Two cooling methods for high-speed electric spindle

When the high-speed electric spindle is working, the built-in motor and rolling bearing will generate a lot of heat during the rotation. Due to the compact structure of the electric spindle, the small gap, and the weak spontaneous heat dissipation effect, if the heat is not dissipated in time, it will cause electricity. Different degrees of thermal expansion are generated between the internal parts of the spindle, which will affect the stiffness and machining accuracy of the electric spindle, and will seriously affect the service life of the spindle. In this regard, Jianken will introduce two cooling methods for everyone.

For the overall cooling of the electric spindle, there are usually two methods: liquid cooling and air forced cooling.

1. Liquid cooling refers to the design of cooling water circulation inside the electric spindle, and the corresponding cooling machine is equipped outside, so that the cooling liquid circulates inside the spindle to take away the internal heat. This cooling method is simple and reliable, and the cooling effect is obvious. The disadvantage is that the cooling effect on the spindle shaft is relatively poor, and the cost of the cooling machine is relatively high.

2. Forced air cooling refers to the design of a forced convection channel between the housing of the electric spindle and the stator of the motor. The heat of the motor enters the forced convection area through heat conduction, and finally brings the heat into the air to achieve the constant temperature of the electric spindle jobs. Forced air cooling is non-polluting. If a static pressure gas bearing is used, the gas of the static pressure gas bearing can circulate inside the spindle to take away part of the heat of the motor.

It is necessary to cool and dissipate the electric spindle, especially in hot weather. If you find that the electric spindle is overheated during the application process, you must consider whether to take heat dissipation measures. Do not let the electric spindle run under overheating. This will affect the service life.