An online monitoring method for turning stability of CNC machine tools
A numerical control machine tool and stability technology, applied in the monitoring field, can solve the problems of inconvenient signal monitoring, affecting the normal processing of the machine tool, and troublesome sensor installation.
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[0021] The on-line monitoring method of turning stability of the present invention realizes on-line monitoring of turning stability by acquiring the current signal of the drive motor of the machine tool, going through a series of signal processing and feature extraction selection processes, and finally through the judgment process of the monitoring model.
[0022] The method of the invention utilizes the CDHMM model and the model library to analyze and calculate the collected data to realize the turning stability monitoring of the numerical control machine tool. First, initialize the parameters of the CDHMM model and generate the model library through the following steps. The process is as follows: figure 1 shown.
[0023] (1) Use the Hall current sensor to measure the three-phase output current of the drive motor of the CNC machine tool respectively, as a sample current signal;
[0024] The sample current signal obtained through step (1) should include three cutting states: ...
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