How to cool the hot CNC lathe spindle bearing? -

The shaft parts of CNC lathes, especially the main shaft, are generally combined with rolling bearings and sliding bearings, and rotate at a high speed, sometimes generating high heat. How to cool the spindle bearing of CNC lathe and make the machine run normally is a problem we need to pay attention to. If the heating condition is not cleared immediately, it will cause the bearing to overheat and overheat, and the temperature of the corresponding part of the spindle bearing of the CNC lathe will rise to cause thermal deformation. It will affect its own precision and machining accuracy, and will damage the spindle bearing of the CNC lathe. The reasons for the overheating of the spindle are mainly summarized as follows: the clearance of the spindle bearing is too small to increase the sliding friction and frictional heat; during long-term full-load turning, the rigidity of the spindle is reduced, causing bending, and the transmission system is unstable and hot. When troubleshooting this common fault, attention should be paid to: adjust the clearance of the spindle bearing of the CNC lathe to make it suitable; the supply of lubricating grease should be reasonably controlled, and the oil pipeline should be dredged; the long-term load of the CNC lathe should be minimized. Based on many years of practical experience, the key countermeasures to reduce the heat generation of bearings are: (1) Appropriately reduce the diameter of the rolling elements. Reducing the diameter of the rolling elements can weaken the centrifugal force and gyro torque, thereby reducing friction and reducing the calorific value. (2) Select new materials. For example, ceramic materials are used as rolling elements. Compared with ceramic ball bearings and steel ball angular contact ball bearings, when rotating rapidly, the rolling and rolling friction between the steel ball and the raceway is reduced, and the calorific value is reduced. (3) Choose an effective and reasonable lubrication method. Lubrication methods such as oil air and oil mist not only have a lubricating effect on the bearing, but also have a certain cooling effect. Only when the torque is accurate can the rotation be stable!

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