Machining method of expired aluminum plate

Abstract

The invention relates to the technical field of heat treatment of aluminum alloys and discloses a machining method of an expired aluminum plate. Firstly, the expired aluminum plate is placed in a heating device and heated to 200-250 DEG C at the heating rate of 5-20 DEG C / s, and heat preservation is conducted for 0.5-3 minutes; then, the aluminum plate is taken out from the heating device within 10 seconds after heat treatment and subjected to cooling with strong wind; finally, after the aluminum plate is subjected to the heat treatment and cooling with the strong wind, punch forming of the cooled aluminum plate is completed within 2 days. According to the machining method of the expired aluminum plate, by conducting heating and cooling with the strong wind on the expired aluminum plate and then completing punch forming of the aluminum plate in time to improve the yield strength of the delivery state of the expired aluminum plate and the yield strength after painting and baking, requirements of a main engine plant for the mechanical performance of the expired aluminum plate can be met again, correspondingly rejection of the expired aluminum plate is avoided, and therefore the material cost of the main engine plant is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy heat treatment, in particular to a processing method for expired aluminum plates. Background technique [0002] Aluminum alloy is one of the key materials for automobile lightweight. Among them, the 6XXX series aluminum sheet has a low yield strength because of its low yield strength, which is beneficial to stamping. At the same time, its strength increases after stamping and baking, and can Many characteristics such as excellent dent resistance are obtained, so it is widely used in body panels. However, as an age-strengthenable alloy, the material properties of 6XXX series aluminum plate will change with the parking time. Specifically, as the parking time prolongs, the yield strength of the as-supplied state increases and the baking strength decreases. Therefore, major OEMs have set a certain shelf life for 6XXX series aluminum sheets, generally 6 months, and stipulated the performance of...

AI Technical Summary

Problems solved by technology

Therefore, for the 6XXX series aluminum plates that have been shipped to the OEM and have not yet been used, the usual practice is to recycle, smelt and remanufacture the expired 6XXX series aluminum plates as waste by the material supplier, resulting in Serious waste of materials, which greatly increases the material cost of the OEM

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