High-precision forming mold and method for thickly-laid composite material boxes

Abstract

The invention relates to a composite material forming technology and specifically relates to a high-precision forming mold and method for thickly-laid composite material boxes. The high-precision forming mold for thickly-laid composite material boxes is designed in the present invention and comprises a box bottom female die (1), a box body sidewall pressure transfer block (2), a knockout plate (3), a box sidewall female die (4), a male die (5) and a bottom plate (6). On the basis of the high-precision forming mold for thickly-laid composite material boxes, box prepreg layers of a composite material are laid one by one on the male die (5); every two to three prepreg layers are vacuumized and pre-compacted, and a plurality of times of vacuumizing and pre-compacting are carried out until the prepregs are completely fitted with the die; subsequently, more than three times of pre-pressing by using a press are carried out, followed by a process of opening the mold to supplement materials and shaping, and hot press molding. The accuracy of inner and outer molded surfaces of a composite material box formed by using the mold and the method of the present invention can be above +/-mm, and therefore, the composite material box can be glued in an aerospace part as a force-bearing part and may meet later assembly requirements.

Description

technical field [0001] The invention belongs to composite material forming technology, and in particular relates to a high-precision forming mold and method for a box body of thickly laminated composite material. Background technique [0002] Such as figure 1 As shown, the composite material box referred to in the present invention is used as a load-bearing structure, and its inner surface is used for assembly, and the outer surface is used for board bonding of aviation components. The accuracy of the inner and outer profiles directly affects the internal quality of later parts. [0003] In order to ensure the internal quality and design strength of the composite material load-bearing box, it is generally formed by the autoclave method. Most of the autoclave forming methods use single-sided molding. The accuracy of the molded surface depends on the mold accuracy, which can reach ±0.1mm or more; the molding accuracy of the non-moulded surface is mainly determined by the layi...

AI Technical Summary

Problems solved by technology

For thick-laminated composite material boxes with a thickness greater than 2mm, it is difficult to guarantee the shape accuracy of the non-film surface

In addition, for the autoclave forming method of single-sided molding, if the composite box body is laminated with variable thickness, the surface accuracy of the non-film surface is greatly affected by the laying position accuracy of the transition zone

[0004] In short, the molding process of the one-sided mold of the autoclave cannot meet the molding requirements.

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