Rings of cold treatment

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The quenching was allowed to cool to room temperature, placed immediately below room environment for a certain time, remove placed in a room temperature, this is lower than the room temperature processing called cold processing. Bearing steel cold treatment is often used freezers and dry ice a lcohol solution.spherical roller bearing
The role of cold treatment
Precision bearings, high dimensional stability requirements; After the ferrule quenching (especially Martempering the the), the internal organization retains more residual austenite, this residual austenite is unstable organization, storage and use bearing process, will continue to change, thus changing the precision of the bearing. Used for this purpose of the cryogenic treatment process, it can reduce the tissue of the residual austenite, and slightly increase the hardness of the parts.
2 cold process
After quenching stay at room temperature,: quenched make sure that rings inside and outside the uniform cooling to room temperature after cold treatment, or easy to crack, cool to room temperature immediately after cold treatment (usually no more than 30min), otherwise it will abort the austenite to martensite transformati on.ball roller bearing
Cold treatment temperature: the temperature of the cold treatment to terminate the steel martensitic transformation temperature Mf Also consider cold treatment on the mechanical properties and manufacturability factors.
GCr15 steel optional -70 ° C cold treatment; the ferrule or equipment accuracy requirements are not very high limit, the cold treatment temperature optional -40 to -70 ° C; super-precision bearings, in -70 ℃ ~ -80 ℃ between the cold treatment. Too cold temperature impact fatigue affect the bearing and contact life.
Cold processing insulation: Although a large number of martensitic transformation in cold Immediately the completion to a certain temperature, but the Ministry of the surface of the heart are evenly reach the temperature of the cold treatment, the need for a certain holding time, usually 1 to 1.5 for the number of rings h.
Co ld treatment after tempering: ferrule cold treatment on the air, its temperature was allowed to warm slowly to room temperature after tempering in a timely manner. Temperature rise can not be too fast, or easy to crack; tempering timely, otherwise ferrule internal residual stress will cause the ferrule cracking, generally no more than 2h.roller bearing manufacturers