A Ball Screw Pair Structure Based on Friction and Vibration Reduction

Abstract

The invention discloses a ball screw assembly structure based on friction damping and belongs to the technical field of vibration control of ball screw assemblies. According to the ball screw assembly structure, transverse vibration of the ball screw assembly at high-speed rotation can be effectively suppressed. A screw rod is of a hollow structure; a damping rod is arranged in the screw rod and is of a long cylindrical structure with multiple finger valves; the outer circumferential surface of the damping rod is in interference fit with the inner surface of the hollow screw rod, so that moderate pressure between every two combined surfaces is ensured; when the ball screw rotates at a high speed; the outer circumferential surface of a friction rod presses and covers the inner hollow surface of the ball screw by interference fit and a high-speed rotating centrifugal force; micro sliding friction is generated on the contacted surface of the screw rod and the friction rod by transverse vibration of the ball screw; transverse vibration energy of the ball screw is consumed by friction energy dissipation and the effect of suppressing the vibration is achieved. The friction damping structure of the ball screw assembly structure for controlling the transverse vibration, which is provided by the invention, has the characteristics of simple structure, good adaptability and strong operability.

Description

technical field [0001] The invention relates to a vibration-damping ball screw pair structure, which belongs to the field of vibration control of the ball screw pair. Background technique [0002] 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. The ball screw pair is the most widely used mechanical transmission part in the servo feed system of CNC machine tools. It is composed of a screw and a nut, which can realize the conversion of the screw rotation motion to the nut linear motion. Since the screw structure is a slender shaft, especially in large-scale CNC machine tools, the stroke of the table is long and the length-to-diameter ratio of the screw is large, resulting in a decrease in the rigidity and anti-vibration performance of the screw feed system, and the work of the screw pair is critical. The speed is limited by the transverse natural frequency and it ...

AI Technical Summary

Problems solved by technology

Scholars at home and abroad have conducted a lot of research on the lateral vibration control of the ball screw pair. Through literature search, no ball screw pair structure based on frictional vibration reduction has been found.

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