Method for manufacturing self-made auxiliary tooling for forming of large-curvature heteromorphic C-shaped frame type part

Abstract

The invention relates to a method for manufacturing a self-made auxiliary tooling for forming of a large-curvature heteromorphic C-shaped frame type part. The method comprises the following steps in specific: (1) splicing foam; (2) milling foam in a numerical control manner: milling the spliced foam into C-shaped foam; (3) laying craft pieces: by taking the milled C-shaped foam with smooth surface as a male die laying die, laying craft piece preform bodies according to a part laying layer; (4) transferring the craft piece preform bodies laid on the C-shaped foam male die and the C-shaped foam male die in a female die forming die together to form a female-male die combination die and cure the craft pieces; (5) breaking and taking out C-shaped male die foam, cleaning the surfaces of the craft pieces, laying smooth single-side band gel mold cloth, laying prepreg with a 2mm thickness on a plane zone, adopting a laying layer staggered transitional manner on a near-R zone, laying unvulcanized rubber on the R zone and a vertical side zone, and manufacturing the auxiliary tooling after curing. A self-made auxiliary craft cover plate modelled from the craft piece through the scheme is good in suitability, smooth in surface and accurate in molded surface.

Description

technical field [0001] The invention relates to the field of manufacturing composite material parts with large-curvature special-shaped C-shaped frames, in particular to a forming process method of self-made auxiliary tooling capable of improving the quality of large-curvature special-shaped C-shaped frame parts. Background technique [0002] C-shaped frame parts are an important part of the main load-bearing structure of the fuselage. They are mainly used for the connection between the rear fuselage panels of large passenger aircraft, and at the same time play a role in supporting the skeleton. At present, foreign civil aircraft fuselage frames adopt low-cost manufacturing solutions, such as three-dimensional weaving / RTM (resin transfer molding) and NCF (non-crease fabric) fabric / RTM processes, etc., while under the existing domestic technical conditions, The vacuum bag-autoclave method is still used to manufacture carbon fiber composite C-shaped frame parts. C-shaped fram...

AI Technical Summary

Problems solved by technology

C-shaped frame parts have complex structures, large curvature, and L-shaped angle materials, making it difficult to manufacture

The traditional process method cannot guarantee the quality and thickness of the parts very well, and because the R area at the corner is affected by the shape and space size, the accuracy of the thickness of the corner area cannot be guaranteed, and the C-shaped web and the L-shaped angle The surface of the part in the coincident area is uneven and there is a step difference

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