Process for coating a component having partially closed holes and process for opening the holes
View Patent ↗During the coating of a component including cooling-air holes, it is necessary, when remachining the coated cooling-air holes, to determine the correct alignment of the cooling-air row. A process is provided in that at least two cooling-air holes are kept clear by a masking material during the coating and the alignment of the cooling-air row is effected on the basis of these two unclosed cooling-air hole.
1. A process for opening a plurality of cooling-air holes of cooling-air rows in a component, comprising:
providing only a topmost and a bottommost hole in a row of more than the topmost and the bottommost holes with a masking material before the coating, wherein the topmost and the bottommost holes are not coated or are scarcely coated during a coating within the topmost and bottommost holes;
coating the component including a plurality of open cooling-air holes in the row and the two uncoated masked holes wherein the plurality of open cooling-air holes are completely filled with coating and thus completely closed;
removing the masking material from the two uncoated masked holes after the coating;
aligning the two uncoated masked holes with respect to a line between the two holes after the coating; and
reopening the plurality of coated open cooling-air holes by a machining machine using the alignment,
wherein an actual alignment of all holes arranged in the row of holes is determined by the line between the two uncoated masked holes, which are not coated during the coating, in the row of holes, in order to determine a position of the coated open cooling-air holes.
2. The process as claimed in claim 1 , wherein the topmost and the bottommost holes are cooling-air holes.