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Removal characteristic of stainless steel in pulsed electrochemical machining

Auflösungscharakteristik von Edelstahl beim elektrochemischen Präzisionsabtragen
: Meichsner, Gunnar; Hackert-Oschätzchen, Matthias; Petzold, Tom; Krönert, Maik; Edelmann, Jan; Schubert, Andreas; Putz, Matthias

Deconinck, Johan (Ed.):
12th International Symposium on Electrochemical Machining Technology, INSECT 2016. Proceedings : Freie Universität Brüssel, Brüssel, 17.-18. November 2016
Brüssel, 2016
ISBN: 978-9-4619746-1-7
International Symposium on Electrochemical Machining Technology (INSECT) <12, 2016, Brüssel>
Conference Paper
Fraunhofer IWU ()
ECM; PECM; electrochemical machining; removal characteristic

Electrochemical machining (ECM) of metallic materials is a complex manufacturing process. The removal of a material mainly depends on the material itself, its heat treatment, the used electrolyte and the energization of the process. [1,2,3]For designing the ECM process and the cathode geometry it is necessary to know the resulting removal behaviour of the material [3,4,5]. In addition to the resulting removal behaviour the focus for industrial applications is on the achievable machined surfaces quality. Using the example of the removal of stainless steel 1.4301, the paper shows that several surface properties like colour, gloss and roughness are closely linked with the material removal characteristics. Consequently, a change of these surface properties can arise by changing of the removal behaviour. For this purpose an established method was applied for the determination of the material removal characteristics in pulsed electrochemical machining (PECM) [3].The determination is performed with the help of removal experiments using a PEMCenter 8000. Thereby the current density J was varied based on a variation of the process input parameters feed rate vf and voltage Uq. Based on the determination of the material removal characteristics the machined surface quality, like colouring and surface structure, was examined with scanning electron microscopy (SEM) for investigated current densities. Furthermore the roughness of the machined surfaces was measured with the help of a confocal microscope. For this the surface parameter Sa corresponding DIN EN ISO 25178-2 was selected. Due to these results it is feasible to design a PECM process for a specific material which complies the requirements for feed rate and surface quality.