Method for preparing aluminium alloy compound foil by compounding cold rolling and warm rolling

Abstract

The invention belongs to the technical field of an aluminium alloy and particularly relates to a method for preparing an aluminium alloy compound foil by compounding cold rolling and warm rolling. The method discloses by the invention comprises the following steps: firstly, respectively carrying out cold rolling on an aluminium alloy strip coil and a core aluminium alloy strip coil and annealing the aluminium alloy strip coil and the core aluminium alloy strip coil for 0.5 to 6 hours at a temperature of 300 to 450 DEG C; carrying out rolling compounding on the annealed skin alumium alloy and core aluminium alloy at a temperature of 20 to 250 DEG C to obtain an aluminium alloy composite strip; and carrying out annealing treatment on the aluminium alloy composite strip for 0.5 to 6 hours at a temperature of 300 to 450 DEG C, then carrying out multi-pass cold rolling, controlling the screw-down rate of carrying out cold rolling into the range that epsilon is more than or equal to 90 percent and less than or equal to 96 percent, carrying out annealing treatment for 0.5 to 6 hours in the temperature range of 300 to 450 DEG C after cold rolling, carrying out cold rolling again and controlling the screw-down rate of carrying out cold rolling again into the range that epsilon is more than or equal to 10 percent and less than or equal to 50 percent so as to obtain the finished aluminium alloy compound foil. According to the method disclosed by the invention, complex technical processes of ingot casting, hot-rolling cogging, assembly welding, hot-rolling compounding and the like of a conventional production process are omitted; energy is saved and consumption is reduced; and meanwhile, harmful effects brought to product quality by the hot-rolling compounding process are avoided.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, and in particular relates to a method for preparing aluminum alloy composite foils by cold and warm rolling. Background technique [0002] Condensers, evaporators, and similar heat exchangers on automobiles are composed of perforated extruded tubes and wavy fins, which are brazed by a type of aluminum alloy clad foil. Material composition, the brazing material is usually A3003 or A3203 (1.1% Mn) as the core material, and both sides are covered with brazing layer material Al-Si alloy A4343 (Si-7.5%) or A4045 (Si-10%, Mg-1.5%), usually the single-sided coverage is in the range of 8%-13%, and the total thickness of the warped clad plate is about 0.10mm-0.15mm. figure 1 . [0003] At present, the traditional production of aluminum alloy composite foil at home and abroad mostly adopts hot-rolled composite methods, that is, ingot casting, homogenization treatment, hot-rolled billeting, slab ...

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Problems solved by technology

The heating and hot-rolling composite process is carried out at high temperature, and the silicon element in the cladding layer can easily diffuse into the matrix alloy, resulting in a decrease in the high-temperature strength of the aluminum alloy composite foil, because in the process of manufacturing the heat exchanger, the aluminum alloy composite foil It needs to be heated to a high temperature of 590-620°C, which will cause the warped sheet to sag and deform at high temperature, which will affect the quality of the final product. In addition, the traditional aluminum alloy composite foil production process is long, consumes a lot of energy, and has low efficiency, which does not meet the requirements of scientific development.

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