Roto peening orbital drilling tool
AssigneeThe Boeing Company
InventorsNicholas R. Farrell, James D. Gamboa, Wesley E. Holleman, Gary Lipczynski
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Abstract
A machining tool incorporates a shaft having a first end configured to fit into a machining collet. A cutting portion extends from a second end of the shaft. A residual stress inducer is located between the first and second ends and includes a torsion element joined to the shaft at a connection end. A carbide tip is present on a free end opposite the connection end and the torsion element is configured such that a selected rotational speed, altered from a normal cutting speed, causes the carbide tip of the torsion element to contact a workpiece surface.
Claims15
A machining tool comprising:
- a shaft having a first end configured to fit into a machining collet;
- a cutting portion extending from a second end of the shaft;
- a residual stress inducer located between the first and second ends, the residual stress inducer having:
- a torsion element having a connection end and a free end, said torsion element joined to the shaft at the connection end;
- a carbide tip on the free end of the torsion element opposite the connection end,
- the torsion element configured such that at a selected rotational speed, altered from a cutting speed, the carbide tip of the torsion element contacts a workpiece surface.
A method for inducing residual stress in a workpiece surface comprising:
- machining the work piece at a cutting speed with a machine tool having
- a shaft having a first end configured to fit into a machining collet,
- a cutting portion extending from a second end of the shaft,
- a residual stress inducer located between the first and second ends, the residual stress inducer having:
- a torsion element having a connection end and a free end, said torsion element joined to the shaft at the connection end;
- a carbide tip on the free end of the torsion element opposite the connection end,
- the torsion element configured such that at a selected rotational speed, altered from a cutting speed, the carbide tip of the torsion element contacts a workpiece surface;
- resiliently restraining the residual stress inducer within an outer diameter of the cutting portion at the cutting speed;
- and,
- altering rotational speed of the tool to a selected rotational speed thereby extending the torsion element causing contact with the workpiece surface by the carbide tip on the torsion element.
Dependencies are inferred from the claim text.