采用多向镦粗对7075铝合金试样进行压缩,利用有限元软件对多向镦粗的组织晶粒度预报,探索模拟分析与实验分析相结合的方法,研究7075铝合金多向镦粗过程的组织晶粒变化规律,并对五道次镦粗试样与初始样进行室温拉伸力学性能测试和采用SEM断口形貌观察。模拟结果表明:经过5道次镦粗后试样中心区域的组织晶粒明显细化,晶粒尺寸从初始的40μm减小到17μm;随着道次的增加,组织晶粒细化效果逐渐减弱。对比模拟预报与实验分析结果表明:两者在晶粒细化程度上吻合良好;经过5道次镦粗之后,拉伸断裂强度从初始的547 MPa增加到665 MPa,断面收缩率从初始的7.1%增加到28.4%,断口韧窝深而大,强度塑性明显提高。 The multi-directional upsetting was used to compress 7075 aluminum alloy sample. Finite element software was used to forecast the grain size of multi-directional upsetting. The combination of simulation analysis and experimental analysis was explored to study the multi-directional upsetting process of 7075 aluminum alloy. The results show that the tensile properties of the samples are similar to those of the original samples. The simulation results show that the grain size in the central region of the sample after 5 upsetting is obviously refined, and the grain size decreases from 40 μm to 17 μm. With the increase of the pass, the grain refinement effect of the grain is gradually weakened . The results of comparative simulation and experimental analysis show that the two are in good agreement with the degree of grain refinement. After 5 times of upsetting, the tensile strength at break increases from 547 MPa to 665 MPa, and the reduction of area from the initial 7.1 % Increased to 28.4%, the fracture dimples deep and large, strength plastic obviously improved.