Plate spring of interlayer reinforced two-dimensional/three-dimensional braided composite material and preparation method thereof

Abstract

The invention discloses a plate spring of interlayer reinforced two-dimensional / three-dimensional braided composite material and a preparation method thereof. A monolayer fabric of different fiber materials is formed by three-dimensional stereo braiding, the monolayer of the special fiber material and in the three-dimensional braided structure is designed on the special part in relatively high rigid or strength requirements, and finally the layers are vertically seamed to make the laminated monolayer structure form a whole body. Finally, the fabric of the two-dimensional / three-dimensional composite structure and resin are repeatedly soaked and composited through a resin vacuum transfer moulding technology, and the novel automobile plate spring of composite material which is high in strength and rigidity, small in deformation amount, large in fatigues resistance, long in service life and high in high-low temperature environment adaptability is prepared through gradient heating and curing. The plate spring uses the novel structure and the structure form to satisfy the use requirements of different loading capacities especially automobiles with heavy loads, and the problems such as interlayer fracture caused by relatively low fatigue load strength of the common plate spring of two-dimensional laminated structure composite material are conquered.

Description

technical field [0001] The invention belongs to the technical field of preparation of leaf springs, and relates to a two-dimensional / three-dimensional braided composite automobile leaf spring with interlayer reinforcement and a preparation method thereof. Background technique [0002] At present, most of the leaf springs used in trucks are made of metal, and most of them are composed of multi-piece structures. The friction between the multi-layer plates at the suspension part of the truck makes it have higher cushioning and shock absorption performance. It is widely used in transportation equipment such as passenger cars, rail vehicles or large trucks with relatively large loads. However, the metal material of the traditional leaf spring has a large self-weight. When assembled at the bottom of a heavy vehicle, although it has good shock absorption performance, its large weight will inevitably cause the load space of the vehicle to be compressed. Safety features have also be...

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Problems solved by technology

Among them, vacuum introduction of resin is the vacuum bag pressing method commonly used in composite material molding at present. This preparation process can be applied to leaf spring structures of different shapes, and the design flexibility is relatively large. However, the pressure conditions brought by the vacuum degree of molding are limited. , will inevitably lead to high resin content, and the phenomenon of uneven distribution of resin will inevitably lead to high porosity during the introduction process, while the currently commonly used fiber reinforced structure is a two-dimensional fabric laminated structure, and the increase in porosity will inevitably bring The interlayer bonding is weak, resulting in the reduction of the interlayer strength of the leaf spring products under long-term fatigue load, which will affect the safety of the vehicle in severe cases

[0005] Therefore, how to overcome the problem of weak interlayer bonding strength of fiber composite leaf springs under the fatigue loading conditions of vehicles with high load requirements has become the focus of research on automotive composite leaf springs.

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