Method for positioning material sheet paved on slender soft mold

Abstract

The invention discloses a method for positioning a material sheet paved on a slender soft mold. The method comprises the following steps that a laser projector is adopted to project head and tail contour lines of the web surface of the soft mold on a clamping tool and cross-shaped positioning line composed of the center line of the web surface and normal plane short line perpendicular to the center line of the web surface to position, clamp and fix the soft mold; the detection and local adjustment are carried out through positioning detection step; so that the soft mold is positioned to be qualified; then, a material sheet center line marked on the prepreg material sheet lining paper is overlapped with the center line of the web surface of the soft mold projected by the laser projector, and the prepreg material sheet is paved on the soft mold; and finally, the soft mold paved with the prepreg material sheet is used as a core mold and directly combined and positioned to a metal formingauxiliary tool to be cured and formed, and therefore the risk of buckling of fibers of a pre-paving layer in the prepreg material sheet transferring process is avoided. The method is convenient, the clamping tool is simple in structure, the sharing function is achieved, the manufacturing cost is saved, and the method 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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