Winding is the winding of fiber bundles around a rotating mandrel. Many variations of this process have been developed, including in-line impregnation, prepreg winding, and thermoplastic winding . Since the fibers are tensioned during sintering, the fibers can only take the shortest path . This limits the orientation of the fibers, for example, the fibers will always slip off when a cone is hoop-wound because the shortest line curvature is not zero.
Characteristics of filament winding molding
Since the fibers are wound after tensioning, the fiber content in the product is high, up to 80%. Its specific strength is higher than that of Chin alloy.resulting in product strength
By changing the fiber direction, products with the same and different strengths in each direction can be obtained, which is convenient to ensure the stability of product quality.fantasyProducts with smooth inner surface and good quality can be obtained.
This method has high production efficiency and is suitable for mass production. The disadvantage is that the strength direction of the product is relatively obvious, the interlaminar shear strength is low, and the performance requirements of the machining equipment are relatively high.
Although winding is well suited for gyroscopic structures, many complex shapes can be produced, including I-beams, shells, wings, and more. But this requires special process steps and causes thickness non-uniformity when wrapping tapered parts. Core removal is another problem, which has led to many creative solutions. Including breakable molds, soluble molds and removable molds, etc. Parts are usually cured in an oven so the porosity is high and the surface finish is poor. Heat shrink wrapping or pressure during the curing process can be used. To solve this problem to some extent, winding is widely used in the manufacture of rocket hoods, tubes, pressure vessels or similar shaped products, and is one of the most productive manufacturing technologies in advanced composite materials.
In addition, in the defense industry, it can be used to manufacture missile casings, rocket motor casings, gun barrels, etc. Most of these products are reinforced with high-performance fibers, and the resin matrix is mostly epoxy resin. In the civilian industry, the cheap alkali-free glass roving is used, the base resin is unsaturated polyester instead of epoxy resin, and the winding equipment is simplified to facilitate high-speed production. Especially in the domestic anti-corrosion field, this molding method is mainly used to produce pipes, containers, storage tanks and other products, which can be used in oil fields, oil refineries and chemical plants.
Winding is the winding of fiber bundles around a rotating mandrel. Many variations of this process have been developed, including in-line impregnation, prepreg winding, and thermoplastic winding . Since the fibers are tensioned during sintering, the fibers can only take the shortest path . This limits the orientation of the fibers, for example, the fibers will always slip off when a cone is hoop-wound because the shortest line curvature is not zero.