In-depth analysis of lubrication and sealing of precision spindle bearings-

Lubricant is a key part of the configuration of precision spindle bearings. With different types of lubrication methods, the information on the ultimate speed ratio of the bearings is different. Lubricant is filled in time according to the design points (high-speed high-precision spindle bearing system software grease filling is generally 10%~20% of the bearing space), scientific and reasonable addition of lubricant can reduce the friction and damage of the shaft system, Increase the fatigue life of the bearing, and at the same time can discharge the comprehensive frictional heat of the bearing and have the effect of cooling the bearing system; In addition to grease, the comprehensive lubrication of precision spindle bearings also has liquid oil lubrication, welding smoke lubrication and gas lubrication. Gas lubrication It has been widely used in overseas high-speed spindle system software. Gas lubrication is fuel-efficient, zero-pollution, and can significantly improve the overall DN value of the spindle bearing, and can intelligently control the specified amount of lubricant for the system shafting. Spindle structure design, lubrication and sealing must adopt different types of methods for different conditions. If the seal is damaged, it needs to be replaced regularly. If the contact between the sealing lip and the rotating workpiece exceeds 15m/s, a non-contact sealing structure is required. Most of the fast and precise machines use a labyrinth seal, and the oil pipe groove must be designed in an appropriate position. Touching the seal will not only cause friction loss and overheating at the seal contact, but also affect the rotation accuracy of the bearing system. Only when the torque is accurate can the rotation be stable!

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