Rotary cutting tool
AssigneeExactaform Cutting Tools Limited
InventorPeter Raynor
Life of this patent
Estimating the term…
Abstract
A rotary cutting tool (10) comprises a shank (12) formed of a first material of a first hardness. The shank (12) has a first end (12a), and a plurality of elements (14) are provided at the first end (12a) of the shank (12). The elements (14) are formed of a second material of a second hardness greater than that of the first hardness. The elements (14) provide a platform to be able to create a plurality of cutting edges or teeth (18, 20a). A method of forming such a rotary cutting tool is also provided.
Claims24
A blank for forming into a cutting tool, the blank comprising:
- a shank formed of a first material of a first hardness, the shank comprising a plurality of flat surfaces along a longitudinal portion at a first end of said shank;
- and
- a plurality of flat elements attached to said plurality of flat surfaces of said shank at a first end of said shank, the plurality of flat elements being formed of a second material of a second hardness greater than that of the first hardness, the plurality of flat elements for receiving a plurality of cutting edges thereon to form the cutting tool, the plurality of flat elements forming a continuous region around the shank;
- and
- wherein the longitudinal portion consists of the plurality of flat surfaces abutting one another around a complete cross sectional circumference of the first end, each of said flat surfaces being tangent to a notional diameter of an inscribed circle of the shank in the longitudinal portion at the first end.
A method of forming a blank for a rotary cutting tool, the method comprising:
- providing a shank formed of a first material of a first hardness, the shank comprising a plurality of flat surfaces along a longitudinal portion at a first end of said shank;
- and
- attaching a plurality of flat elements to said plurality of flat surfaces at a first end of said shank, said plurality of flat elements being formed of a second material having a second hardness greater than the first hardness, the plurality of flat elements for receiving a plurality of cutting edges thereon to form the cutting tool, the plurality of flat elements forming a continuous region around the shank and wherein the longitudinal portion consists of the plurality of flat surfaces abutting one another around a complete cross sectional circumference of the first end, each of said flat surfaces being tangent to a notional diameter of an inscribed circle of the shank in the longitudinal portion at the first end.
Dependencies are inferred from the claim text.