Technical introduction of high speed spindle bearings for machine tools

Technical introduction of high-speed spindle bearings for machine tools (machine tool bearings):

    Increasing the speed of the spindle bearings is the key to achieving a high-speed, practical spindle. With the development of high speed, it is efficient for machining machine tools. The rolling element is made of ceramic material, the dmN value is about 20×104, and the numerical control machining center with dmN value of 100×104 under grease lubrication condition is increasing day by day. It has become a development trend, and the oil and oil mist lubrication method will become the future. The development direction of high-speed machine tool spindle bearing lubrication.

    1 high-speed spindle bearing development:

    Generally, angular contact ball bearings with excellent rigidity and high speed performance are used, in order to meet the high speed requirements of the machine tool spindle. Secondly, cylindrical roller bearings are used.

    The dmN value under grease lubrication conditions is 50×104 or less. After the development of oil and gas lubrication, at the same time, gradually develop a compatible lubrication system. From the dmN value of the high-speed performance of the spindle bearing (dm is the diameter of the bearing pitch circle mm × N is the speed r / min. The dmN value has reached 100 × 104 or more. Later, in the bearing, the angle of the rolling element is ceramic Contact ball bearings, after the dmN value of 200 × 104 × 90 years developed spray lubrication, dmN value can reach 300 × 104.

    2 high speed spindle bearing technology:

    (1) High-speed angular contact ball bearings:

    Single row and double row cylindrical roller bearings are inferior to angular contact ball bearings in terms of high speed performance. Angular contact bearings are bearings with contact angles, and tapered roller bearings can be seen. The larger the contact angle, the better the axial stiffness, but since the gyro sliding and the spin sliding between the ball and the raceway are also large, the heat is also increased. In order to improve the speed performance, the method is to reduce the size (or mass) of the ball to change the curvature coefficient of the channel, to reduce the centrifugal force of the ball, reduce the internal load generated during high-speed operation, and increase the number of balls to increase the rigidity.

For more information and purchase please visit: https://www.supplyforever.com

Some knowledge of bearing heating failure

      Bearing consultation to form a knowledge of bearing heating failure
      The bearing is a fixed part of the machine and is the main body of the machine. Its function is basically to maintain the center position of the shaft and the mechanism for controlling the movement. Bearings play a decisive role in any machine. If there are no imported bearings, the machine will not work.
      Many users have reported that when using bearings, the failure of bearing heating is the most common, and this failure will also affect the life and performance of the bearing. So how is this failure formed? Below, is the knowledge that is summarized for everyone.
      1. The oil level is too low and the lubricant is lost from the oil seal;
      2. The grease in the bearing housing is completely filled or the oil level is too high. This can lead to excessive lubrication, high temperature or oil leakage;
      3. The contact type (friction) oil seal is too dry or the spring is too tight;
      4. The inner hole of the bearing box is not round; the bearing box is twisted and deformed; the bearing surface is not flat; the inner diameter of the box hole is too small;
      5. The contact type (friction) oil seal is too dry or the spring is too tight.

For more information and purchase please visit: https://www.supplyforever.com