| 摘要 |
A method of producing cooling apertures (68) in a combustion chamber head (50) comprises mechanically drilling a plurality of cooling apertures (68) through the combustion chamber head (50) from the downstream side (50B) of the combustion chamber head (50A. A tool (94) is inserted through at least one aperture (56) for a fuel injector from the downstream side (50B) of the combustion chamber head (50) and the tool (94) is rotated about its axis whilst within the aperture (56) for a fuel injector. Fluid is supplied from the drilling machine through the tool (94) and jets of fluid (F) are directed from nozzles (98) in the tool (94) with at least a radial component towards the cooling apertures (68) on the upstream side (50A) of the combustion chamber head (50) to remove burrs and/or caps (70) adjacent the cooling apertures (68). The present disclosure enables cooling apertures (68) to be drilled through a combustion chamber head (58) using conventional mechanical drilling in a viable and cost effective manner. |
