Drilling system for deep holes

摘要

The invention is directed to a drill system that better uses the power curve of modern machine tools. The drill system uses a two-step drill, utilizing IC inserts to perform the major hole diameter cutting, and a central drilling system. In examples, the IC inserts can be set in a drill head in a single or double effective configuration. A central drilling system cuts the remaining minor diameter portion of the hole, and is configured to see less cutting surface footage, due to its position from the rotating center of the tool. The central drilling system may include a “self-centering” geometry, such that the drill head of the tool with be guided throughout the depth of the hole. The drill system allows for a large diameter deep hole that remains straight throughout to be drilled at higher speed and lighter feed rates thus offering a more productive tool that takes advantage of the power curves and lower thrust capabilities of modern machine tools.

主权项

1. A drilling system for producing deep holes in a workpiece, comprising:
a holder body having an outer diameter; a drill head having an outer diameter attachable to the holder body, with the holder body having a first mating surface, and the drill head having a second mating surface that engages the first mating surface of the holder body when attached thereto, the drill head having at least one cutting insert attached thereto; the first and second mating surfaces including one of the at least one dovetail protrusion formed to extend to the outer diameter of the mating surface and the at least one dovetail groove formed to extend to the outer diameter of the mating surface, with the at least one protrusion or groove formed on opposing first and second mating surface, and wherein the drill head is assembled to the holder body by rotating the drill head relative to the holder body about the axis of the tool until the at least one dovetail protrusion engages with the at least one dovetail groove to the outer diameter and locks the drill head into place in association with the holder body, the drill head having at least one aperture from the top of the drill head to the second mating surface, and at least one fastener extending through the at least one aperture and fastened to the holder body, wherein upon assembly of the drill head to the holder body, the at least one fastener carries substantially no load during drilling.