Rolling bearing ring and rolling body, one side again and again under high contact pressure, accompanied by sliding of rolling contact.
Retainer, one side and on either side of the ring and rolling body, or its one side sliding contact, one side under tension and compression force.
Therefore, the bearing ring, rolling element and cage materials, properties, main requirements are as follows.
Ring, rolling body materials required by the performance: rolling fatigue strength high hardness, high resistance to friction consumption cage material performance required by the size stability, good mechanical strength and good workability.
According to different purposes and demands of its, impact resistance, heat resistance, good corrosion resistance.
Ring and rolling body material: ring and rolling body usually use high carbon chromium bearing steel.
Most of the bearing, using JIS SUJ2 steel grade.
Use SUJ3 large bearing.
The chemical composition of SUJ2, around the world, as a bearing material has been normalized.
For example: with AISL52100 (
The United States)
DIN100Cr6 (
West Germany)
BS535A99 (
The UK)
All belong to the same steel.
Further need impact resistance, used as a bearing material nickel chrome steel, chrome molybdenum steel, chrome molybdenum steel, using carbon quenching, make the steel from the surface to the appropriate depth has a hardening layer.
With appropriate hardening depth, fine structure, suitable hardness hardness of surface and the core permeability of coal bearing, than using the bearing steel bearing has excellent resistance to impact, the average permeability coal bearing steel chemical composition.
NSK implemented a vacuum degassing treatment, so, the materials used in the clean degree is high, less oxygen content, good quality.
Then use the appropriate heat treatment, make the bearing rolling weakness of life improved significantly.
The steel grade, according to the special purpose, also use the excellent heat resistance of high speed steel, good corrosion resistance of stainless steel.
Cage materials: punch retainers material, using low carbon steel.
According to different purposes, also used brass, stainless steel plate.
Cutting system maintains a material, the use of high-intensity brass, carbon steel, and also the use of synthetic resin.
Cylindrical roller bearing cylindrical roller and race is line contact, the radial load capacity is big, which is applicable to under heavy load and shock load, also applies to N type high speed rotation and axial movement, NU type can be able to adapt to shaft caused by thermal expansion or installation error and shell the change of relative position, the adaptation is used as the free end bearing can withstand a certain degree of NJ and NF type one-way axial load, NH type and NUP type two-way axial load can withstand a certain degree of inner ring and outer ring can be separated, convenient disassembly NNU model and NN model of radial load resistance strong rigidity, most is mainly used for machine tool spindle cage: stamping steel cage,
Z)
Cut, copper alloy cage, pin type
