激光选区熔化TC4闭式叶轮的成形仿真与支撑优化设计  

Forming Simulation and Support Optimization Designof Laser Selective Melting TC4 Closed Impeller

作　　者：张文玮 李博海 刘征 赵猛 张琦 陈孟 ZHANG Wenwei;LI Bohai;LIU Zheng;ZHAO Meng;ZHANG Qi;CHEN Meng(Air China Guizhou Honglin Aviation Power Control Technology Co.,Ltd.,Guiyang 550000,China;College of Aviation Manufacturing and Mechanical Engineering,Nanchang Hangkong University,Nanchang 330063,China;Unit 93147 of the People's Liberation Army,China)

机构地区：[1]中国航发贵州红林航空动力控制科技有限公司,贵州贵阳550000 [2]南昌航空大学航空制造与机械工程学院,江西南昌330063 [3]中国人民解放军93147部队

出　　处：《热加工工艺》2024年第20期123-128,139,共7页Hot Working Technology

基　　金：国家自然科学基金项目(52105356);江西省自然科学基金项目(20232BAB214003)。

摘　　要：随着金属增材制造技术的快速发展,激光选区熔化技术因具有成形自由度大、精度高及表面粗糙度低的优势,被广泛应用于钛合金闭式叶轮的生产。在增材制造过程中,闭式叶轮内部通常无法自成形,需要添加支撑结构。为了能够设计出最优的闭式叶轮内部支撑方案,利用Simufact Additive增材制造仿真模拟软件,对闭式叶轮成形过程的变形以及残余应力进行模拟仿真。基于仿真结果,调整支撑的类型、尺寸、分布以及成形参数来调控支撑本体的力学性能,并使用微观CT等手段分析了支撑强度和孔隙率之间的关系。结果表明:支撑优化后,闭式叶轮内腔支撑去除后的表面粗糙度从原块体支撑的528μm降到了13μm,疲劳强度提高了约84.8%。With the rapid development of metal additive manufacturing technology,laser selective melting technology(SLM)is widely used in the production of titanium alloy closed impeller because of its advantages of large forming freedom,high precision and low surface roughness.In the additive manufacturing process,the inside of the closed impeller is usually unable to self-form,and a support structure needs to be added.In order to design optimal internal support structure of a closed impeller,Simufact Additive software was used to simulate the deformation and residual stress during the forming process of the closed impeller.Based on the simulation results,the mechanical properties of the support body were regulated by adjusting the type,size,distribution and process parameters of the support,and the relationship between the support strength and porosity was analyzed by means of microscopic CT.The results show that the surface roughness of the optimized inner cavity of the closed impeller after support removal is reduced from 528μm of the original block support to 13μm,and the fatigue strength is increased by 84.8%.

关 键 词：金属增材制造 成形仿真 闭式叶轮 支撑优化 

分 类 号：TG441.8[金属学及工艺—焊接] TG456.7