Milling machining chatter active control system and method thereof

Abstract

The invention discloses a milling machining chatter active control system. The milling machining chatter active control system comprises a displacement detecting unit, a signal collecting unit, a central control unit, a voice coil motor driver and a voice coil motor, wherein the displacement detecting unit is used for executing sensing on workpiece displacement generated by chatter and obtaining a detected voltage signal, the signal collecting unit is used for collecting the detected voltage signal and transmitting the detected voltage signal to the central control unit, the central control unit correspondingly calculates a control voltage signal according to the received detected voltage signal, the voice coil motor driver converts the control voltage signal into a current signal, conducts power amplification, and then outputs the current signal to the voice coil motor for conducting driving, and therefore the active control process of milling machining chatter is achieved. The invention further discloses a corresponding control method. Through the milling machining chatter active control system and the control method, the chatter active control process can be executed in a mode which is quick in response, large in output force, and convenient to operate and control, the advantages of being high in precision, obvious in control effect and the like are achieved, and the milling machining chatter active control system and the control method are especially suitable for being used for the purposes of chatter control of workpieces like weak rigidity workpieces.

Description

technical field [0001] The invention belongs to the technical field of cutting processing control, and more specifically relates to a milling processing chatter active control system and a method thereof. Background technique [0002] During the milling process, due to the milling force and other uncertain loads, the process system often flutters, which affects the machining accuracy and milling efficiency. Chatter is a type of self-excited vibration, of which regenerative chatter (self-excited chatter induced by dynamic milling forces due to the effect of milling thickness variations) is the most harmful. The occurrence of chatter will reduce the amount of milling and the surface quality of the workpiece, leading to the early scrapping of processing tools and generating a lot of noise; The impact is particularly obvious. [0003] Aiming at the chatter phenomenon in the milling process, various active control technologies have been proposed in the prior art. One of the me...

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Problems solved by technology

For example, Zhang Yuanming et al. proposed a method of bonding piezoelectric ceramic actuators and thin-walled weakly rigid workpieces together to perform active chatter control (see "Milling Workpiece Chatter Avoidance Using Piezoelectric Active Damping: A Feasibility Study ", Smart Mater.Struct, 14 (6), N65-N70), this method has fast response, but it is easy to break, and the output force and displacement are small, which limits its application as a driver to a large extent; J.L.Dohner proposed a method of installing a magnetostrictive actuator on the main shaft to perform active chatter control (see "Mitigation of Chatter Instabilities in Milling by Active Structural Control", J.Sound Vibr, 2004, vol 269, pages 197-211 ), this method has fast response and large output force, but it is also easy to break and has the problem of high control cost

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