Hardware knowledge: the basic requirements of machine tool spindles for rolling bearings

1. Rotation and temperature rise.

With the development of science and technology, the speed of the machine tool spindle is getting higher and higher, and the speed range is getting wider. Therefore, the requirements for the stability of the bearing at high speed are getting higher and higher. The temperature rise of the machine tool spindle bearing is the limit The important factor of bearing speed. Under normal circumstances, the correct selection of bearing type, worse grade, configuration method, clearance (preload) size, lubricant and lubrication method, etc., can improve the high-speed performance of rolling bearings to a certain extent.

2. Life and carrying capacity.

For general machine tools, the life of the spindle assembly refers to the life span of maintaining the accuracy of the spindle. Therefore, the accuracy of the bearing is required to meet the life requirements of the spindle assembly. For heavy-duty machine tools or powerful cutting machine tools, the bearing should be air-filtered first Carrying capacity.

3. Rigidity and vibration resistance.

In order to ensure the processing quality of the machine tool, the spindle system must have sufficient rigidity, otherwise there will be a large re-imaging error or even chatter. Vibration resistance refers to the ability to resist forced vibration and self-excited vibration. The spindle is built Vibration resistance depends on the rigidity and damping of the spindle and bearing. The use of preloaded rolling bearings can effectively improve the rigidity of the spindle system.

4. Noise.

In high-speed grinding machines, the noise of grinding head bearings is an important component of overall noise, so low-noise rolling bearings should be used.