A three-degree-of-freedom low-frequency vibration-absorbing device for a spindle

Abstract

The invention discloses a three-degree-of-freedom low-frequency vibration-absorbing device for a main shaft, which includes a main body of the vibration-absorbing device, 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, and the second acoustic black hole The black hole is perpendicular to the axial direction of the main axis, the first acoustic black hole and the second acoustic black hole are circular, and the first acoustic black hole and the second acoustic black hole take the axis of the main axis as the axis of symmetry, and the vibration-absorbing The main body of the device includes a ring-shaped structure, the first acoustic black hole is a cavity formed by the inner surface of the ring-shaped structure, and the distance between the inner and outer surfaces of the ring-shaped structure is determined from the center of the ring-shaped structure The axis gradually decreases towards the outer edge. The circular structure includes the first acoustic black hole. The three-degree-of-freedom low-frequency vibration-absorbing device of the main axis has a reasonable structure, better energy gathering efficiency and a wider vibration-absorbing frequency band, and is effective Realize low-frequency vibration absorption, practicality is strong.

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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