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DEEP DRAWN AUSFORMING DEVELOPMENT PROGRAM. 12-IN. DIA. ROCKET MOTOR CHAMBERS
LYON INC DETROIT MICH
Some preliminary dry runs were made to determine the length of time available for transporting the hot austenitic chamber to the press for forming. These tests were performed with an obsolete 1330 steel case of the same geometry and size. The case was austenitized at 1700 F for 15 min, reduced to 1600 F in the bath and held at 1600 F for 10 minutes. The case was then withdrawn from the bath and allowed to cool in air. Approximately three min were required for the thinnest portion of the case to cool from 1600 to 1000 F. This is about twice the estimated time required for transporting to the press. For proper temperature, the die assembly has been divided into separate zones, each with its heating units, thermocouples, and control systems. The wiring and control layout are presented in drawing D20070-B. Both the heading punch and the ironing punch are heated by the use of modified immersion type heaters located in the inner cavities. The remaining components are heated by the use of cartridge type heating elements distributed about their circumferences. Author