CNC metal cutting machine tools of high speed spindle performance, to a considerable extent depends on the spindle bearings and lubrication. The rolling bearing stiffness, accuracy can be made higher, strong bearing capacity and the structure is relatively simple, not only is the first choice for general cutting machine tool spindle, and also favored by high-speed cutting machine tools. From the high speed rolling bearing angular contact ball bearings best, cylindrical roller bearings, followed by tapered roller bearings worst.
Angular contact ball bearings ball (ie ball) both revolution and rotation, generates centrifugal force Fc and the gyroscopic torque Mg.
With the increase of spindle speed, the centrifugal force Fc and the gyroscopic torque Mg will dramatically increase the bearing contact stress, resulting in bearing frictions, temperature increased, the decline in accuracy, and shortened life expectancy. Therefore, to improve the speed performance of this bearing, it should find ways to inhibit the increase in the Fc and Mg. Learned from the angular contact ball bearing Fc and Mg in the formula, to reduce the density of ball material, the diameter of the ball and the ball contact angle are beneficial to reduce the Fc and Mg, so the high-speed spindle using a contact angle of 15 ° or 20 ° small ball diameter bearings. However, the ball diameter can not reduce too much, basically only 70% of the standard series of ball diameter, so as not to weaken the bearing stiffness, the more critical thing is to seek to improve the material of the ball.
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