| 摘要 |
The present invention relates to a drilling tool and method for modifying a blind hole in a blade root insert of a wind turbine. The invention further relates to an apparatus and method for cleaning a blind hole. The method for modifying a blind hole comprises: removing a blade screw located in the blind hole, inserting a drilling tool into the blind hole, fixing the drilling tool in a drill, recessing the blind hole by a predetermined depth, with a maximum diameter of the end section and of the hole bottom after recessing being smaller than or equal to a diameter of the end section prior to recessing and a transition from the end section to the hole bottom being round after recessing, removing the drilling tool and the drill, mounting the blade screw in the modified blind hole. |
| 主权项 |
1. Drilling tool (100) for modifying, in particular recessing, a blind hole (1) having a thread section (11), an end section (12, 12′) following such thread section (11), and a hole bottom (13, 13′) following such end section (12, 12′) in a blade root insert (30) of a wind turbine with the rotor blade being in mounted position,
having a drill section (110) and a handling section (120), with two main cutting edges (140) and a dead center (150) being provided at a drill bit (130) at the drill section (110), characterized in that a maximum diameter of the drill section (110) is smaller than or equal to a diameter of the end section (12, 12′) of the blind hole (1) and a radially outer end of the two main cutting edges (140) is rounded, having preferably a radius of at least 4 mm. |
