【摘要】 铝合金框梁薄壁零件被广泛应用于航空航天领域，然而在机械加工过程中该类零件往往出现严重变形，铝合金毛坯的初始残余应力是导致加工变形最主要的因素。本研究以典型单面三框零件为研究对象，并以“生死单元”的方式开展了加工变形有限元仿真，提出了以预变形装夹方法为核心的加工变形控制方法，设计了适用于典型单面三框零件的装夹布局，开展了加工变形控制方法的有效性验证。实验结果表明，相对于传统的真空吸盘装夹方式，本研究提出的预变形装夹方式能够在最大变形量和平面度两个指标方面分别实现66.5%和55.8%的优化。更多还原

【Abstract】 The frame-beam thin-wall parts of aluminium alloy are widely used in the aerospace engineering. However, such parts often come into significant deformation in the machining. The initial residual stress in the aluminium alloy blank is identified as the most critical factor influencing the machining deformation. In this study, a typical single-sided three-frame part was investigated. The simulation by using "model change" approach was carried out. A deformation control method based on pre-deformation clamp was proposed, and the clamp layout for typical single-sided three-frame parts was designed. The verification of its effectiveness in preventing deformation was conducted, and the experimental results demonstrated that comparing with traditional vacuum fixture, the pre-deformation clamp method achieved the improvements by 66.5% and 55.8% in the maximum deformation and flatness, respectively.更多还原