Minimum-variance self-tuning regulator in EDM drilling processes for ultra-high-aspect-ratio small holes

High speed small hole electrical discharge machining (EDM) drilling processes can easily become unstable, due to changing flushing conditions, inappropriate preset electrical parameters, and machining debris residues. Although there are already successful attempts in controlling EDM processes, cost-...

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Bibliographic Details
Published inInternational journal of advanced manufacturing technology Vol. 111; no. 11-12; pp. 3293 - 3303
Main Authors Xi, Xue-Cheng, Ye, Long, Yu, Jian-Hua, Zhao, Wan-Sheng
Format Journal Article
LanguageEnglish
Published London Springer London 01.12.2020
Springer Nature B.V
Subjects
Adaptive control
Autoregressive moving average
Autoregressive moving-average models
CAE) and Design
Computer-Aided Engineering (CAD
Drilling
EDM electrodes
Electric discharge machining
Engineering
Frequency analysis
High aspect ratio
High speed
Industrial and Production Engineering
Mechanical Engineering
Media Management
Original Article
Regression analysis
Self tuning
Surface finish
Surface properties
Tool wear
Small hole EDM
System identification
Minimum-variance self-tuning regulator
Adaptive control
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Summary:High speed small hole electrical discharge machining (EDM) drilling processes can easily become unstable, due to changing flushing conditions, inappropriate preset electrical parameters, and machining debris residues. Although there are already successful attempts in controlling EDM processes, cost-effective adaptive control of high speed small hole EDM drilling has not been reported. Process stability can contribute to the improvement of machining efficiency and surface finish. To maintain a higher process stability, a minimum-variance self-tuning regulator (MVSTR) is designed based on an auto-regressive moving average exogenous (ARMAX) model. To determine specifications of the system, the time and frequency responses are analyzed, and the validation is executed for the offline system model. A series of high aspect ratio holes drilling experiments with different electrode diameters of 0.3 mm, 1.0 mm, and 3.0 mm show that, with the use of the MVSTR control scheme, a higher machining efficiency and a lower tool wear can be achieved as compared with the original controller. Microscopic pictures of drilled holes and electrodes show better surface quality.
ISSN:0268-3768
1433-3015
DOI:10.1007/s00170-020-06285-8