Method of producing a noncircular cooling bore
AssigneeABB Research Ltd.
InventorsMichael Blöchlinger, Ivan Luketic, Klaus Semmler, Günter Wilfert
Life of this patent
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Abstract
In a method of forming a cooling bore in a wall of a workpiece, the configuration of a feed section and a diffuser section is selected, a throughbore is produced with a cross-sectional area within the cross-sectional area of the feed section, and the diffuser section is cut out by a beam- or jet-drilling method in such a way that the drilling beam or jet in the region of the feed section remains essentially within the cross-sectional area of the latter.
Claims19
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;
- and
- D) 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.
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;
- and
- D) 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 step B comprises selecting the discharge area of the diffuser section so that a boundary surface of the diffuser section which lies in the opposite direction to the direction of tilt is rounded off toward the axis.
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;
- and
- D) 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;
- and
- covering the outer surface of the wall, before step C, at least partly with a protective coating.
Dependencies are inferred from the claim text.