Liu Jintong, Zhao Anan, Wan Piao, Dong Huiyue, Bi Yunbo
State Key Laboratory of Fluid Power and Mechatronic System, College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China.
Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China.
Materials (Basel). 2020 Jun 26;13(12):2866. doi: 10.3390/ma13122866.
Interlayer burrs formation during drilling of stacked plates is a common problem in the field of aircraft assembly. Burrs elimination requires extra deburring operations which is time-consuming and costly. An effective way to inhibit interlayer burrs is to reduce the interlayer gap by preloading clamping force. In this paper, based on the theory of plates and shells, a mathematical model of interlayer gap with bidirectional clamping forces was established. The relationship between the upper and lower clamping forces was investigated when the interlayer gap reaches zero. The optimization of the bidirectional clamping forces was performed to reduce the degree and non-uniformity of the deflections of the stacked plates. Then, the finite element simulation was conducted to verify the mathematical model. Finally, drilling experiments were carried out on 2024-T3 aluminum alloy stacked plates based on the dual-machine-based automatic drilling and riveting system. The experimental results show that the optimized bidirectional clamping forces can significantly reduce the burr heights. The work in this paper enables us to understand the effect of bidirectional clamping forces on the interlayer gap and paves the way for the practical application.
叠层板钻孔过程中的层间毛刺形成是飞机装配领域的一个常见问题。去除毛刺需要额外的去毛刺操作，既耗时又昂贵。抑制层间毛刺的一种有效方法是通过预加载夹紧力来减小层间间隙。本文基于板壳理论，建立了双向夹紧力作用下层间间隙的数学模型。研究了层间间隙为零时上下夹紧力之间的关系。对双向夹紧力进行了优化，以降低叠层板挠度的程度和不均匀性。然后，进行了有限元模拟以验证数学模型。最后，基于双机自动钻铆系统对2024-T3铝合金叠层板进行了钻孔实验。实验结果表明，优化后的双向夹紧力可以显著降低毛刺高度。本文的工作使我们能够了解双向夹紧力对层间间隙的影响，并为实际应用铺平了道路。
