A vibration-damping elastic support structure for ball screw pair

Abstract

An elastic supporting structure for damping a ball screw pair belongs to the field of vibration control of ball screw pairs, and comprises a squirrel-cage elastic sleeve (1), metal rubber gaskets (2), metal rubber rings (3) and outer sleeves (4). The elastic supporting structure is connected with a nut and a nut seat of the ball screw pair. On the premise of ensuring the axial rigidity, the radial connecting rigidity between the nut and a worktable is reduced. Through the reasonable design of the radial rigidity of the elastic supporting structure, the radial inherent frequency of a screw is improved, the variable range of the radial inherent frequency of the screw, which is caused by nut movement, is reduced, the radial dynamic characteristic of the screw is improved, and the critical speed of revolution of the ball screw pair is increased. A metal rubber damping material is arranged in the elastic supporting structure, so that the radial vibration of the ball screw pair is further inhibited. The density and the rigidity of metal rubber are reasonably selected so as to optimize the vibration inhibition effect, the operation performance of the ball screw pair is improved, and the operation noise is reduced. The elastic supporting structure is applied to ball screw pairs of different types and different working conditions.

Description

technical field [0001] The invention relates to a vibration-damping elastic support structure of a ball screw pair, which belongs to the field of vibration control of the ball screw pair. Background technique [0002] The ball screw pair is the most widely used mechanical transmission component in the CNC machine tool servo feed system, and its accuracy and reliability directly affect the processing quality of the workpiece. With the development of CNC machine tools towards high speed and precision, the performance requirements for ball screw pairs are also getting higher and higher. In large-scale CNC machine tools, due to the long stroke of the worktable, the lead screw also becomes longer accordingly, resulting in a decrease in the stiffness and anti-array performance of the feed system, which affects the service life of the ball screw. [0003] The structure of the ball screw pair includes a screw and a nut. The nut is connected with the nut seat to drive the reciprocat...

AI Technical Summary

Problems solved by technology

In large-scale CNC machine tools, due to the long stroke of the worktable, the lead screw also becomes longer accordingly, resulting in a decrease in the stiffness and anti-array performance of the feed system, which affects the service life of the ball screw

[0003] The structure of the ball screw pair includes a screw and a nut. The nut is connected with the nut seat to drive the reciprocating motion of the table. The structure of the slender shaft of the ball screw pair is prone to vibration, which makes it difficult to achieve high speed.

The ball screw pair will produce bending, axial and torsional vibrations during the working process, of which the radial bending vibration is more obvious. The critical speed of the screw is difficult to increase due to the limitation of the radial natural frequency. , the dynamic performance of the ball screw pair is also constantly changing, and vibration control is difficult to achieve

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