Process skin for autoclave forming of composite product and preparation method of process skin

Abstract

The embodiment of the invention discloses a process skin for autoclave forming of a composite product and a preparation method of the process skin. In the autoclave forming process, the process skin is put on the upper surface of the composite product, an auxiliary material is put on the upper surface of the process skin, under the pressure applied by an autoclave, a prepreg preform is overall pressed downwards, the internal quality is improved, and wrinkles, caused by the weak deformation capacity of the auxiliary material, generated on the surface of the composite product are avoided. Meanwhile, a molded surface consistent with the upper surface of the composite product is arranged on the process skin, so that the appearance precision of the composite product is well guaranteed. The process skin can be widely applied to autoclave forming of composite products with complex shapes, and the appearance precision and the internal quality of the products are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of structural composite materials, and relates to a process skin for forming composite material parts in autoclave and a preparation method thereof. Background technique [0002] Advanced composite materials reinforced by continuous fibers such as carbon fibers have outstanding advantages such as high specific strength, specific modulus, low density, good corrosion resistance, fatigue resistance, and strong designability, and are more widely used in aerospace and other fields and in-depth. In the field of advanced manufacturing, more and more metal parts with complex shapes are replaced by composite parts. However, limited by the molding process characteristics of composite material parts, the high-precision molding of corresponding composite material parts has become a manufacturing difficulty. In addition, composite parts have undergone a transformation from non-load-bearing members to secondary load-bea...

AI Technical Summary

Problems solved by technology

Autoclave forming, vacuum diversion forming and vacuum bag forming are single-sided molds, the lower surface is attached to the mold, and the shape accuracy is high, while the upper surface needs to be laid with auxiliary materials such as isolation film and release cloth, and there is no mold guarantee. Poor shape accuracy

Especially for composite materials with variable thickness, large thickness, and multiple curvatures with complex shapes, it is more difficult to guarantee the shape accuracy when single-sided molds are used.

To solve this problem, compression molding with closed mold molding can be used. The problem is that the manufacturing efficiency is low, it takes a long time for the hot press equipment, it is difficult to meet the requirements of large-scale mass production, and the internal quality of composite parts molded by compression molding is relatively low. Low, poor quality stability, difficult to apply to parts with higher quality requirements

RTM closed mold molding is a liquid molding process. The fiber volume fraction of composite materials is lower than that of compression molding and autoclave molding, which is difficult to meet for composite parts with high design requirements and harsh operating conditions.

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