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NSK bearings material selection are designers based on bearing operating conditions and bearing of the functional requirements. Main rolling bearing rings and rolling elements, cages and some other parts of the composition, whose parts can be divided into:
(1) ring and rolling element materials;
(2) the cage material;
(3) other parts such as rivets, dust covers, seals and other materials.
These parts using a variety of materials, due to their physical-chemical and mechanical properties are different, have different characteristics, to adapt to different working conditions and environment requirements. NSK bearing material selection the right whether or not directly related to the needs of body functions and requirements, on fatigue life of bearing performance and have a decisive influence. Usually material to choose the right case, as long as the normal coordination and installation, lubrication and maintenance, bearings will have good working performance and meet the reliability requirements.
Summary of bearing rings and rolling elements and materials ' application.
1. ring and rolling element materials
(1) high-carbon chromium bearing steel
Most of the bearing rings and rolling elements are colored with special steel. Made of high-carbon chromium bearing steel (GCr15 and GCr15SiMn and ZGCr15 and ZGCr15SiMn) the manufacture of rings and rolling, the hardness of parts is as follows:
GCr15 rings and rollers and ZGCr15 materials for HRc61~65 steel ball HRc62~66;
GCr15SiMn and ZGCr15SiMn materials ring and roller HRc60~64, steel ball HRc60~66.
Made from high carbon chromium bearing steel bearings are generally suitable for working temperature range is-40~130du, oil and grease lubrication is normal. Meet the General requirements of the machinery.
High carbon chromium bearing steel parts back out after the high temperature, it fits the working temperature can be as high as 250 degrees.
With the advances in smelting technology, can use a variety of high carbon chromium bearing steel smelting, such as vacuum smelting technology, significant reform to quality for steel, especially steel and oxygen in the formation of non-metallic inclusions are significantly reduced. With this kind of high-carbon chromium bearing steel in manufacture of bearings, their fatigue life can grow exponentially.
According to a lot of test data showed that different refining methods to obtain bearing steel GCr15, GCr15SiMn, ZGCr15, ZGCr15SiMn bearings.
(2) carburizing steel
Carburized bearing rings and rolling steel manufacturing, its hardness as: rings and rolling as HRc60~64, general fitness and the operating temperature range is-40~140sheshidu, oil and grease lubricated properly, can be used in greater impact under the condition of vibration, such as rolling stock and NSK bearing used in rolling mills, etc, but the steel heat treatment process more complicated.
(3) heat-resistant steel
Use heat-resistant bearing rings of steel rolling, its hardness: rings and roller HRc60~64, steel ball HRc61~65, lubrication under normal conditions, suitable for working temperature is 120~250sheshidu, such as aircraft engines, gas turbines and other spindles work conditions.
(4) the corrosion of bearing steel
Corrosion resistant steel bearing rings and rolling steel manufacturing, its hardness as: rings and rolling elements should not be lower than HRc58, suitable for corrosive mediums, such as water, nitric acid, chemical reagents, temperature of-253~350sheshidu.
2. cage material
(1) the vast majority of NSK bearings are made from steel cage, is the most widely used low-carbon steel sheet stamping Ribbon, box-shaped, box-shaped cage, suitable for high carbon chromium bearing steel bearing condition and environment; carbon cage stainless steel plate stamping applied in corrosion resistant steel bearings steel bearing operating conditions and environments.
(2) non-ferrous metals high quality smooth surface. Working in hot conditions, can be made of Silicon bronze cage, operating temperature up to 315 degrees Celsius; lower than brass because of aluminum's strength, light weight, and thus commonly used aluminum in place of copper manufactured solid cages, mainly used in high speed, light weight, corrosion conditions.
(3) with a cage of engineering plastics manufacturing, and large developments in recent years, mainly because it has a certain degree of corrosion resistance, good self-lubricating properties, friction resistance, selects material conveniently, price, manufacturing advantages such as easy, but easy to "aged". Current reinforced nylon 66, the most widely used, it can continue operating temperature range is-40~120sheshidu.
PTFE and high strength, good self-lubricating properties, continuous operating temperatures up to 300 degrees Celsius, phenolic adhesive tape has high mechanical strength, good wear-resistance heat resistance, but costly, for high-speed spin around, working temperature is-40~150sheshidu, instantaneous up to 180 degrees
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| NNU4952 NTN | 260 | 360 | 100 |
| NNU4948K NTN | 240 | 320 | 80 |