Global Patent Index - EP 2021147 A1

EP 2021147 A1 2009-02-11 - 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

EP 2021147 A1 (DE)

Application

EP 07728100 A

Priority

  • EP 2007053635 W
  • EP 06011252 A
  • EP 07728100 A

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 (invention and additional information)

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 (invention and additional information)

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

EPO simple patent family

EP 1870189 A1 20071226; EP 2021147 A1 20090211; WO 2007137903 A1 20071206

INPADOC legal status


2011-04-27 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20101029

2009-04-01 [RIN1] INVENTOR CHANGED BEFORE GRANT

- Inventor name: FOERSTER, RALF

2009-04-01 [RIN1] INVENTOR CHANGED BEFORE GRANT

- Inventor name: KLEIN, KARSTEN

2009-04-01 [RIN1] INVENTOR CHANGED BEFORE GRANT

- Inventor name: LAUDIEN, ULRICH

2009-04-01 [RIN1] INVENTOR CHANGED BEFORE GRANT

- Inventor name: SETTEGAST, SILKE

2009-04-01 [RIN1] INVENTOR CHANGED BEFORE GRANT

- Inventor name: SUBRAMANIAN, RAMESH

2009-02-11 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20081029

2009-02-11 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): 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

2009-02-11 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Countries: AL BA HR MK RS