Shear knife
A metal shearing tool demonstrating improved fatigue life having a body; an edge of the body having a first surface and a second surface; a cutting surface disposed between the first surface and the second surface. The edge has a substantial absence of finish marks substantially parallel with the cutting surface on all surfaces of the edge, and at least one of a curved profile surface and a radiused cutting surface.
1. A metal shearing tool comprising:
a body;
an edge of the body having a first surface and a second surface;
a cutting surface disposed between the first surface and the second surface;
wherein the edge has a convex curved profile, and wherein the edge further has a substantial absence of finish marks substantially parallel with the cutting surface.
2. The metal shearing tool of claim 1 , wherein the edge farther has a radius.
3. The metal shearing tool according to any one of the preceding claims, wherein the metal shearing tool demonstrates improved fatigue life.
4. A metal shearing tool comprising:
a body;
an edge of the body having a first surface and a second surface;
a cutting surface disposed between the first surface and the second surface;
wherein the edge has at least one of a convex curved profile and a radius, and wherein the edge further has a substantial absence of finish marks substantially parallel with the cutting surface;
wherein the metal shearing tool demonstrates improved fatigue life of at least 130% compared to the same metal shearing tool not having at least one of a convex curved profile, and a radius, and wherein the edge further has a substantial absence of finish marks substantially parallel with the cutting surface.
5. The metal shearing tool according to claim 4 , wherein the metal shearing tool demonstrates improved fatigue life of at least 200% compared to the same metal shearing tool not having at least one of a convex curved profile and a radius, and wherein the edge further has a substantial absence of finish marks substantially parallel with the cutting surface.
6. The metal shearing tool according to claim 5 , wherein the metal shearing tool demonstrates improved fatigue life of at least 450% compared to the same metal shearing tool not having at least one of a convex curved profile and a radius, and wherein the edge further has a substantial absence of finish marks substantially parallel with the cutting surface.