Automobile plate spring of three-dimensional braided composite material and preparation method thereof

Abstract

The invention discloses an automobile plate spring of three-dimensional braided composite material and a preparation method thereof. The plate spring is of a three-dimensional fabric structure which is formed by combining and waving hybrid fibers, the material of fibers, the amount of tows and the structure of the fabric are adjusted to make the important part of the plate spring higher in strength and fatigue rigidity and longer in use durability, and simultaneously a resin vacuum transfer moulding technology is cooperated to uniformly soak, cure and shape the special composite resin, so as to obtain the heavy truck plate spring of three-dimensional braided composite material, the heavy truck plate spring is light in weight, strong in fatigue resistance, high in strength, rigidity and dimensional stability and relatively long in service life, and the problems of the common plate spring of two-dimensional laminated structure composite material such as interlayer fracture under fatigue loading condition are conquered.

Description

technical field [0001] The invention belongs to the technical field of preparation of leaf springs, in particular to a three-dimensional braided composite automobile leaf spring and a preparation method thereof. Background technique [0002] At present, the leaf springs used in large-scale heavy-duty vehicles are in the form of multi-piece combination of metal materials. This multi-piece metal leaf spring combination structure with variable cross-section has high cushioning and shock absorption characteristics through the friction between the plates. Heavy vehicles, such as passenger cars, off-road vehicles, large trucks, rail vehicles, etc., have better shock absorption performance, so metal leaf springs are widely used in vehicle suspension chassis. However, the heavy weight of metal materials has high shock absorption and buffer performance, but for vehicles with large loads, the steel leaf springs with large dead weight will inevitably reduce the safety performance of th...

AI Technical Summary

Problems solved by technology

[0004] At present, high-performance composite material leaf springs are all made of high-performance resin-based fiber composite materials, and most of their molding technologies use traditional composite material molding processes, such as compression molding, resin transfer molding or winding molding. Composite leaf springs have regular structure and high density, but molding technology molds are indispensable. For leaf springs with special-shaped structures, the design of the mold structure becomes a difficult point in product processing, and the design flexibility is low; while for winding In terms of molding, there are also such problems. Most of the leaf springs prepared by winding are regular-shaped products, and the processing of products with flexible structural requirements is relatively difficult; while resin transfer molding is suitable for products with complex structures. The degree of freedom of design is large, and the processing efficiency is high, but the interlayer bonding of the composite leaf spring prepared by this process will be weak at the interface due to the resin content, and it is easy to break

[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.

Images