Machine tool spindle dynamic balance method, the bearing knowledge

The application and development of high speed machine tools, spindle speed increasing demands. But spindle set of parts in the manufacturing process, inevitably because of uneven material, shape asymmetry, processing and assembling error caused by gravity deviates from the center of rotation, make the machine produces vibration and vibration power, the machine noise, bearing heating, etc. With increasing speed, unbalanced vibration caused by increasingly fierce. Because of the machine tool spindle component rotation during deformation is small, in order to simplify the calculation, therefore, regard it as a rigid rotor balancing method to deal with. Rotor as absolute rigid body, and assume that work, under the action of centrifugal force of rotor imbalance will not happen deformation significantly. Therefore many complex under the condition of the rigid rotor imbalance, can be simplified as unbalanced force system to deal with, can be in any selected two plane add or subtract two equivalent Ud1, and Ud2 dynamic balance force to make it balance. Rigid rotor dynamic balancing are generally low quick balance, generally choose below the first critical speed of a third. Imbalance: due to the effect of centrifugal force on the bearing vibration or movement causes the rotor mass distribution state. Residual unbalance U: stick around after balancing the imbalance. Relative imbalance e: divided by the value of the quality of the rotor imbalance, it is equal to the centrifugal force to the center of the shaft displacement. Balance degree G: is relative imbalance and specify its angular velocity. Balance processing: to make effect on the bearing and rotating speed synchronous vibration and force are within specified limits, and to adjust the rotor mass distribution of homework. Full button: is the axis of rotation and coordination with keyway components, to final assembly with the keys of the key or equivalent. Key: is with rotation of the keyway or mating part, separate into action to balance the key used when processing. The imbalance and final assembly with the key ( Buried in the axis of rotation or cooperate with parts of the keyway imbalance) Quite.