A kind of preparation method of aluminum alloy for heat dissipation of automobile exhaust system

Abstract

The invention provides a preparation method of an aluminum alloy for heat dissipation of a vehicle exhaust system. The preparation method comprises the following steps of S1, smelting and casting a raw material to obtain a casting ingot; S2, conducting milling on the casting ingot; S3, conducting homogenizing heat treatment on the casting ingot; S4, conducting hot rolling on the casting ingot to form a blank; S5, conducting hot rolling on the blank to reach the thickness of a finished product; S6, conducting heat treatment on the finished product; and S7, conducting stretch bending straightening and back-rolling. Through the composition proportion and the process method, waste materials, especially waste ring-pull cans, can be utilized to the maximum extent; the production cost is reduced;and a green and sustainable developing aluminum product application industrial chain is created. The work hardening degree of the material is remarkably reduced in performance, and the rolling capacity is reduced by 30% or more under the condition of the equal working rate. Accordingly, a great deal of electric energy is saved during the mass-production process, and the punching cracking probability is reduced. During the production process and the punching process, the specific Luders band process defect of high-magnesium alloy cannot occur, and the aesthetic degree of the material is substantially improved.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy preparation, and more specifically relates to a method for preparing an aluminum alloy for heat dissipation of an automobile exhaust system. Background technique [0002] At present, the heat dissipation materials used in exhaust systems in the automotive industry are mainly high-strength 5-series aluminum alloys. The chemical composition of 5-series aluminum alloys needs to strictly control the content of iron and silicon impurity elements. Taking the commonly used 5182 alloy as an example, the content of iron elements is controlled at 0.15% or less, and silicon content is controlled below 0.2%. Therefore, in the process of smelting and casting, recycled aluminum and conventional waste cannot be used (recycled aluminum and conventional waste ferrosilicon have high impurities), and only electrolytic aluminum ingots (primary aluminum) plus intermediate Alloys are produced in the form of high...

AI Technical Summary

Problems solved by technology

[0006] Due to the large stamping range of the finished product, it is easy to cause stamping cracks. Some aluminum manufacturers treat the surface and apply lubricating oil. It is difficult and costly to clean the lubricating oil in the later stage.

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