当前申请(专利权)人地址：
Incorporated in USA - Delaware, 811 4th Street, West Des Moines, Iowa 50265, United States of America
摘要：
A method of additive manufacturing comprises additively forming a workpiece (100, figure 1) defining an interior passage (102) therethrough and a beam (106) running through and spaced apart from the interior passage, wherein the method comprises surface treating a passage surface of the interior passage by forcing an abrasive flow machining fluid between the beam and the passage surface. Preferably the beam is removed from the workpiece after the surface treatment. The method may include additively manufacturing the beam and workpiece with bridge structures (108, figure 2) suspending the beam in the interior passage. The method preferably includes forming the beam in the interior passage with a gap 202 between the beam and passage surface that varies within the interior passage to concentrate the surface treatment on a predetermined portion of the passage surface. Preferably the gap varies axially and more preferably the beam comprises a bulge 207 adjacent the predetermined portion. The workpiece may include at least a portion of a fuel injector for a gas turbine engine.
权利要求：
What is claimed is:
1. A method of additive manufacturing comprising;
additively forming a workpiece, wherein the workpiece defines an interior passage therethrough with a passage surface, wherein additively forming the workpiece includes additively forming a beam running through the interior passage spaced apart from the passage surface; and
surface treating the passage surface using abrasive flow machining wherein an abrasive flow machining fluid is forced to flow between the beam and the passage surface.
2. A method as recited in claim 1, further comprising removing the beam from the workpiece after surface treating the passage surface.
3. A method as recited in claim 1 or 2, wherein forming a beam running through the interior passage includes additively manufacturing the beam and workpiece with bridge structures suspending the beam in the interior passage.
4. A method as recited in claim 3, further comprising releasing the beam from the workpiece after surface treating by removing the bridge structures for removal of the beam from the interior passage.
S. A method as recited in any preceding claim, wherein forming the beam includes forming the beam in the interior passage with a gap between the beam and passage surface that varies
within the interior passage to concentrate surface treatment on a predetermined portion of the passage surface.
6. A method as recited in claim 5, wherein the gap varies axially along the interior passage. 7. A method as recited in claim 6, wherein forming the beam includes forming the beam with a bulge adjacent the predetermined portion of the passage surface.
8. A method as recited in any preceding claim, wherein the interior passage 1s a flow passage for a fluid.
9. A method as recited in claim 8, wherein the interior passage 1s a flow passage for a liquid. 10. A method as recited in any preceding claim, wherein the workpiece includes at least a portion of a fuel injector, and wherein the interior passage is a liquid fuel passage of the fuel injector.
11. A method as recited in any of claims 1 to 8, wherein the workpiece includes at least a portion of a fuel injector, and wherein the interior passage is an air passage of the fuel injector. 12. A method as recited in any of claims 1 to 8, wherein the workpiece includes at least a portion of a fuel injector, and wherein the interior passage is a gaseous fuel passage of the fuel injector.