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Koyo bearing cracking edge and cracking failure improvement
Source: China Bearing Network Time: 2017-10-03
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1. There are non-metallic inclusions in the koyo bearing workpiece data; the inclusions are equivalent to the natural gap; the stress is gathered under the external force; the workpiece cracking failure is caused.
2. There is a micro-channel defect in the koyo bearing workpiece data; it is actually a micro-crack source; under the action of external force; when the stress concentration is greater than the shear strength of the workpiece; the crack source expands into the metal internal crystal, but the brittleness is arranged due to the tension of the large spring Large; shortcomings are severe;
3. There is a lack of product description. On the one hand, the surrounding ratio is too small. 3.3; the surrounding ratio is small to increase the internal stress of the spring, and on the other hand, the hardness is high; the general spring-wrap ratio is 4 25; the hardness is 44 48HRC. When the rounding ratio is reduced, the hardness should be reduced accordingly; the suitable spring value should be 42 45HRC; it can compensate for the lack of surrounding low.
4. It is found that the koyo bearing workpiece arrangement is overheated; the grain is coarse; the ferrite is scattered along the crystal; the grain boundary strength is low; the brittleness is large. This is an important reason for the workpiece to break under the action of external force.
Bearing crack failure improvement:
1. Choose the standard furnace capacity. 40 quenching and heating per furnace; avoiding the lack of quenching heating and the disadvantage of koyo bearing workpiece accumulation, which can not be kept at the time of aging, as well as aging;
2. During quenching; the quenching treatment is selected to be cooled by oil; the workpiece is prevented from cooling too slowly; the shortcomings of the arrangement are not sufficient to reduce the function of the workpiece. The oil is cooled and cooled; because the oil is less; the oil temperature is not warmed up; When cooling, the workpiece Y' phase can be fully dissolved in the phase; the arrangement is completely changed; the workpiece function is excellent after disposal. After the improvement of the process method is selected; the heat treatment quality of the NSK imported bearing parts is outstanding; the hardness of the workpiece reaches the skill demand target; normal.
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