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US 9,839,984 B2Granted
Method of making a cutting tap with a correction grind
AssigneeKennametal Inc.
InventorSteven R. Burns
Life of this patent
Estimating the term…
Abstract
A method of making a cutting tap includes: providing an elongate tap body having an axial forward end, an axial rearward end and a central longitudinal axis; securing the axial rearward end of the tap body in a grinding machine; and forming in the axial forward end of the tap body a correction grind and a main flute in one continuous grinding operation. A cutting tap made by the invention is also provided.
Claims17
A method of making a cutting tap, comprising:
- providing an elongate tap body having an axial forward end, an axial rearward end and a central longitudinal axis;
- securing the axial rearward end of the tap body in a grinding machine;
- forming a correction grind and a main flute in the axial forward end of the tap body with a grinding wheel in one continuous grinding operation,
- wherein the correction grind is adjacent to the cutting point, and the main flute is axially rearward of the correction grind;
- and
- wherein the grinding wheel does not lose contact with the tap body during the continuous grinding operation;
- and forming a reinforced land in the tap body, wherein the reinforced land is adjacent the main flute.
4 more elements
A method of making a cutting tap, comprising:
- providing an elongate tap body having an axial forward end terminating in a point, an axial rearward end including a shank and a central longitudinal axis;
- securing the shank of the tap body in a grinding machine;
- forming in the axial forward end of the tap body a correction grind adjacent the point and a main flute axially rearward of the correction grind in one continuous grinding operation with the grinding wheel never losing contact with the tap during the continuous grinding operation, wherein the correction grind and the main flute are ground sequentially while the tap body remains secured in the grinding machine;
- further including forming the correction grind and the main flute to have a continuously variable helix angle that increases from low to high beginning at the axial forward end of the tap body and extending rearwardly toward the axial rearward end;
- and forming a reinforced land in the tap body, wherein the reinforced land is adjacent the main flute.
2 more elements
Dependencies are inferred from the claim text.