Back to results
US 4,318,645 AGranted
Cutting insert
AssigneeKennametal Inc.
InventorJames F. McCreery
Life of this patent
Estimating the term…
Abstract
A polygonal cutting insert of a hard wear resistant material is described. Located behind the cutting edge land in each corner of this insert is a bump. separating the bump from the cutting edge land is a lower secondary land. This secondary land has its maximum height and width in the corner areas of the insert. Its height and width gradually decrease as it extends away from the corner area in a direction parallel to the cutting edge.
Claims12
A cutting insert which comprises:
- a polygonal body having top and bottom faces with a peripheral wall having rounded corners joining said top and bottom faces;
- at least two angularly related cutting edges formed at the juncture of at least one face with said peripheral wall;
- a land area extending inwardly toward the center of said body from said cutting edge;
- a descending wall joining an inner edge of said land area and extending inwardly of the cutting edge of said polygonal body;
- a secondary land area in the area of said corner joining an inward edge of said descending wall and extending inwardly toward the center of the polygonal body;
- said secondary land having a width which is at a maximum in the corner and which decreases as the secondary land extends away from said corner;
- a secondary descending wall joining and extending inwardly from said secondary land;
- a planar face joining said secondary descending wall and extending inwardly toward the center of said body;
- said secondary land located at a secondary height above the planar face;
- said secondary height being a maximum in the corner area and diminishing as the secondary land extends away from said corner;
- and a bump located in the corner area and rising above said secondary land.
8 more elements
Dependencies are inferred from the claim text.