锻压技术

飞机滑轨工艺凸台增材-锻造复合制造技术

英文标题：Additive-forging composite manufacturing technology for process boss of aircraft slide

单位：1.重庆大学 2.中国第二重型机械集团德阳万航模锻有限责任公司 3.华中科技大学

分类号：TG316

出版年,卷(期):页码：2023,48(2):1-9

摘要：

为了解决某飞机用30CrMnSiNi2A钢滑轨锻件在锻造过程中存在的工艺凸台未充满和折叠等问题，提出了一种增材-锻造复合制造技术。首先，以30CrMnSiNi2A钢作为药芯焊丝，采用电弧熔丝技术在滑轨锻件上增材出工艺凸台；然后，对构件进行一体化锻造，实现整体构件的锻造成形；最后，对热处理后的增材区、增材与锻件本体的连接区进行低、高倍显微组织观察和力学性能检测。结果表明：经过增材-锻造复合制造后，构件增材区的工艺凸台充填完整，晶粒度达到7级或更高，与一体化锻件的晶粒度相当；然而，部分区域中存在明显的气孔和夹杂等缺陷，导致该区域的力学性能严重下降。在低倍下无明显缺陷的试样，其抗拉强度、屈服强度、伸长率和冲击韧性与锻件本体的相当；而有明显缺陷的试样在测试中发生了提前失效，其性能明显低于锻件本体的性能。

In order to solve the problems of underfilling and folding of process boss in the forging process of 30CrMnSiNi2A steel slide forgings for an aircraft, an additive-forging composite manufacturing technology was proposed. First, 30CrMnSiNi2A steel was used as flux cored wire, and the process boss was produced on the slide rail forgings by the arc fuse technology. Then, the component was forged integrally to achieve the forging of the whole component. Finally, the low and high magnification microstructure observation and mechanical property inspection were carried out on the heat treated additive area and the connection area between adding material and forgings. The results show that after the additive-forging composite manufacturing, the process boss in the additive area of component is completely filled, and the grain size reaches grade seven or higher, which is equivalent to the grain size of the integrated forgings. However, there are obvious defects such as porosity and inclusion in some areas, which lead to the serious decline of mechanical properties in this area. The tensile strength, yield strength, elongation and impact toughness of the sample without obvious defects at low magnification are equivalent to those of the forgings while the specimen with obvious defects fails early during the test, and its performance is significantly lower than that of the forgings.

基金项目：

国家重点研发计划（2018YFB1106501）

作者简介：孙朝远（1986-），男，博士研究生，高级工程师，E-mail：cysun316@163.com；通信作者：周杰( 1965-)，男，博士，教授，E-mail：zhoujie@cqu.edu.cn

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