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Manufacturing method of high-strength 6008 alloy extruded profile and extruded profile

A technology for extruding profiles and a manufacturing method, applied in the field of aluminum profiles, can solve the problems of low elongation, low extrusion efficiency, and high defect rate, and achieve the effects of improving extrudability and strength

Active Publication Date: 2022-07-22
广东金协成铝业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such a high silicon-magnesium content is only suitable for the manufacture of castings, not for the manufacture of extrusions, because such a high silicon-magnesium content will make it extremely difficult to extrude profiles with high aspect ratios, and the extrusion efficiency is low. The elongation of the material is less than 10%, and the defective rate is high

Method used

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  • Manufacturing method of high-strength 6008 alloy extruded profile and extruded profile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Add the AL99.70 aluminum ingot to the aluminum melting and casting furnace for heating and smelting. When the temperature reaches 740°C, add the aluminum-silicon master alloy and magnesium ingot, stir evenly and after the temperature reaches 760°C, add the aluminum-vanadium master alloy and stir until the mixture is uniform.

[0057] Refining at 740°C yields a molten alloy. The molten alloy contains 0.70 wt % of silicon element, 0.65 wt % of magnesium element and 0.12 wt % of vanadium element, and the balance is aluminum.

[0058] Using molten alloy to cast Φ228 round cast rod at 740℃, Al-Ti-B wire was added online during the casting process.

[0059] The round cast rods were held at 450°C for 10 hours.

[0060] Load the round cast rod into the extruder, and use a Φ450*320mm multi-cavity split die to extrude the profile, where the extrusion coefficient is 18.5, the extrusion temperature is 545°C, the width-thickness ratio is 15.9, and the extrusion speed is 8 m / min. I...

Embodiment 2

[0063] Add the AL99.70 aluminum ingot to the aluminum melting and casting furnace for heating and smelting. When the temperature reaches 740°C, add the aluminum-silicon master alloy and magnesium ingot, stir evenly and after the temperature reaches 760°C, add the aluminum-vanadium master alloy and stir until the mixture is uniform.

[0064] Refining at 735°C yields a molten alloy. The molten alloy contains 0.68 wt % of silicon element, 0.64 wt % of magnesium element, 0.12 wt % of vanadium element, 0.20 wt % of copper element, and the balance is aluminum.

[0065] Using molten alloy to cast Φ228 round cast rod at 735℃, Al-Ti-B wire was added online during the casting process.

[0066] The round cast rods were held at 520°C for 2.5 hours.

[0067] The round cast rod is loaded into the extruder, and the profile is extruded using a Φ450*320mm multi-cavity split die. The extrusion coefficient is 18.5, the extrusion temperature is 540°C, the width-thickness ratio is 15.9, and the e...

Embodiment 3

[0070] Add the AL99.70 aluminum ingot to the aluminum melting and casting furnace for heating and smelting. When the temperature reaches 740°C, add the aluminum-silicon master alloy and magnesium ingot, stir evenly and after the temperature reaches 760°C, add the aluminum-vanadium master alloy and stir until the mixture is uniform.

[0071] Refining at 750°C yields a molten alloy. The molten alloy contains 0.65 wt % of silicon element, 0.60 wt % of magnesium element, 0.15 wt % of vanadium element, and the balance is aluminum.

[0072] Using molten alloy to cast Φ228 round cast rod at 750℃, Al-Ti-B wire was added online during the casting process.

[0073] The round cast rods were incubated at 500°C for 6 hours.

[0074] The round cast rod is loaded into the extruder, and the profile is extruded using a Φ450*320mm multi-cavity split die, where the extrusion coefficient is 18.5, the extrusion temperature is 520°C, the width-thickness ratio is 15.9, and the extrusion speed is 12...

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Abstract

The invention discloses a high-strength 6008 alloy extruded profile manufacturing method and an extruded profile, and belongs to the field of aluminum sections.The method comprises the steps that molten alloy is refined, and the alloy comprises 0.65%-0.70% of silicon and 0.60%-0.65% of magnesium; then casting into a round casting rod, and adding an aluminum-titanium-boron wire on line in the casting process; after heat preservation, the round casting rod is loaded into an extruding machine, the extruding temperature is 520-545 DEG C, and the discharged profile is air-cooled to the room temperature; and carrying out overaging treatment to obtain the extruded profile. According to the formula, the low total amount of silicon and magnesium is adopted, excessive silicon is properly kept, the extrudability of the profile with the high width-to-thickness ratio can be improved, the extrusion temperature of 520-545 DEG C and the online air-blast quenching and overaging technology are adopted, the high-yield-strength profile with the yield ratio larger than or equal to 0.90 can be produced, the requirement that the non-proportional extension strength RP0.2 is larger than or equal to 260 N / mm < 2 > is met, it is guaranteed that the elongation is larger than or equal to 10%, and the product quality is improved. And the high-strength aluminum alloy multi-cavity thin-wall structural part can be manufactured.

Description

technical field [0001] The invention relates to a manufacturing method of a high-strength 6008 alloy extruded profile and an extruded profile, belonging to the field of aluminum profiles. Background technique [0002] The 6-series aluminum alloy contains magnesium and silicon. Among them, 6008 aluminum alloy has the advantages of light weight, high strength and corrosion resistance. At present, almost all new energy vehicles use aluminum profiles made of 6008 aluminum alloy. In domestic and foreign standards, 6008 aluminum alloy requires tensile strength Rm≥255N / mm under normal state T6 2 , specifying the non-proportional elongation strength R P0.2 ≥215N / mm 2 , elongation ≥ 8%, Brinell hardness ≥ 85. [0003] However, foreign buyers have higher requirements on the strength of 6008 aluminum alloy. In the application of foreign auto parts, most of them require non-proportional elongation strength R P0.2 ≥260N / mm 2 . If this non-proportional elongation strength profile i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/00C22C21/02C22C1/03C22F1/043C22F1/05
CPCB21C23/002C22C21/02C22C1/026C22C1/03C22F1/043C22F1/05C22F1/002
Inventor 吴泽成李恢荣邓锡会李煜全吴静恒
Owner 广东金协成铝业有限公司
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