Simulation Analysis of Pyrotechnic Cutter and Structural Optimization Design
Affiliation:
China Academy of Space Technology Beijing Institue of Space Mechanics Electricity,Beijing,100094
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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仿真模型，分析了切割器工作过程中钛杆的切割、断裂形式，研究了不同钛杆直径、刃口角度下切割断裂形式的占比情况，为切割器的结构设计提供理论依据。另外，分析、归纳了切刀转动角度对切割能量的影响规律，结果表明：当切刀发生转动小于一定角度（约20°）时，切割钛杆所需的能量未增加，当转动超过该角度后，随着角度的增大所需的切割能量增大。基于仿真研究结果，在典型切割器产品的基础上提出了一种结构优化设计方案，防转刀的同时避免切割后活动刀与固定刀刀刃直接碰撞产生碎刀的风险，最终经仿真与试验验证，达到了预期效果。
Abstract:A simulation model of the cutting process of a pyrotechnic cutter was established using the nonlinear finite element software ABAQUS. The titanium rod cutting fracture forms was analyzed, and the proportion of cutting fracture forms under different titanium rod diameters and blade angles were studied , providing the oretical basis for the structural design of cutters. At the same time, the influence of cutter rotation angle on cutting energy was summarized. The results indicate that when the cutter rotates less than a certain angle (about 20 °), the energy required to cut the titanium rod does not increase. When the rotation exceeds this angle, the required cutting energy increases with the increase of angle. Based on the simulation research results, a structural optimization design scheme was proposed on the basis of typical cutter products, which not only prevents the rotation of the cutter but also avoids the risk of breakage caused by direct collision between the movable cutter and the fixed cutter blade after cutting. Finally, the expected effect was achieved through simulation and experimental verification.
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