MINIATURE DRILL AND METHOD FOR PROCESSING THE MINIATURE DRILL

摘要

A miniature drill and a method for processing the miniature drill are disclosed. The miniature drill comprises a drill tip (41) and a drill body (42). The drill tip (41) comprises two main cutting edges, two main tool faces and two auxiliary tool faces symmetrical with respect to the axial center of the miniature drill. The drill body (42) is provided with two chip flutes (44, 45) which rise in spiral, wherein the chip flutes (44, 45) comprise a long chip flute (44) and a short chip flute (45). The helix angle of the short chip flute (45) is different from that of the long chip flute (44). The short chip flute (45) and the long chip flute (44) are changed from a separate situation to a merging situation. The short chip flute (45) ends in the position where it is crossed with the long chip flute (44). The two chip flutes (44, 45) are formed as the long chip flute (44) and the short chip flute (45), the helix angle of the short chip flute (45) is different from that of the long chip flute (44), the short chip flute (45) ends in the position where it is crossed with the long chip flute (44), and the main part of the drill body (42) is only provided with the single long chip flute (44), so the drill has the advantages of increasing the rigid portion of the flute body, enlarging the thickness of the core and improving the rigidity of the drill body.