing movement, abrasion, and impact damage during transit. The outer container is clearly labeled with handling symbols (fragile, keep dry, this side up) and part identification details.
Shipping: For domestic or standard international shipments, robust parcel courier services are typically used. For high-value or bulk orders, sea freight in containers is the standard method, ensuring the packaged boxes are properly palletized and secured to prevent shifting.
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