Tooling manufacturing method for preventing composite material forming tooling from air leakage

Abstract

The invention discloses a tooling manufacturing method for preventing composite material forming tooling from air leakage. The composite material forming tooling is used for forming composite material parts; the composite material forming tooling is assembled from a composite material laying mold and a supporting frame; The above-mentioned composite material laying mold is based on the transition mold, and is made of tooling prepreg materials of different thicknesses by hot pressing; and in the process of laying, the bead is laid on the R area and the corner area of ​​the transition mold, and the tooling The edge margin area of ​​the frame is paved with tooling prepreg, and a long strip of seam is laid in the area of ​​the butt joint. The photo frame paving avoids the expansion of edge defects to the inside caused by cutting and the splitting during bumping or demoulding during handling; the beading and seam patching strips further ensure the high temperature airtightness of the tooling. The tooling manufactured by the invention not only has good airtight performance, but also effectively reduces maintenance costs, ensures the molding quality and production cycle of composite parts, and has good practical and economic value.

Description

technical field [0001] The invention relates to a tooling manufacturing method for preventing composite material forming tooling from air leakage. Background technique [0002] Composite parts (hereinafter referred to as composite parts) are made of resin-based carbon fiber composite materials. Due to the advantages of resin-based carbon fiber composite materials, such as high specific strength and specific stiffness, high degree of structural integration, strong designability, good fatigue resistance, corrosion resistance, and good dimensional stability, it has become a popular choice for aviation, aerospace, transportation, etc. High-performance structural materials widely used in the field. Since the manufacture of composite parts must use specially designed tooling to complete the compounding of materials and the forming process of parts at the same time. Composite parts hardly need any further processing after solidification and molding, and their internal structure a...

AI Technical Summary

Problems solved by technology

However, due to the lack of fiber support at the joints of lap joints or butt joints, especially the joints where thick tooling prepregs are joined, tooling splits or air leakage are prone to occur, which in turn affects the airtightness of the tooling

[0008] In addition, the process margin needs to be considered in the manufacturing process of traditional composite molding tooling. Generally, the whole layer is paved from the edge of the tooling when paving. After the demoulding process is completed, the tooling is manually trimmed or CNC milled. The edge is trimmed; due to the fixed fiber direction of the paving tooling prepreg, once the edge of the tooling is trimmed or the edge of the tooling is bumped and worn, it is very easy to produce fine cracks, and these cracks will extend along the fiber direction To the net size area of ​​the tooling, penetrating cracks will occur, which will cause air leakage of the tooling and affect the use of the entire forming tooling

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