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Heat treatment method of aluminum alloy for automotive body

A heat treatment method and technology for automobile bodies, applied in the field of aluminum alloys, can solve the problems of reduced material formability, poor flanging ductility, high Cu content, etc., and achieve high paint strength, formability, and optimization of formability

Inactive Publication Date: 2016-10-05
重庆金亚模具制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the AA6111 alloy has better bake hardenability, but its yield strength before stamping is relatively high (usually exceeding 150MPa or even higher), resulting in a decrease in the formability of the material and poor flanging ductility, and it is difficult to fully meet the forming requirements of automobile body panels. sexual demands
At the same time, the Cu content in the alloy is high, which reduces the corrosion resistance of the material.
AA6016 and AA6022 alloys are low-Cu alloys with good formability, but their bake hardenability is lower than that of AA6111 alloys.

Method used

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  • Heat treatment method of aluminum alloy for automotive body

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Experimental program
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Effect test

Embodiment 1

[0023] The composition of the aluminum alloy is calculated by mass percentage: Si 1.90 wt%, Mg 0.40 wt%, Mn 0.1 wt%, Fe0.0.12 wt%, Cu 0.10 wt%, Ti 0.08 wt%, Cr 0.07 wt%, and the balance is Al. After the aluminum alloy ingot is homogenized, it is hot-rolled and cold-rolled to a thin plate of 1 mm; the thin plate is water-quenched after solution treatment, and then pre-aged: 100°C × 10min. After two weeks of natural aging, simulate baking paint treatment (2% stretch + 175°C × 30min).

Embodiment 2

[0025] The composition of the aluminum alloy is calculated by mass percentage: Si 1.70 wt%, Mg 0.60 wt%, Mn 0.2 wt%, Fe 0.10 wt%, Cu 0.09 wt%, Ti 0.08 wt%, Cr 0.05 wt%, the balance is Al . After the aluminum alloy ingot is homogenized, it is hot-rolled and cold-rolled to a thin plate of 1 mm; the thin plate is water-quenched after solution treatment, and then pre-aged: 200 ° C × 5s. After two weeks of natural aging, simulate baking paint treatment (2% stretch + 175°C × 30min).

Embodiment 3

[0027] The composition of the aluminum alloy is calculated by mass percentage: Si 1.8 wt%, Mg 0.50 wt%, Mn 0.05 wt%, Fe0.11 wt%, Cu 0.05 wt%, Ti 0.10 wt%, Cr 0.05 wt%, and the balance is Al. After the aluminum alloy ingot is homogenized, it is hot-rolled and cold-rolled to a thin plate of 1 mm; the thin plate is water-quenched after solution treatment, and then pre-aged: 150℃×10min. After two weeks of natural aging, simulate baking paint treatment (2% stretch + 175°C × 30min).

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Abstract

The invention relates to a heat treatment method of an aluminum alloy for an automotive body. The heat treatment method comprises the following steps of: carrying out homogenizing annealing heat treatment, and then carrying out hot rolling, intermediate annealing and cold rolling machining to form sheet metal; carrying out solution treatment on the aluminum alloy sheet metal at 500-600 DEG C, carrying out rapid quenching till temperature is lower than 110 DEG C, and then carrying out pre-ageing treatment within 20 minutes, wherein according to the pre-ageing treatment process, pre-ageing is carried out for 3-10s at 150-200 DEG C, or pre-ageing is carried out for 0.3-10 hours at 50-90 DEG C. The heat treatment method comprises the following steps of: carrying out homogenizing annealing heat treatment, and then carrying out hot rolling, intermediate annealing and cold rolling machining to form sheet metal; carrying out solution treatment on the aluminum alloy sheet metal at 540-565 DEG C, carrying out rapid quenching till temperature is lower than 100 DEG C, and then carrying out pre-ageing treatment within 30 minutes, wherein according to the pre-ageing treatment process, pre-ageing is carried out for 1-10s at 180-220 DEG C, or pre-ageing is carried out for 0.2-12 hours at 60-100 DEG C. After the aluminum alloy is subjected to the pre-ageing treatment, the property of the aluminum alloy is stable in a room temperature placement process, and before baking finish, the aluminum alloy has good forming property.

Description

technical field [0001] The invention relates to a 6xxx series aluminum alloy, in particular to an aluminum alloy material used for automobile body panels, and belongs to the technical field of aluminum alloys. Background technique [0002] The lightweight of automobiles is one of the development directions of automobiles, and the aluminum alloying of automobiles is an important means of lightweighting. In recent years, the development of aluminum alloy panels for automobile bodies has been the focus of research at home and abroad, mainly focusing on the three series of 2xxx series, 5xxx series and 6xxx series. Compared with 5xxx series aluminum alloys, 6xxx series aluminum alloys have higher bake hardening performance and impact resistance; low Cu 6xxx series aluminum alloys usually have better corrosion resistance than high Cu 2xxx series aluminum alloys. Therefore, the current development trend of aluminum alloy body panels is to develop 6xxx aluminum alloys for body pane...

Claims

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Application Information

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IPC IPC(8): C22F1/043
Inventor 罗灿
Owner 重庆金亚模具制造有限公司
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