Method for compounding aluminum alloy composite board used for machining automobile oil cooler bottom board

Abstract

The invention relates to a method for compounding an aluminum alloy composite board used for machining an automobile oil cooler bottom board. A 3003 aluminum alloy board, a 6A02 aluminum alloy cast ingot and a 3003 aluminum alloy board are hot-rolled and compounded according to the thickness proportion of 1:(8-15):1, so that the three-layer aluminum alloy composite board is obtained. By the adoption of the aluminum alloy composite board manufactured through the method, the situation that the welding quality of an oil cooler is affected due to the Mg element in a 6A02 core material of the aluminum alloy composite board in the protective atmosphere brazing process is avoided, protective atmosphere brazing of an oil cooler assembling piece can be smoothly finished, the production efficiency of the oil cooler is greatly improved, and the production cost is reduced.

Description

technical field [0001] The invention mainly relates to a composite method of an aluminum alloy composite board, in particular to a composite method of an aluminum alloy composite board used for processing the bottom plate of an automobile oil cooler. Background technique [0002] The oil cooler is an important part of the car body and an important part to ensure the safe operation of the car engine and its life. An aluminum alloy overall welded structure formed by connecting the fins to the bottom plate. Its main production process is brazing one-time forming. Aluminum alloy composite sheet is light in weight, good in corrosion resistance, good in brazing, and reliable in performance, so it is widely used in automobile cooling systems. [0003] After the oil cooler is brazed in a high-temperature brazing furnace, the welding of each part of the components should be firm, and each component should not be deformed at high temperature, otherwise it will cause virtual welding ...

AI Technical Summary

Problems solved by technology

However, since the 6A02 aluminum alloy sheet contains 0.45-0.9% Mg element, the Mg element will form Mg vapor during the protective atmosphere brazing process, and the O in the furnace body 2 , CO 2 , N 2 After the reaction, a black reaction product is generated on the surface of the part, which seriously affects the surface quality of the part, and the flux has a certain limit on the dissolution of MgO on the surface of the part

In addition, Mg and MgO react with flux to form MgF 2 , so that the melting point of the brazing flux increases and loses its activity, which seriously affects the brazing quality, so that the 6A02 aluminum alloy plate cannot be brazed in a protective atmosphere when it is used as the bottom plate of the oil cooler, and only vacuum brazing can be used to weld the assembled oil cooler. parts, reducing the production efficiency of the oil cooler and increasing the production cost

Images