German IBC bearings, IBC models, IBC prices

IBC 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.

IBC bearing features and structure

Common sliding bearing materials 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. Sliding 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 sliding bearings; the magnitude of sliding friction mainly depends on manufacturing precision, while the friction force of sliding bearings mainly depends on the material of the bearing sliding surface. Sliding bearing working surfaces generally have self-lubricating functions; sliding bearings are classified into non-metallic sliding bearings and metallic sliding bearings based on materials. Non-metallic sliding bearings are primarily plastic bearings, which are usually made from high-performance engineering plastics. Professional manufacturers generally 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 sliding bearings were three-layer composite bearings. These bearings typically use carbon steel plates as the substrate, sintering a layer of spherical copper powder onto the steel plate first, and then sintering a layer of PTFE lubricant approximately 0.03mm thick 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.

IBC bearing materials

1) Metallic materials, such as bearing alloys, bronze, aluminum-based alloys, zinc-based alloys, etc. Bearing alloys: Also known as white metals, bearing alloys 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-seizure 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 strips, or cast iron bushings to form a thin coating. 2) Porous metallic materials (powder metallurgy materials): Porous metals are powder materials with a porous structure. If immersed in lubricating oil so that the micropores are filled with oil, they become oil-impregnated bearings 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 plastics: Common bearing plastics include phenolic plastics, nylon, and polytetrafluoroethylene. Plastic bearings have high compressive strength and wear resistance, can be lubricated with oil and water, and have self-lubricating properties, but poor thermal conductivity.

IBC bearing maintenance

During operation, sliding bearings generate friction due to contact between the journal and bearing shell, leading to surface heating, wear, and even seizure. Therefore, when designing bearings, sliding bearing materials with good anti-friction properties should be selected for the bearing shells, appropriate lubricants and supply methods should be used, and the bearing structure should be improved 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 moisture and acid value exceed standards. Journal surface corrosion: Spectral analysis reveals abnormal iron element concentrations; many sub-micron iron-component particles appear in the ferrogram; lubricating oil moisture or acid value exceeds standards. Journal surface scoring: Cutting wear particles or black oxide particles of the iron series are found in the ferrogram, 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 moisture and acid value are abnormal. Bearing surface scoring: Cutting wear particles are found in the ferrogram, with non-ferrous metal composition. Shell surface spalling: Many large-sized fatigue spalling alloy wear particles and layered wear particles are found in the ferrogram. Bearing burn-out: Many large-sized alloy wear 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 sounds fine initially, 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 releases volatile acids at certain temperatures and humidity, causing corrosion and protection issues on metals, forming corrosive substances that cause corrosion damage to sliding bearings. Sliding bearing life is closely related to manufacturing, assembly, and use; every link must be optimized to ensure the best operating state of the bearing, thereby extending its 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, rings may have excessively long turnover times, or the outer circle 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 decline in the price of coated machine bearing steel, the quality of the steel has gradually deteriorated. For instance, the content of non-metallic impurities in the steel is high (increased sulfur content reduces the material's inherent rust resistance), and there are deviations in the metallographic structure. Currently, the sources of coated machine bearing steel used by manufacturers are varied, and the quality of the steel 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 workers violating rust prevention protocols are not uncommon. 5) Rust-proof paper, nylon paper (bags), and plastic tubes used for packaging coated machine sliding 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 sliding bearing rings are too small, and the oxide scale and decarburization layer on the outer circle are not completely removed, which is also a reason.

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