| 摘要 |
PROBLEM TO BE SOLVED: To provide a drill bit device for burring, including a fixed blade part and the required number of rocking blade parts, in which the required number of radial grooves are formed extending in the radial direction from the substantial center on the forward end of the fixed blade part, the rocking blades are fitted in the radial grooves, and the rocking blades are suitably radially rocked by a rocking means to be projected from the side of the fixed blade part. SOLUTION: In this drill bit device for burring, since a work can be subjected to burring only by advance and retreat strokes required for boring with a drill bit, a work taking no space at the back, especially small-diameter tube material can be burred. When a lever mechanism is used as a rocking means, it can be stored compact in the drill blade, so that the drill bit for burring can be used similarly to the conventional drill bit. COPYRIGHT: (C)2004,JPO
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