Method for improving the magnitude of compressive stress developed in the surface of a part
AssigneeSurface Technology Holdings, Ltd.
InventorPaul S. Prevey
Life of this patent
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Abstract
This invention relates to a method and an apparatus for performing the method of inducing compressive residual stress along the surface of a part. In the preferred embodiment of the invention, the method includes burnishing or deep rolling a surface using a first and a second roller or ball burnishing members, whereby the first and second burnishing members may have a different diameter and/or modulus of elasticity. In another preferred embodiment of the invention, the burnishing operations may be performed while the surface of the part is at different temperatures.
Claims6
A method of inducing residual compressive stresses in the surface of a part comprising the steps of:
- selecting at least one region along the surface of the part for inducing a first layer of compressive stresses within the surface of the part;
- performing a first burnishing operation using a first burnishing member to induce a first layer of compressive surface stresses along a selected region of the part;
- and
- performing a second burnishing operation using a second burnishing member to induce a second layer of compressive surfaces stresses along a selected region of the part;
- wherein said first burnishing member has a first diameter and said second burnishing member having a second different diameter.
A method of inducing residual compressive stresses in the surface of a part comprising the steps of:
- selecting at least one region along the surface of the part for inducing a first layer of compressive stresses within the surface of the part;
- performing a first burnishing operation using a first burnishing member to induce a first layer of compressive surface stresses along a selected region of the part;
- and
- performing a second burnishing operation using a second burnishing member to induce a second layer of compressive surfaces stresses along a selected region of the part;
- wherein the first burnishing operation is performed when the temperature of the surface is at a first temperature and the second burnishing operation is performed when the temperature of the surface is at a temperature different than the first temperature.
A method of inducing residual compressive stresses in the surface of a part comprising the steps of:
- selecting at least one region along the surface of the part for inducing a first layer of compressive stresses within the surface of the part;
- performing a first burnishing operation using a first burnishing member to induce a first layer of compressive surface stresses along a selected region of the part;
- and
- performing a second burnishing operation using a second burnishing member to induce a second layer of compressive surfaces stresses along a selected region of the part;
- wherein said first burnishing member has a modulus of elasticity that is different than the modulus of elasticity of said second burnishing member.
Dependencies are inferred from the claim text.