A chatter suppression method for turning with variable spindle speed 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

technical field [0001] The invention relates to the field of mechanical processing, in particular to a vibration suppression method for turning with variable spindle speed based on amplitude modulation. Background technique [0002] Turning is the most widely used machining method in machinery manufacturing, mainly used for cutting shafts, discs, sleeves and other workpieces with rotating surfaces. In order to improve the material removal rate, cutting parameters of high speed and large depth of cut are often used in CNC turning. However, if the processing parameters are not selected properly, there will be a chatter phenomenon that seriously affects the processing quality and production efficiency. Chatter is a self-excited vibration that occurs between the tool and the workpiece during the cutting process of the machine tool. Once chatter occurs, it will cause serious economic losses, including accelerated tool wear, deterioration of workpiece surface quality, damage to ...

AI Technical Summary

Problems solved by technology

At present, there are few optimization methods for SSV parameters in variable speed turning, and all of them draw multi-dimensional parameterized graphs by scanning the modulation parameter space, and select the optimal modulation parameters from the graphs to optimize SSV parameters, which has the disadvantages of low calculation accuracy and optimization. Long time is not enough

Selecting the appropriate SSV parameters is a major challenge in the promotion of the current variable spindle speed technology in chatter suppression

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