Manufacturing method of aluminum alloy three-layer composite material for brazing

The invention belongs to the aluminum alloy manufacturing technology field and relates to a manufacturing method of an aluminum alloy three-layer composite material for brazing. The method mainly comprises the steps of component proportioning of a brazing layer, fusion casting, saw cutting, surface milling, hot rolling, proportioning of a base body layer, fusion casting, saw cutting, surface milling, surface treatment of the two, seaming assembling, heating, hot rough rolling compounding, hot finish rolling, cold rolling, withdrawal and straightening cleaning, finished product annealing, slitting and packaging. Through a component optimization design, strength of a composite material and anti-sagging performance after high-temperature brazing can be improved, meanwhile, balance between mechanical performance and corrosion performance is guaranteed, and a brazing requirement of controllable gas shielded welding can be well satisfied. A two-stage heating mode of homogenizing heat treatment and hot rolling heating is performed at the same time after a brazing material and a matrix cast ingot are combined so that production efficiency can be greatly improved, energy consumption is reduced and product performance requirements are satisfied.