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公开(公告)号：US20200156162A1
公开(公告)日：2020-05-21
申请号：US16191488
申请日：2018-11-15
Applicant: Kennametal Inc.
Inventor： Danny R. Davis , Stephen G. Pritchard
Abstract: An orbital drill includes a drilling portion, a shank portion, and a neck portion between the drilling portion and the shank portion. The drilling portion includes one or more right-handed spiral flutes with cutting edges having a positive axial rake angle for positive cutting action while orbiting into a material. The right-handed spiral flutes have a positive radial and axial rake angle. The drilling portion also includes one or more left-handed spiral flutes located rearward of the one or more right-handed spiral flutes with cutting edges having a positive axial and radial rake angle for positive cutting action while orbiting back out of the material and removing any material left in the hole, thereby eliminating a separate reaming operation. A method of machining a workpiece using the orbital drill is also disclosed.
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公开(公告)号：US20250153253A1
公开(公告)日：2025-05-15
申请号：US18388891
申请日：2023-11-13
Applicant: Kennametal Inc.
Inventor： Stephen M. George , Danny R. Davis
Abstract: A rotary cutting tool includes a shank portion and a cutting portion extending from the shank portion to a cutting tip. The cutting portion has a plurality of blades separated by flutes. Each of the blades includes a relief surface and a radial cutting edge formed at an intersection between a respective flute and the relief surface. The relief surface includes an inner eccentric relief immediately adjacent the radial cutting edge and an outer eccentric relief immediately adjacent the inner eccentric relief. The inner eccentric relief is formed with an inner eccentric relief angle, β, of less than about 5 degrees, and wherein the outer eccentric relief is formed with an outer eccentric relief angle, β, of between about 5 degrees and about 15 degrees. A method of making the rotary cutting tool is also described.
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公开(公告)号：US10710175B2
公开(公告)日：2020-07-14
申请号：US16191488
申请日：2018-11-15
Applicant: Kennametal Inc.
Inventor： Danny R. Davis , Stephen G. Pritchard
Abstract: An orbital drill includes a drilling portion, a shank portion, and a neck portion between the drilling portion and the shank portion. The drilling portion includes one or more right-handed spiral flutes with cutting edges having a positive axial rake angle for positive cutting action while orbiting into a material. The right-handed spiral flutes have a positive radial and axial rake angle. The drilling portion also includes one or more left-handed spiral flutes located rearward of the one or more right-handed spiral flutes with cutting edges having a positive axial and radial rake angle for positive cutting action while orbiting back out of the material and removing any material left in the hole, thereby eliminating a separate reaming operation. A method of machining a workpiece using the orbital drill is also disclosed.
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