Cutting tool
AssigneeTungaloy Corporation
InventorKatsuhiro Sagara
Life of this patent
Estimating the term…
Abstract
Provided is a cutting tool in which one end side of a protruding cutting edge is sharpened while wear resistance is improved. The cutting tool of the present invention includes an end surface, a peripheral side surface that intersects the end surface, and a cutting edge in an intersecting ridgeline portion between the end surface and the peripheral side surface. When first and second points (A and B) are set on the cutting edge, the first point (A) protrudes further toward an outer side of the cutting tool than the second point (B). The cutting tool has a coating film on its surface. The cutting edge has a portion in which the thickness of the coating film gradually increases toward the second point (B) from the first point (A).
Claims12
A cutting tool (1) comprising:
- an end surface (10);
- a peripheral side surface (12) intersecting the end surface (10);
- and
- a cutting edge in an intersecting ridgeline portion between the end surface (10) and the peripheral side surface (12), wherein
- when first and second points (A and B) are set on the cutting edge (20), the first point (A) protrudes further toward an outer side of the cutting tool (1) than the second point (B),
- the cutting tool (1) further comprising:
- a coating film on a surface of the cutting tool, wherein
- the cutting edge (20) has a portion in which a thickness of the coating film (25) gradually increases toward the second point (B) from the first point (A).
A cutting tool comprising:
- an upper surface having a longitudinal direction and a lateral direction perpendicular to the longitudinal direction;
- a lower surface facing a direction opposite to the upper surface, the lower surface having the longitudinal direction and the lateral direction;
- a first side surface connected to the upper surface and the lower surface, the first side surface facing the longitudinal direction;
- a second side surface connected to the upper surface, the lower surface, and the first side surface, the second side surface facing the lateral direction;
- a third side surface connected to the upper surface, the lower surface, and the second side surface, the third side surface facing the longitudinal direction;
- a fourth side surface connected to the upper surface, the lower surface, the third side surface, and the first side surface, the fourth side surface facing the lateral direction;
- and
- a cutting edge formed in a connection portion between the upper surface and the first side surface, the cutting edge inclined relative to the second side surface and the fourth side surface such that a distance from a straight line that passes through the second side surface and the fourth side surface and is parallel to the lateral direction increases gradually toward the fourth side surface from the second side surface in a top view in which the cutting edge is viewed from a direction facing the upper surface, the cutting edge having a coating layer formed on a surface of the cutting edge, wherein
- a thickness of the coating layer gradually increases from a first point closer to the fourth side surface than to the second side surface to a second point closer to the second side surface than to the fourth side surface and spaced apart from the first point by a distance corresponding to not less than half of an entire length of the cutting edge in the top view.
Dependencies are inferred from the claim text.