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1. (WO2019024966) MILL BIT FOR THE MANUFACTURE OF A WIND TURBINE BLADE AND METHOD OF FORMING SAME
注意: このテキストは、OCR 処理によってテキスト化されたものです。法的な用途には PDF 版をご利用ください。

What is claimed is:

1 . A mill bit for the manufacture of a wind turbine blade, comprising:

an elongate base body having a proximal end, a distal end, an outer surface, and an internal bore that defines an inner surface;

one or more flutes formed on the outer surface that defines one or more teeth; and

an abrasive coating on at least a portion of the outer surface, wherein the one or more flutes are free of the abrasive coating.

2. The mill bit according to claim 1 , wherein the one or more flutes has a surface roughness less than or equal to about Ra = 8 microinches (0.2 micrometers).

3. The mill bit according to claim 1 , wherein the grain size in the abrasive coating is about D501 or greater, preferably wherein the abrasive coating includes industrial diamonds or cubic boron nitride (CBN).

4. The mill bit according to any of the preceding claims, wherein the one or more flutes are helical flutes.

5. The mill bit according to any of the preceding claims, wherein the inner surface includes an abrasive coating.

6. The mill bit according to claim 5, wherein the inner surface defines one or more void strips that are free of the abrasive coating to define one or more flutes on the inner surface, preferably wherein said one or more void strips has a surface roughness less than or equal to about Ra = 8 microinches (0.2 micrometers).

7. The mill bit according to claim 6, wherein an interface between the abrasive coating and the one or more void strips defines a cutting edge.

8. The mill bit according to any of claims 6-7, wherein the one or more void strips define one or more linear flutes on the inner surface.

9. The mill bit according to any of the preceding claims, further comprising one or more porting bores extending through a wall of the base body to fluidly connect an external environment with the internal bore.

10. The mill bit according to claim 9, wherein there are a plurality of porting bores, and the porting bores are longitudinally and/or circumferentially spaced from one another.

1 1 . The mill bit according to claim 10, wherein the plurality of bores includes a first ring of circumferentially spaced porting bores, a second ring of circumferentially spaced porting bores, and a third ring of circumferentially spaced porting bores, wherein the first, second and third rings are longitudinally spaced from one another.

12. The mill bit according to claim 1 1 , wherein the number of porting bores in each of the first, second and third rings corresponds to the number of flutes on the outer surface.

13. The mill bit according to any of claims 9-12, wherein each of the one or more porting bores is open to a flute on the outer surface.

14. The mill bit according to claim 13, when dependent from any of claims 6-8, wherein each of the one or more porting bores is open to a void strip on the inner surface.

15. A method of making a mill bit for the manufacture of a wind turbine blade, comprising:

providing an elongate base body having a proximal end, a distal end, an outer surface, and an internal bore that defines an inner surface, and one or more flutes formed on the outer surface that defines one or more teeth; and selectively applying an abrasive coating to the outer surface such that the one or more teeth include the abrasive coating and the one or more flutes are free of the abrasive coating, said mill bit preferably being a mill bit according to any preceding claim.