China’s CNC machine tool parts and components functional industry urgently needs to develop common English of machinery: selection of rolling bearing types Abstract: China’s CNC machine tool parts and components functional industry urgently needs to develop common English of machinery: processing methods Shandong Yantai global group launched CNC turret tool holder high-performance smelting high-speed steel based on MSC An improved analysis of the handling stability of a MPV in Adams a new type of high-precision die material came out in Beijing R14 common system variable setting skills guard against “NC education”
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of non relieving forming milling cutter capable of compensating cutting edge wear characteristics of high efficiency small and medium-sized lathes in Japan gear shaper cutter cadprocam based on VB environment — differential calculation method of positioning error in multi axis professional NC machining selection type rolling bearing life basic function contact relative deformation basic concept terminology life a set of rolling bearing a washer rolling material has a fatigue expansion The number of revolutions of one washer relative to the other washer is reliable, the bearing life is reliable, a group of rolling bearings operating under the same conditions is close to the same, and it is expected to exceed the specified life percentage.
and the bearing washer is relative to the load with the probability of exceeding the specified life
（1） Basic concepts and terms
1. Life span
It refers to the number of revolutions of one ring (or washer) relative to the other ring (or washer) of a rolling bearing before the material of one ring (or washer) or rolling element shows signs of fatigue expansion.
2. Reliability (i.e. reliability of bearing life)
It refers to the percentage that a group of nearly the same rolling bearings operating under the same conditions expect to reach or exceed the specified service life. The reliability of a single rolling bearing is the probability that the bearing reaches or exceeds the specified service life.
The load acting on the bearing when the relative rotation speed of the bearing ring or washer is zero (centripetal or thrust bearing) or when the raceway element has no movement in the rolling direction (linear bearing).
The load acting on the bearing when the bearing ring or washer rotates relative to each other (centripetal or thrust bearing) or when the rolling element moves in the rolling direction (linear bearing).
Life prediction based on radial basic dynamic load rating or axial basic dynamic load rating.
Rated life associated with 90% reliability.
It refers to the assumed constant radial load that a set of rolling bearings can bear, and the basic rated life under this load is one million revolutions. For single row angular contact bearings, the load refers to the radial component of the load causing pure radial displacement between bearing rings.
It refers to the constant central axial load assumed to act on the rolling bearing. Under this load, the basic rated life of the rolling bearing is one million revolutions.
It refers to a constant radial load (or central axial load). Under this load, the rolling bearing has the same service life as the actual load.
It refers to the radial static load (or central axial static load) corresponding to the total permanent deformation of rolling element and raceway. If the roller and raceway (roller bearing) are or are assumed to be normal bus (full line contact) under zero load, the total permanent deformation at the contact between the rolling element and raceway under large contact stress is 1 / 10000 of the diameter of the rolling element. For single row angular contact bearings, the radial rated load is the radial component of the load causing the pure radial displacement of the bearing rings relative to each other.
The radial static load (or central axial static load) will make the total permanent deformation at the contact between the rolling element and the raceway under high stress the same as that under the actual load.
