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Scot Forge Produces Record Size Rolled Ring For New Subs The U.S. Navy, through subcon- tractor Martin Marietta, had been trying to procure a ring destined to be part of the new, advanced-de- sign stealth propulsion system for the Seawolf class submarine. The propulsion system is super silent and reportedly undetectable by cur- rent sonar systems. The ring needed — known as a propulsor cone — was to have both inner and outer diameter profiles, and would finish at just under 200-in. O.D. and 42- in. face. In mid-1994, Scot Forge installed a new fully automatic Wagner Ring Mill, reportedly one of the largest and most advanced in the world. With 450 tons of radial force (400 metric tons) and 280 tons of axial force (250 metric tons), the new ring mill, in conjunction with an in- house, 3,000-ton hydraulic open die press, had the ability to do exactly what the Navy needed. Scot Forge won the order. The company worked closely with the material supplier, Electralloy, a G.O. Carlson Co., which poured a 67-in. (170-cm) Nickel Aluminum Bronze (UNS C63200) ingot weigh- ing 50,000 lbs. (23,000 kg). The alloy—while rarely used in forgings of this size — was chosen for its strength, resistance to corrosion and damping capacity (ability to absorb sound). Rolling sequences were initially simulated using Rolltech, a soft- ware created specifically for the Scot Forge ring mill. After the ring mill was modified for the task, pro- duction took place and the result is the largest known defect-free pro- filed Nickel Aluminum Bronze ring in the world. Scot Forge, which received ISO 9002 certification in 1992, has been a leading manufac- turer of open die forgings for more than 100 years. For more information from Scot Forge Circle 151 on Reader Service Card Peterson Builders Heads Development Of New Urban Commuter Ferry Peterson Builders, Inc. of Wis- consin was chosen to receive fund- ing under the Advanced Research Projects Agency (ARPA)-sponsored program of research and develop- ment in the Maritech Near-Term Technology Applications program to develop the City Slicker high- speed urban ferry. The new ferry design will be developed in conjunc- tion with PBI's consortium part- ners Spirit Cruises of Norfolk, Va., and FBM Holdings of Cowes, Isle of Wight, U.K. PBI, Spirit and FBM will de- velop a new technology high-speed ferry for urban commuter applica- tion in protected and semi-protected waters. The new ferry design will have low wake wash characteristics, which will reduce wake-induced shoreline erosion on its route. PBI is licensed by FBM to market and construct its complete line of high-speed ferries in the U.S. The new urban ferry design, City Slicker, will not only include performance improvements to support environ- mentally friendly introduction into its service routes, but will also allow PBI to employ series production manufacturing. The series produc- tion technology and resulting pro- cess improvements will significantly improve PBI's ability to compete in both the international and domestic markets. 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BOX 3606 MORGAN CITY, LA 70381 TEL: (504)631-0511 FAX: (504) 631-2933 June, 1995 Circle 349 on Reader Service Card Circle 331 on Reader Service Card 43
