Preheat treatment for improving automobile plate of 6111 aluminium alloy formation and baking paint hardening performance
A baking paint hardening and preheating treatment technology, which is applied in the field of alloy heat treatment to achieve the effect of low temperature, short time and improved strength
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Embodiment 1
[0011] The 6111 alloy ingot is homogenized at 470℃×5h+525℃×18h in a circulating air furnace, then it is cut and milled, hot-rolled and finally cold-rolled into a 1.2mm thick sheet. The thin plate is subjected to 540℃×30min solution treatment water quenching in a salt bath furnace, and after being left at room temperature for 3 days, it is heat treated in a drying oven at 185℃×12min, and then it is stretched and cupped after being left at room temperature for 2 weeks. In the test, the heat treatment of the simulated baking varnish at 170℃×30min was carried out in a drying oven.
Embodiment 2
[0013] The 6111 alloy ingot is homogenized at 470℃×5h+525℃×18h in a circulating air furnace, then it is cut and milled, hot-rolled and finally cold-rolled into a 1.2mm thick sheet. The thin plate is subjected to 540℃×30min solution treatment water quenching in a salt bath furnace, and after being left at room temperature for 6 hours, it is heat treated in a drying oven at 200℃×13min, and then it is stretched and cupped after being left at room temperature for 2 weeks. The sudden test, simulating 170℃×30min baking varnish heating treatment is carried out in the drying box.
Embodiment 3
[0015] The 6111 alloy ingot is homogenized at 470℃×5h+525℃×18h in a circulating air furnace, then it is cut and milled, hot-rolled and finally cold-rolled into a 1.2mm thick sheet. The thin plate is subjected to 540℃×30min solution treatment water quenching in a salt bath furnace, and after being left at room temperature for 5 days, it is heat treated in a drying oven at 180℃×15min, and then it is stretched and cupped after being left at room temperature for 2 weeks. In the test, the heat treatment of the simulated baking varnish at 170℃×30min was carried out in a drying oven.
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