Method for estimating reliability of numerical control machine tool cutting tool based on logistic model

A CNC machine tool and reliable technology, which is applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., and can solve the problems of high price of direct method, interference processing, intermittent measurement, etc.

Inactive Publication Date: 2011-09-07
XIAN RUITE RAPID MFG ENG
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Problems solved by technology

However, the direct method has disadvantages such as high price, intermittent measurement, and interference with machining. Therefore, the indirect method, which uses vibration signals as the main research object to estimate the tool wear state, has been greatly developed.

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  • Method for estimating reliability of numerical control machine tool cutting tool based on logistic model
  • Method for estimating reliability of numerical control machine tool cutting tool based on logistic model
  • Method for estimating reliability of numerical control machine tool cutting tool based on logistic model

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Embodiment Construction

[0051] Accompanying drawing is the concrete implementation example of the present invention.

[0052] The content of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0053] A method for evaluating the reliability of CNC machine tools based on the Logistic model, comprising the following steps:

[0054] 1. Signal analysis and feature extraction: Vibration signals and corresponding wear data during turning tool processing are measured through experiments, and orthogonal wavelet basis functions are used to decompose and reconstruct the vibration signals by wavelet packets, so that the coupled multi-carrier The vibration signal is decomposed into multiple single-carrier vibration signals;

[0055] 1) Wavelet packet decomposition and reconstruction

[0056] Assume that the size space of an energy-finite signal is Through packet transformation, is binary decomposed into multiple subspaces. Its iteration formula i...

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Abstract

The invention provides a method for estimating the reliability of a numerical control machine tool cutting tool based on a logistic model. The method comprises the following steps: 1, signal analysis and characteristic extraction, in which, a vibration signal in a turning tool processing process and corresponding abrasion loss are measured through experiments, and wavelet packet decomposition andreconstruction are carried out on the vibration signal by utilizing an orthonormal wavelet basis function to ensure that coupled multi-carrier vibration signals are decomposed into a plurality of single-carrier vibration signal, and the time domain characteristic of a characteristic frequency band is calculated; related analysis is carried out on abrasion loss of the turning tool, remarkable indexes of the abrasion loss of the turning tool are extracted, and a failure threshold is determined; and 2, a logistic regression model is established by utilizing the remarkable indexes of the abrasionstate of the turning tool in the step 1, and reliability evaluation indexes and failed service life prediction are carried out on the running turning tool. By the method, the equipment operation status information is introduced to the performance evaluation and reliability analysis, so the dynamic operation characteristic of the equipment can be reflected more accurately.

Description

technical field [0001] The invention relates to the application research of reliability evaluation of mechanical equipment and prediction of remaining effective life, in particular to a reliability evaluation method of CNC machine tools based on Logistic model. Background technique [0002] Numerical control machine tools are the mainstream equipment in the contemporary machinery manufacturing industry, and people have always attached great importance to improving their design reliability, accuracy of fault diagnosis and effectiveness of troubleshooting and maintenance. Therefore, it is an important problem that must be solved to strengthen the monitoring and maintenance of CNC equipment, improve the reliability of equipment, and reduce the failure rate of CNC machine tools. [0003] As an important part of CNC equipment, the tool system's reliability will inevitably affect the processing efficiency and stability of the entire equipment system. Accurate estimation of tool l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 何正嘉訾艳阳陈雪峰李兵张周锁陈保家
Owner XIAN RUITE RAPID MFG ENG
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