Research On Lubrication Mode Of High Speed Bearing
It is important to control the temperature rise of rotating spindle of the high speed, and
the temperature rise of the spindle comes from the bearing. Reduce the bearing temperature rise
1.To reduce the friction of the bearing friction.
2.To improve the bearing heat dissipation conditions.
Commonly used spindle bearing lubrication has the following several methods:
In general, the viscosity of the bearing lubricating oil decreases as the temperature rises.
In order to avoid bearing burns, must add the right amount of lubricating oil. But the increase in
the amount of oil also increased the resistance to increase the friction, which need to increase
the driving force of the spindle. If you use a trace of grease lubrication, not only less than the
purpose of low friction, but also bring the heat of the bearing. High-speed spindle high-speed
rotation, so that accelerated deterioration of grease, reducing the service life of grease.
Grease used in low speed or heavy load conditions, the speed is best not not higher than 8000
2.Oil mist lubrication:
At present, CNC grinding machine in the high-speed grinding when the spindle bearing
lubrication mostly use oil mist lubrication, oil mist lubrication is also a small amount of
lubrication category, reducing the friction rolling and bearing temperature, improve the use of
the spindle time. Another advantange is due to the electric spindle bearing oil mist lubrication
when the internal has a certain pressure, to avoid the abrasive particles into the spindle shaft
shell lead to damage the spindle. But the oil mist lubrication there is environmental pollution
and oil control is not accurate.
3.Oil and gas lubrication
Oil and gas lubrication has the follwing characteristics:
(1) Can be a very small amount of lubricating oil continuously and steadily supply bearing.
(2) Less environmental pollution, the oil and gas lubrication of the electric spindle on the
continuous operation of the propylene box for about 2h, the measurement of air pollution in the
box about 0.03mg / m3. Pollution is less than oil mist lubrication, the reason is that oil and
gas lubrication than oil mist lubrication less oil, and lubricating oil and compressed air to
gas-luqid two-phase into the bearing.
(3) Dust or moisture and cutting fluid is difficult to enter the spindle, the compressed air
inside the spindle to maintain positive pressure.
(4) Compressed air can take away the heat generated inside the spindle, effectively prevent
the thermal deformation of the bearing.