Flow forming is an advanced, net shape, cold metal forming process employed for the manufacturing of dimensionally precise, rotationally symmetrical, hollow components. Precise tubular components such as motor bodies and warheads for tactical rockets, having large length to diameter ratios, made with thin walls and requiring a high degree of dimensional accuracy are excellent flow formed parts. Titaniums, nickel-based alloys, high strength carbon steels, high fragmentation steels, Maraging Steels, high strength aluminums, and Tantalum Tungsten alloys are routinely flow formed. Internal and external features for the interface of fuzing, imbedded sensors, explosives, and propulsion are also routinely accommodated. Well known for its efficiency and economic benefits, flow forming has been widely accepted as the process of choice in the fabrication of difficult-to-manufacture, round and thin wall, military and aerospace components requiring superior metallurgical and dimensional controls. Flowforming is currently employed for the production of missile war heads, outer shells and nose cones, housings for flight and launch motors, casings for rocket motors, large caliber cartridge casings, thin wall mortar tubes, projectiles, bomb bodies; as well as tubulars for the nuclear, petrochemical and aerospace industries. Flow formed parts are formed to net shape or near net shape, eliminating machining operations and expensive material losses. A cylindrical work piece is attached to a rotating mandrel; 3 rollers hydraulically compress against the outer diameter of the preform. The desired geometry of the flow formed tube is achieved when the preform wall thickness is compressed above its yield strength and plasticized “made to flow” in the longitudinal direction onto the surface of the inner, rotating mandrel. As the preform material is thinned out and lengthened onto the mandrel, preforms are formed into seamless, thin wall, very round and concentric tubular-shaped products; with increased mechanical properties from the cold work, refined microstructure, oriented crystallographic texture and excellent surface finishes, all with repeatable accuracy.

Member Website: