The supplementary code and suffix of spherical roller bearing are used to identify some characteristics of spherical roller bearing, including open design of SKF spherical roller bearing, sealed spherical roller bearing and bearing for vibrating machinery:
C2: the radial clearance is less than that of the normal group
C3: the radial clearance is greater than that of the normal group
C4: radial clearance greater than C3
C5: radial clearance greater than C4
C08: rotational accuracy according to ISO tolerance class 5
2Cs: hydrogenated nitrile rubber (NBR) contact seal ring with steel framework on both sides of the Supplementary Code bearing. The outer ring is provided with a lubrication groove and three lubrication holes, and is covered by a plastic belt.
2cs2: fluororubber (FPM) contact seal ring with steel framework on both sides of the bearing. The outer circle of the outer ring is provided with a Supplementary Code lubrication groove and three lubrication holes, and is covered by a plastic belt.
2cs5: hydrogenated nitrile rubber (HNBR) contact seal with steel Supplementary Code skeleton on both sides of the bearing. Others are the same as 2cs2
Ha3: case hardened inner ring
K: Taper hole, taper: 1:12
K30: conical hole, taper: 1:30
P5: dimensional accuracy and rotational accuracy in accordance with ISO tolerance class 5
P6: dimensional accuracy and rotational accuracy in accordance with ISO tolerance class 6
Va406: va405 and inner hole with polytetrafluoroethylene (PTFE) coating
Ve552 (E): there are three equally published threaded holes on one side of the outer ring to connect the lifting device; E indicates that the bearing is equipped with eyebolts
Ve553 (E): same as ve552, but with threaded holes on both sides
Vg114: case hardened pressed steel cage
Vq424: rotation accuracy higher than C08
W: The outer ring has no lubrication groove and lubrication hole
W20: outer ring with three lubrication holes
W26: inner ring with six lubrication holes
W33: outer ring with lubrication groove and three lubrication holes
W64: bearing filled with solid oil
W77: same as W33, but lubrication hole and plug
235220: case hardened inner ring with spiral groove in the inner hole.
The grinding design basis of bearing ring is inner diameter or outer diameter, that is, grinding the inner (outer) diameter first and then the raceway. Taking the inner race as an example, if the inner raceway has asymmetric defects, it is necessary to accurately measure the inner diameter of the part, and calculate the large grinding amount m and the large grinding amount M1 at the defects of the inner raceway.
When M1 ＜ m, the inner ring center offset is required when grinding the inner diameter, and the large offset is M1 / 2, that is, when machining the Supplementary Code inner diameter, the grinding amount is relatively increased in advance for the defect of the inner raceway, and then when grinding the inner raceway,
the defect will be mainly ground and the waste products will be saved. Supplementary Code When M1 ≥ m, it cannot be removed by normal grinding, and the method described in Section 1.1 can be adopted according to the situation.
The center offset grinding is carried out on the premise of ensuring the hardness of parts and the depth of carburized layer. The total offset Supplementary Code cannot be completed in one offset grinding. It is generally divided into several grinding, that is, it is completed through the repeated process of offset trial grinding – Measurement – adjustment of offset – re grinding.
After the defects are ground off, it is re aligned and the ovality is corrected by normal grinding. The efficiency of this method is low, and the operator is required to have a high technical level. However, this method has a high success rate in single machine and single piece production and does not delay the production progress. After several years of practice, the effect is good.