Short-process production process of cast-roll

Using the casting and rolling billet structure refinement treatment technology and the "three-step rolling method" online surface treatment - rolling composite - diffusion annealing treatment,Achieve metallurgical bonding of multilayer material interfaces and achieve uniform coverage. Through reasonable design of processing rate and optimization of annealing process, the composite aluminum foil has good sag resistance and good corrosion resistance. It solves the problem that the casting-rolling method cannot be used instead of the hot-rolling method to produce Brazing cladding aluminium Foil in the industry, and breaks through the long-term bottleneck of long production cycle and low yield of brazing composite foil produced by the hot-rolling method. The production cost of Brazing cladding aluminium Foil is greatly reduced, energy saving and consumption reduction are obvious, and the market application prospect of cold-rolled composite foil is broad.
 
With the continuous increase of car ownership and the continuous expansion of application fields, the global demand for aluminum alloys and aluminum alloy composite materials for brazed heat exchangers is increasing year by year. At present, this kind of composite material is mostly prepared by hot rolling composite method at home and abroad. Due to the hot rolling composite, the thick slab produced by semi-continuous casting and rolling needs to be sawed, milled and hot rolled into composite billets and then rolled into finished products. , the whole process cycle is long, the efficiency is low, the energy consumption is high, and the yield loss is large. At the same time, the hot rolling compound faces the disadvantages of large overall equipment investment and high cost, which makes the product processing cost high. The produced Brazing cladding aluminium Foil cladding layer has poor uniformity in the head, tail and width directions, which affects the quality and stability of brazing for downstream customers, resulting in post-weld shrinkage or lodging, fin melting, virtual welding and missing welding etc defect.
 
In recent years, there have been studies on the short-flow green production process of "casting-rolling + cold-rolling composite method", and the joint enterprise has successfully applied it to high-precision narrow-width (within 800 mm) dissimilar metal composite rolling [2], but The technology of applying this process to the production of wide-width (800-1 600 mm) Brazing cladding aluminium Foil has not been disclosed. It is developed to solve the above shortcomings of the hot-rolled composite method, and at the same time, it can ensure that the key characteristic indicators of the brazed composite aluminum foil product are not lower than the hot-rolled composite production capacity.