German MCGILL bearings, MCGILL models, MCGILL prices

MCGILL bearings can simultaneously withstand radial and axial loads. They can operate at higher speeds. The greater the contact angle, the higher the axial load capacity. The contact angle is the angle between the line connecting the contact points of the ball and raceway in the radial plane and the perpendicular to the bearing axis. High-precision and high-speed bearings typically use a 15 degree contact angle. Under axial force, the contact angle increases.

MCGILL bearing features and structure

Common materials for plain bearings include bearing alloys (also known as Babbitt metal or white metal), wear-resistant cast iron, copper-based and aluminum-based alloys, powder metallurgy materials, plastics, rubber, hardwood, and carbon-graphite, polytetrafluoroethylene (Teflon, PTFE), modified polyoxymethylene (POM), etc. Plain bearings absorb and transmit forces between relatively moving parts, maintaining the position and positioning accuracy of the two parts. Additionally, they convert directional motion into rotational motion (such as in reciprocating piston engines). Sliding friction occurs during the operation of plain bearings; the magnitude of sliding friction primarily depends on manufacturing precision, while the magnitude of friction in plain bearings primarily depends on the material of the bearing sliding surface. Plain bearing working surfaces generally have self-lubricating functions; plain bearings are classified into non-metallic plain bearings and metallic plain bearings based on material. Non-metallic plain bearings are mainly plastic bearings, which are generally made from high-performance engineering plastics. Professional manufacturers typically possess self-lubricating modification technology for engineering plastics, enhancing them with fibers, special lubricants, glass beads, etc., to achieve specific performance levels, and then processing the modified plastics into self-lubricating plastic bearings via injection molding. In the early twenty-first century, the most commonly used metallic plain bearings were three-layer composite bearings. These bearings generally use carbon steel plates as the substrate, sintering a layer of spherical copper powder onto the steel plate, and then sintering a layer of approximately 0.03mm PTFE lubricant onto the copper powder layer. The intermediate layer of spherical copper powder primarily serves to enhance the bonding strength between the steel plate and PTFE, while also providing certain load-bearing and lubricating functions during operation.

MCGILL bearing material

1) Metallic materials, such as bearing alloys, bronze, aluminum-based alloys, zinc-based alloys, etc. Bearing alloys: Bearing alloys, also known as white metal, are primarily alloys of tin, lead, antimony, or other metals. Due to their good wear resistance, high plasticity, good conformability, good thermal conductivity, good anti-scuffing properties, and good oil adsorption, they are suitable for heavy-load and high-speed conditions. Bearing alloys have low strength and are relatively expensive; they must be cast onto bronze, steel backing, or cast iron bearing shells to form a thin coating. 2) Porous metallic materials (powder metallurgy materials). Porous metallic materials: Porous metal is a powder material with a porous structure. If immersed in lubricating oil so that the micropores are filled with oil, it becomes an oil-impregnated bearing with self-lubricating properties. Porous metallic materials have low toughness and are only suitable for smooth, non-impact loads and medium to low speeds. 3) Non-metallic bearing materials - plastics: Common bearing plastics include phenolic plastics, nylon, and polytetrafluoroethylene (PTFE). Plastic bearings have high compressive strength and wear resistance, can be lubricated with oil and water, and also possess self-lubricating properties, but they have poor thermal conductivity.

MCGILL bearing maintenance

During operation, plain bearings generate friction due to contact between the journal and the bearing shell, leading to surface heating, wear, and even 'seizure.' Therefore, when designing bearings, one should select plain bearing materials with good anti-friction properties for the bearing shell, use suitable lubricants and supply methods, and improve the bearing structure to achieve thick-film lubrication. Shell surface corrosion: Spectral analysis reveals abnormal concentrations of non-ferrous metal elements; many sub-micron wear particles of non-ferrous metal components appear in the spectrum; lubricating oil has excessive water content and acid value. Journal surface corrosion: Spectral analysis reveals abnormal iron element concentrations; many sub-micron iron-component particles appear in the ferrogram; lubricating oil has excessive water content or acid value. Journal surface scoring: The ferrogram contains iron-based cutting abrasive particles or black oxide particles, and temper colors exist on the metal surface. Shell back fretting wear: Spectral analysis reveals abnormal iron concentrations; many sub-micron iron-component wear particles appear in the ferrogram; lubricating oil water content and acid value are abnormal. Bearing surface scoring: Cutting abrasive particles are found in the ferrogram, with non-ferrous metal composition. Shell surface spalling: Many large-sized fatigue spalling alloy wear particles and layered abrasive particles are found in the ferrogram. Bearing shell burnout: Many large-sized alloy abrasive particles and black metal oxides are present in the ferrogram. Bearing wear: Due to the metal characteristics of the shaft (high hardness, poor compliance), it is prone to adhesive wear, abrasive wear, fatigue wear, fretting wear, etc. Prevention of paint rust: Paint rust is characterized by a sealed motor that initially sounds fine, but after some time in storage, the motor develops very abnormal noises, and severe rust is found upon removing the bearing. Many manufacturers consider this a pre-bearing issue; the main problem is that insulating varnish volatilizes acids at certain temperatures, causing corrosion and protection issues with humidity and metal, forming corrosive substances that cause corrosion damage to plain bearings. Plain bearing life is closely related to manufacturing, assembly, and use; every link must be optimized to ensure the best bearing operation, thereby extending bearing service life. 1) During the production of coated machine bearings, rust prevention and oil seal packaging requirements were not strictly followed for rust prevention treatment of coated machine bearing parts during processing and finished coated machine bearings after assembly. For example, if the turnover time for rings is too long, the outer diameter of the outer ring may come into contact with corrosive liquids or gases. 2) The quality of rust-preventive lubricating oils and cleaning kerosene used in production does not meet the requirements specified by process technology. 3) Due to the continuous price drop of coated machine bearing steel, the quality of the steel has gradually declined. For instance, the content of non-metallic impurities in the steel is high (increased sulfur content in steel reduces the material's inherent rust resistance), and there are deviations in metallographic structure. Currently, the sources of coated machine bearing steel used by manufacturers are varied, and steel quality is mixed. 4) Poor environmental conditions, high content of harmful substances in the air, and small turnover areas make effective rust prevention difficult. Additionally, hot weather and violations of rust prevention protocols by production workers are not uncommon. 5) Rust-preventive paper, nylon paper (bags), and plastic tubes used for packaging coated machine plain bearings do not meet the requirements for rolling coated machine bearing oil seal rust prevention packaging, which is also a factor causing rust. 6) The turning and grinding allowances for coated machine plain bearing rings are too small, and oxide scales and decarburized layers on the outer diameter are not completely removed, which is also a reason.

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