The accuracy of bearing level with centrifugal pump bearing technology standard

Bearing level of accuracy and precision of the rolling bearing points by the standard of ( The main) Dimensional accuracy and rotation accuracy. Precision grade has been standardized, divided into a level 0, 6 x, 6, 5, 4, 2 levels of six grades. Since a level 0, in turn, improve accuracy, for general purpose level 0 is enough, but when used for other conditions or situations, needs to be level 5 or higher precision. Although more accuracy grade is set by the ISO standards as a benchmark, but its name standards in different countries in the world, 1 rolling bearings, bearing and shaft with the base hole system, with the bearing and the shell adopts the basic shaft system. Bearing dimensional tolerance and revolving tolerance values according to GB 307 - The provisions of the 84. 2, cooperate with bearing journal and bearing of the hole in the cabinet according to GB 1031 - The provisions of the 83 journal roughness Ra value is less than 1. 6 microns, bearing hole roughness Ra value is less than 2 in the box. 5μm。 3, made of GCr15 and ZGCr15 steel bearing ring and roller, the ring and roller hardness value should be 61-65 HRC; With GCr15SiMn and ZGCr15SiMn steel manufacturing, its hardness value should be 60 ~ 64 HRC. Hardness test and the uniformity of the hardness of the same parts as JB1255 rules. 4, check the bearing radial clearance and axial clearance should comply with the GB 4604 - The provisions of the 84. 5, rolling bearing inner and outer ring raceway should be no peeling, serious wear and tear, can not have both internal and external ring crack; Ball should be no wear, keep no serious deformation, turns, no abnormal noise and vibration should be gradually stop stop. 6, for C grade tolerance of tapered roller bearings, roller and ring raceway contact precision, to a certain load, under the action of staining examination, contact traces should be continuous, contact length should not be less than 80% of roller busbar. 2, 1, thick wall tile (1) for radial sliding bearing by pressing lead, lift shaft or other way to measure the bearing clearance and tile shell interference, axial clearance requirements, tile shell interference quantity should be 0 ~ 0. 02mm。 (2) the test parts, no damage and crack, bearing should be no peeling, porosity, crack, slot and partial grinding burns. (3) bearing condition of contact with the shaft neck with coloring method to check, check that the Angle should be free of 60 ° ~ 90 ° ( Speed higher than 1000 r/min take lower limit, take limit speed below 1000 r/min) 。 In uniform requirements within the scope of contact, each square centimeter should be 2 ~ 4 point of contact, if poor contact, you must adjust their research. (4) cleaning the bearing box, the oil hole open, can not have crack, leakage phenomenon. (5) back and bearing seat should be closely even joint, check with coloring method, and contact area of not less than 50%. 2, for radial thin wall tile (1) bearing alloy layer and tile shell should be closely combined with, can not have layered, hulling phenomenon. Alloy layer in the surface and two and a half points surface should be smooth, flat, there is no crack, air hole, double skin, slag inclusion, and defects such as bruised. (2) the tiles back with close even joint bearing inner hole surface should be, check with coloring method, and the inner diameter of less than 180 mm, the contact area of not less than 85%, the inner diameter is greater than or equal to 180 mm, the contact area of not less than 70%. (3) fitting clearance of bearing and shaft neck and the status of the contact is by machining, guarantee the precision of the contact area generally are not allowed to study, if uneven along the axial contact, can be a little nap. (4) after the assembly, in the split with 0. 02 mm feeler check, should not into to be qualified. 3, for thrust bearing (1) bearing shell should be no wear, deformation, cracks, scratches, delaminating, roller compaction and burn defect; Contact with thrust plate mark should be uniform, contact area should not be less than 70% and the entire circumference of each tile uniform; Group segment thickness difference should not be greater than zero. 01 mm, tile babbit should according to the direction of rotation round the oil wedge, and lubricating oil into; The back of the bearing surface level off is smooth. (2) adjusting washers shall be smooth, level off, don't bend, with the thickness difference is not greater than zero. 01 mm layer of the gasket. (3) in the bearing cover assembly after repeated use method measuring thrust bearing axial clearance, its value should be within the scope of the requirements. Using this method and measured in axial displacement of the probe lateral thrust bearing clearance must be consistent, and adjust the displacement sensor in accordance with the provisions of the instructions to zero. (4) level in combination with surface bearing shell, nice place. Measure the oil temperature of oil hole and tiles alignment, not skewed. Clean oil hole open.