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Determination of machining allowance after quenching of outer ring of carburized steel bearing
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1 The calculation of the elastic retraction amount is known from the production theory; the size of the elastic retraction of the carburized steel bearing ring is related to the wall thickness and diameter of the workpiece. The empirical formula of the elastic retraction amount summarized is d=26B4/ D3 (1)
Where: B The maximum wall thickness of the workpiece D The outer diameter coefficient of the ferrule 26 is under the condition of rotary quenching of the stamper; it is derived from repeated theoretical data.
Formula (1) is suitable for workpieces with an outer diameter in the range of 200 to 300 mm.
2 The remaining amount after turning of the outer race is determined by the margin after turning; the influence of the elastic retraction basin; the greater the elastic retraction; the more the margin is rougher. After the production theory and theoretical analysis, it is known; The allowance (H?D)1 after the turning of the raceway is related to the thickness-to-diameter ratio of the workpiece; that is, H?D1âˆD/B.
The quantitative expression is H?D1=0.042D/B (2)
The coefficient 0. 042 is derived from repeated theoretical data.
3 The theoretical grinding quantity after quenching is theoretically known. The elastic retraction amount does not change due to the slight increase or decrease of the allowance after turning; therefore, the theoretical grinding amount after quenching should be H?D2=H?D1+d (3)
4 Accounting example is known that the maximum wall thickness of the outer ring of the 197726 bearing B=18.85mm; the outer diameter D=230.9mm, the allowance after the outer raceway turning? D1=0.65; after reasonable turning The remaining amount and the amount of grinding after quenching; and verify the suitability of the original value.
Solution: The elastic retraction amount obtained by the formula (1) is d=26B4/D3=26×18.854/230.93=0.266
The margin after turning by formula (2) is H?D1=0.042D/B=0.042×230.9/18.85=0.514
The theoretical amount of grinding after quenching from equation (3) is H?D2=H?D1+d=0.266+0.514=0.78
The value of the residual basin after the original outer ring of the standard bearing outer ring is D1=0.65; the measured grinding amount after quenching is 0.9; the difference from the accounting result is 0.77; thus the original value It is not suitable. The remaining amount is taken as D1=0. 5, and the measured grinding amount after quenching is 0.76; the accounting result and the measured condition are very close to clarify that the latter value is reasonable.
It is worth noting that the scale of the quenching die should be the same as that of the turning diagram; the theory proves that the amount of shortening when the carburized steel bearing ring is quenched is enough to reach the shaping effect.
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