The invention discloses a 6-series aluminum alloy profile for an automobile bumper and a preparation method thereof, and relates to the technical field of wrought aluminum alloy smelting extrusion forming. Raw materials comprise, by weight, 0.4%-0.6% of Si, 0.6%-0.8% of Mg, Cu with the weight ratio smaller than or equal to 0.2%, Fe with the weight ratio smaller than or equal to 0.2%, 0.4%-0.6% of Mn, Cr with the weight ratio smaller than or equal to 0.2%, Zn with the weight ratio smaller than or equal to 0.10%, Ti with the weight ratio smaller than or equal to 0.30%, V with the weight ratio smaller than or equal to 0.10% and the balance being Al and other inevitable impurities, the other inevitable impurities are smaller than or equal to 0.05%, and the total amount of the other inevitable impurities is smaller than or equal to 0.15%. According to the method, a trace amount of Mn, Cr and Cu elements are added into the aluminum alloy, the specific Mg: Si ratio is designed, and meanwhile, the specific procedures of smelting, casting, homogenizing annealing, extrusion, online quenching, straightening, artificial aging and the like are combined, so that the material still has the extremely low deformation cracking tendency on the premise that the good mechanical property is guaranteed, and the good thermal stability performance is achieved. Due to the excellent comprehensive performance, the material is particularly suitable for manufacturing automobile bumper energy absorption boxes and cross beams.

    本发明公开了一种汽车保险杠用6系铝合金型材及制备方法,涉及变形铝合金熔炼挤压成型技术领域。原料中各组分的重量百分比为:Si:0.4‑0.6%,Mg:0.6‑0.8%,Cu:≤0.2%,Fe:≤0.2%,Mn:0.4‑0.6%,Cr:≤0.2%,Zn:≤0.10%,Ti:≤0.30%,V:≤0.10%,余量为Al和不可避免的其它杂质,不可避免的其它杂质单个≤0.05%,总量≤0.15%。该方法通过在铝合金中微量添加Mn、Cr、Cu元素和设计特定的Mg:Si比例,同时结合特定的熔炼、铸造、均匀化退火、挤压、在线淬火、调直、人工时效等工序,使得材料在保证良好力学性能前提下仍具有极底的变形开裂倾向,同时还具备很好的热稳定性性能。优异的综合性能表现使得该材料特别适用于制造汽车保险杠吸能盒和横梁。


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    Title :

    6-series aluminum alloy profile for automobile bumper and preparation method thereof


    Additional title:

    一种汽车保险杠用6系铝合金型材及制备方法


    Contributors:
    ZHANG QI (author)

    Publication date :

    2022-02-01


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    C22C Legierungen , ALLOYS / B21C MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING , Herstellen von Blechen, Metalldraht, -stangen, -rohren Metallprofilen oder Halbzeugen auf andere Weise als durch Walzen / B22D CASTING OF METALS , Gießen von Metallen / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / C21D Veränderung der physikalischen Struktur von Eisenmetallen , MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS / C22F CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS OR NON-FERROUS ALLOYS , Verändern der physikalischen Struktur von Nichteisenmetallen oder Nichteisenlegierungen



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