Plastic and nonmetallic article shaping or treating: processes – Stereolithographic shaping from liquid precursor
Patent
1996-03-25
1998-07-28
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Stereolithographic shaping from liquid precursor
264135, 264250, 264265, 264497, B29C 3508, B29C 4102
Patent
active
057859191
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to structural cellular components and is particularly although not exclusively concerned with a structural cellular component for a noise attenuation panel.
In patent application publication No. GB-A-2223448 a noise attenuation panel is disclosed comprising a backing component part, a facing component part and a cellular component part having a multiplicity of open-ended juxtaposed cells. The backing component part extends across the ends of the cells of the cellular component part at the rear thereof and the facing component part extends across the ends of the cells of the cellular component part at the front thereof. The facing component part comprises or includes an outer facing sheet which is made of a porous permeable thermoplastics material and preferably the porous permeable thermoplastics material is produced by powder sintering of a thermoplastics material.
In GB-A-2223448 the cellular component part comprises a front cellular sub-component having a multiplicity of open-ended juxtaposed cells, a rear cellular sub-component having a further multiplicity of open-ended juxtaposed cells and a septum component which extends across the ends of the cells of the rear cellular sub-component at the front thereof and the ends of the cells of the front cellular sub-component at the rear thereof. The septum component is made of a porous permeable thermoplastics sheet material and is preferably produced by powder sintering of a thermoplastics material.
While the noise attenuation panel disclosed in GB-A-2223448 has been found to be successful for use in aero engine environments, it suffers from a number of disadvantages. In particular, in order to include the septum component in the noise attenuation panel, it is necessary to construct two separate cellular sub-components and join them together by means of the septum component or to split or cut the cellular component into two sub-components and join them to the septum component. Where two septum components are required then three separate cellular sub-components need to be provided leading to complex manufacturing procedures. Furthermore, since the or each septum component is in the form of a continuous sheet of material, the configuration of the septum within the panel is limited insofar as it is required to lie in a continuous surface.
In GB-A-2252076, there is disclosed a noise attenuation panel which has one or more septum components, but which does not require the provision of cellular sub-components, and there is also disclosed a method of manufacturing the panel.
In GB 2252076 the noise attenuation panel comprises a cellular component which has a front face and a rear face and a multiplicity of cells each of which extends from the front face to the rear face and is formed by wall portions which extend from the front face to the rear face, and is characterised by the provision in each cell in a predetermined position therein where the wall portions forming the cell are continuous of a cell dividing septum element which extends across the cell and at which it is secured to the wall portions to divide the cell into two subcells.
The method of manufacturing the noise attenuation panel disclosed in GB 2252076 comprises the steps of first forming the cellular component without the provision in each cell of a cell dividing septum element, bringing a septum sheet into engagement with the cellular component such that the edges of the wall portions at a face of the cellular component cut through the septum sheet to form a multiplicity of cell dividing septum elements and allowing or causing each cell dividing septum element formed from the septum sheet to advance in the cell to a predetermined position therein at which it is secured to the wall portions of the cell thereby to divide the cell into two subcells.
In an embodiment of the invention disclosed in GB 2252076 the method includes the further step of bringing one or more further septum sheets into engagement with the cellular component such that the
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Short Brothers PLC
Tentoni Leo B.
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