A material positioning method for laying on a slender flexible mold

Abstract

The invention discloses a material sheet positioning method for paving on a slender flexible mold. A laser projector is used to project the contour lines of the head and tail of the web surface of the flexible mold on the clamping tooling and the center line of the web surface perpendicular to it. The cross positioning line composed of short lines on the normal plane is used for positioning and clamping the flexible mold; and through the positioning detection step, detection and local adjustment, so that the positioning of the flexible mold is qualified; The center line coincides with the center line of the web surface of the flexible mold projected by the laser projector, and the prepreg sheet is laid on the soft mold; finally, the soft mold with the prepreg sheet laid is used as the core mold, and directly The combination is positioned onto the metal forming auxiliary tooling for curing and molding, thus avoiding the risk of buckling of the pre-ply fibers during transfer of the prepreg blank. The method of the invention is convenient, the structure of the clamping tool is simple, the shared function is realized, the manufacturing cost is saved, and the utility model has excellent practical and popularization value.

Description

technical field [0001] The invention relates to a material sheet positioning method for laying on a slender flexible mould. Background technique [0002] I-beams are relatively common reinforced structural parts in composite material parts. They are divided into structural forms such as constant-section I-beams and variable-section I-beams. Word beam parts also have a hyperboloid structure, such as figure 1 and 2 shown. When paving this kind of parts, it is generally divided into four parts: upper, lower, left, and right, that is, the free edge is paved first, then the left vertical edge and the right vertical edge are paved, and then the edges are laminated; in the paving process, it is also necessary to fill the twist filaments, the structure of which is image 3 shown. In composite structural parts with variable-thickness curved surfaces, when the fiber angle of the parts is deviated, the strength, stiffness and stability of the parts will be seriously affected. In ...

AI Technical Summary

Problems solved by technology

Especially the fiber angle of ±45° unidirectional fiber prepreg paving, if there is a deviation, the appearance of the part will be deformed after curing, which will reduce the mechanical properties of the part

[0003] At present, the molding method based on the autoclave process in the industry is basically metal mandrel molding or soft mold molding. Metal material, heavy weight, very inconvenient to operate, and in the case of large composite material parts, in order to ensure product dimensional accuracy and positioning benchmarks, the precision requirements of the mold must be high

In the soft mold molding process, due to the poor strength and stability of the soft mold itself and the large deviation in positioning, it is impossible to directly lay and position on the soft mold. Generally, special metal tooling is used to lay the material. , and then manually transferred to the airbag tooling for combined positioning, which is time-consuming and labor-intensive, and there is a risk of buckling of the pre-laid fiber during the transfer process

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