Uses of Babbitt Metal Bushings
Babbitt Metal Bushings alloys are noted for their hard/soft composition, which provides corrosion resistance, excellent wetting, low wear, and friction resistance. The copper and antimony create hard crystals throughout the structure, but the tin and lead are soft. The softer metal gear allows for better lubricant absorption as well as the absorption of any foreign particles.
A self-equalizing bearing can adjust to various angles and load variations. A sleeve bearing works on the basis that during rotation, the rod that fits the shaft rests on a very thin layer of lubrication. The bearing material would wear away if there wasn’t a small coating of lubricant between the rotating shaft and the sleeve. A thrust bearing can handle thrust along the supported shaft’s axis. To support axial thrust in either direction, tapered bearings are utilised in pairs. Radial loads can also be accommodated by a tapered bearing.
Tilting shoe bearings are Babbitt bearings that can be utilised to support axial thrust on a horizontal rotor assembly in turbomachinery. Tilting shoe thrust bearings that equalise tilt can be positioned vertically or horizontally. Their sizes range from 4 to 17 inches in diameter (in.). Equalising titling shoe thrust bearings come in two-shoe or six-shoe combinations and have standard or large bores. The diameter of non-equalizing tilting shoe thrust bearings ranges from 4 to 17 inches. The split in standard thrust bearings makes installation and replacement easier. Standard thrust bearings are frequently interchangeable with different thrust bearing types. Tilting shoe thrust bearings with a 60-inch outer diameter (OD) can be made to order.
Uses of Babbitt Metal Bushings:
Babbitt metal Bushings are used to line cast iron, steel, and bronze bearing shells. When a lubricant is unable to prevent the bearing’s moving parts from welding together, friction and wear occur. The Babbitt liner prevents this. As a result, the Babbitt extends the bearing’s life.
Babbitt ingot users melt the metal in iron kettles, then ladle or pump the molten alloy out. For tin-base bearings, the bearing shell or backing is pre-coated with tin, whereas for lead-base bearings, it is pre-coated with lead/tin. The white metal is cast onto the backing while the coating is still molten and allowed to harden from the bond inward.
This reduces the formation of intermetallic compounds at the bearing shell-Babbitt interface by preventing contraction cavities at the bond. The liner is then machined to a predetermined thickness and a mirror-bright polish. A flame arc gun and Babbitt wire can also be used to spray Babbitt onto the bearing shell.
Babbitt Metal Bushings can be found in a variety of applications. High-speed rotating machinery, for example, includes, compressors, schillers, sturbines
locomotives, marine applications, pumps, electric motors and gear drives.