Mold pressing forming process of long glass fiber reinforced resin bow arm

Abstract

The invention discloses a mold pressing forming process of a long glass fiber reinforced resin bow arm. The mold pressing forming process sequentially comprises the procedures of gum dipping, extruding, mold pressing, cooling curing and workpiece tempering. In gum dipping, a long glass fiber bundle is drawn into resin to be pre-soaked. In extruding, residual resin is extruded out of the glass fiber bundle subjected to gum dipping treatment and resin pre-soaking by a drawing machine through an extrusion opening. In mold pressing, dipped glass fibers subjected to extruding treatment are formed by a mold pressing machine at the medium pressure of a mold cavity. In cooling, a glass steel product subjected to mold pressing forming is blown by a cold air gun, cooling is carried out for one minute, and demolding is facilitated. In workpiece tempering, a cooled workpiece is put in a drying box of 130+ / -5 DEG C for 120 min to 150 min to be tempered, and the resin in the bow arm is fully cured.The glass filter content of the bow arm obtained through the forming process reaches up to 75%, the mechanical strength of the bow arm can be effectively improved, the bendable radian of the bow arm is improved, surface cutting does not need to be carried out on the bow arm any more, and the situation that the glass fibers are cut off to influence the mechanical property of the bow arm is avoided.

Description

technical field [0001] The invention relates to the technical field of composite material manufacturing, in particular to a molding process of a long glass fiber reinforced resin bow arm. Background technique [0002] At present, the production of FRP products on the market is the most commonly used pultrusion process or compression molding process. The pultrusion molding process includes: dipping, extrusion molding, heating and curing, and cutting to length. However, this method still has many shortcomings: the product has a single shape, can only produce fixed-section products, and the bendable radian is relatively small. The products made by the pultrusion process often need to be post-processed as bow arms, resulting in some glass fibers being cut off and weakening the bow arms. mechanical properties. Compression molding (also known as compression molding or compression molding) is a process in which powder, granular or fibrous plastics are first put into a mold cavity...

AI Technical Summary

Problems solved by technology

However, this method still has many disadvantages: the shape of the product is single, and only products with fixed cross-section can be produced, and the bendable arc is relatively small. The product of the pultrusion process is often used as the bow arm after post-processing, resulting in part of the glass fiber being cut off and weakening the bow arm. mechanical properties

With the development of science and technology, the current molding process has progressed to prepreg molding, using the layer laying method to fill the cavity with prepreg and then molding, the production cycle is longer; in addition, in the production process, the common molding process uses Most of the fiber materials are woven fibers, the fiber distribution is criss-cross, and the fiber content of the product is relatively low (generally only 50% to 60%), so the strength cannot meet the requirements of the bow arm. If good fiber is used Materials (such as carbon fiber) are molded, although good strength and rigidity can be obtained, but the bendable radian and toughness are not up to the requirements of use

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