钛合金铆钉辗铆成形的仿真与试验研究  

Simulation and experiment study on spin riveting forming for titanium alloy rivet

作　　者：许猛[1] 易帆 李扬[1] 赵向东 张儒 吴凯迪 唐娜娜 Xu Meng;Yi Fan;Li Yang;Zhao Xiangdong;Zhang Ru;Wu Kaidi;Tang Nana(Capital Aerospace Machinery Corporation Limited,China Academy of Launch Vehicle Technology,Beijing 100076,China)

机构地区：[1]中国运载火箭技术研究院首都航天机械有限公司

出　　处：《锻压技术》2018年第11期72-76,共5页Forging & Stamping Technology

摘　　要：针对大直径钛合金铆钉在摆辗铆接过程中易产生开裂缺陷的问题,采用有限元软件ABAQUS建立了辗铆过程的仿真模型,通过Explicit求解器对有限元模型进行模拟计算。通过对仿真结果和铆接变形过程的分析研究,优化了摆辗铆接过程的工艺参数（铆接过程的单次压下量为1. 5 mm）,并改进了铆钉的局部结构（铆钉头外圆倒角为R1 mm）及尺寸（铆钉超出零件表面长度由10 mm减小为6 mm）。再次使用有限元方法对优化后的辗铆过程进行了仿真验证,结果显示辗铆过程中钛合金铆钉应力值为859 MPa,未超过材料的抗拉强度921. 97 MPa。最后,通过试验验证了改进后的加工方案可有效解决大直径钛合金铆钉辗铆开裂的问题,达到了指导设计与生产的目的。For the problem of cracking defect for large diameter titanium alloy rivets in the spin riveting process,the simulation model of the spin riveting process was established by the finite element software ABAQUS,and the finite element model was simulated and calculated by the Explicit solver. Through the research and analysis on the simulation results and the spin riveting deformation process,the process parameters of the spin riveting were optimized（the reduction per pass reached 1. 5 mm）,and the local structure（the excircle fillet of rivet head was R1 mm） and size（the length of rivet exceeding the surface of part reduced from 10 mm to 6 mm） of rivet were improved. Then,the optimized spin riveting process was verified by the finite element method again. The results show that the stress of titanium alloy rivets in the spin riveting process is 859 MPa,which is lower than the material tensile strenght of 921. 97 MPa. Finally,it proves that the improved process scheme can effectively solve the cracking defect of large diameter titanium alloy rivet in the spin riveting process by experiment verification,and it achieves the purpose of guiding the design and production.

关 键 词：辗铆 钛合金 开裂缺陷 有限元 ABAQUS 

分 类 号：V19[航空宇航科学与技术—人机与环境工程] TG3[金属学及工艺—金属压力加工]