Preparation method and brazing method of aluminum alloy brazing composite board capable of being subjected to aging strengthening

Abstract

The invention relates to a preparation method and brazing method of an aluminum alloy brazing composite board capable of being subjected to aging strengthening. The preparation method comprises the following steps of sequentially overlapping and pre-preparing a first aluminum alloy plate, a second aluminum alloy plate, a third aluminum alloy plate and a fourth aluminum alloy plate, heating a pre-prepared composite board blank to 490-520 DEG C; keeping the temperature for 2 to 4 hours to obtain a rough blank with the thickness of 30 to 35mm; continuously rolling the hot rough blank on a (1 + 4)hot continuous rolling mill at a time to obtain a hot-rolled coil with the thickness of 3-5mm; carrying out cold rolling on the hot-rolled coil to obtain a cold-rolled coil with the thickness of 1-2mm; and completely annealing the cold-rolled coil in an O state to obtain an aluminum alloy brazing composite plate finished product, and after brazing, carrying out quenching and low-temperature agingstrengthening so that the overall post-welding strength of the material can be obviously improved. According to the preparation method, the strength of the aluminum alloy brazing composite plate obtained through the method after brazing is greatly improved, even compounding is achieved, the material performance after compounding is even and consistent, meanwhile, the material machining process issimplified by reducing the thickness of a hot-rolled blank, and the batch production efficiency is improved.

Description

technical field [0001] The invention relates to a preparation method and a brazing method of an aging-strengthened aluminum alloy brazing composite plate, belonging to the field of aluminum alloy plate preparation. Background technique [0002] Aluminum alloy brazing composite plate is the base material for various heat exchangers, rail transit, new energy vehicles, building curtain walls, ships and ships, aerospace, national defense and military industry, mechanical equipment, etc. It is light in weight, easy to process, and easy to realize automatic production. Good manufacturing and formability, moderate strength and so on. [0003] Generally, the existing aluminum alloy brazing composite plate materials use 3003 or its improved 3-series non-reinforceable aluminum alloy as the core material, and 4-series alloy as the brazing skin material, and the structure is composited by two or three layers of aluminum alloy materials. Among them, the 4-series aluminum alloy can be us...

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Problems solved by technology

[0004] The existing aluminum alloy brazing composite plate material is to use a single-stand hot rolling mill to heat-roll the pre-assembled composite billet to a 6-7mm thick hot-rolled coil, and then process it to the required 1-2mm finished product through cold rolling Thickness, large temperature difference between the head and the tail of the hot-rolled coil, poor uniformity of the material, and low strength after use

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