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Warianty tytułu
Application of statistical methods in the monitoring of the EDM machining with wire electrode
Konferencja
Międzynarodowa Konferencja Naukowo-Techniczna EM'12 (Electromachining) (11 ; 16-18.05.2012 ; Bydgoszcz-Pieczyska, Polska)
Języki publikacji
Abstrakty
Dla potrzeb monitorowania procesów wycinania i mikrowycinania elektroerozyjnego opracowano modele statystyczne wykorzystujące mechanizm średniej kroczącej. W przypadku wycinania średnia krocząca opisuje proces zmian wartości czasu opóźnienia wyładowań. Przy mikrowycinaniu średnia krocząca śledzi proces ewolucji wybranych trzech typów impulsów napięcia międzyelektrodowego. Przedstawione metody mogą być wykorzystane zarówno do kontroli przebiegu procesów WEDM jak i mikro-WEDM. Modele zweryfikowano w trybie off-line, wykorzystując zrejestrowane ciągi impulsów napięcia międzyelektrodowego oraz podczas obróbki, implementując go w mikroprocesorowych analizatorach procesu.
The paper presents investigations of the WEDM and micro-WEDM processes degeneration, carried out with MEDIOS-20 and the experimental micro-WEDM machine MW50 type developed in IZTW. The measuring stand consisted of the WEDM machines connected with the gap voltage pulses analysers, the data logger, the PC computer with the dedicated software for data acquisition and processing. The main tool used for prediction of the both processes degeneration was the moving average (MA) model, endowed with a parameter q, which plays a role of a smoothing parameter as well as a 'memory' window. During the WEDM machining the subject of the analysis was the delay time of discharges. In the micro-WEDM process the data input for the model was the transient numerical time series received from the gap voltage discriminating system, which separated the gap voltage pulses into three classes: idle, normal and short, according to their amplitude before discharge and the voltage drop during discharge. During the analysis it has been observed, that very often the MA for the degenerated processes decreased just before the wire braking, whereas this almost never happened for the stable one. Algorithms calculated the on-line process degradation level (WZ) were derived from the above model. The off-line verification of the presented models, performed with the registered data, showed their good reliability. The algorithm was both applied in a microprocessor controller and verified on-line during the machining.
Czasopismo
Rocznik
Tom
Strony
24--31
Opis fizyczny
Bibliogr. 14 poz.
Twórcy
Bibliografia
- [1] JENNES M., SNOYES R, DEKEYSER W., 1984, Comparison of various approaches to model of the thermal load on the EDM wire electrode, Annals of the CIRP, 33, 93-98.
- [2] OBARA H., 1992, Detection of discharges position on the wire EDM, Proceed. Int. Symp. for Electr. Mach. ISEM X, Magdeburg, 404-409.
- [3] SHODA K., KANEKO Y., NISHIMURA H., FAN M.X., 1992, Adaptive control of WEDM with On-Line Detection of Sparc Location, Proceed. Int. Symp. for Electr. Mach. ISEM X, Magdeburg, 410-416.
- [4] CABANES I., PORTILLO E., MARCOS M., SANCHES J. A., 2008, An industrial application for on-line detection of instability and wire breakage in wire EDM, Journal of Materials Processing Technology, 195, 101-109.
- [5] RAJURKAR K. P., WANG W. M., 1991, On-line monitor and control system for wire breakage in WEDM, Annals of the CIRP, 40, 219-222.
- [6] LIAO Y. S., CHU Y. S., YAN V., 1997, Study of wire breaking process and monitoring of EDM, Int. Journal of Machining Tools and Manufacturing, 37, 555-567.
- [7] NOWAKOWSKI A., SZKUTNIK Z., 2004, Using random sequences for WEDM process states discrimination, Proceedings of the VIIth International Conference on Monitoring and Automatic Supervision in Manufacturing, Zakopane, 19-21.
- [8] LIAO Y. S., YAN M. T., 1996, A self-learning fuzzy controller for wire rupture prevention in wire EDM, Int. J. of Adv. Manuf. Technol., 114/267-275.
- [9] TARNG Y. S., TSENG C.M., CHUNG L.K., 1997, A fuzzy pulse discriminating system for electrical discharge machining, Int. Journal of Machining Tools and Manufacturing, 37, 511-522.
- [10] PORTILLO E., CABANES I., MARCOS M., SANCHES J.A., 2007, Anticipation of wire breakage in WEDM based on neural networks, Proceedings of the 15th International Symposium on Electromachining. Pittsburgh, USA, 23-27, 133-138.
- [11] YAN M. T., CHIEN H.T., 2007, Monitoring and control of the microwire-EDM process, International Journal of Machine Tools & Manufacture, 47, 148-157.
- [12] YAN M. T., HUANG C.W., FANG C.C., CHANG C.X., 2004, Development of a prototype Micro-Wire-EDM machine, Journal of Materials Processing Technology, 149, 99-105.
- [13] NOWAKOWSKI A., MAJERSKI P. 2011, Statistical evaluation of the WEDM process degradation, Advances in Manufacturing Science and Technology, 35, 71-83.
- [14] BROCKWELL P. J., DAVIS R.A., 1991, Time series: theory and methods (2nd ed.), Springer-Verlag, New York.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-LOD6-0031-0014