Reliability evaluation method of numerical machine tools based on competitive failure
A technology of numerical control machine tools and competition failure, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of reliability modeling deviation and difficulty in fully exerting the role of reliability work, etc.
Inactive Publication Date: 2018-12-21
JILIN TEACHERS INST OF ENG & TECH
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The reliability modeling of traditional CNC machine tool systems mostly ignores the difference in failure modes, and classifies them into one category without distinction for statistical analysis of a single failure mode. Due to the neglect of mode differences and the competitiveness of modes, there are deviations in reliability modeling. It is difficult to give full play to the role of reliability work
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[0035] For the research on the reliability of CNC machine tools, it is mainly to consider the competition relationship between the two failure modes of sudden failure and degeneration failure to establish the competition failure model and estimate the parameters. However, when modeling a single failure mode, there is a deviation in the model due to ignoring the time correlation between modes, which affects the rationality of the final system model and evaluation results. Therefore the present invention divides the mechanical wear failure of numerical control machine tool system into degeneration failure mode, divides electronic device failure into sudden failure mode; The order of the degradation failure modes is corrected by the average rank method, and the reliability model parameters are estimated and the fit test is carried out accordingly to determine the reliability model of the failure mode; otherwise, when focusing on the sudden failure mode, the The data of degenerate...
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The invention relates to a reliability evaluation method of a numerical control machine tool based on competitive failure. The method divides mechanical wear failure and electronic device failure of the numerical control machine tool system into degradation failure mode and sudden failure mode respectively. When the degradation failure mode is focused on, the failure mode data are processed according to the truncated data, and then the order of degradation failure mode is modified by using the average rank method, and the reliability model of failure mode is determined accordingly. On the other hand, when focusing on the failure mode of sudden failure, the data of degraded failure mode is processed according to the truncated data, and then the order of the failure mode of sudden failure ismodified by using the average rank method, and the reliability model of the failure mode is determined accordingly. Finally, considering the failure mode competition, a system reliability evaluationmodel based on competitive failure is established. The invention is more reasonable to evaluate the reliability of the numerical control machine tool, and is more in line with the reality.
Description
Technical field: [0001] The invention relates to a method for evaluating the reliability of a numerically controlled machine tool, which belongs to the technical field of reliability research of a numerically controlled machine tool. Background technique: [0002] Numerical control machine tool is a complex system integrating machine, electricity, hydraulic and other technologies. The complexity of the system component structure and the harshness of the environment lead to the diversity of its failure modes. The operation failure of CNC machine tools is usually the result of the competition of multiple failure modes, which we call competition failure. The reliability modeling of traditional CNC machine tool systems mostly ignores the differences in failure modes, and classifies them indiscriminately into one category for statistical analysis of a single failure mode. Due to ignoring the differences in modes and the competitiveness of modes, there are deviations in reliabilit...
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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 李研
Owner JILIN TEACHERS INST OF ENG & TECH