Variable-mainshaft-speed turning chatter suppression method based on amplitude modulation

Abstract

The invention discloses a variable-mainshaft-speed turning chatter suppression method based on amplitude modulation. The method comprises the following steps that a modal force hammer is used for carrying out hammering modal testing on a turning tool so as to obtain a turning tool nose displacement frequency response function of the turning tool under stimulation of the modal force hammer; main modal parameters are recognized by analyzing the tool nose displacement frequency response function of the turning tool; cutting force coefficient testing is carried out on a workpiece so as to obtain cutting force coefficients; a variable-mainshaft-speed turning kinetic equation of amplitude modulation is set up; mode changes of the mainshaft speed according to amplitude modulation are shown as a speed fluctuation function; and an objective function is selected for optimizing the speed fluctuation function, and therefore a turning stability lobe diagram is obtained. By means of the method, thedifficulty of selecting the amplitude and frequency in a conventional sine variable-mainshaft-speed method can be avoided, and the turning chatter suppression phenomenon is simply and effectively suppressed by adopting a novel variable-mainshaft-speed mode.

Description

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AI Technical Summary

Benefits of technology

This patented technology uses an alternative way called phase-modulated variables for controlling how fast things are turned when they're being worked (the process). It improves upon traditional methods that use sinus waves instead of pulse signals because these waveforms have more precise timing compared to other forms like pulses. Additionally, this technique allows for faster machine tool movements without causing excessive vibrations due to changes made over time. Overall, this innovation helps improve precision and efficiency in milling processes while reducing difficulties associated therewith.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the performance and productivity of milling machines when working at different speeds depending upon their needs. It suggests various ways to reduce chirping noise caused by periodic changes made over rotation due to factors like temperature variations and load weight distribution. One approach involves adjustable settings called SSV values, but these may have poor calculations and optimum selection processes require long periods before they become effective. Another solution proposes a new way of controlling power supply without sacrificially reducing the effectiveness of the turning operation while also considering how best to choose suitable wave frequencies and amplitudes for efficient chipping reduction.

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