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Precision evaluation method and service life prediction method for numerically controlled machine tool based on meta-action unit and integrated subjective-objective weight

A technology of CNC machine tools and subjective weights, applied in the field of CNC machine tools, can solve the problems of precision decline, lack of precision life and so on

Active Publication Date: 2019-09-06
CHONGQING UNIV
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Problems solved by technology

During the use of CNC machine tools, its accuracy will decline with the passage of time, but the existing research lacks a systematic and perfect research system on accuracy and accuracy life

Method used

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  • Precision evaluation method and service life prediction method for numerically controlled machine tool based on meta-action unit and integrated subjective-objective weight
  • Precision evaluation method and service life prediction method for numerically controlled machine tool based on meta-action unit and integrated subjective-objective weight
  • Precision evaluation method and service life prediction method for numerically controlled machine tool based on meta-action unit and integrated subjective-objective weight

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Embodiment Construction

[0078] The present invention is based on a meta-action unit and a method for evaluating the accuracy of CNC machine tools integrating subjective and objective weights. For the process, see figure 1 , as can be seen from the figure, it includes the following steps:

[0079] Step 1) FMA decomposition of the CNC machine tool

[0080] Use the structured decomposition method of function-motion-action to decompose the CNC machine tool layer by layer, and finally decompose the CNC machine tool to obtain several meta-action units. The meta-action units only include two types of the most basic motion units, namely the mobile unit and rotation unit; the meta-action unit is the meta-action unit only related to the error index; all the meta-action units constitute the action layer of the CNC machine tool;

[0081] Step 2) Clustering of Error Indicators

[0082] Measure the error index of the CNC machine tool in the stop state, and cluster the error index into the corresponding meta-acti...

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Abstract

The invention discloses a precision evaluation method and service life prediction method for a numerically controlled machine tool based on a meta-action unit and an integrated subjective-objective weight. According to an FMA structural decomposition method, structural decomposition is carried out on a numerically controlled machine tool, main static error indicators of the numerically controlledmachine tool are clustered to a corresponding meta-action unit, and a degradation rate of each error indicator is calculated; and with Shannon entropy and AHP methods, objective weights and subjectiveweights of the error indicators are determined, an integrated weight of the error indicators is calculated under the condition of the given relative importance of the subjective and objective weights, and a precision degradation condition and the prediction precision service life of the numerically controlled machine tool are evaluated by using the degradation rate of each error indicator. With the disclosed method, the overall accuracy of the numerically controlled machine tool can be evaluated and the precision service life of the numerically controlled machine tool can be predicted; the precision and the precision service life of the numerically controlled machine tool can be obtained; and the guidance of controlling the precision of the numerically controlled machine tool is provided.

Description

technical field [0001] The invention relates to the evaluation of the accuracy and life of a numerical control machine tool, in particular to a method for evaluating the accuracy of a numerical control machine tool and a life prediction method based on meta-action units and integrating subjective and objective weights, and belongs to the technical field of numerical control machine tools. Background technique [0002] CNC machine tools are the "working machines" in equipment manufacturing. They have the characteristics of high precision, high reliability, high speed, high efficiency, high automation, high flexibility and high complexity. They are the cornerstone to realize the modernization of manufacturing technology and equipment manufacturing. It is an important tool to ensure the development of high-tech industries. The technical level of CNC machine tools and the percentage of metal cutting machine tool output and total ownership are one of the important indicators to m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/4065
CPCG05B19/4065G05B2219/37616
Inventor 王治超张根保冉琰庾辉王宏伟金传喜朱晓杨欣陈一凡
Owner CHONGQING UNIV
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