The CNC machined spindle part is an important component in the mechanical part of the CNC machine tool, which is mainly composed of the spindle, the bearing, the spindle accurate stop device, the automatic clamping and the chip removal device. The lubrication, cooling and sealing of the spindle components of CNC machine tools are several issues worthy of attention during the use and maintenance of machine tools.
First, the good lubrication effect can reduce the working temperature of the bearing and prolong the service life; for this reason, it should be noted in the operation and use: at low speed, use grease and oil circulating lubrication; at high speed, use oil mist and oil-air lubrication. .
However, when grease lubrication is used, the sealing amount of the main shaft bearing is usually 10% of the bearing space volume. Do not fill it up at will, because too much grease will aggravate the heating of the main shaft. For oil circulation lubrication, check the spindle lubricating constant temperature oil tank every day during operation and use to see if the oil amount is sufficient. If the oil amount is not enough, add lubricating oil in time; at the same time, pay attention to check whether the temperature range of the lubricating oil is appropriate.
In CNC machining, in order to ensure good lubrication of the spindle, reduce friction and heat, and at the same time take away the heat of the spindle assembly, a circulating lubrication system is usually used, a hydraulic pump is used to supply oil for lubrication, and an oil temperature controller is used to control the oil temperature of the oil tank. . The spindle bearings of high-end CNC machine tools are lubricated by high-grade grease sealing method, and each grease can be used for 7 to 10 years.
The new lubrication and cooling method of CNC machining not only reduces the temperature rise of the bearing, but also reduces the temperature difference between the inner and outer rings of the bearing to ensure that the thermal deformation of the spindle is small.