Polishing of complex internal geometries
a geometries and complex technology, applied in the direction of edge grinding machines, grinding machine components, manufacturing tools, etc., can solve the problems of uneven material loss, inability to effectively polish complex shapes with many branches, channels, features and perturbations, and unsuitable for polishing the internal surface of a component, so as to achieve the effect of being readily tuned to a specific mr
Inactive Publication Date: 2016-12-29
ROLLS ROYCE PLC
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- Abstract
- Description
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- Application Information
AI Technical Summary
Benefits of technology
The invention uses an AC electromagnet to constantly alter the rheology of the MR fluid. This means that the polarity of the magnets on each cycle is constantly changing, which allows for a polishing effect without the need to manipulate the component or rotate the magnets. The AC wave characteristics can be easily adjusted to suit different polishing operations, and multiple coils can be used to maximize the motion and agitation of the MR fluid.
Problems solved by technology
The slurry follows a line of least resistance and works well on consistent cross sections (a bent tube or manifold) but will often not effectively polish complex shapes with many branches, channels, features and perturbations.
In complex geometries there can be uneven material loss due to varying current densities at corners, edges and blind holes.
This can be effective for external surfaces, but is generally unsuitable for polishing internal surfaces of a component.
All of the abovementioned processes are limited in their application.
In particular, they cannot be used for polishing the internal geometry of a complex shape of a multi-phase engineering alloy.
However, drawbacks still remain with this method.
Method used
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Embodiment Construction
[0056]With reference to FIG. 1, a ducted fan gas turbine engine generally indicated at 10 has a principal and rotational axis 11. The engine 10 comprises, in axial flow series, an air intake 12, a propulsive fan 13, an intermediate pressure compressor 14, a high-pressure compressor 15, combustion equipment 16, a high-pressure turbine 17, and intermediate pressure turbine 18, a low-pressure turbine 19 and a core engine exhaust nozzle 20. A nacelle 21 generally surrounds the engine 10 and defines the intake 12, a bypass duct 22 and a bypass exhaust nozzle 23.
[0057]The gas turbine engine 10 works in a conventional manner so that air entering the intake 12 is accelerated by the fan 13 to produce two air flows: a first air flow into the intermediate pressure compressor 14 and a second air flow which passes through a bypass duct 22 to provide propulsive thrust. The intermediate pressure compressor 14 compresses the air flow directed into it before delivering that air to the high pressure ...
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Abstract
This invention concerns improvements in the polishing of internal surfaces and structures of components, particularly components with a complex internal geometry. Embodiments of the invention use an alternating current electromagnet (48) driven by a signal generator (50) to constantly alter the rheology of the magnetorheological fluid (5). An improved magnetorheological fluid (25,30) is also disclosed.
Description
BACKGROUND OF THE INVENTION[0001]The present invention relates to the polishing of internal surfaces and structures of components. In particular, the invention relates to the polishing of internal surfaces and structures of components with a complex internal geometry, for example components for use in the aerospace industry.[0002]Providing a smooth surface finish on a component is often desirable. In particular in the aerospace industry, a smooth surface finish may be necessary for any one of a number of reasons including: reducing pressure loss, reducing cavitation, improving fatigue life, etc. With constant cross-section components such as pipes the polishing can be consistent across the internal surface. For complex geometries with constrictions, bends, and other variation in the cross-sectional geometries the component may be over-polished in some regions and under-polished in others.[0003]When components are manufactured by additive layer manufacturing (ALM) processes, the surf...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B24B1/00B24B31/10
CPCB24B31/102B24B1/005B24B31/112B24B31/14
Inventor LAMBOURNE, ALEXISWILLIAMS, PAULCULLEN, JOHN JA
Owner ROLLS ROYCE PLC