Accession Number : AD0835224

Title :   A PRODUCTION PROCESS FOR LARGE SOLID MOTOR CASES, INTERNAL ROLL-EXTRUDED.

Descriptive Note : Final technical rept. 1 Oct 65-31 Mar 68,

Corporate Author : UNITED TECHNOLOGY CENTER SUNNYVALE CA

Personal Author(s) : Gott, Jerome E. ; Lynch, John M.

Report Date : MAY 1968

Pagination or Media Count : 97

Abstract : The purpose of the program was to establish the internal roll-extrusion process and demonstrate the advantages of this technique for fabrication of one-piece large-diameter SRM motor cases. It was also intended to evaluate the response of two steel alloys (D6aC and HP 9-4) to this process. Each alloy required subscale evaluation prior to full-scale fabrication. The HP 9-4 subscale study required determination of welding parameters and roll-extrusion of a 120-in.-diameter ring. The full-scale diameter ring of heat treated 2-in.-thick plate, roll-extruding it in three cold reduction passes to a 135-in.-high 120-in.-diameter cylinder, machining the end joints, and hydrotesting it at 975 psig. The D6aC subscale study used two 120-in.-diameter forged rings to establish roll-extruding parameters. The full-scale study, using those parameters and two 44-in.-high forged rings, roll-extruded two full-length 120-in.-diameter cylinders to 135-in. height in seven and five passes each, machined the end joints, and hydrotested these completed SRM cases to 975 psig. (Author)

Descriptors :   *ROLLING(METALLURGY)), (*ROCKET ENGINE CASES, SOLID PROPELLANT ROCKET ENGINES, STEEL, EXTRUSION, WELDING, RINGS, MANUFACTURING.

Subject Categories : Fabrication Metallurgy
      Solid Propellant Rocket Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE