Normalizing of the ferrule

Source: Bearing network time: 2018-04-17

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Heating the steel to a temperature of 30 to 50 Â° C above the austenitizing temperature; keeping it warm; making it completely austenitized; then air cooling (sometimes supplemented with blowing; spraying, etc.); to obtain fine pearlite or sorbite Arranged heat treatment process; called normalized fire.
1. The intention of normalizing (1) Adjusting the hardness of steel: Some bearing products have good anti-tempering performance; they must have higher hardness after quenching after 200~250 Â°C; optional annealing after normalizing; Pearlite arrangement.
(2) Elimination of reticulated carbides and line-like arrangements: when the steel forging temperature is too high and the cooling is too slow, the carbides are separated along the austenite to separate the reticulated carbides, when the final forging temperature of the steel is too low; The grain is elongated along the direction of deformation and presents a line-like arrangement. This arrangement cannot be completely eliminated during the annealing process; then the impact toughness of the bearing's fatigue strength is lowered.
(3) Non-conforming products for rework annealing: coarse pearlite which is generated by annealing overheating; it is necessary to pass normalizing; then the second annealing is performed.
2. The normalizing process normalizing process is mainly to select the heating temperature and cooling method; it depends on the intention of normalizing, the shape of the carbide in the fiber arrangement before the normalizing, and the shape and wall thickness of the ferrule. The normalizing heat preservation time is usually 30 to 50 minutes. The cooling rate should not be less than 50 Â° C / min; avoid the separation of the carbide net. About thin-walled parts; diffuse cooling or blow-drying, for thicker parts; spray, oil-cooled or emulsion cooling; oil-cooled It is usually taken out to the outside of the part at 300 Â°C; after the oil is incinerated, it is placed in the oil again and cooled to a temperature of not lower than 250 Â°C. Immediately after normalizing, it should be tempered or firstly subjected to stress relief at 400-450 Â°C. Fire; avoid cracks. The emulsion is usually controlled at 70 ~ 100 Â° C during cooling; the circulating cooling method is selected; the workpiece is cooled to 550 ~ 650 Â° C and then taken out of air cooling.

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