Simulation Analysis of Pyrotechnic Cutter and Structural Optimization Design
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摘要:采用非线性有限元软件ABAQUS建立了火工切割器切割过程的仿真模型，研究了钛杆在切割器工作过程中的切割和断裂行为，以及不同钛杆直径和切刀刃口角度对切割效果的影响，为切割器的结构设计提供了理论依据。此外，研究发现，当切刀转动角度小于20°时，切割所需能量稳定，超过20°后则随着角度增加而增加。基于仿真分析结果，提出了结构优化方案，设计了支撑环以限制切刀的转动范围，并通过尺寸调整避免活动刀与固定刀刀刃碰撞，减少碎刀风险。优化后的切割器经试验验证，能有效切断钛杆并显著降低了碎刃产生多余物的风险。
Abstract:A simulation model of the cutting process of a pyrotechnic cutter was established using the nonlinear finite element software ABAQUS. The cutting and fracture behavior of titanium rod during the operation of the pyrotechnic cutter, as well as the impact of different titanium rod diameters and blade angles on the cutting effect were studied, providing a theoretical basis for the structural design of the cutter. It was also found that the cutting energy requirement is stable when the blade rotation angle is less than 20°, but increases with the angle beyond 20°. Based on the simulation results, an optimized design was proposed. A support ring was designed to limit the rotation range of the blade, and the size was adjusted to avoid collision between the moving and fixed blade edges, reducing the risk of blade breakage. The optimized cutter, verified by test, can effectively cut the titanium rod and significantly reduce the risk of debris from blade breakage.
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