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.

Inactive Publication Date: 2011-12-21
HUAZHONG UNIV OF SCI & TECH +1
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  • Abstract
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  • Application Information

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Problems solved by technology

The method based on the vibration acceleration signal and the vibration displacement signal is inconvenient to monitor the signal, troublesome to install the sensor, affect the normal processing of the machine tool, and even need to change the structure of the machine tool, so it can only be used in scientific research, and it is applicable to actual production. greater difficulty

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  • An online monitoring method for turning stability of CNC machine tools
  • An online monitoring method for turning stability of CNC machine tools
  • An online monitoring method for turning stability of CNC machine tools

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Embodiment Construction

[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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Abstract

The invention provides a monitoring method for the turning stability of a digital control machine tool, relating to the monitoring technical field. As the performance of a servo system is continuously improved, a response speed, the sensibility and the like of the servo system are also continuously improved, thus, states of the machine tool can be reflected on a current of a driving motor during a cutting process. In the invention, through various signal processing methods, a plurality of characteristic values of current signals are extracted, a characteristic status vector is established as an input of a mathematical model, and a cutting status of the machine tool is output through analysis and calculation of the mathematical model. As the invention has the characteristics that the current signal has high anti-interference performance and is easy to be acquired, assistant tools are fewer, and the like, compared with a plurality of existing monitoring methods, the invention has the advantages of simple and feasible operation, good monitoring effects and the like; thereby, the invention can more easily realize the online monitoring for the processing states, and can effectively guarantee the processing security and the product quality.

Description

technical field [0001] The invention belongs to the technical field of monitoring, and in particular relates to a method for monitoring the turning stability of a numerically controlled machine tool. Background technique [0002] Achieving high precision, high efficiency, intelligence and safety of CNC machine tools and improving processing stability are the current development directions of the machine tool industry, and cutting state monitoring of CNC machine tools is an important means to achieve these goals. Through state monitoring and control optimization, CNC machine tools can ensure the quality of processed products, improve production efficiency, save costs, improve product competitiveness, ensure processing safety, and improve automation and management levels. Therefore, the development of machine tool cutting state monitoring technology is of great significance. [0003] At present, the monitoring signals commonly used in cutting state monitoring are cutting forc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23Q17/12B23Q5/54
Inventor 刘红奇李斌陈青海毛新勇彭芳瑜唐小琦毛宽民贺松平
Owner HUAZHONG UNIV OF SCI & TECH
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