Composite molding mandrel and manufacturing method

Abstract

The invention relates to a composite molding mandrel and a manufacturing method, and belongs to the field of hollow composite molding mandrel. The mandrel comprises at least one air inlet port; a water-soluble material layer or a low-temperature melting material layer, an air bag and a composite elastic material are sequentially arranged on the section from inside to outside in the thickness direction, of the mandrel, wherein the water-soluble material of the mandrel is polyvinyl alcohol or polyethylene glycol; the air bag is manufactured through nylon; the composite elastic material is continuous fiber reinforced silicone rubber, continuous fiber reinforced polyurethane resin or continuous fiber reinforced emulsified rubber. According to the mandrel, the continuous fibers in the compositeelastic material are in the same direction as the force bearing direction that the mandrel is drawn out from a composite product in later period. The outer layer of the mandrel is manufactured through the composite elastic material which can be adhered to the air bag in the intermediate layer to form a composite structure, so that the mandrel is hardly broken during use, and as a result, the service life of the mandrel is prolonged.

Description

technical field [0001] The invention relates to the field of composite material molding core molds, in particular to a core mold structure for hollow composite material molding and a preparation method thereof. Background technique [0002] In the hollow composite material molding technology, there are mainly two types of mandrels used, one is a nylon air duct air bag, and the other is a silicone rubber air bag. For nylon air duct technology, the air duct is easy to wrinkle when the composite material is formed, resulting in wrinkles on the inner wall of the product, and there is a hidden danger of bag breakage, which affects the stability of product quality. [0003] For silicone rubber airbag technology, such as Chinese Patent Application No. 201210498620.3 once disclosed a composite material molding method is the use of this technology, it pours an elastic material in a mold, rotate, vibrate or leave the mold to make the elastic material An air bag is formed in the mold....

AI Technical Summary

Problems solved by technology

For nylon air duct technology, the air duct is easy to wrinkle when the composite material is formed, which leads to wrinkles on the inner wall of the product, and there is a hidden danger of bag breakage, which affects the stability of product quality

[0003] For silicone rubber airbag technology, such as Chinese Patent Application No. 201210498620.3 once disclosed a composite material molding method is the use of this technology, it pours an elastic material in a mold, rotate, vibrate or leave the mold to make the elastic material An air bag is formed in the mold. This method of forming the air bag cannot control its surface to completely cover the cavity surface of the mold without forming air bubbles. It cannot ensure that the thickness of the air bag is uniform, so there are inevitably hidden dangers in subsequent production, and in the later stage When the airbag is extracted from the molded product, the outer silicone rubber is prone to damage during the extraction process, and the service life is short

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