Electric heating – Metal heating – By arc
Patent
1988-03-18
1990-03-13
Albritton, C. L.
Electric heating
Metal heating
By arc
21912166, B23K 2600
Patent
active
049084941
ABSTRACT:
A method is disclosed for the stabilized cutting of a stack of fibrous composite sheets (1) assembled into a preform (3). The method includes the steps of providing a plurality of fiber sheets; applying a binder (2) to each sheet, with the binder comprising a low weight fraction of the sheet and being noninhibitive to resin flow during molding; and stacking the sheets in a particular orientation and cutting the sheets to a desired pattern using a laser cutting system (5) which may include a computer control module (8) loaded with a digitized pattern of the desired contour. As the laser cuts the fabric sheets, the cut ends fuse with the binder rather than with each other, thereby preventing cross-fusing of the fibers and maintaining resin permeability at the sheet ends. With this method, a low cost, highly automated and repeatable process may be provided for producing fiber preforms without labor intensive multiple sheet cutting and cross-stitching, while avoiding frayed or unraveled sheet edges.
REFERENCES:
patent: 3927591 (1974-07-01), Gerber
patent: 3931491 (1976-01-01), Stumpf
patent: 4204448 (1980-05-01), Pearl
patent: 4266112 (1981-05-01), Niedermeyer
Diaz Nestor J.
Faiz Robert L.
Reinfelder William C.
Albritton C. L.
United Technologies Corporation
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