Rolling bearing accuracy and grade

The accuracy of the rolling bearing is divided into (main) dimensional accuracy and rotation accuracy. The accuracy level has been standardized and is divided into five levels: P0, P6, P5, P4, and P2.
      The accuracy is increased from the 0th level in order, and is sufficient for the general purpose 0 level, but when used in the conditions or occasions shown in Table 1, an accuracy of 5 steps or higher is required.
      Although the above accuracy level is based on the ISO standard, its name is different in national standards.
      Table 2 lists the accuracy levels applicable to the various bearing types and the comparison between national standards.

      Dimensional accuracy (items related to shaft and housing installation)
      1. Allowable deviation of inner diameter, outer diameter, width and assembly width
      2. Allowable deviation of the diameter of the compound circle and the diameter of the outer complex circle in the roller group
      3, the allowable limit value of the chamfer size
      4, the allowable variation of the width

      Rotation accuracy (items related to the rotation of the rotating body)
      1. Allowable radial runout and axial runout of the inner and outer rings
      2, the inner ring allows lateral runout
      3. Allowable variation of the inclination of the outer diameter surface
      4. Allowable variation of the thickness of the thrust bearing raceway
      5. Allowable deviation and allowable variation of tapered bore

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Analysis: Key technical processes for bearing surface treatment

    1. The main raw materials: ultra-high molecular polyester borane polymer resin; nano-molybdenum disulfide; anti-rust and oil-absorbing nano-group; trace polytetrafluoroethylene and other mixture of nano-powder. All the above raw materials are independently developed by our company and can be produced in small quantities in the laboratory.
    2. Uses: Improve the surface anti-rust ability of the bearing; reduce the surface friction coefficient; comprehensive performance of friction and wear resistance.
    3. Suggestions for use:
    1) Remove the oil from the bearing surface such as rust. 1. Mix with 1% to 3% of the industrial high-efficiency degreasing powder we developed, and put the bearing ring into the liquid to warm it to 70 degrees to 85 degrees. 30 minutes (intermittent stirring), stop heating and wait until the temperature is 40 degrees or so. Dip the bearing ring in water one by one and brush with the brush. In particular, the bearing work surface should be brushed several times. When brushing, the bearing ring can't leave the water surface. Note : This liquid can remove the oil beads floating on the water surface and reuse it once; 2. Rinse twice with water of about 40 degrees, the two rinse waters can be reused; when the oil is heavy, use 3% ratio and re-mixing Wash the liquid twice;
    2) Use LM-1198A super concentrated cleaning solution to remove the lubricating oil immersed in the micropores of the bearing phosphating layer, and let the resin be replaced by molybdenum disulfide. The specific method is 0.5%. Proportion and water with cleaning agent to warm to 85 degrees to 99 degrees (drip down the cleaning agent can be connected to cool, remove the floating oil on the surface after the oil beads can be reused once), soak the bearing workpiece in the cleaning agent with a brush, once Rinse twice with water at a temperature above 70 degrees.
    3). Put the bearing ring with basic dry water into the oven for 60 degrees / 10 minutes and then adjust it to 110 degrees / 10 minutes. The removed high temperature bearing ring is easy to rust. Treatment: Rapid Pour into the sealed barrel, spray a little bit of absolute ethanol (industrial alcohol), pour a layer of thin layer of alcohol (do not spray too much), seal the sealed lid, store the bearing ring Take it in the sealed barrel after it has been cooled. Storage in a sealed barrel is mainly to prevent rust. Take out when you need to apply the paint. Apply as much as you can and apply it to the paint or spray it. As long as the bearing ring is glued to the glue, it will not rust. After taking it, seal the lid in time to minimize the contact of the bearing ring with air.椐 Local environmental humidity or sealing conditions can generally be stored for 3 days to 6 days without rust.

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