Stiffness/damping adjustable double-cantilever beam sealed passive damper

Abstract

The invention relates to a numerical control machine tool and workpiece passive vibration damping device which can be applied to the field of machining and has the obvious single-degree-of-freedom vibration characteristic. The device comprises a shell, a base, cantilever beams, a mass block, a screw, a nut, a gasket, a friction plate, a threaded hole and the like and is of a box-like sealed structure. The device is characterized in that main mode motion which is strictly vertical to the direction of the cantilever beams is realized, and the vibration characteristic is derived from first-order bending vibration of the two cantilever beams. The stiffness and damping of the device are adjustable, and the adjustment can be realized by adjusting the position of the mass block in the device and the pretightening force of the friction plate, thereby having a wider vibration suppression frequency range. The device is suitable for the characteristics that the dynamic property of a workpiece or a machine tool changes during the machining and a damper is required to be capable of adjusting parameters. The device can be mounted on a numerical control lathe, a milling machine or the workpiece for vibration damping. The device is simple in structure, convenient to implement and lower in cost, has no environmental pollution, and can be used for effectively reducing the vibration during cutting machining and realizing high-efficient and high-quality machining of parts.

Description

technical field [0001] The invention discloses a double cantilever beam sealed passive damper with adjustable stiffness / damping, and specifically relates to a machine tool and workpiece vibration damping device in the metal numerical control cutting process, so as to realize efficient and high-quality processing of metal parts. The utility model relates to a vibration damping device belonging to the field of mechanical processing. Background technique [0002] In the cutting process of CNC machine tools, strong vibrations often occur between the tool and the workpiece, which not only reduces the surface quality of the workpiece, but also affects the service life of the tool and the machine tool; at the same time, the vibration is accompanied by a lot of noise. According to the different forces, the vibration on the machine tool can be divided into free vibration, forced vibration caused by external excitation and self-excited vibration caused by the cutting process itself (i...

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of passive dampers is that the vibration suppression frequency band is relatively narrow; the premise of its vibration suppression effect is that its stiffness and damping parameters must have a more accurate matching relationship with the dynamic parameters of the suppressed target mode

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