Method for modeling and evaluating reliability of three types of functional components of numerical control machine tool

Abstract

The invention relates to a method for modeling and evaluating reliability of three types of functional components of a numerical control machine tool. The method comprises the following steps: drawing a WPP (Wax Polypropylene) diagram of the fault interval time according to the reliability on-site test data of the numerical control machine tool; if the WPP diagram trends to one straight line, carrying out two-parameter Weibull distribution modeling on the service lives of the functional components and evaluating the reliability of the functional components; if the WPP diagram has an obvious inflection point, adopting the double Weibull mixing distribution modeling and estimating the parameters of the WPP diagram; and carrying out the reliability evaluation on the double Weibull mixing distribution model. By utilizing the method, the reliability modeling and evaluation on the functional component is carried out based on the reliability data on-site test data of the three types functional components of the numerical control machine tool in operation state, the fault distribution regulation in the service life period process of the functional component products is revealed by adopting multiple Weibull distribution models, and furthermore the comprehensive parameter estimation is carried out, so that the reliability modeling and evaluation problem of complex systems such as the functional components is better solved.

Description

technical field [0001] The invention belongs to the field of reliability engineering of key functional components of numerical control machine tools, and relates to a method for reliability modeling and reliability evaluation of three key functional components such as a high-speed spindle unit, a tool magazine, a manipulator, and a power servo tool rest. Background technique [0002] The reliability of the functional components of CNC machine tools has an important impact on the reliability of the whole machine, especially the high-speed spindle unit, tool magazine and manipulator, and power servo tool holders have a particularly obvious impact on the reliability of the host machine, which is a weak link in the reliability of domestic CNC machine tools , is a key component that affects the reliability level of the whole machine. The science and technology novelty search shows that although there have been reports on the reliability of the functional components of CNC lathes ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for reliability modeling and evaluation of functional components based on the reliability field test data of functional components such as CNC machine tool power servo tool holders, tool magazines, manipulators, and high-speed spindle units in the operating state. Reliability modeling and reliability evaluat

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