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Fault Phenomenon: When the spindle rotates at high speed, the heat is serious.



Analysis and treatment process: The heating and temperature rise in the operation of motorized spindle has always been the focus of research. There are two main heat sources inside the motorized spindle unit: one is the spindle bearing, the other is the built-in main motor.



The heating of the built-in main motor is the most prominent problem of the motorized spindle unit. Because the main motor is next to the spindle bearing, if the heat dissipation problem of the main motor is not solved properly, it will also affect the reliability of the machine tool. The main solution is to adopt circulating cooling structure, which includes external and internal circulation. The cooling medium can be water or oil, so that the motor and the front and rear bearings can be fully cooled.



Spindle bearing is the core support of motorized spindle and one of the main heat sources of motorized spindle. At present, angular contact ceramic ball bearings are mostly used in high-speed motorized spindles. Ceramic ball bearings have the following characteristics:

The ball has light weight, small centrifugal force and small dynamic friction moment.

(2) The thermal expansion caused by temperature rise is small, which makes the pre-tightening force of the bearing stable.

(3) Small elastic deformation, high stiffness and long service life.



Because of the high speed of the motorized spindle, there are strict requirements for the dynamic and thermal performance of the spindle bearing. Reasonable preload and good and sufficient lubrication are the necessary conditions to ensure the normal operation of the spindle. Oil mist lubrication is used. The inlet pressure of the atomizer is 0.25~0.3 MPa, and 20 # turbine oil is selected. The droplet velocity is controlled at 80~100 drops/min. Lubricating oil mist not only fully lubricates bearings, but also takes away a lot of heat. Therefore, the high-speed spindle maintenance manufacturer suggests that the lubricant distribution of front and rear bearings is very important and must be strictly controlled. The intake cross section is larger than the sum of the front and rear injection cross sections. The exhaust should be smooth. The injection angle of each injection orifice is 15O angle with the axis, so that the oil mist can be directly injected into the bearing working area.