A kind of three-dimensional braided composite automobile leaf spring and its preparation method

Abstract

The invention discloses a three-dimensional braided composite material automobile leaf spring and a preparation method thereof. The three-dimensional braided composite material leaf spring of the present invention is composed of mixed fibers to form a three-dimensional fabric structure. By adjusting the fiber material, the amount of tow and the fabric structure, the plate The important parts of the spring have high strength, fatigue stiffness and long service life. At the same time, with the resin vacuum transfer molding technology, the special composite resin is evenly impregnated and cured, and a light weight, strong fatigue resistance, high strength and rigidity can be obtained. Large, dimensional stability, and long service life of three-dimensional structure composite material truck leaf springs to overcome the problem of interlayer failure of ordinary two-dimensional laminated structure composite material leaf springs under fatigue loading.

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