Copper-aluminum casting-rolling composite plate strip online annealing method

The invention relates to a copper-aluminum casting-rolling composite plate strip online annealing method. By means of the high-temperature short-time online annealing process, a casting-rolling combined copper-aluminum composite plate is subjected to online annealing at the annealing temperature of 420-480 DEG C and the annealing time of 5-20 min; the casting-rolling combined copper-aluminum composite plate is naturally cooled in the air after being annealed. The method is concise in working procedure and uniform in annealing; meanwhile, the length of an annealing production line is effectively shortened, the production cost is reduced, the production efficiency is improved, and an obtained copper-aluminum composite plate strip is controllable in interface layer thickness and high in combined strength. Besides, a heat insulation device is arranged between the annealing production line and a casting-rolling combination machine to conduct heat preservation on a plate strip blank, the annealing efficiency is imp