The choice of bearing

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The choice of bearing

The choice of bearing material Bearing material selection is based on the designer bearing conditions and bearing parts of the functional requirements.
Rolling bearings mainly by the rings, rolling elements, cages and other parts of the composition of its parts and materials can be divided into:
(1) ferrule and rolling material;
(2) cage material;
(3) other parts such as rivets, dust caps, seals and other materials.
The materials used for these parts are diverse and, due to their different physico-chemical and mechanical properties, each have different properties to suit the needs of a wide range of operating conditions and environments. Bearing material selection is directly related to the ability to meet the agency’s functions and requirements, bearing performance and fatigue life have a decisive impact. Usually in the case of the right choice of materials, as long as the coordination and installation, lubrication and maintenance of normal, the bearing will get good working performance and meet the reliability requirements.
Here is a brief description of the bearing rings, rolling elements and the application of materials to keep back.
1. Cage materials
(1) The vast majority of bearings are made of steel cage, the most widely used is the low-carbon steel stamping waves, basket-shaped, box-shaped cage for high carbon chromium bearing steel bearing conditions and the environment; Caged stainless steel plate with a cage for corrosion-resistant bearing steel bearing conditions and the environment.
(2) excellent surface finish with non-ferrous metals. Work under high temperature conditions, the use of silicon bronze can be made of solid cage, the working temperature up to 315 degrees Celsius; due to the strength of aluminum than the low brass, light weight, which commonly used aluminum solid brass brackets, mainly for speed Higher, lighter, corrosion-resistant and other conditions.
(3) Cage made of engineering plastic has been greatly developed in recent years, mainly because of its certain corrosion resistance, good self-lubricating property, small frictional resistance, convenient material drawing, low price and easy manufacture. However, Easy to “aging.” Currently used to enhance nylon 66 the most widely used, it can continue to work in the temperature range of -40 to 120 degrees Celsius.
PTFE high strength, good self-lubricating performance, continuous working temperature up to 300 degrees Celsius, phenolic tape has a high mechanical strength, good wear-resistant heat resistance, but expensive, suitable for high-speed spin circumference, temperature For -40 ~ 150 degrees Celsius, instantaneous up to 180 degrees Celsius.
2. Rings and rolling materials
(1) high-carbon chromium bearing steel
The vast majority of bearing rings and rolling elements are made of special steel. Ferrules and rolling elements are made of high-carbon chromium bearing steel (GCr15 and GCr15SiMn with ZGCr15 and ZGCr15SiMn) and the hardness of the parts is as follows:
Ferrules and rollers made of GCr15 and ZGCr15 materials are HRc 61-65 and steel balls HRc 62-66;
Ferrules and rollers made of GCr15SiMn and ZGCr15SiMn materials have HRc 60-64 and steel balls HRc 60-66.
Bearings made of high carbon steel chrome bearing steel are generally suitable for operating temperature range of -40 ~ 130 degrees, oil and grease lubrication is normal. To meet the general machinery requirements.
High carbon chromium bearing steel bearing parts after high temperature back to fire, its adaptation to working temperature up to 250 degrees.
With the progress of smelting technology, high-carbon chromium bearing steel can be used in different smelting methods, such as vacuum smelting technology can greatly reform the inherent quality of steel, especially the oxygen content in steel and the formation of non-metallic inclusions have Obvious decrease. Bearings made from this high-carbon chromium bearing steel have doubled their fatigue life.
According to a large number of experimental comparison data show that different smelting methods obtained GCr15, GCr15SiMn, ZGCr15, ZGCr15SiMn bearing steel bearings.
(2) Carburized bearing steel
Carburized with carbon steel and other ferrules and rolling ring, the hardness: ferrule and rolling body HRc60 ~ 64, generally suitable for the operating temperature range of -40 to 140 degrees Celsius, oil and grease lubrication is normal, can be Large shock and vibration conditions, such as locomotives and rolling mill bearings, etc., but the steel heat treatment process is more complicated.
(3) heat-resistant bearing steel
Roller with ferrule made of heat-resistant bearing steel, its hardness: ferrule and roller HRc60 ~ 64, ball HRc61 ~ 65, under normal lubrication, suitable for working temperature of 120 to 250 degrees Celsius, Such as aircraft engines, gas turbines and other spindle working conditions.
(4) corrosion-resistant bearing steel
Ferrules and rolling elements are made of corrosion-resistant bearing steel and have a hardness of not less than HRc58 for ferrules and rolling elements. It is suitable for corrosive media such as water, nitric acid and chemical reagents at a temperature of -253 to 350 ° C.

By | 2017-12-29T03:30:08+00:00 29 12 月, 2017|Uncategorized|0 Comments

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