Breakage monitoring method for milling tool

Abstract

The invention discloses a breakage monitoring method for a milling tool, belonging to the field of monitoring of tool conditions. The breakage monitoring method comprises the following steps: S1, the three-phase currents of a spindle motor are selected as monitoring signals; the root-mean-square values of the monitoring signals are calculated and are subjected to slippage smoothness process to obtain smooth root-mean-square values which are taken as characteristic values for monitoring breakage of the milling tool; S2, a complete milling cycle is divided into three processes of cutting-in, stable cutting and cutting-out; then the processes of cutting-in, stable cutting and cutting-out are subdivided into multiple small sections with identical time spans; S3, the threshold values of each small section are jointly determined by the characteristic values of the last small section and threshold value coefficients; the threshold value coefficients are obtained by studying milling cycle data of multiple groups of tools under the condition that the tools are not broken; and S4, finally, the breakage of the tool is identified by comparing the threshold values of each small section with the characteristic values. The breakage monitoring method is not affected by change of cutting parameters; and the threshold value coefficients are study results based on a large amount of data, so that very high reliability is provided.

Description

technical field [0001] The invention belongs to the field of monitoring the state of a milling tool, in particular to a method for monitoring the damage of a milling tool. Background technique [0002] With the continuous development of modern production and manufacturing technology, CNC machine tools are widely used in the processing and manufacturing of various workpieces. In order to improve processing efficiency and ensure processing safety, online monitoring of tool status is required. Timely identification of tool damage can help protect machine tools and workpieces, increasing productivity. [0003] Since 1980, domestic and foreign scholars have done a lot of research work on the on-line monitoring of tool damage. The traditional tool damage state monitoring method is: monitor the processing signal during the machining process of the machine tool, extract the characteristic value that can reflect the change of the tool state from the monitored processing signal, set ...

AI Technical Summary

Problems solved by technology

This will cause the time of each processing cycle to be not fixed, and the amplitude of the monitoring signal will also change greatly

Therefore, the traditional tool damage monitoring method based on the fixed threshold method is not accurate enough, the applicable range is narrow, and the applicable conditions are harsh

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