Failure analysis method for numerically-controlled machine tool

A fault analysis method and technology of CNC machine tools, which are applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., and can solve problems such as failure to consider failure correlation.

Inactive Publication Date: 2014-06-18
JILIN UNIV
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Problems solved by technology

[0004] The technical problem to be solved by the present invention overcomes the problem that the fault correlation is not considered in the fault analys...

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  • Failure analysis method for numerically-controlled machine tool
  • Failure analysis method for numerically-controlled machine tool
  • Failure analysis method for numerically-controlled machine tool

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specific Embodiment

[0129] The present invention takes a certain series of numerically controlled machine tools as an example, combines fault statistical related data, considers fault subsystem correlation, adopts DEMATEL method, applies directed graph and matrix operation to obtain fault subsystem comprehensive impact matrix and correlation degree; and integrates ISM method, The logical relationship of many factors interacting with each other is visually represented by a multi-level hierarchical structure model, and the key subsystem is obtained by integrating the correlation degree and the multi-level hierarchical structure model. In order to further determine the key failure modes of key subsystems, FMECA technology is used to conduct hazard analysis on key subsystems, so as to find out key failure modes and clarify the focus of reliability improvement. The systematic application of this method is of great significance to reliability research such as fault diagnosis and location, and system rel...

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Abstract

The invention discloses a failure analysis method for a numerically-controlled machine tool. The failure analysis method overcomes the defects that in the prior art, failure relevance is not considered in machine tool failure analysis. A DEMATEL-ISM method is integrated, related failure statistics data are combined, failure correlation between subsystems is taken into consideration, a digraph and matrix operations are applied to obtain a comprehensive influence matrix between the subsystems and relevancy, an overall influence matrix and a reachable matrix are obtained through the comprehensive influence matrix between the subsystems, and the reachable matrix is decomposed so that a multilevel hierarchical structure model can be obtained. The relevancy and the multilevel hierarchical structure model are synthesized to obtain a numerically-controlled machine tool key subsystem; possible failure modes of components of the key subsystem and influences of the failure modes on operation of a numerically-controlled machine tool are determined by means of FMECA technical analysis, a single point of failure is found, and perniciousness of the failure modes is determined according to the severe degree of the failure modes and the probability of occurrence of the failure modes.

Description

technical field [0001] The invention belongs to the technical field of numerical control machine tools, and relates to a method for analyzing a failure of a numerical control machine tool, in particular to a method for analyzing a failure of a numerical control machine tool considering the correlation of failures of the subsystems of the numerical control machine tool. Background technique [0002] With the enhancement of the complex function of the system and the improvement of the advanced nature, the structure of the system is also becoming more and more complex, and the potential hidden dangers of the failure of each subsystem of the CNC machine tool are increasing. During the normal use of CNC machine tools, the failure of each CNC machine tool subsystem will cause the failure of the entire CNC machine tool, and due to the existence of fault-related relationships, a failure of one unit or subsystem may cause failure of other parts of the system, causing domino failures. ...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 张英芝孙曙光申桂香郑锐戚晓艳龙哲
Owner JILIN UNIV
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