1.Live center adopts precision matched angular contact bearing and integrate with roller bearing ,ensure high concentric precision .
2.sealing ring at the front end is dust proof and water proof,can avoid coolant influence the bearing prolong the life of the live center.
3.Mthe the residual austenite into martensite and precipitate of nano-sized carbide particles,enhance chucks hardness,toughness durability ,and reduce the residual internal stress .
4.Long time thermal aging treatment can get rid of the residual internal stress in grinding process .
