Manufacturing method and production line of continuous fiber composite material spring and spring

Abstract

The invention discloses a production line of a continuous fiber composite material spring. A layer of thermoplastic film is wound outside a to-be-cured continuous fiber bundle before the to-be-cured continuous fiber bundle is cured and formed by a spring forming and curing mold, and the continuous fiber bundle wound with the thermoplastic film is fed into the spring forming and curing mold after being subjected to circumferential spiral extrusion. In the process of winding the thermoplastic film around the to-be-cured continuous fiber bundle, secondary compression and fastening can be generated on the to-be-cured continuous fiber bundle, gaps and bubbles of all fibers among the to-be-cured continuous fiber bundle are reduced, and the density of the cured continuous fiber spring is improved; and meanwhile, after the fiber bundle wound with the thermoplastic film is spirally extruded in the circumferential direction, the to-be-cured continuous fiber bundle is further extruded, the density of the to-be-cured continuous fiber bundle is further improved, at the moment, the thermoplastic film wrapping the to-be-cured fiber bundle can prevent the to-be-cured fiber bundle from bursting and scattering due to stress, and the appearance quality and the molded dimension precision of products are improved.

Description

technical field [0001] The invention relates to the application field of continuous fiber composite materials, in particular to a method for manufacturing a continuous fiber composite material spring, a production line suitable for continuous fiber composite material springs and a spring made of continuous fiber composite material. Background technique [0002] In the prior art, springs are manufactured from continuous fiber composite materials, and the fibers / rovings that are mostly used are soaked in the matrix material and then twisted continuously into fiber bundles, which are heated and cured by a spring forming and curing mold to form a spring. During the winding process of the fiber being applied to the spring core, because it is impregnated multiple times by the matrix material, such as resin, thus forming a wet fiber bundle to be cured, and the fiber bundle to be cured is then formed in the spring forming curing mold It is wound with a helical groove corresponding t...

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Problems solved by technology

[0003] At present, the main disadvantage of this method is that, due to multiple infiltrations, a large amount of matrix material will drip during the transportation of the fiber bundles to be cured, resulting in a reduction in the resin content of the product and serious contamination of the spring production line

[0004] In particular, the bonding of the fiber bundles to be cured and the parts of the spring forming and curing mold will cause great difficulty in the spring forming and demoulding. At the same time, it will also pollute the spiral groove of the spring forming and curing mold, which will cause the fiber bundles to be cured and the spring to be cured. The parts of the mold are bonded, and at the same time, the product size cannot be effectively controlled resulting in large tolerances

In addition, the matrix material bonded to the spiral groove in the spring forming and curing mold is difficult to remove, and it will also cause high cleaning costs. This will lead to a long shutdown and cleaning time within a certain production cycle, so production cannot be realized. continuous process

[0005] In the patent application whose application number is: CN201380072982.9, and the application title is: equipment and method for manufacturing springs from continuous fiber composite materials, there is the following problem: in the process of manufacturing springs from existing continuous fiber composite materials, the Coating thermoplastics on the outside of the cured fiber bundles will not ensure a smooth and uniform appearance, but will also cause thermoplastics to drip, causing environmental pollution and cleaning costs. Effective wrapping cannot be formed on the surface of the fiber bundle to be cured. At the same time, when the fiber bundle to be cured is cured by a spring forming curing mold, high temperature curing will undoubtedly lead to deformation or cracking of the thermoplastic material

[0006] If a metal plate is used to cover the outer surface of the fiber bundle to be cured, there are many problems such as insufficient softness, waste of resources, high production cost, poor elasticity, and difficulty in unwinding.

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