Preparation method of ultra-light multi-feature skin-free skeleton type composite material shell

Abstract

The invention relates to a preparation method of an ultra-light multi-feature skin-free skeleton type composite material shell. The preparation method comprises the following steps of automatically winding linear trajectory planning by arranging an end socket guiding and positioning device capable of freely moving, achieving accurate groove entering numerical control automatic winding of 'non-geodesic line 'equidistant spiral ribs and annular rib hot melting prepreg filaments and alternate proceeding of framework ribs and multi-feature structure laying are. Aiming at a multi-feature skin-free skeleton type structure, uniform and effective connection of side wall flanges, end frames and skeleton ribs is realized through balanced interactive coupling layering structure design, accurate calculation of a skeleton rib hot-melt prepreg filament winding cycle number, balanced interactive coupling rib winding-end frame-opening reinforcing area layering structure, rib scattering and the like, and the overall rigidity and stability of the product are ensured. By optimizing the design of a framework rib R-angle mold, a pre-compaction control technology and a reasonable curing process, the problems of poor rib size precision, rib defects and product quality defects caused by the problem of multi-feature structure curing pressurization interference due to edge overflow of a skin-free framework rib are solved, high-quality and high-dimensional-precision integrated forming of the ultra-light multi-feature skin-free framework composite material shell is achieved, the weight is reduced by 30% or above compared with a traditional skin structure, and the requirement for light weight of spaceflight models is met.

Description

technical field [0001] The invention relates to a method for preparing an ultra-light multi-feature skinless skeleton composite material shell, which belongs to the field of composite materials and technology. Background technique [0002] Advanced composite skeleton structures have been more and more widely used in the aerospace field due to their good geometric topology optimization, excellent structural load-bearing performance, high specific strength and specific stiffness. [0003] While inheriting many advantages such as high self-stability, strong buckling resistance, strong optimizability, low initial defect sensitivity, uniform stress distribution, and effective load distribution, the skinless composite skeleton structure inherits many advantages. It also has its own unique advantages: calculations and tests have shown that the load-bearing efficiency of the skeleton ribs in the composite skeleton structure is much higher than that of the skin; the use of skinless s...

AI Technical Summary

Problems solved by technology

Because there is no skin, it is more difficult to form the joints where the skeleton ribs intersect, and to connect the skeleton ribs to the end frame. The ribs overflow due to serious rib dimensional accuracy and rib defect problems are prominent. At present, there is no independent The developed and produced skinless composite skeleton structure is applied to engineering practice

[0004] In order to maximize the carrying capacity of a solid launch vehicle under development, its advanced upper-stage satellite bracket adopts an innovative ultra-lightweight multi-feature skinless skeleton composite material design, for this multi-feature skinless skeleton structure. method, there is no report at home and abroad

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