Compared with ordinary bearings, stainless steel bearings not only have obvious advantages in material, but also in terms of technology and precision control, they are much stricter than ordinary bearings. During the working process, the stainless steel bearing has stable operation, low noise, corrosion resistance and wide application.
Stainless Steel Bearing Characteristics
The bearing rings and rolling elements are made of AISI SUS440C stainless steel (domestic grades: 9Cr18Mo, 9Cr18) after vacuum quenching and tempering, and the cage and sealing ring skeleton materials are AISI304 stainless steel (domestic grades: OCr18Ni9). Compared with ordinary bearing steel, stainless steel bearings have stronger anti-rust and anti-corrosion properties.
Choose appropriate lubricants, dust caps, etc., and can be used in the environment of -60°C~+300°C. Stainless steel deep groove ball bearings are resistant to corrosion caused by moisture and several other media. These single row deep groove ball bearings, like standard deep groove ball bearings made of carbon-chromium (rolling bearing) steel, have deep bearing raceway grooves, and the fit between the bearing raceway and the ball is extremely high. Stainless steel bearings are widely used in food processing, medical equipment, pharmaceutical machinery due to their high mechanical strength and large load capacity.
The main purpose of stainless steel bearings
Medical equipment, cryogenic engineering, optical instruments, high-speed machine tools, high-speed motors, printing machinery, food processing machinery.
1. What is a stainless steel bearing
Stainless steel bearings, as the name suggests, are bearings made of stainless steel. Compared with ordinary materials, stainless steel bearings are relatively more advantageous. During the working process, the stainless steel bearing works stably, with low noise, corrosion resistance and wide application. There are also obvious advantages in materials. In terms of technology and precision control, they are also stricter than ordinary ones.
Second, the characteristics of stainless steel bearings
The raw materials of bearing rings and rolling elements are made of AISISUS440C stainless steel, which is quenched and tempered in a vacuum environment, and the cage and sealing ring frame are made of AISI304 stainless steel. Compared with ordinary bearing steel, stainless steel shaft has stronger anti-rust and anti-corrosion. Select suitable lubricating fluid, dust cover, etc., which can be selected under the ring mirror of -60 ℃~+300 ℃. Stainless steel deep groove ball bearings resist corrosion caused by moisture and many other media. This type of single row deep groove ball bearing is the same as the standard deep groove ball bearing made of carbon-chromium rolling bearing steel.
In addition, in terms of processing technology, it is much more precise than the general bearing support. Stainless steel bearings are extremely stable during operation and have very little noise. Its applications are extremely extensive: medical machinery, optical equipment, high-speed machine tools, printing equipment, food industry machinery, etc.
Third, the advantages of stainless steel bearings
1. Excellent corrosion resistance: stainless steel bearings are not easy to rust and have strong corrosion resistance.
2. Washable: The stainless steel bearing can be washed off without water stains without the need to use lubricant again to prevent the punishment of rusting.
3. Can run in liquid state: Considering the selected materials, we can directly put the bearing and bearing seat into the liquid to run.
4. Slow depletion rate: AISI316 stainless steel material does not require oil or grease for corrosion protection. Therefore, if the speed and load are low, lubrication is not required.
5. Hygiene: The stainless steel material is natural and clean and does not corrode.
6. Low noise: stable operation and low noise under the premise of ensuring the proper mechanical properties of the bearing.
7. High temperature resistance: Stainless steel bearings are fitted with high temperature polymer cages or without cages in a complete complementary structure, capable of operating at higher temperatures ranging from 180°F to 1000°F. (Requires high temperature resistant grease) Stainless steel bearing classification 440 stainless steel bearing series 316 stainless steel bearing 304 stainless steel bearing Stainless steel bearing is mainly used for medical machinery and machinery.
Fourth, the classification of stainless steel bearings
1.400C stainless steel bearing
High mechanical strength and large load capacity
2.420 stainless steel bearing
This bearing has certain wear resistance and corrosion resistance, extremely high hardness, and the price is lower than the stainless steel ball.
3.304 stainless steel bearing
The whole bearing is made of ALSLSUS316L or SUS304 material. Since austenitic stainless steel cannot be hardened as a whole, this bearing is not suitable for larger loads and higher speeds.
4.316 stainless steel bearing
It has good corrosion resistance and can be used in a strong environment, and it will not be attracted by a magnet.
5.316L stainless steel bearing
It can be completely non-magnetic and will not rust in seawater.
5. Popular science of stainless steel bearings
Stainless steel bearings have been tested for their service life before shipment, but due to differences in natural environment or usage, the service life of bearings is actually slightly different. Some bearings have problems before they reach their end of life and must be replaced early. The following will introduce which fault conditions need to be replaced by stainless steel bearings. The precursors of faults can be analyzed in the following situations.
Common faults of stainless steel bearings can be identified based on sound, and sufficient experience is required to identify based on sound. Sufficient training is required to be able to distinguish between bearing noise and non-bearing noise. Therefore, as far as possible, this task should be carried out by professionals. The sound of the bearing can be clearly heard by sticking the earphone or sound bar on the casing.
6. Reasons for the failure of stainless steel bearings
The main reasons for the failure of stainless steel bearings are defects and overload. When the applied load exceeds the strength limit of the material, the part fracture is called overload fracture. The main reason for overload is the sudden failure of the host or improper installation. Defects such as micro-cracks, shrinkage holes, air bubbles, large foreign debris, overheated tissue and local burns in bearing parts will also cause fractures at the defects during shock overload or severe vibration, which is called defect fracture.
It should be pointed out that during the manufacturing process of the bearing, the re-inspection of the raw materials, the quality control of forging and heat treatment, and the control of the processing process can be accurately analyzed by instruments to determine whether the above defects exist, and the control must be strengthened in the future. But in general, most of the common stainless steel bearing fracture failures are overload failures.
