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A precision evaluation method and life prediction method for CNC machine tools based on meta-action units and integrated subjective and objective weights

A technology for CNC machine tools and precision evaluation, which is applied in the field of CNC machine tools and can solve the problems of lack of precision life and precision decline.

Active Publication Date: 2020-12-15
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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  • A precision evaluation method and life prediction method for CNC machine tools based on meta-action units and integrated subjective and objective weights
  • A precision evaluation method and life prediction method for CNC machine tools based on meta-action units and integrated subjective and objective weights
  • A precision evaluation method and life prediction method for CNC machine tools based on meta-action units and integrated subjective and objective weights

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Embodiment Construction

[0078] The present invention is based on the meta-action unit and the numerical control machine tool accuracy evaluation method integrating subjective and objective weights. For the process, please refer to 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] Using the structured decomposition method of function-motion-action, the whole CNC machine tool is decomposed layer by layer, and finally the whole CNC machine tool is decomposed to obtain several meta-action units. The meta-action unit only contains two basic types of motion units, namely mobile units 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 stopped state, and cluster the error index int...

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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 precision and life evaluation of a numerically controlled machine tool, in particular to a numerically controlled machine tool precision evaluation method and a lifespan prediction method based on a meta-action unit and integrating subjective and objective weights, belonging to the technical field of numerically controlled machine tools. Background technique [0002] CNC machine tools are the "machining machine" 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 of realizing 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 production and total ownership of metal cutting machine tools are one of the important indi...

Claims

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Application Information

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Patent Type & Authority Patents(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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