摘要:
A tool (10) for use in forming moulded articles, the tool (10) comprising a tool body (12) formed of a foamed material, a resinous material (14) on the tool body (12) and elastomeric material (16) between said tool body (12) and resinous material (14) to inhibit the movement of resin from the resinous material into the tool body (12). The invention also provides a method of manufacturing a tool, a method of moulding articles using such a tool, and elastomeric material for use in forming a tool. One particular application of the tools of the present invention is in the formation or manufacture of moulded articles using curable, resinous composite materials.
摘要:
A pressure transmitter for use in the curing of composite components may take the form of a caul plate, pressure intensifier or vacuum bag and is formed from a curable elastomeric material which is partially cured, normally when supported on a mould, at a temperature not exceeding 100 °C. It is subsequently further cured at, for example 175 °C, while unsupported. It may incorporate a reinforcing layer formed from a curable resin pre-impregnated fibrous material.
摘要:
The invention relates to a method of assembling a structure, particularly those structures requiring very tight tolerances. The structure may be assembled by positioning shim material (20) on at least part of a sub-structure (2), curing the shim material (20) in situ, machining the cured shim material (20) to a desired thickness, and then assembling outer layer parts (4, 8) to the sub-structure such that the shim material is situated between the sub-structure and the outer parts. The shim material may be machined to different thicknesses at different locations on the sub-structure, so that, when assembled, the outer layer parts together conform to a predetermined profile. This is especially advantageous in the manufacture of airframes, where the outer layer panels must provide a smooth surface to avoid unwanted aerodynamic effects.
摘要:
The invention relates to a shim material (20) for use in assembling structures and a method of producing the shim material. The shim material is machinable and comprises at least a resin, a filler and a curing agent, and is capable of being cured at a temperature of below 80°C. The shim material is produced by heating the resin to at least 80°C, adding the filler to the resin, cooling the resin to below 60°C, adding a curing agent to the resin, and then forming the resin into a sheet of desired thickness. Structures, such as airframe structures may be assembled using the shim material by positioning shim material on at least part of a sub-structure (2), curing the shim material in situ, machining the cured shim material to a desired thickness, and then assembling outer layer (4,8) parts to the sub-structure with the shim material between structure and parts.
摘要:
A tool (10) for use in forming moulded articles, comprising a tool body (12) formed of a ceramic material, preferably porous with a porosity of between 40% and 60% and in the form of a foam. The tool body (12) is profiled to define the mould surface(s) of the tool (10). The outer surface (11) of the tool (10) can be sealed with epoxy sealant to provide the mould surface(s) of the tool. An elastomeric layer (16) can be applied to the surface(s) of the tool body (12) and a resinous material (14), such as a fibre reinforced material, applied to the elastomeric layer (16), wherein the elastomeric layer (16) inhibits the movement of resin from the resinous layer (14) into the porous ceramic body, and the resinous layer (14) defines the mould surface.
摘要:
A moulding material (10) comprising a fibrous layer (12) carrying resinous material (14) to have at least one area (16a, 16b, 16c and 16d) of relatively high resin content and at least one other area (18a, 18b and 18c) of relatively low resin content (18a, 18b and 18c) defined on a surface (20) of the fibrous layer (12) such that upon curing or partial curing resin from the said relatively high resin content area(s) (16a, 16b, 16c and 16d) moves over the relatively low resin content area(s) (18a, 18b and 18c) to provide a substantially even distribution of resin between the areas.
摘要:
A method of moulding an article from prepreg including laying a sheet of prepreg on a mould to conform with the mould includes also treating the resin of the prepreg to increase its viscosity to a predetermined value which, when the sheet is cured by the simultaneous application of pressure and heat results in a reduction in voids within the laminate and pits on the moulded surface as compared with a conventional prepreg moulding technique, curing the resin and removing the cured or partially cured article from the mould. The treatment of the resin may be achieved by applying heat to the resin of the prepreg amending its formulation or any other appropriate method.
摘要:
A method of moulding a composite material which includes a fibre reinforcement within a resin comprises laying alternately on a mould first and second layers of fibre material pre-impregnated with uncured resin, where the resin content of the first layer is different from that of the second layer and the combination of layers gives the desired overall total volume fraction of fibres and resin in the laminate, enclosing the layers within an impervious membrane, evacuating the membrane and applying heat to the layers to flow gellate and at least partially cure the resin and during the process to allow released gasses and vapours to flow along the layers of lower resin content towards the membrane for subsequent evaluation.
摘要:
A method of manufacturing a composite and of securing a metallic coating to a resin-based composite material, comprising the provision of a keying structure on a metallic electroplated preform and bringing the keying structure and the composite material together under conditions to cause the composite material and the keying structure to interlock. The invention also provides a composite (10) comprising a resin-based composite material (12) with a metallic coating (14) on a surface, or part surface (16) thereof, the metallic coating (14) comprising an outer electroplated preform, and an inner keying structure (20) which is located generally between said electroplated preform (18) and the composite material (12) to provide attachment of the electroplated preform (18) on the composite material (12).