高出品率超大型钛合金中介机匣数值模拟工艺研究  

Study on the Numerical Simulation Process of Oversized Titanium Alloy Intermediary Casing with a High Yield Rate

作　　者：龙兴权 高晓慧 李鹏超 付志鹏 LONG Xingquan;GAO Xiaohui;LI Pengchao;FU Zhipeng(Guizhou Anji Aviation Investment Casting Co.,Ltd.,An'shun 561000,China)

机构地区：[1]贵州安吉航空精密铸造有限责任公司,贵州安顺561000

出　　处：《铸造技术》2024年第10期988-993,共6页Foundry Technology

摘　　要：某超大型钛合金中介机匣铸件是某航空发动机中的关键部件,结构复杂,壁厚截面差值大,是目前航空发动机尺寸和质量最大的中介机匣铸件。传统单股进水工艺方案易导致机匣铸件支板、分流环及外环等多处形成汇流,充型困难,易产生飞溅、冷隔等铸造缺陷。利用ProCAST模拟软件对熔模铸造工艺下中介机匣铸件进行数值模拟,采用底注式离心浇注,设置不同股数进水工艺和浇道数量比,研究对比不同设计方案下金属液在充型和凝固过程中的流场、温度场变化,选择最优浇注工艺方案,以期实现超大型钛合金中介机匣铸件的完整成型。模拟结果表明,利用铸件本身结构特点,采用4股进水工艺,并增加缝隙浇道,当直浇道∶横浇道∶内浇道数量比为1.0∶1.2∶2.5时,铸件出品率达到57%。随后对该工艺方案进行了试验验证,得到满足相关技术协议规定的铸件,验证了模拟结果的可行性和准确性。Oversized titanium alloy intermediary casing casting is a key component of aero engines,with a complex structure and greatly varying wall thickness,which is the largest and heaviest intermediary casing casting in aviation engines at present.Traditional single-strand water inlet process schemes are prone to causing converging flows at multiple locations,such as the struts,splitter rings,and outer rings of the casing,leading to difficulties in mold filling and susceptibility to casting defects such as splashing and cold shuts.To address this,numerical simulations of the investment casting process for intermediate casing casting were conducted via ProCAST simulation software.Bottom-pour centrifugal casting was employed,with different numbers of water inlet strands and gate ratios being set.Changes in the fluid field and temperature field during the mold filling and solidification processes under different design schemes were studied and compared to select the optimal pouring process scheme.This aimed to achieve complete molding of the superlarge titanium alloy intermediate casing,paving the way for efficient aerospace engine production.The simulation results indicate that by utilizing the structural characteristics of the casting itself and adopting a four-strand water inlet process with additional slot gates,setting the ratio of sprue to runner to ingate as 1.0∶1.2∶2.5,the casting yield reaches 57%.Subsequent experimental validation of this process scheme yields castings that meet the relevant technical agreement specifications,with experimental results aligning with the simulation outcomes,thereby verifying the feasibility and accuracy of the simulation results.

关 键 词：超大型 钛合金 铸造模拟 方案设计 出品率 

分 类 号：TG249.5[机械工程—精密仪器及机械]