Metal working – Method of mechanical manufacture – Shaping fiber or fibered material
Patent
1990-08-24
1992-05-19
Eley, Timothy V.
Metal working
Method of mechanical manufacture
Shaping fiber or fibered material
29715, B22D 1914
Patent
active
051135680
ABSTRACT:
The invention is concerned with a method and apparatus for producing a shaped filamentary structure and more particularly, to filamentary structures which can be subjected to further processing to produce a carbon-carbon product. A specific use of the invention is in the production of discs for use in aircraft braking systems.
The method includes needle punching a unidirectional layer of filaments to give a degree of dimensional stability; cutting a plurality of segments from the layer of needle punched filamentary material; assembling a plurality of segments in side-by-side contiguous relationship to produce a filamentary layer of the required structural shape; superimposing at least one similar layer on the first layer and needle punching the assembled layers to produce cross-linking of the layers.
In the preferred method of carrying out the invention, the layers of filamentary material are supported by a sub-structure which permits needle penetration, and this sub-structure is peeled off the final needle punched assembly. A further preferred feature includes assembling the segments in a former and rotating the former relative to a reciprocating needling head.
The invention also comprises an apparatus for producing a shaped filamentary structure comprising an open-topped receptable for the assembled segments; a needling head located over only part of the receptacle means for rotating the receptacle to bring a complete annulus of the filamentary segments in it under the needling head and a support located inside the receptacle and means for rotating the support with the receptacle, and lowering the support relatively to the receptacle during the needling operation.
REFERENCES:
patent: 4097983 (1978-07-01), Cole
patent: 4970052 (1988-12-01), Olry
Lawton Peter G.
Smith Norman
Adams, III W. Thad
Eley Timothy V.
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