Drill tool
AssigneeTaeguTec, Ltd.
InventorByung Gyun Bae
Life of this patent
Estimating the term…
Abstract
A drill tool including a drill body having an inner insert and an outer insert at an end portion of the drill body. The distance from a central axis of the drill body to the outer insert is greater than the distance from the central axis to the inner insert. The cutting edges of the inner and outer inserts can be chamfered with the inner insert chambered at a radially inward portion and the outer insert chamfered at a radially outward portion. The inner insert and the outer insert can be mirror symmetric to one another. The inner insert and the outer insert are mounted to the drill body such that an effective cutting length of the inner insert equals an effective cutting length of the outer insert, the effective cutting lengths being measured in a direction perpendicular to the central axis.
Claims20
A drill tool, comprising:
- a drill body having a central axis defining a forward to rear direction;
- an inner insert comprising four cutting edges rotationally symmetric to each other, wherein the inner insert is mounted to an end portion of the drill body adjacent to the central axis;
- and
- an outer insert comprising four cutting edges rotationally symmetric to each other, wherein the outer insert is mounted to the end portion of the drill body on an opposite side of the inner insert with respect to the central axis, and whose distance from the central axis is farther than that of the inner insert;
- wherein a radially inward side of the cutting edge of the inner insert is chamfered such that a non-zero angle is formed between said radially inward side and a plane perpendicular to the central axis;
- wherein a radially outward side of the cutting edge of the outer insert is chamfered such that a non-zero angle is formed between said radially outward side and said plane perpendicular to the central axis;
- wherein the inner insert and the outer insert are mirror symmetric to one another;
- and
- wherein the inner insert and the outer insert are mounted to the drill body such that the ratio of an effective cutting edge length of the inner insert to an effective cutting edge length of the outer insert satisfies 50:50, the effective cutting lengths being measured in a direction perpendicular to the central axis.
A drill tool, comprising:
- a drill body having a central axis defining a forward to rear direction;
- an indexable inner insert mounted to an end portion of the drill body adjacent to the central axis;
- and
- an indexable outer insert mounted to the end portion of the drill body on an opposite side of the central axis as the inner insert with respect to the central axis, the outer insert being further from the central axis than the inner insert;
- wherein the inner insert and the outer insert are mounted to the drill body such that the ratio of an effective cutting length of the inner insert to an effective cutting length of the outer insert satisfies substantially 50:50, the effective cutting lengths being measured in a direction perpendicular to the central axis;
- and
- wherein the inner insert and the outer insert are mirror symmetric to one another.
A drill tool, comprising:
- a drill body having a central axis defining a forward to rear direction;
- a radially inner insert mounted to an end portion of the drill body adjacent to the central axis, the inner insert being four-way rotationally symmetric;
- and
- a radially outer insert mounted to the end portion of the drill body on an opposite side of the central axis as the inner insert with respect to the central axis, the outer insert being further from the central axis than the inner insert, the outer insert being four-way rotationally symmetric;
- wherein the inner insert and the outer insert are mounted to the drill body such that an effective cutting length of the inner insert is equal to an effective cutting length of the outer insert, the effective cutting lengths being measured in a direction perpendicular to the central axis;
- and
- wherein the inner insert and the outer insert are mirror symmetric to one another.
Dependencies are inferred from the claim text.