Pipe cutting technology plays an important role in the process of offshore platforms decommissioning, as many devices such as tubing, drill pipe, and casing need to be decommissioned. In this study, a novel cutting pipe technology based on electro-discharge machining (EDM) is proposed, and a cutting pipe mechanism is developed to cut the pipes for decommissioning offshore platforms. The machining principles and characteristics of the technique are described. The effects of machining parameters, including tool polarity, dielectric fluid, electrode material and width, pulse on-time, pulse off-time, peak voltage, and electrode rotation speed to machining performance, are investigated. The material removal rate (MRR) of the machined casing and tool electrode wear ratio (EWR) is obtained based on the calculation of the percentage of mass loss per machining time. The experimental results show that a better cutting performance can be obtained with negative tool polarity at the conditions of dielectric fluid of emulsion, pulse on-time of 500 µs, pulse off-time of 200 µs, peak voltage of 70 V, copper electrode width of 28 mm, and electrode rotation speed of 250 rpm is a better choice. Additionally, the cutting slots surface has been investigated by the means of scanning electrode microscopy (SEM). The cutting slots machined by the rotary EDM are clean and smooth.
Characteristic investigation of pipe cutting technology based on electro-discharge machining
Untersuchung der Eigenschaften einer Rohrschneidtechnologie auf der Basis der elektroerosiven Bearbeitung
International Journal of Advanced Manufacturing Technology ; 66 , 9-12 ; 1673-1683
2013
11 Seiten, 14 Bilder, 1 Tabelle, 21 Quellen
Aufsatz (Zeitschrift)
Englisch
Off-Shore-Anlage , Stilllegung , Demontage , Rohr , Rohrleitung , Bohrgestänge , Mantelrohr (Rohrleitung) , elektroerosives Schneiden , Prozessentwicklung , Verfahrenseignung , Verfahrensparameter , Polarität , dielektrischer Stoff , Elektrodenwerkstoff , Elektrodenform , Leistungsfähigkeit , Werkzeugverschleiß , experimentelle Untersuchung , Parameteroptimierung , Drehzahl , Schneidspalt , Schnittqualität
Taylor & Francis Verlag | 2018
|Vibration of wires used in electro-discharge machining
Online Contents | 2003
|Effect of Cryogenic Treatment of Copper Electrode on Electro-Discharge Machining
SAE Technical Papers | 2017
|Investigation on the cutting mechanism when machining free cutting steels
Kraftfahrwesen | 1994
|