The present invention is a wind power generation capable of removing burrs generated in the perforated holes of the ball cage and chamfering the inner surface while manufacturing a ball cage that maintains constant power transmission by spaced and arranging the main shaft bearing balls of a wind turbine at precise intervals. It relates to an automatic chamfering device on the inner surface of the perforated hole of the slewing bearing ball cage. The chamfering machines 40 and 40 ′ include an eccentric rotary motor M installed in the chamfering frame F through the rotation shaft 31. 32) is rotated, and an upward feed cylinder 33 is installed on one side of the central shaft 32, and an eccentric housing 30 is installed at the lower end to rotate eccentrically, and a cutting tool bracket 24 is installed on one side of the cutting tool bracket. In (24), a tool rotation motor (M'') rotates the cutting shaft 21 forward so that the cutting tool 20 coupled with the rotation guide pin 23 to the cutting head 22 can be rotated forward, and an eccentric housing One side of (30) and one side of the cutting tool bracket (24) are connected with an elastic supporter (34) so that the cutting tool bracket (24) can be supported with a constant elastic force, and the material at the bottom of the other side of the chamfering framing (F) It is characterized in that it is possible to compress the upper surface of the ball cage (B) (B'') by installing a crimping damper (35).
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