Small-diameter drill
US-9522428-B2 · Dec 20, 2016 · US
Drill
US2016207119A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016207119-A1 |
| Application number | US-201414913000-A |
| Country | US |
| Kind code | A1 |
| Filing date | Aug 20, 2014 |
| Priority date | Aug 22, 2013 |
| Publication date | Jul 21, 2016 |
| Grant date | — |
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- Title
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- Abstract
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- First independent claim
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Abstract
Official abstract text for this publication.
Provided is a drill suitable for high-efficiency working. A cut debris discharge groove is formed in the outer periphery of the drill body front end section rotated about the axis, and a cutting edge is formed at the front end of the drill body. The wall surface of the cut debris discharge groove, which faces the rotational direction of the drill, is formed to have a concave curve line shape in a cross-section perpendicular to the axis, the concave curve line shape extending along a first circular arc.
First claim
Opening claim text (preview).
1 . A drill in which a cut debris discharge groove is formed at an outer periphery of a front end section of a drill body rotated about an axis and a cutting edge is formed at a front end of the drill body, wherein a wall surface of the cut debris discharge groove, which faces a rotational direction of the drill, is formed to have a concave curve line shape extending in a cross-section perpendicular to the axis, the concave curve line shape extending along a first circular arc, wherein a bottom surface of the cut debris discharge groove, which continues to the wall surface and which faces an outer peripheral side of the drill body, is formed to have a concave curve line shape in the cross-section perpendicular to the axis, the concave curve line shape extending along a second circular arc circumscribing a core diameter circle at the front end section of the drill body, and wherein the first circular arc has a greater radius than the second circular arc and is in contact with the second circular arc at a position closer to the leading edge side than the point of contact between the second circular arc and the core diameter circle. 2 . The drill according to claim 1 , wherein in the cross-section perpendicular to the axis, the point of contact between the first and second circular arcs is within a range of 0.1×D to 0.35×D with respect to the external diameter D of the cutting edge from the axis. 3 . The drill according to claim 1 , wherein with respect to the external diameter D of the cutting edge, the radius of the first circular arc is within a range of 1.0×D to 3.0×D, and the radius of the second circular arc is within a range of 0.2×D to 0.4×D. 4 . The drill according to claim 2 , wherein with respect to the external diameter D of the cutting edge, the radius of the first circular arc is within a range of 1.0×D to 3.0×D, and the radius of the second circular arc is within a range of 0.2×D to 0.4×D.
Assignees
Inventors
Classifications
Spiral grooves · CPC title
of special form not otherwise provided for · CPC title
Cooling and lubrication · CPC title
Spiral channel · CPC title
- B23B51/02Primary
Twist drills · CPC title
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Frequently asked questions
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- What does patent US2016207119A1 cover?
- Provided is a drill suitable for high-efficiency working. A cut debris discharge groove is formed in the outer periphery of the drill body front end section rotated about the axis, and a cutting edge is formed at the front end of the drill body. The wall surface of the cut debris discharge groove, which faces the rotational direction of the drill, is formed to have a concave curve line shape in…
- Who is the assignee on this patent?
- Mitsubishi Materials Corp
- What technology area does this patent fall under?
- Primary CPC classification B23B51/02. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Thu Jul 21 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).