Model NO.
608zz Deep Groove Ball Bearing
Origin
China
HS Code
84821090
Type:
Ball
Material:
AISI440, 440c, 304
Structure:
Deep Groove
Transport Package:
Carton
Specification:
SGS
Trademark:
fuqin
Materials of Bearings
Bearing ring and roller body are mainly made of high C-Cr bearing steel. Listed below are compositions of material for bearing ring and roller body.
Steel Code | Chemical composition% | ||||||||
| Gcr15 SAE52100 DIN 100 Cr6 JIS SUJ2 | C | Si | Mn | P | S | Cr | Mo | Cu | Ni |
| 0.95-1.05 | 0.15-0.35 | 0.25-0.45 | <0.025 | <0.025 | 1.40-1.65 | - | <0.25 | <0.30 | |
selection of material of cages.
Drawing steel sheet cage
These light cages hold a high strength with reduced friction and wear in an effective way after surface treatment. The following table covers compositions of material for cold-rolled steel sheet.
Steel code | Chemical Composition% | ||||||
| JISG 3141 SPCC | C | Si | Mn | P | S | Ni | Cr |
| <0.12 | - | <0.5 | <0.04 | <0.045 | - | - | |
Cut brass cage is adopted in small and medium bearings. However, brass cage is not suitable for compressors with ammonia cooling due to potential seasonal cracking of brass. It is recommended to replace it with iron cage.
Nylon cage
According to the type and usage of bearings, nylon cages are widely adopted, but they are inappropriate for environments where the temperature is above 120ºC or below 40 ºC. Most of cast molding cages adopt nylon PA66 material, with or without glass fiber reinforcement whose advantage is a good combination of strength and elasticity.
Materials for dust shield and seal ring
Material for dust shield
we use cold-rolled tin plate as the standard mateiral for dust shields, but also use stainless steel of AISI-300 specification at times.
Material for seal ring
Seal rings are mainly made of NBR. For high temperature, fluororubbers and silicon rubbers are widely used as well.
Type | ASTM D1418 Name | Temperature Range | Hardness (Shore A) | Features | Restriction |
| Nitrile butaduene rubber | NBR | -40ºC~120ºC | 40-90 | Low compression High ductility High corrosion resistance superior oil resistance | Unsuitable for high temperature conditions; No exposure to the sun and corrosion of chemicals |
| Silicon rubber | MQ/PMQ VMQ/PVMP | -70ºC~200ºC | 25-80 | High temperature resistance Desiccation resistance Sunshine resistance aging resistance to ozone | Poor surface abrasion performance and crack resistance, higher wear resistance |
| Hydrogenated (nitrile-butadiene rubber) | HNBR/NEM | -35ºC~65ºC | 50-90 | Heat resistance High ductility Chemical resistance | Unsuitable for high temperature conditions and shall avoid exposure to the sun and corrosion of chemicals |
| Fluororubber | FKM/FPM | -28ºC~200ºC | 50-95 | High temperature resistance Significant chemical resistance corrosion resistance to petroleum products | It is not suitable for working conditions of low temperature. |
| ACM rubber | ACM Rubber | -18ºC~175ºC | 40-90 | Stronger resistance to hot oil Sunlight and ozone Higher crack resistance | poor waterproof performance; unsuitable for working condition of ultra-low temperature |
| Warning:fluro rubber is safe and harmless under normal working condition of below 200ºC, but it will give off smoke if the temperature exceeds the ultimate temperature of 300ºC that is equivalent to flame for cutting steel tubes. Inhalation of the smoke is harmful to human bodies including eyes. In addition, the smoke should be avoided to contact skin. | |||||
Lubrication of Bearings
Grease lubrication | Lipid lubricants are much easier to use than oil lubricants. Due to its ciscosity,grease is more durable and only needs simple sealing equipment to contain. Grease is hard to be changed, beacause the usual approach of it is to press grease into device to make fresh grease squeeze used grease out. General speaking, grease with low viscosity primary oil is more suitable for high speed operations at low temperature, while grease with high viscosity primary oil is suitable for heavy load. |
| Oil lubrication | Oil lubrication is more suitbale for applications under conditions of high speed and high temperature, effectively taking the heat generated in operation of bearings away. Viscosity of oil determines the effects of oil lubrication. Low viscosity will lead to inadequate formation of oil film, while high viscosity will increase viscous drag and temperature. In general, the higher rotational speed is the lower viscosity of lubricant oil will be; the larger load is, the higher viscosity of lubricant oil will be. |
| Primary oil | In grease, primary oil accounts for 75-96%. In mass fraction, the performance of grease mainly relies on the nature of primary oil. Particularly when it is with cold flow property and at high temperature, its service life is bound up with primary oil. Grease with low viscosity primary oil is usually applicable to low temperature and low load, while lubrication grease with high viscosity primary oil is applied to high temperature and high load. Primary oil used in grease includes mineral oil and synthetic oil. The commonly used synthetic primary oils contain lipid oil, sythetic hydrocarbon oil, perfluoropolyether, silicon oil and PPO, etc. |
| Thickener | Thickener generally accounts for 4~20% in mass fraction. Its functions are to suspend primaty oil, reduce the flow of primaty oil, and increase adhesion of oil to friction surface. Thickener has two categories: metallic soap base and non-metallic soap base. Critical operating temperature, mechanical stability, water resistance and other properties of grease are determined by thickener, for example, sodium soap base can react with water to form a kind of latex, which can not be applied to running bearing in the atomsphere of high temperature. |
| Additive | In grease, primary oil accounts for 0.5~10%. In mass fraction, which is used for the improvement of operating performance and life of grease. Accordign to the classification by function, it can be divided into thickener(strong adhesion), antioxidant, extreme-pressure additive, corrosion inhibitor,etc. |
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