Bent actuator-based thin-walled workpiece machining vibration suppressing device and method

Abstract

The invention discloses a bent actuator-based thin-walled workpiece machining vibration suppressing device. The vibration suppressing device comprises a vibration detection unit, a signal acquisitionunit, a power amplification unit, a control computer, a programmable signal generator and a bent actuator; the bent actuator is used for applying a reverse vibration suppressing force to a thin-walledworkpiece to perform active control over regenerative chatter vibration in a milling process. The invention further discloses an active vibration control method aiming at the vibration suppressing device. The vibration suppressing device disclosed by the invention is capable of realizing real-time detection and feedback control on the vibration of the thin-walled workpiece in the milling processby relatively high precision, is fast in response speed, has a big and accurate output force, also has the advantages of being small in size, low in power consumption, high unit volume strain energy,and the like, and can adapt to the narrow machining space of a thin-walled workpiece complicated in shape and the complexity and the time variation of the dynamic characteristic of a tool-workpiece system in the machining process of the thin-walled workpiece complicated in shape.

Description

technical field [0001] The invention belongs to the field of machining, and in particular relates to a vibration suppression device and method for machining thin-walled parts based on a bending actuator. Background technique [0002] Thin-walled parts have the advantages of light weight and high specific strength, and have been widely used in many fields such as aerospace, automobiles, and energy. Particularly in aerospace, reducing structural mass will reduce energy consumption and improve overall vehicle performance. Therefore, it is of great significance to design and manufacture high-quality thin-walled parts that meet performance requirements. Typical aviation thin-walled components mainly include integral blisks, assembled blisks, casings, wing ribs, flap slide rails, girders, wall panels, etc. [0003] Thin-walled parts are weakly rigid parts. The main difficulty in processing is that vibration is easily generated under the action of cutting force, especially under ...

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Problems solved by technology

For example, Li Xiaohu et al. (refer to the patent "Milling Electric Spindle Vibration Suppression System and Method Based on Predictive-Adaptive Control-201810092078.9") use an electromagnetic actuator to actively control the vibration of the milling spindle. This method has a large output force and displacement. , but the control accuracy is not high, it is difficult to adapt to the high-precision requirements of aviation parts; Practice,1996,4(12):1647~1658"), this active control method has fast response speed, large displacement and force, brittle materials are easy to break, and can only bear force in one direction

[0005] Chen Puwei and others used a voice coil motor to actively control chatter in the milling of aerospace thin-walled parts (see "Research on Active Vibration Control of Thin-walled Workpiece in Milling Based on Voice Coil Motor"). This control method has fast response speed and high precision. Reliability is strong, but the actuator is large in size and poor in flexibility. It is difficult to adapt to the narrow processing space of complex core aviation thin-walled parts (such as turbine blisks and impellers), and it is difficult to apply it in actual production.

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