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:

1968-05-01

Pagination or Media Count:

97.0

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