German SWC bearings SWC models SWC prices

SWC bearings have raceways on both the inner and outer rings, and the inner and outer rings can move relative to each other along the bearing axis. This type of bearing is particularly suitable for withstanding combined loads, i.e., loads acting radially and axially at the same time. The axial load carrying capacity of angular contact ball bearings increases as the contact angle α increases. The contact angle is the angle between the line connecting the contact points of the ball and the raceway in the radial plane and the perpendicular to the bearing axis.

SWC 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. In addition, they convert directional motion into rotary 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 magnitude of friction in 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 mainly plastic bearings, which are generally made from high-performance engineering plastics; specialized manufacturers typically possess self-lubricating modification technologies 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. At the beginning of the twenty-first century, the most widely used metallic sliding bearings were three-layer composite bearings. These bearings generally use carbon steel plates as the substrate, sinter a layer of spherical copper powder onto the steel plate using sintering technology, and then sinter 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, and also provides certain load-bearing and lubricating functions during operation.

SWC 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 metals, 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 bearing shells to form a thin coating. 2) Porous metallic materials (powder metallurgy materials): Porous metals are a type of powder material 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, polytetrafluoroethylene, etc. Plastic bearings have high compressive strength and wear resistance, can be lubricated with oil and water, and also have self-lubricating properties, but poor thermal conductivity.

SWC bearing maintenance

During operation, sliding bearings generate friction due to the contact between the journal and the bushing, leading to surface heating, wear, and even "seizing." Therefore, when designing bearings, sliding bearing materials with good anti-friction properties should be selected for manufacturing bushings, appropriate lubricants should be used with suitable supply methods, and the bearing structure should be improved to achieve thick-film lubrication, etc. Bushing 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 content exceeds standards, and acid value exceeds standards. Journal surface corrosion: Spectral analysis reveals abnormal iron element concentrations, many sub-micron iron-component particles in the ferrogram, and lubricating oil moisture or acid value exceeding standards. Journal surface scoring: Ferrograms contain iron-based cutting wear particles or black oxide particles, and temper colors exist on the metal surface. Bushing back fretting wear: Spectral analysis reveals abnormal iron concentrations, many sub-micron iron-component wear particles in the ferrogram, and abnormal lubricating oil moisture and acid values. Bearing surface scoring: Cutting wear particles are found in the ferrogram, with particle components being non-ferrous metals. Bushing surface spalling: Many large-sized fatigue spalling alloy wear particles and layered wear particles are found in the ferrogram. Bearing bushing burnout: 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: The characteristic of paint rust is that in a sealed motor, the motor sounds fine initially, but after some time in storage, the motor makes very abnormal noises, and severe rusting 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 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 coating machine bearings, rust prevention and oil seal packaging requirements were not strictly followed for rust prevention treatment of coating 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 contacts corrosive liquids or gases. 2) The quality of anti-rust 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 coating 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 the metallographic structure. Currently, the sources of coating 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, small turnover areas making effective rust prevention difficult. Additionally, hot weather and workers violating rust prevention regulations are not uncommon. 5) Rust-preventive paper, nylon paper (bags), and plastic tubes used for packaging coating machine sliding bearings do not meet the requirements for rolling coating machine bearing oil seal rust prevention packaging, which is also a factor causing rust. 6) The machining and grinding allowances for the rings of coating machine sliding bearings are too small, and the oxide scale and decarburized layer on the outer diameter are not completely removed, which is also one of the reasons.

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