Open AccessTime-varying reliability modelling and quasi-static accuracy optimization of precision CNC machine tools
Author(s) -
Siu-Siu Guo,
Bo Pang,
Gangjun Jiang,
Hongxia Chen,
Zhiqiang Li
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1654/1/012022
Subject(s) - reliability (semiconductor) , machine tool , computer science , compensation (psychology) , numerical control , moment (physics) , function (biology) , machining , reliability engineering , limit (mathematics) , engineering , mathematics , mechanical engineering , psychology , mathematical analysis , power (physics) , physics , classical mechanics , quantum mechanics , evolutionary biology , psychoanalysis , biology
Aiming at the influence of time-varying characteristics of geometric error on precision CNC machine tool quasi accuracy retention, a time-varying reliability accuracy maintenance method based on multi-objective reliability and maintenance cost tradeoff is proposed. Firstly, on the basis of geometric error transfer model and Achard adhesive wear theory, a quasi-static accuracy reliability limit state function to meet time-varying characteristics is established and the time-varying accuracy reliability is solved based on the First order second moment method. Secondly, according to the time-varying characteristics of the quasi-static accuracy of machine tools, the maintenance cost model and reliability multi-objective optimization model are established, and the trade-off between cost and reliability function is realized. Finally, the optimization results of three-axis machining center show that the method can realize the optimization of geometric accuracy and determine the quasi-static error compensation value which meets the requirements of reliability accuracy.