Drilling tool
AssigneeTungaloy Corporation
InventorHiroya Shikama
Life of this patent
Estimating the term…
Abstract
It is possible to reduce shoulder parts from being damaged while suppressing an increase in cutting resistance or abrasion of edges at a time of machining. A drilling tool for drilling machining includes: at least one major cutting edge; second cutting edges that are provided on an outer side of a tool radial direction of the major cutting edge; third cutting edges that are provided on the outer side of the tool radial direction of the second cutting edges; a first honing portion that is formed at the major cutting edge; second honing portions that are formed at the second cutting edges; and third honing portions that are formed at the third cutting edges. Honing sizes of the third honing portions are larger than a honing size of the first honing portion.
Claims7
A drilling tool for drilling machining, comprising:
- at least one major cutting edge;
- a second cutting edge that is provided on an outer side of a tool radial direction of the major cutting edge;
- a third cutting edge that is provided on the outer side of the tool radial direction of the second cutting edge;
- a first honing portion that is formed at the major cutting edge;
- a second honing portion that is formed at the second cutting edge;
- and
- a third honing portion that is formed at the third cutting edge,
- wherein a honing size of the third honing portion is larger than a honing size of the first honing portion;
- and
- wherein the honing size is a curvature radius of each of the first honing portion, the second honing portion, and the third honing portion.
A drilling tool for drilling machining, comprising:
- at least one major cutting edge;
- a second cutting edge that is provided on an outer side of a tool radial direction of the major cutting edge;
- a third cutting edge that is provided on the outer side of the tool radial direction of the second cutting edge;
- a first honing portion that is formed at the major cutting edge;
- a second honing portion that is formed at the second cutting edge;
- and
- a third honing portion that is formed at the third cutting edge,
- wherein a honing size of the third honing portion is larger than a honing size of the first honing portion;
- wherein the honing size is a width of each of the first honing portion, the second honing portion, and the third honing portion;
- and
- wherein the width is a width of the first honing portion, the second honing portion, or the third honing portion, seen from a side provided with a rake surface.
A drilling tool for drilling machining, comprising:
- at least one major cutting edge;
- a second cutting edge that is provided on an outer side of a tool radial direction of the major cutting edge;
- a third cutting edge that is provided on the outer side of the tool radial direction of the second cutting edge;
- a first honing portion that is formed at the major cutting edge;
- a second honing portion that is formed at the second cutting edge;
- and
- a third honing portion that is formed at the third cutting edge,
- wherein a honing size of the third honing portion is larger than a honing size of the first honing portion;
- wherein the honing size is a width of each of the first honing portion, the second honing portion, and the third honing portion;
- and
- wherein the width is the width of the first honing portion, the second honing portion, or the third honing portion, seen from a side provided with a flank.
Dependencies are inferred from the claim text.