Spin-forming Project Report

Technical Report · Fri Mar 20 04:00:00 EDT 2009

DOI:https://doi.org/10.2172/952564· OSTI ID:952564

Switzner, Nathan; Henry, Dick

In a second development order, spin-forming equipment was again evaluated using the test shape, a hemispherical shell. In this second development order, pure vanadium and alloy titanium (Ti-6Al-4V) were spin-formed, as well as additional copper and 21-6-9 stainless. In the first development order the following materials had been spin-formed: copper (alloy C11000 ETP), 6061 aluminum, 304L stainless steel, 21-6-9 stainless steel, and tantalum-2.5% tungsten. Significant challenges included properly adjusting the rotations-per-minute (RPM), cracking at un-beveled edges and laser marks, redressing of notches, surface cracking, non-uniform temperature evolution in the titanium, and cracking of the tailstock. Lessons learned were that 300 RPM worked better than 600 RPM for most materials (at the feed rate of 800 mm/min); beveling the edges to lower the stress reduces edge cracking; notches, laser marks, or edge defects in the preform doom the process to cracking and failure; coolant is required for vanadium spin-forming; increasing the number of passes to nine or more eliminates surface cracking for vanadium; titanium develops a hot zone in front of the rollers; and the tailstock should be redesigned to eliminate the cylindrical stress concentrator in the center.

• Research Organization: Kansas City Plant (KCP), Kansas City, MO
• Sponsoring Organization: USDOE National Nuclear Security Administration (NA)
• DOE Contract Number: AC04-01AL66850
• OSTI ID: 952564
• Report Number(s): KCP-613-8550
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
ALUMINIUM
CONCENTRATORS
COOLANTS
COPPER
DEFECTS
LASERS
SHAPE
STAINLESS STEELS
TITANIUM
TUNGSTEN
VANADIUM