Method for treating turbine blades and device therefor

Patent metadata

Field	Value
Publication number	US-9403245-B2
Application number	US-201113822739-A
Country	US
Kind code	B2
Filing date	Sep 14, 2011
Priority date	Sep 14, 2010
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

A method is provided for treating turbine blades having holes for discharging cooling air. A protective layer is provided and then the holes that are partly or completely closed by the protective layer are opened again. Coordinates concerning the position of the holes are acquired before the protective layer is applied using a laser triangulation sensor using a light source generating a light beam and a light detector. The data obtained is used after application of the protective layer to control a removal device for removing protective layer partly or wholly covering the holes. Each hole is measured by the light beam being shone into the hole in different positions in relation to the longitudinal mid-axis of the latter. The light beam is shone into the respective hole in a plane at at least three different angles to the longitudinal mid-axis thereof.

First claim

The invention claimed is:

1. A device for determining the position of cooling air holes in turbine blades, the device comprising:
an optical measuring sensor suitable for an optical triangulation method, wherein the optical measuring sensor is fitted to a holder such that the position thereof can be varied,
at least one light source generating a light beam,
at least one light detector,
an evaluation device which is formed in such a way that, on the basis of the signals generated by the light detector when the light beam is shone into a cooling air hole in different positions with relation to a determined longitudinal mid-axis of the cooling air hole, it obtains coordinates of the position of the cooling air holes,
wherein the light source is adjustable on the holder in different angular positions in at least one plane, the different angular positions are based upon the determined longitudinal mid-axis, and the maximum angular positions with respect to the determined longitudinal mid-axis,
wherein the coordinates of the position of the cooling air holes represent at least three different angular positions of the light beam with respect to the determined longitudinal mid-axis, and
wherein the longitudinal axis of each cooling air hole is determined,
wherein the optical measuring sensor is a laser triangulation sensor, wherein the light source and light detector are combined to form a single measuring sensor, which is fitted to the holder such that the position thereof is variable.

2. The device as claimed in claim 1 , wherein the holder is a machine tool, or a coordinate measuring machine or a measuring arm.

3. The device as claimed in claim 1 , wherein the light source is adjustable on the holder in a plurality of planes and in each case in different angular positions.

4. The device as claimed in claim 1 , wherein the evaluation device is provided with a multidimensional image processing program for evaluating the signals generated by the light detector.

5. The device as claimed in claim 1 , further comprising a removal device for removing the protective layer in the area of the cooling air holes, wherein the removal device co-operates with the evaluation device in such a way that the removal device is aligned on the basis of the data about the cooling air holes that is prepared in the evaluation device.

6. The device as claimed in claim 5 , wherein the removal device is a laser removal device which generates a laser beam.

7. The device as claimed in claim 5 , wherein the alignment is made such that the laser beam from the laser removal device shines into the respective cooling air hole coaxially or parallel to the longitudinal mid-axis of the latter.

Assignees

• Arjakine Nikolai
• Melzer-Jokisch Torsten
• Thomaidis Dimitrios
• Siemens Ag

Inventors

• Arjakine Nikolai
• Melzer-Jokisch Torsten
• Thomaidis Dimitrios

Classifications

• Y10T29/49337

  Composite blade · CPC title

• F05D2230/31

  Layer deposition · CPC title

• F05D2260/80

  Diagnostics · CPC title

• F01D5/005 Primary

  Repairing methods or devices · CPC title

• F05D2230/80

  Repairing, retrofitting or upgrading methods · CPC title