锻压技术

大型飞机起落架模锻件锻透性研究

英文标题：Research on forgeability of die forgings for large aircraft landing gear

分类号：TG316.3

出版年,卷(期):页码：2020,45(9):1-7

摘要：

通过反向有限元法设计了起落架模锻工艺路线，分别建立了预锻和终锻过程的三维有限元模型，分析了大型飞机起落架不同锻造过程中的晶粒尺寸和锻透性变化。结果表明，锻造过程对终锻件的残余应变及晶粒分布具有重要的影响。预锻加终锻的锻造过程比其他锻造过程更优。大型飞机起落架的终锻过程继承了预锻结果的残余应变，导致终锻过程的残余应变减小，终锻件的最大残余应变为0.272；终锻过程继承了预锻结果的再结晶体积分数和晶粒尺寸，有效地提高了难成形区域的再结晶体积分数，并细化了晶粒尺寸，终锻件的平均再结晶体积分数为80%，平均晶粒尺寸为Φ40 μm。由此可见，预锻加终锻的锻造过程能够有效地提高材料的锻透性，成形出满足使用要求的锻件。

The design route of die forging process for landing gear was designed by the inverse finite element method, and the three-dimensional finite element models of pre-forging and final forging processes were established, respectively. Then, the changes of grain size and forgeability for large aircraft landing gear during different forging processes were analyzed. The results show that the forging process has an important effect on the residual strain and the grain size distribution of finial forgings, and the forging process of pre-forging and final forging is better than other forging processes. The final forging process of large aircraft landing gear inherits the residual strains of pre-forging result and leads to a reduction of the residual strain for final forging process, and the maximum residual strain of final forgings is 0.272. Furthermore, the final forging process inherits the recrystallization volume fraction and grain size of pre-forging result to effectively improve the recrystallization volume fraction of difficult-to-form area and refine the grain size, and the average recrystallization volume fraction and the average grain size are 80% and Φ40 μm, respectively. Thus, the forging process of pre-forging and final forging improves the forgeability of materials and forms the forgings that meet the requirements of using.

基金项目：

国家自然科学基金资助项目（51435007）；国家重点研发计划（2018YFB1106003）

赵明杰（1995-），男，博士研究生 E-mail：zmj2017@hust.edu.cn 通讯作者：黄亮(1981-)，男，博士，副教授 E-mail：huangliang@hust.edu.cn

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