Indexable drill insert
AssigneeKennametal India Limited
InventorKarthic Ramesh
Life of this patent
Estimating the term…
Abstract
A quadrangular indexable drill insert includes: a top surface, a bottom surface, a side surface adjoining the top and bottom surfaces from four sides of the insert, four cutting edges configured at the intersection of the side surface and the top surface, and a screw hole disposed at the center of the insert. Each cutting edge includes: a first part edge; a second part edge extending from the first part edge; a third part edge extends away from a reference axis, a nose portion adjoins the first part edge with the third part edge of a succeeding cutting edge and a transitional edge joining the second and third part edges. The transitional part edge forms an angle of about 10° to about 90° with respect to the reference axis and forms a convex curve with the second part edge and a concave curve with the third part edge.
Claims11
A quadrangular indexable drill insert comprising:
- a top surface;
- a bottom surface smaller than the top surface;
- four side surfaces, each adjoining the top surface and the bottom surface from one of four sides of the drill insert;
- an insert screw hole disposed at the center of the drill insert;
- and
- four cutting edges, each configured at the intersection of one of the side surfaces and the top surface, each of the cutting edges comprising:
- a first part edge extending from a first nose portion;
- a second part edge extending from the first part edge;
- and
- a third part edge extending to a second nose portion,
- wherein the first part edge and the second part edge are joined by a convex corner such that each of the first part edge and the second part edge merge directly into the convex corner,
- wherein the second part edge is disposed parallel with respect to a reference axis,
- wherein the first part edge is disposed at a first angle with respect to the reference axis such that the first part edge is closer to the reference axis near the first nose portion than near the second part edge,
- wherein the second part edge and the third part edge are joined together by a transitional part edge, the transitional part edge forming an angle in the range of from about 10° to about 90° with respect to the reference axis,
- wherein the third part edge is disposed at a second angle with respect to the reference axis such that the third part edge is closer to the reference axis near the second nose portion than near the transitional part edge,
- wherein the transitional part edge forms a convex curve with the second part edge and a concave curve with the third part edge, and
- wherein the first nose portion is of a predetermined radius and joins the first part edge of one cutting edge with the third part edge of a succeeding cutting edge.
Dependencies are inferred from the claim text.