RESEARCH ON INTEGRATED FORMING PROCESS OF THREE-ROLL REDUCING AND THICKENING OF NECKING SECTION FOR THIN-WALLED TUBE OF ALUMINUM ALLOY 2A12.

Aircraft joystick pipe is the key part of aircraft hard control system. In this paper, a hollow necking rod pipe made of aluminum alloy 2A12 is taken as the research object. The tapered roller with extrusion cone on one side of the roller surface is designed. Simufact. Forming14.0 was used to analyze. It was found that the radial rolling force at the end of the thickening section in the second pass increased sharply. At this time, the retaining part inhibited the axial extension of the metal and realized the accumulation in the thickness direction. The thickening rate and effect were favorable at 120 rpm, which provide a theoretical basis to realize integrated forming of aeronautical thin-walled aluminum alloy tube. [ABSTRACT FROM AUTHOR]