TB6钛合金中央件成形工艺优化及仿真分析  

Optimization and simulation analysis on forming process for TB6 titanium alloy main rotor hub

作　　者：李智勇 花魁 徐平安 郭楠 王海鹏 刘保亮 宋阿敏 Li Zhiyong;Hua Kui;Xu Ping'an;Guo Nan;Wang Haipeng;Liu Baoliang;Song Amin(Changhe Aircraft Industry(Group)Co.,Ltd.,Jingdezhen 333002,China;Xi'an Triangle Defense Co,Ltd.,Xi'an 710089,China)

机构地区：[1]昌河飞机工业(集团)有限责任公司,江西景德镇333002 [2]西安三角防务股份有限公司,陕西西安710089

出　　处：《锻压技术》2024年第6期70-80,共11页Forging & Stamping Technology

基　　金：国家重点研发计划项目(2022XX5100)。

摘　　要：TB6钛合金中央件受限于锻件结构,易在其上、下端面产生大面积“变形死区”,以某型机中央件为研究对象,采用一种预锻结构设计来改善变形工步进而优化成形工艺。并应用数值仿真软件Simufact对影响锻件组织均匀性程度较大的预锻和终锻工序分别进行了应变分布、温度分布、金属流线分布、β相动态再结晶分数、β相平均晶粒尺寸和α相平均晶粒尺寸的预测和分析,同时,依据仿真结果进行了锻件试制。结果表明,引入中央件预锻结构设计的成形工艺合理、可行。预锻过程中,整体变形均匀,上、下端面处α相的平均晶粒尺寸不断减小,边缘处α相的平均晶粒尺寸有所变大,金属流线分布合理,预锻坯成形效果良好;终锻过程中,整体变形相对均匀,α相的平均晶粒尺寸在2.64~4.90μm之间,与基体β相实现了良好的尺寸匹配,金属流线分布合理,锻件成形效果良好。试制的TB6钛合金中央件锻件各位置组织性能的差异较小、均匀性良好。Due to the structural of forgings,the TB6 titanium alloy main rotor hub is prone to produce a large area of“deformation dead zone”at its upper and lower end faces.Therefore,for the main rotor hub of a certain type of helicopter,a pre-forging structure design was used for improving the deformation step to optimize the forming process.The strain distribution,temperature distribution,metal streamline distribution,dynamic recrystallization fraction ofβphase,average grain size ofβphase and average grain size ofαphase for the pre-forg-ing and final forging processes that had a great influence on the structure uniformity degree of forgings were predicted and analyzed by nu-merical simulation software Simufact.At the same time,the trial forgings were conducted based on the simulation result.The results show that the forming process with the pre-forging structure design of main rotor hub is reasonable and feasible.The deformation of the whole pre-forging process is uniform,the average grain size ofαphase at the upper and lower end faces decreases continuously,the average grain size ofαphase at edges increases,the distribution of metal streamline is reasonable,and the forming effect of the pre-forging blank is good.The overall deformation in the final forging process is relatively uniform,the average grain size ofαphase is between 2.64-4.90μm which makes a good size match with the matrixβphase,the metal streamline distribution is reasonable,and the forming effect of forgings is good.The trial TB6 titanium alloy main rotor hub forgings have litle difference and good uniformity in microstructure and properties.

关 键 词：TB6钛合金 中央件 预锻结构设计 平均晶粒尺寸 变形死区 

分 类 号：TG312[金属学及工艺—金属压力加工] TG316.3