Method for evaluating performance reliability of numerical control equipment

Abstract

The invention provides a method for evaluating the performance reliability of numerical control equipment. The method comprises the following steps of: according to collected multiple performance parameter degradation data, fitting a performance parameter distribution type by using a least square method, and judging the fitting degree; and then, training by using a multi-element support vector regression machine to obtain an optimal non-linear regression function taking time and statistical characteristics of performance parameter distribution as input and output, namely a function of the statistical characteristics of performance parameter distribution changing with time, thereby obtaining a probability density function of performance parameters so as to obtain the reliability of the numerical control equipment. Under small sample conditions, the method provided by the invention can accurately evaluate and forecast the performance reliability of the numerical control equipment, learn the probability of the numerical control equipment of completing a required function at a certain period of time, and evaluate the influence of each performance parameter on the reliability of the numerical control equipment, thereby improving the accuracy and efficiency of reliability evaluation.

Description

technical field [0001] The invention relates to the technical field of reliability evaluation of numerical control equipment, in particular to a method for evaluating the performance reliability of numerical control equipment. Background technique [0002] The high precision and high reliability of CNC equipment are ultimately guaranteed by the performance of the equipment itself. The performance reliability of CNC equipment refers to: under normal use conditions, the performance parameters of CNC equipment meet the specified working hours. Capability required by specified permissible limits. The performance reliability of CNC equipment focuses on the maintenance of the function and technical performance of CNC equipment during use, emphasizing the quality characteristics of CNC equipment during use. [0003] NC equipment performance reliability evaluation technology is one of the necessary means to quantitatively control the reliability of NC equipment. Its main purpose is...

AI Technical Summary

Problems solved by technology

In fact, during the use of CNC equipment, due to changes in external conditions such as processing conditions, processing parameters, uneven distribution of workpiece allowance, ambient temperature and lubrication, multiple performance parameters will deteriorate to varying degrees at the same time, resulting in CNC equipment The function and technical performance cannot meet the specified requirements, and the reliability of CNC equipment decreases

Since the existing reliability evaluation technology does not consider the changes in reliability caused by changes in multiple performance parameters, it cannot evaluate and predict the reliability of each performance parameter at a certain moment, resulting in the accuracy of reliability evaluation results and The credibility is reduced, so that end users often use CNC equipment in a conservative way at the expense of performance, which greatly reduces the production efficiency and utilization rate of CNC equipment

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