アルミニウム合金A7075の縦型双ロールキャスティング

抄録

This paper reports on vertical twin roll casting of aluminum alloy A7075. Aluminum alloy A7075 belongs to the highest strength alloys, and sheet is produced by rolling and extrusion. It is used in the aerospace industry and for special applications, but sheet is not readily available due to its high susceptibility to solidification cracking. Since twin roll casting can produce thin sheets directly from molten metal, it is possible to produce plate materials other than conventional alloys for sheet. In this study, thin sheets were produced using copper rolls, which have higher thermal conductivity than the iron rolls used in the previous study. The objective of this study was to use copper rolls with higher thermal conductivity to solidify the material faster and produce good thin sheets. The effects of roll peripheral speed and roll material on plate continuity, surface properties, and thickness were investigated. Experiments were conducted using iron rolls under five conditions of roll peripheral speeds of 1, 3, 5, 7, and 10 m/min and copper rolls under three conditions of roll peripheral speeds of 5, 7, and 10 m/min. In this experiment, thinning was possible under all conditions except 1 m/min with iron rolls, and thinning of aluminum alloy A7075 by vertical twin roll casting was possible.