Importance

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Abstract

The present invention relates to the field of manufacture of miniature drills and discloses a miniature drill, which includes a drill body, a drill tip formed at one end of the drill body, and a plurality of spiral chip slots spiraling on a surface of the drill body; the chip slots include a long chip slot, a short chip slot, and a communicating chip slot, the long chip slot and the short chip slot are arranged at intervals and have the same helix angles, and the long chip slot is communicated with the short chip slot by the communicating slot. In the miniature drill provided by the present invention, the long chip slot and the short chip slot that have the same helix angle and do not intersect are communicated with each other by the communicating slot, which effectively avoids swing of the drill tip caused by deviation of the centroid from the rotation axis and affecting the position accuracy of the drilled holes; moreover, the communicating slot broadens the widths of the chip slots, increases the chip space, and thereby improves the heat dissipating property; furthermore, the communicating slot reduces the width of the body clearance and reduces heat generated by friction between the body clearance and walls of the drilled holes, which enhances the ability of resisting breaks caused by the thermal deformation of the miniature drill.

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First Claim