German STOEFFL RUDOLF bearings, STOEFFL RUDOLF models, STOEFFL RUDOLF prices

STOEFFL RUDOLF bearings are bearings that operate under sliding friction. Plain bearings operate smoothly, reliably, and without noise. Under liquid lubrication conditions, the sliding surfaces are separated by lubricating oil without direct contact, which can greatly reduce friction loss and surface wear; the oil film also has a certain vibration-absorbing capacity. However, the starting friction resistance is relatively high. The part of the shaft supported by the bearing is called the journal, and the part mating with the journal is called the bearing bush. The anti-friction material layer cast on the inner surface to improve the friction properties of the bearing bush surface is called the bearing lining. The materials of the bearing bush and bearing lining are collectively referred to as plain bearing materials. Plain bearings are generally used in high-speed and light-load operating conditions.

STOEFFL RUDOLF 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 components in relative motion, 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 force mainly depends on manufacturing precision, while the friction force of a sliding bearing primarily depends on the material of the bearing sliding surface. The working surfaces of sliding bearings generally have self-lubricating functions; sliding bearings are classified into non-metallic sliding bearings and metallic sliding bearings based on material. Non-metallic sliding bearings are mainly plastic bearings, which are typically 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 widely 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.

STOEFFL RUDOLF bearing materials

1) Metallic materials, such as bearing alloys, bronze, aluminum-based alloys, and zinc-based alloys. Bearing alloys: Also known as white metal, bearing alloys are primarily composed of tin, lead, antimony, or other metals. Due to their excellent 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 layer. 2) Porous metallic materials (powder metallurgy materials): Porous metals are powder materials with a porous structure. When immersed in lubricating oil, the micropores become filled with oil, creating oil-impregnated bearings with self-lubricating properties. Porous metallic materials have low toughness and are only suitable for steady, non-impact loads and medium to low speeds. 3) Non-metallic bearing materials (plastics): Common bearing plastics include phenolic resin, nylon, and polytetrafluoroethylene (PTFE). Plastic bearings offer high compressive strength and wear resistance, can be lubricated with oil or water, and possess self-lubricating properties, but they have poor thermal conductivity.

STOEFFL RUDOLF bearing maintenance

During operation, plain bearings generate friction due to contact between the journal and the bearing bush, leading to surface heating, wear, and even "seizure." Therefore, when designing bearings, bearing bush materials with good anti-friction properties should be selected, appropriate lubricants and supply methods should be used, and the bearing structure should be improved to achieve thick-film lubrication, etc. Bush 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. Bush 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 particle components being non-ferrous metals. Bush surface spalling: Many large-sized fatigue spalling alloy wear particles and layered wear particles are found in the ferrogram. Bearing bush 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: Paint rust is characterized by a sealed motor sounding fine initially, but after a period 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, 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 coating machine bearings, rust prevention and oil-sealed 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 may come into contact with corrosive liquids or gases. 2) The quality of products such as 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 material 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 coating machine bearing steel used by manufacturers are varied, and the 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 workers violating rust prevention protocols are not uncommon. 5) Packaging materials for coating machine plain bearings, such as rust-proof paper, nylon paper (bags), and plastic tubes, do not meet the requirements for rolling coating machine bearing oil-sealed rust-proof packaging, which is also a factor causing rust. 6) The turning and grinding allowances for the rings of coating machine plain 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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