The main purpose of bearing lubrication is to use lubricants to form an isolating lubricating oil film on the friction surface between the ring, rolling element and cage to reduce the friction and wear of the bearing, prevent sintering, and thus extend the service life of the bearing. In addition, lubricants can also prevent bearing corrosion, reduce vibration and noise, cool, and prevent the invasion of external foreign matter.

Grease lubrication

1. Grease lubrication has become the most commonly used lubrication method for bearings because it is easy to use and simple to maintain. The most commonly used grease for rolling bearings is a key-based grease with mineral oil as the base oil. This grease has good adhesion and has good lubrication in a large temperature range and speed range. The applicable temperature range is -30°C~+110°C. 2. When high-speed precision bearings are lubricated with grease, the recommended grease filling amount is 15%~20% of the free space inside the bearing. 3. Grease-lubricated bearings must be run-in at the beginning of operation. After running-in, excess grease is forced into the bearing raceway, so that the grease in the bearing is evenly distributed, and the thermal equilibrium temperature can be guaranteed to be the lowest when the bearing is working normally. 4. Grease should be replenished and replaced within a certain period of time. When replenishing grease, it should be noted that greases of different types and specifications cannot be mixed, otherwise the performance of the grease will be reduced. In addition, the original grease should be cleaned when replacing the grease.

Oil lubrication

When grease lubrication cannot meet the high performance requirements of the machine tool, oil lubrication can be used. The most commonly used oil lubrication for machine tool spindle bearings includes oil mist lubrication, oil-gas lubrication, oil spray lubrication, etc.