CNC machine tools Electric spindleThe issue of heat generation and temperature rise in homework has always been a focus of discussion. So, in practical operation, what factors can cause severe heat generation when the electric spindle rotates? What response measures should be taken?

Firstly, we need to clarify that the electric spindle has two primary heat sources: the spindle bearings and the built-in main motor. The prominent issue with the electric spindle unit is the heating of the built-in main motor. Because the main motor is the spindle bearing, if the heat dissipation problem of the main motor is not solved well, it will also affect the reliability of the machine tool operation. The primary solution is to use a circulating cooling structure, which can be divided into external circulation and internal circulation. The cooling medium can be water or oil, so that both the motor and the front and rear bearings can be adequately cooled. copyright by:www.84385453.com

The spindle bearing is the core support of the electric spindle and also one of the primary heat sources of the electric spindle. At that time, when adjusting the electric spindle, most of them used angular contact ceramic ball bearings. Because ceramic ball bearings have the following characteristics; Because the ball bearings are lightweight, have low centrifugal force, and low dynamic friction torque. 2. The thermal expansion caused by the long length is small, which stabilizes the preload force of the bearing. 3. Small elastic deformation, high demeanor, and long lifespan.

Due to the high operating speed of electric spindles, there are strict requirements for the dynamic and thermal functions of spindle bearings. Reasonable pre tightening force and outstanding and abundant smoothness are necessary conditions to ensure the normal operation of the spindle. Choose smooth oil mist, with an inlet pressure of 0.25-0.3MPa for the atomization generator. First, use No. 20 turbine oil and control the oil droplet speed at 80-100 drops/minute. Smooth oil mist, along with abundant smooth bearings, also carries away a large amount of heat. The smooth oil distribution between the front and rear bearings is a very important issue that needs to be strictly controlled. The cross-sectional area of the intake port is greater than the sum of the cross-sectional areas of the front and rear fuel injection ports, and the exhaust should be smooth. The injection angle of each fuel injection hole is at a 15 degree angle to the axis, so that the oil mist directly enters the bearing operating area.