Preheating method for improving bake-hardening performance and forming performance of 6022 aluminum alloy

Abstract

The invention provides a preheating method for improving the bake-hardening performance and the forming performance of a 6022 aluminum alloy, comprising the following steps: performing solution treatment on the 6022 aluminum alloy sheet for 10-20 min at the temperature of 530-555 DEG C, and performing water quenching; and preheating the aluminum alloy sheet after water quenching within one day for 20-60s at the temperature of 180-250 DEG C by implementing the preheating process, the bake-hardening performance of the 6022 aluminum alloy can be obviously improved, and the forming performance of the 6022 aluminum alloy can be improved to some extent at the same time.

Description

technical field

[0001] The invention relates to a preheating process for improving the baking hardenability and formability of 6022 aluminum alloy, which belongs to the technical field of aluminum alloy heat treatment. Background technique

[0002] The 6xxx series alloys that can be strengthened by heat treatment have good formability in the solid solution state (T4 state) and high strength in the baking paint state (T8 state), and there is no problem that affects the surface quality during the stamping process of the 5xxx series aluminum alloys. Lüders strips are thus considered to be the most promising alloys for use in automotive body panels.

[0003] In the production process of aluminum alloy automobile body panels, due to transportation and storage, the panels after solution treatment need to be placed at room temperature for a period of time before they can be stamped and baked in the auto parts production plant. The natural aging phenomenon produced by the plate pla...

Examples

Embodiment 1

[0016] The 6022 aluminum alloy sheet was solid-dissolved at 530°C for 20 minutes, and then quenched in water. After standing at room temperature for 1 day, carry out pre-aging treatment: the treatment temperature is 180°C, the time is 60 seconds, and then after standing at room temperature for 1 month, carry out simulated stamping and baking paint treatment (2% pre-deformation + 175°C×30min heat treatment ).

Embodiment 2

[0018] The 6022 aluminum alloy sheet was solid-dissolved at 550°C for 10 minutes and quenched in water. After standing at room temperature for 20 hours, carry out pre-aging treatment: the treatment temperature is 250 ° C, the time is 20 seconds, and then after standing at room temperature for 1 month, carry out simulated stamping and baking paint treatment (2% pre-deformation + 175 ° C × 30 min heat treatment).

Embodiment 3

[0020] The 6022 aluminum alloy sheet was solid-dissolved at 555°C for 15 minutes, and then quenched in water. After standing at room temperature for 5 hours, carry out pre-aging treatment: the treatment temperature is 200°C, the time is 30 seconds, and then after standing at room temperature for 1 month, carry out simulated stamping and baking paint treatment (2% pre-deformation + 175°C×30min heat treatment).

technical field

[0001] The invention relates to a preheating process for improving the baking hardenability and formability of 6022 aluminum alloy, which belongs to the technical field of aluminum alloy heat treatment. Background technique

[0002] The 6xxx series alloys that can be strengthened by heat treatment have good formability in the solid solution state (T4 state) and high strength in the baking paint state (T8 state), and there is no problem that affects the surface quality during the stamping process of the 5xxx series aluminum alloys. Lüders strips are thus considered to be the most promising alloys for use in automotive body panels.

[0003] In the production process of aluminum alloy automobile body panels, due to transportation and storage, the panels after solution treatment need to be placed at room temperature for a period of time before they can be stamped and baked in the auto parts production plant. The natural aging phenomenon produced by the plate pla...

Examples

Embodiment 1

[0016] The 6022 aluminum alloy sheet was solid-dissolved at 530°C for 20 minutes, and then quenched in water. After standing at room temperature for 1 day, carry out pre-aging treatment: the treatment temperature is 180°C, the time is 60 seconds, and then after standing at room temperature for 1 month, carry out simulated stamping and baking paint treatment (2% pre-deformation + 175°C×30min heat treatment ).

Embodiment 2

[0018] The 6022 aluminum alloy sheet was solid-dissolved at 550°C for 10 minutes and quenched in water. After standing at room temperature for 20 hours, carry out pre-aging treatment: the treatment temperature is 250 ° C, the time is 20 seconds, and then after standing at room temperature for 1 month, carry out simulated stamping and baking paint treatment (2% pre-deformation + 175 ° C × 30 min heat treatment).

Embodiment 3

[0020] The 6022 aluminum alloy sheet was solid-dissolved at 555°C for 15 minutes, and then quenched in water. After standing at room temperature for 5 hours, carry out pre-aging treatment: the treatment temperature is 200°C, the time is 30 seconds, and then after standing at room temperature for 1 month, carry out simulated stamping and baking paint treatment (2% pre-deformation + 175°C×30min heat treatment).

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