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First, rolling bearing /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
1. The cooperation between the bearing and the shaft adopts the base hole system; the cooperation between the bearing and the outer casing is made by the base shaft system.
The values ​​of bearing scale public service and rotation accuracy are in accordance with the rules of GB307-84.
2. The journal and the bearing inner hole of the bearing cooperate with the bearing according to the rules of GB1031-83; the journal roughness Ra value is less than 1.6 μm; the bearing case inner hole roughness Ra value is less than 2. 5 μm.
3. When making bearing rings and rollers with GCr15 and ZGCr15 steel; the hardness value of the ferrule and roller should be 61~65HRC, when made of GCr15SiMn and ZGCr15SiMn steel; the hardness value should be 60~64HRC. View the method and the uniformity of the hardness of the same part according to the rules of JB1255.
4, to see the radial clearance and axial clearance of the bearing should be in accordance with the rules of GB4604-84.
5. The inner and outer ring raceways of rolling bearings should be free from falling off and severely worn; there should be no cracks in the inner and outer rings, the balls should be free of wear; the cages are not severely deformed; there is no abnormal noise and oscillation during the transition; the stop should be stopped gradually.
6. About the C-class public service tapered roller bearing; the touch precision of the roller and the ferrule raceway; under the effect of the certain load; color viewing; the touch marks should be connected; the touch length should not be smaller than the roller busbar 80.
Second, the sliding bearing
1. Regarding the radial thick-walled tile 1, the bearing gap and the tile interference are measured by the pressure lead method, the lifting shaft method or other methods; the shaft clearance fits the demand; the tile shell interference should be 0 to 0. 02 mm.
2 Check the parts; there should be no damage and cracks; the bearing bush should be free from falling off, pores, cracks, channels and partial wear.
The contact condition of the 3-axis bush and the journal is viewed by the color method; the viewing point should be 60°～90° (the lower limit of the speed is higher than 1000r/min; the upper limit of the speed is lower than 1000r/min). The demand in the touch range Uniform touch; there should be 2 to 4 touch points per square centimeter; if the touch is poor, it is necessary to conduct scraping.
4 cleaning the bearing box; each oil hole dredging; no cracks, leakage appearance.
5W back and bearing housing should be tightly and evenly fitted; view by color method; touch area is not less than 50.
2. The alloy layer and the tile shell of the radial thin-walled tile 1 bearing bush shall be firmly and closely connected; there shall be no delamination or shelling appearance. The surface of the alloy layer and the facets of the two half-watt tiles shall be lubricated and flat; Shortcomings such as cracks, pores, heavy skin, slag inclusions and bumps.
2W back and the inner hole of the bearing housing should be closely and evenly fitted; view by color method; inner diameter is less than 180mm; its touch area is not less than 85; inner diameter is greater than or equal to 180mm; its touch area is not less than 70.
The cooperation gap and touch condition of the 3-axis bush and the journal are ensured by the machining precision; the touch area is usually not allowed to scrape; if the touch is not uniform along the axial direction; it can be slightly trimmed.
4 After installation; use a 0. 02mm feeler gauge at the bisector; it should not be qualified.
3. Regarding the thrust bearing 1 bearing bush should be free from wear, deformation, cracks, scratches, delamination, crushing and burn defects, and the impression at the touch of the thrust plate should be uniform; the touch area should be not less than 70 and the entire circumference of each tile The block is evenly distributed, and the thickness difference of the same group of tiles should not be greater than 0. 01mm; the tile babbitt should be rounded into the oil wedge according to the direction of rotation; in order to facilitate the entry of lubricating oil, the back bearing surface is flat and lubricated.
2 Adjust the gasket should be lubricated, flat, non-flexible, and use a layer of gasket with a thickness difference of not more than 0. 01mm.
3 After the bearing cap is assembled, the thrust bearing method is repeatedly measured by the push shaft method; the value should be within the demand range. It is necessary to measure and use the thrust bearing clearance of the shaft displacement probe to use this method; and adjust according to the rules. Good displacement probe indication zero.
4 bearing shell horizontal contact surface is tight; good position. Oil temperature measuring oil hole and tile cover eye alignment; not skewed. Oil hole clean and clear.
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Skills and specifications for repairing centrifugal pump bearings
Source: Bearing network time: 2017-12-26