Three-degree-of-freedom low-frequency vibration absorption device of main shaft

Abstract

The invention discloses a three-degree-of-freedom low-frequency vibration absorption device of a main shaft. The three-degree-of-freedom low-frequency vibration absorption device comprises a vibration absorption device main body, a first acoustic black hole and a second acoustic black hole, the first acoustic black hole is parallel to the axial direction of the main shaft, the second acoustic black hole is perpendicular to the axial direction of the main shaft, the first acoustic black hole and the second acoustic black hole are both in a circular ring shape, the first acoustic black hole and the second acoustic black hole take the axis of the main shaft as a symmetry axis, the vibration absorption device main body comprises a circular ring structure, the first acoustic black hole is a cavity formed in the inner surface of the circular ring structure, the distance between the inner surface and the outer surface of the circular ring structure is gradually reduced and changed from the central axis of the circular ring structure to the outer edge, and the circular ring structure comprises the first acoustic black hole. The three-degree-of-freedom low-frequency vibration absorption device of the main shaft is reasonable in structure, has better energy gathering efficiency and wider vibration absorption frequency band, effectively realizes low-frequency vibration absorption and is high in practicability.

Description

technical field [0001] The invention belongs to the technical field of main shaft shock absorption, and in particular relates to a three-degree-of-freedom low-frequency vibration-absorbing device for a main shaft. Background technique [0002] When the machine tool is running at high speed, due to factors such as external excitation, uneven surface of the machined workpiece, aging of machine parts, loose support and other factors, various vibrations will always be brought about, and these vibrations will be accompanied by many The emergence of unnecessary hazards. For example, in the process of turning and milling, excessive vibration of the machine tool spindle will reduce the machining accuracy and surface smoothness of the workpiece, which will intensify the wear and fatigue damage of the tool, which will not only shorten the life of the tool, but even lead to dangerous accidents. Long-term severe vibration will lead to the loss of normal functions of the machine tool, r...

AI Technical Summary

Problems solved by technology

The cutoff frequency is often affected by the size of the ABH, and the low-frequency black hole effect is difficult to achieve in applications where the size of the ABH is limited

When multiple acoustic black hole structures are periodically distributed into the structure, in the lower frequency range below the acoustic black hole cut-off frequency, there is still a good vibration and noise reduction effect, but limited by the installation space and the main shaft structure, it can be installed The acoustic black hole structure of the finite

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