Abstract: The advanced pultrusion (Advanced Pultrusion, ADP)using prepreg as the raw material can realize the efficient production of truss composite members. In the advanced pultrusion process, the preforming stage is to bend the straight prepreg strip to form a specified section. In this paper, the mold is designed to complete the flat-loaded prepreg tape to form a C-shaped cross section. By establishing a deformation model, the optimal length of the mold is determined to be 1100 mm. A constraint curve is designed to effectively constrain the fiber deformation process, and the tension is proposed. The control scheme revised the model and calculated that the fiber path difference was the smallest when the height of the discharge end was 50.9375 mm, which reduced it from 2.42‰ to 1.22‰. Based on this, the C-shaped preform mold design was completed. The BA3202 curing process was studied, and the advanced pultrusion process parameters were determined to be preforming 100 ℃, hot pressing 180 ℃, and holding for 60 minutes. Based on the above, a pultrusion experiment was performed. During the experiment, there was no wrinkle accumulation on the surface of the prepreg. The bending effect of the part is good, the surface quality of the corner area is high, and the internal fiber of the part is not buckled by metallographic observation, which indicates that the process parameters are reasonable and the preforming scheme is feasible.

Key words: advanced pultrusion, C-shaped beam, pre-deformation, BA3202 prepreg, curing process, composites