Machining cutter abrasion state identification method of numerical control machine tool

Abstract

The invention discloses a machining cutter abrasion state identification method of a numerical control machine tool. The method comprises a first step of data collection, a second step of regionalizing the collection data and obtaining an interval dataset, a third step of conducting wavelet packet decomposition of a collection signal and obtaining an energy percentage of each frequency range and an upper bound wavelet packet coefficient and a lower bound wavelet packet coefficient corresponding to each frequency range, a fourth step of obtaining a multiple observation sequence, a fifth step of obtaining a general hidden Markov original model lambada=(A, B, pi), a sixth step of model training and obtaining an optimal model base lambada=(lambada 1, ..., lambada n), and a seventh step of regarding the to-be-identified cutter abrasion signal data as multiple observation input, substituting into the optimal model base and identifying the cutter abrasion state. The method solves the problem of uncertainty in data processing when the cutter abrasion state is studied in the numerical control machine tool machining through a general interval probability and identifying accuracy rate is greatly improved.

Description

technical field [0001] The invention relates to the field of engineering state identification, in particular to a tool wear state identification method during CNC machine tool cutting. Background technique [0002] In the cutting process of CNC machine tools, the cutting tool is the direct executor of the metal cutting process. Under the condition of high temperature and high pressure, it is subject to the severe friction of the workpiece and chips, and there is inevitably a phenomenon of tool wear, which eventually leads to changes in the state of the tool. The change of tool state will directly lead to the increase of cutting force, the increase of cutting temperature, the increase of workpiece surface roughness, the out-of-tolerance of workpiece size, the change of cutting color and the generation of cutting vibration, and even affect the normal operation of the entire CNC machining system, resulting in unfavorable estimated loss. Therefore, the timely identification and...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method that can better deal with the uncertainty of the cutting process of CNC machine tools and solve the problem that the recognition accuracy of the tool wear state is not high due to the existence of the uncertainty problem in the existing cutting process. The method of identifying the wear state improves the accuracy of tool wear state identification

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