Patent ID: 6307175
Filing Date: 2001-10-23
Classification: B23K,F05B,F05D

Abstract:
A method for forming a cooling bore in a wall of a workpiece, the cooling bore, in the flow sequence, having a feed section of constant cross-sectional area and a diffuser section widening toward an outlet at an outer surface of the wall, comprising the steps of:A) selecting the shape and size of the cross-sectional area and an axis of the feed section;B) selecting the depth of the diffuser section and the shape and size of its discharge area at the outlet;C) producing a throughbore having a cross-sectional area which lies within the cross-sectional area, selected in step A, of the feed section; andD) cutting out the diffuser section with a method selected from the group consisting of beam-drilling and jet-drilling, the drilling beam or jet being directed so that, in the region of the feed section, the drilling beam or jet remains essentially within the cross-sectional area selected in step A;wherein the diffuser section is cut straight in step D, so that the boundary surfaces of the diffuser section have no curvature in the direction of flow of the cooling bore.