24-03-2016 дата публикации
Номер: US20160082523A1
Принадлежит:
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. 11001111212111313121230. Drilling tool () for modifying , in particular recessing , a blind hole () having a thread section () , an end section ( , ′) following such thread section () , and a hole bottom ( , ′) following such end section ( , ′) in a blade root insert () of a wind turbine with the rotor blade being in mounted position ,{'b': 110', '120', '140', '150', '130', '110', '110', '12', '12', '1', '140, 'having a drill section () and a handling section (), with two main cutting edges () and a dead center () being provided at a drill bit () at the drill section (), characterized in that a maximum diameter of the drill section () is smaller than or equal to a diameter of the end section (, ′) of the blind hole () and a radially outer end of the two main cutting edges () is rounded, having preferably a radius of at least 4 mm.'}2100. Drilling tool () according to claim 1 ,{'b': '150', 'characterized in that the dead center () is rounded and preferably has a radius of at least 4 mm.'}3100. Drilling tool () according to claim 1 ,{'b': 160', '110', '130', '160, 'characterized in that minor cutting edges () are provided at the drill section () starting from the drill bit (), with the minor ...
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