The invention discloses a high-strength and high-toughness aluminum alloy brake caliper and an extrusion casting method thereof. The aluminum alloy brake caliper is prepared from, by mass, 6.8%-7.2% of Si, 0.36%-0.41% of Mg, 0.08%-0.12% of Ti, 0.01%-0.03% of Sr, smaller than or equal to 0.15% of Fe and the balance Al and other inevitable impurities. The extrusion casting method sequentially comprises the steps of smelting and preparing aluminum alloy liquid, deslagging and dehydrogenation treatment, extrusion casting forming, solid solution treatment and aging treatment. By scientifically designing the composition of the aluminum alloy brake calipers and the extrusion casting process, refining alpha-Al grains and eutectic Si phases, the purity of aluminum alloy liquid is improved, the harm of hydrogen holes and inclusions to the strength and plasticity is eliminated, the strength and plasticity of the aluminum alloy brake calipers are improved, the tensile strength is larger than or equal to 300 MPa, the yield strength is larger than or equal to 270 MPa, the percentage elongation after fracture is larger than or equal to 8%, and the service life of the aluminum alloy brake calipers is prolonged. Compared with traditional metal mold gravity casting, the strength of the aluminum alloy brake calipers is improved by 10%, the plasticity is improved by 50% or above, and the design and manufacturing requirements of automobile light weight are met.
本发明公开了一种高强韧铝合金制动器卡钳及其挤压铸造方法,铝合金制动器卡钳由以下质量百分比的成分组成:Si 6.8‑7.2%,Mg0.36‑0.41%,Ti 0.08‑0.12%,Sr 0.01‑0.03%,Fe≤0.15%,其余为Al和不可避免的其它杂质。挤压铸造方法依次包括熔炼配制铝合金液、除渣除氢处理、挤压铸造成型、固溶和时效处理。通过科学设计铝合金制动器卡钳的成分组成和挤压铸造工艺,细化α‑Al晶粒和共晶Si相,提高铝合金液的纯净度,消除氢气孔和夹杂物对强度和塑性的危害,提高铝合金制动器卡钳的强度和塑性,抗拉强度≥300MPa,屈服强度≥270MPa,断后伸长率≥8%,相比于传统金属型重力铸造,铝合金制动器卡钳的强度提高了10%,塑性提高了50%以上,满足汽车轻量化的设计制造需求。
High-toughness aluminum alloy brake caliper and extrusion casting method thereof
一种高强韧铝合金制动器卡钳及其挤压铸造方法
2024-04-09
Patent
Electronic Resource
Chinese
IPC: | C22C Legierungen , ALLOYS / B22D CASTING OF METALS , Gießen von Metallen / B60T Bremsanlagen für Fahrzeuge oder Teile davon , VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF / C21D Veränderung der physikalischen Struktur von Eisenmetallen , MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS / C22B PRODUCTION OR REFINING OF METALS , Gewinnen oder Feinen von Metallen / C22F CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS OR NON-FERROUS ALLOYS , Verändern der physikalischen Struktur von Nichteisenmetallen oder Nichteisenlegierungen / F16D COUPLINGS FOR TRANSMITTING ROTATION , Nicht schaltbare Kupplungen |
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