Explanation

The invention relates to a forming method for continuously manufacturing fiber composite materials profiles, which utilizes the characteristics of resin hot-melt viscosity, fiber continuity, relaxation compressibility, etc. The typical pultrusion process process consists of yarn feeding, glue dipping, preforming, assimilation molding, traction and cutting processes. After the continuous fiber or fabric is impregnated with resin, it is pulled through the forming cavity with cross section shape, extrusion, heated and curing. Under the pulling force of the pulling mechanism, it is pulled out continuously to pull out the infinitely long profile products, and then cut the profile according to the length requirements with a cutting machine. The equipment used is a pultrusion molding machine, which is composed of a yarn frame, a yarn collector, a dipping device, a molding cavity, a traction mechanism, a cutting mechanism, and an operation control system. reinforcement can take many forms, such as unidirectional fibers, braided sleeves or integral three-dimensional braids. The mouth shape of the mold cavity can be designed into various shapes according to the cross-sectional shape of the profile, such as I-shaped, groove shaped, or J-shaped. This method requires that resin has low viscosity, good wettability, long pot life and fast curing. External releasing agent (internal releasing agent) can be added to resin to automatically transfer to the part surface during molding to reduce traction resistance. curing can be carried out in sections. First, curing in the mold cavity to a certain extent? Then enter the intermediate furnace for complete curing. Traction is carried out continuously and intermittently, depending on curing time and production efficiency. The method has continuous production process, high efficiency, highly automated production, high fiber content of parts, high utilization rate of raw materials, and is suitable for the continuous production of large batch of tube, profiled profiles and bar; However, the cross-section of the product is limited, and products with curved shapes are not easy to form, and the product performance has distinct directionality.

Classification