EP 2021147 A1 20090211 - METHOD FOR SPARK-EROSIVE TREATMENT OF ELECTRICALLY NONCONDUCTIVE MATERIALS
Title (en)
METHOD FOR SPARK-EROSIVE TREATMENT OF ELECTRICALLY NONCONDUCTIVE MATERIALS
Title (de)
VERFAHREN ZUR FUNKENEROSIVEN BEARBEITUNG EINES ELEKTRISCH NICHT LEITENDEN MATERIALS
Title (fr)
PROCÉDÉ DE TRAITEMENT PAR ÉLECTRO-ÉROSION D'UN MATÉRIAU ÉLECTRIQUEMENT NON CONDUCTEUR
Publication
Application
Priority
- EP 2007053635 W 20070413
- EP 06011252 A 20060531
- EP 07728100 A 20070413
Abstract (en)
[origin: EP1870189A1] A preliminary bore (3) is formed in the electrically non-conducting material, e.g. using a laser. Electrically-conducting material (4) is introduced into the bore and is connected as an auxiliary electrode. A final bore (8) is formed along the preliminary bore, using a working electrode (6) for spark erosion. The diameter of the final bore (8) exceeds that of the preliminary bore. The electrically-conductive material is graphite, an organic compound or a metal. The inner wall of the preliminary bore is coated with electrically-conducting material. This material is introduced into the bore as a wire or rod. It is optionally a fluid. The electrically non-conductive material is a ceramic. It contains or comprises completely- or partially-stabilized zirconium oxide. The electrically non-conducting material is a coating on a component. It is a thermally-insulating layer. The component is part of a turbine, being a running blade or a flow guidance blade.
IPC 8 full level
B23H 9/14 (2006.01); B23H 9/10 (2006.01); B23K 26/38 (2006.01); B23K 26/40 (2006.01); F01D 5/18 (2006.01); B23K 101/00 (2006.01)
CPC (source: EP)
B23H 9/10 (2013.01); B23H 9/14 (2013.01); B23K 26/382 (2015.10); B23K 26/40 (2013.01); B23K 2101/001 (2018.08); B23K 2103/50 (2018.08); B23K 2103/52 (2018.08); F05B 2230/102 (2013.01)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK RS
DOCDB simple family (publication)
EP 1870189 A1 20071226; EP 2021147 A1 20090211; WO 2007137903 A1 20071206
DOCDB simple family (application)
EP 06011252 A 20060531; EP 07728100 A 20070413; EP 2007053635 W 20070413