摘要
目的TA1钛合金作为药型罩材料,具有提高穿深和侵彻孔径的优异表现,但其剪切旋压成形过程中塑性变形规律复杂且难于控制,以期通过有限元数值计算解析多工艺参数的协同作用。方法建立了TA1薄壁锥形件结构旋压加工过程的三维非线性热-力耦合有限元模型,研究了TA1从圆形板坯到锥形件旋压全过程的金属塑性变形行为、应力及应变的变化。采用正交实验分析了旋轮进给速率、芯轴转速与板坯厚度对成形过程的旋压力以及成形样件的内径偏差和壁厚偏差的影响规律。结果结果表明,锥形件侧壁的塑性应变沿母线方向逐渐减小,最大应变值出现在靠近锥形件顶部的小端面位置。旋压载荷随旋轮进给速率与板坯厚度增加而增加,随芯轴转速增加而减小。内径偏差随进给速率与板坯厚度的增加而减小,与芯轴转速的相关性较小。壁厚偏差随进给速率的增加先减小后增大,随芯轴转速与板坯厚度的增加而减小。结论基于数值模拟结果,获得TA1薄壁锥形件的优化工艺参数为:旋轮进给速率300mm/min,芯轴转速260r/min,板坯初始厚度4mm。开展了TA1钛合金剪切旋压成形实验,所得锥形件尺寸与模型计算结果一致,验证了模型的准确性。
The liner fabricated by TA1 titanium alloy possesses high penetration depth and penetration aperture,but its plas-tic deformation behavior is very complex and difficult to be controlled during conical shaped charges.Therefore,the work aims to apply the finite element calculation method to clarify the synergistic effects of the multiple process parameters.The three-dimensional nonlinear thermo-mechanical coupling finite element model was established for the spinning process of TA1 thin-walled conical structure.The plastic deformation behavior of the metal and the change of stress and strain during the whole spinning process of TA1 from circular plate to conical part were investigated.The effects of roller feed rate,mandrel rotational speed and plate thickness on the spinning pressure during the forming process,as well as the inner diameter deviation and wall thickness deviation of the formed samples were analyzed by orthogonal experiment.The results showed that the plastic strain in the side wall of the conical part decreased gradually along the direction of the busbar,and the maximum strain value appeared at the small end position near the top of the conical part.The spinning load increased with the increase of roller feed rate and plate thickness,and decreased with the increase of mandrel rotational speed.The inner diameter deviation decreased with the increase of roller feed rate and plate thickness,with less correlation to mandrel rotational speed.The wall thickness deviation decreased firstly and then increased with the increasing roller feed rate,and decreased with the increase of mandrel rotational speed and plate thickness.Based on the numerical simulation results,the optimized process parameters of TA1 thin-walled conical part are obtained as follows:roller feed rate of 300 mm/min,mandrel rotational speed of 260 r/min and initial plate thickness of 4 mm.TA1 titanium alloy shear spinning forming experiments are carried out and the size of the conical parts obtained is consistent with the model calculations
作者
邵玉林
刘博
潘贵平
刘占洲
张驰
张立文
邵志文
王市均
SHAO Yulin;LIU Bo;PAN Guiping;LIU Zhanzhou;ZHANG Chi;ZHANG Liwen;SHAO Zhiwen;WANG Shijun(School of Materials Science and Engineering,Dalian University of Technology,Liaoning Dalian 116024,China;Southwest Institute of Technology and Engineering,Chongqing 400039,China;Ningbo Branch,Ordnance Science Institute of China,Zhejiang Ningbo 315103,China;China Metallurgical Information and Standardization Institute,Beijing 100730,China)
出处
《精密成形工程》
北大核心
2024年第8期1-10,共10页
Journal of Netshape Forming Engineering
基金
国家自然科学基金(52274375)
宁波市科技计划项目(2022Z108)。
关键词
剪切旋压
TA1钛合金
锥形件
数值模拟
塑性变形
shear spinning
TA1 titanium alloy
conical part
numerical simulation
plastic deformation
