A Method for Analyzing the Reliability Influence Degree of NC Machine Tool Subsystem

Abstract

The invention relates to a method for analyzing an influence degree on the reliability of a numerically-controlled machine tool subsystem, belongs to the technical field of numerically-controlled machine tools, and aims to make up the disadvantages in the prior art that the disturbance of fault time of other subsystems of the numerically-controlled machine tool and test censoring time influences are not considered. The method comprises the following steps: (1) reading an operation recording meter of the numerically-controlled machine tool; (2) reading fault time data of the subsystem; (3) establishing a reliability functional block diagram of a numerically-controlled machine tool system and determining a subsystem reliability relation; (4) processing the disturbance of the fault time of the other subsystems of the numerically-controlled machine tool and the test censoring time influences according to censoring data; (5) establishing a reliability model of the numerically-controlled machine tool subsystem; (6) determining the reliability model of the numerically-controlled machine tool system; (7) calculating the influence degree on the dynamic reliability of the numerically-controlled machine tool subsystem; (8) calculating the influence degree on the core reliability of the numerically-controlled machine tool subsystem. According to the method provided by the invention, the reliability model of the numerically-controlled machine tool system is fitted and compared with an empirical distribution function model and the precision is less than 5%; the actual analysis requirements can be met.

Description

technical field [0001] The invention belongs to the technical field of numerical control machine tools, and relates to a method for analyzing the reliability influence degree of a numerical control machine tool subsystem, in particular to a reliability influence degree of a numerical control machine tool subsystem considering the disturbance of failure time of other subsystems of the numerical control machine tool and the influence of test censoring time Analytical method. Background technique [0002] With the increase of composite functions and the introduction of intensive technology, the potential hidden dangers of failures of various subsystems of CNC machine tools have increased. During the normal use of the CNC machine tool, the failure of each CNC machine tool subsystem will cause the failure of the CNC machine tool, and when the CNC machine tool system fails, a component will generate a failure time of its own and truncate the time of all other components , while t...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the problem that time correlation is not considered in the reliability modeling of subsystems existing in the prior art, and to provide a method that simultaneously considers the failure time disturbance and test censoring time of other subsystems of CNC machine tools Analysis Method of Reliability Influence Degree of NC Machine Tool Subsystem

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