Abstract: Because of the condition of limited mould size or limited equipment travel, negative curvature cylinders is difficult to place prepreg on it. This research focus on how to expand fiber placement area on negative curvature cylinders. In order to avoid the lack of equipment travel and expand the scope of equipment operation, this article propounds a method of giving angle pressure on cylinders. This research includes modeling, parameter analysis and conclusion. Firstly, the model of inclined pressure should be established and the influencing factors are summarized and analyzed, such as the length of fiber placement head, the radius of the cylindrical surface of the negative curvature, and the angle range. Then the influence trend of the parameters and the level of influence at different placement positions is analyzed in detail. After analysis, a reasonable influencing range of pressure angle is given. Finally, according to the actual situation, the angle scheme is given and the actual fiber placement verification experiment is carried out. As a result, the effectiveness of the algorithm is verified by those experiments. This algorithm also lays a theoretical foundation for the use of angle pressure to increase the fiber placement area or avoid the lack of equipment travel in negative curvature surface placement.

Key words: fiber placement, negative curvature cylinders, angle pressure, composites