FINAL REPORT ON RESEARCH AND DEVELOPMENT OF TITANIUM ROCKET MOTOR CASE VOLUMEⅡ – RING-ROLLING AND FLOW-TURNING CYLINDRICAL SECTIONS

摘要

Prior to this program, Pratt & Whitney Aircraft fabricated 40-inch diameter rocket motor cases from B-120 VCA titanium alloy and formed the center sections of these cases by flow-turning. Although these cylinders had adequate strength properties and satisfactory hydro test performance, dimensional control during flow-turning was inadequate to meet the required tolerances. A large amount of diametral growth and local bulging occurred during flow turning. The subject program was undertaken to develop a flow-turning practice to produce cylinders which would meet the dimensional as well as improved strength requirements.