METHODS AND APPARATUS FOR MAKING RING-SHAPED PARTS OUT OF A COMPOSITE MATERIAL, AS WELL AS PREFORMS THEREFOR

Preforms for producing annular parts of composite material are produced by winding a strip (1) of fibrous material around an elliptical mandrel (10) to produce an elliptical sleeve which can be cut obliquely, cutting taking plac e either before or after one or more densification steps. The cutting p...

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Bibliographische Detailangaben
Hauptverfasser:	JOUIN, JEAN-MARIE, OLRY, PIERRE, COUPE, DOMINIQUE
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING BLASTING BRAIDING BRAKES CLUTCHES COTTON-WOOL COUPLINGS FOR TRANSMITTING ROTATION ENGINEERING ELEMENTS AND UNITS FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS,NON-WOVEN FABRICS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS KNITTING LACE-MAKING LIGHTING MAKING GRANULES OR PREFORMS MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARYMATERIAL MECHANICAL ENGINEERING NON-WOVEN FABRICS PERFORMING OPERATIONS PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TEXTILES THERMAL INSULATION IN GENERAL TRANSPORTING TRIMMINGS WADDING WEAPONS WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	Preforms for producing annular parts of composite material are produced by winding a strip (1) of fibrous material around an elliptical mandrel (10) to produce an elliptical sleeve which can be cut obliquely, cutting taking plac e either before or after one or more densification steps. The cutting plane is inclin ed relative to the right cross section of the elliptical sleeve, and the inner and outer portions of the cut rings are machined to obtain circular elements. Such elements can produce annular parts of composite material having a reduced tendency to delamination under circumferential stress. The superposed layers are needlin g together during winding. A uniform needling density per unit area can be obtained by controlled displacement of the needle board (5) and of the elliptical mandrel (10) relative to each other as the mandrel turns, to compensate for the eccentricity of the cross section of the mandrel. These methods are particularly suitable for producing brake disk preforms.