Introduction of the Apparatus on the 'Super Metal Technology' Project for Aluminum 2. Cryogenic Rolling Equipment and Warm Rolling Equipment

摘要

This paper introduces the test rolling equipments for cryogenic rolling and warm rolling installed to develop the aluminum alloy sheets with the fine grain structures that are the target of the "Super Metal Technology" project. The rolling equipment has the work rolls of PHI 56, PHI 100, PHI 156, PHI 260mm and backup rolls of PHI 260mm in diameters. This equipment can roll the aluminum alloy sheets or coils up to 200mm in width at 3.3m/s (=200m/min) of maximum speed. The cryogenic rolling was carried out after the sheet was cooled in the tank filled with liquid nitrogen. For example, when the 3004 aluminum alloy coil of lmm in thickness and 60mm in width was rolled into 20 percent reduction at the rolling speed of 0.17m/s (= l0m/min) for 280s, the coil temperature reached about - 45 deg C at the outlet of the roll after rolling. On the other hand, the warm rolling system was developed targeting constant temperature control of aluminum sheets during rolling. The warm rolling was carried out with the 2-high mills of PHI 260mm in diameter. Eight cartridge heaters were embedded along the drive side direction from the work side of mill in those rolls. The surface temperature of the upper and lower rolls can he controlled independently. The surface temperature can be raised up to around 400 deg C at about 100 deg C/h of heating rate. For example, when the 5083 sheet of 200mm in width was warm rolled from l0mm to lmm thick at 200 deg C. the surface temperatures of the rolls were no change at about 220 deg C. Therefore this warm rolling equipment was rolled at the uniform temperature, however the sheet thickness is thin.