First, the center shift method
    
1, the rescue of the bearing ring inner, outer diameter
   
First accurate measurement of the size of the parts exist various defects (asymmetric type), to calculate the minimum mill quantity (to the finished size deviation of the mill volume) M, and then grinding the parts center offset ( offset toward the direction of the defect increases the wear amount), the maximum offset for M / 2, that the defect is relatively increase the amount of grinding, key grinding.
    
2, to save the ring inner, outer raceway
    
Design basis of the bearing ring grinding ID or OD, first grinding (external) diameter grinding raceways within the circle, for example, if the inner raceway asymmetric type defects, the need to accurately measure the Part diameter size, and calculated the maximum grinding amount of M, and the inner raceway defect grinding (M1). Would need when the M1     
Center offset method grinding in part hardness, under the premise of the case depth, the total offset can not be completed in time offset grinding, generally divided into several grinding through the offset test grinding - measurement - to adjust the offset - try grinding the iterative process to complete, to be defective worn after the re-alignment, the normal grinding correct ellipticity. The low efficiency of this approach requires the operator to have a higher technical level, but using this method to save the higher rate of success in stand-alone, single-piece production, do not delay the production schedule. Verified by several years of practice to good effect.
    
Second, the heat treatment rose-shaped method
    
Quenching of the bearing steel quenched martensite, a small amount of undissolved secondary carbides and about 12% to 14% of retained austenite. Quenched martensite and retained austenite is unstable organization, the volume contraction of the steel in the tempering process of martensite decomposition, the decomposition of residual austenite steel volume swell.
    
As the tempering temperature increased, the residual austenite decomposition rate increases, an appropriate increase in the tempering temperature conditions to ensure that the process requirements hardness, retained austenite decomposition into a larger specific volume of martensite organization that enhances the processing volume of the corresponding increase, relative to the outer diameter grinding increased, the bearing ring defects in part of a waste under normal grinding conditions can be saved using this method.
   
This method for the residual austenite content of thick, heavy workpieces (especially for Spherical Roller Bearings) effect than significant. Actual production for the different specifications, different sizes, different thickness of the parts developed different tempering process, under the premise of the hardness and deformation of the organization into full, resulting in a large rose-shaped, with a corresponding increase the amount of grinding, to save waste .
    
Third, the chemical deposition method
    
Exceed the design standards for dimensional tolerances bearing parts, can be used chemical deposition method to save. The principle of chemical deposition through a variety of chemical reactions between the chemical raw materials, even in parts of the surface to produce a certain thickness of the metal coating to ensure the original hardness and mechanical properties of the metal layer and the part the same by additional tempering. Chemical deposition only increase the size of the part, does not change the shape of the tolerances of the parts, so for dimensional tolerances tolerance parts, using chemical deposition is an effective method to save the maximum unilateral deposition thickness up to 0.1mm.



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