典型薄壁窄槽深盲腔钛合金铸件工艺数值模拟及优化

Numerical Simulation and Optimization of the Thin-wall,Narrow-groove and Deep-blind Cavity Titanium Alloy Casting

聚焦于钛合金铸件,尤其是薄壁窄槽深盲腔结构件的熔模真空离心铸造技术,鉴于钛合金具有较高的化学活性,易与多种大气成分发生反应,因此对型壳材料的选择及其干燥过程提出了严格要求。然而,由于窄槽深盲腔型壳受限于干燥条件,浇注过程中易产生冷隔、欠铸、气缩孔等缺陷,导致其铸件质量的稳定性未能满足服役标准。针对这一问题,采用铸造模拟仿真技术,对金属液充型行为进行精确分析,以确保薄壁区域按序填充,并优化离心铸造中的补缩路径和气体逸散通道,有效解决了密集气孔的问题,实现复杂钛合金铸件的稳定批量生产。

The focus of this paper is on vacuum investment casting technology for titanium alloy castings,particularly those with thin-walled narrow grooves and deep blind cavity structures.Owing to the high chemical reactivity of titanium alloys,which are susceptible to reactions with various atmospheric components,stringent requirements are placed on the selection and drying process of mold shell materials.However,limited drying conditions in narrow,deep blind cavity molds often lead to defects such as cold shuts,misruns,and gas porosity during pouring,causing the castings to fall short of service standards.To address this issue,casting simulation technology was utilized to analyse metal-filling behavior precisely and ensure the sequential filling of thin-walled regions.Additionally,the filling path and gas escape channels in the investment casting process were optimized,effectively resolving issues related to dense pores and achieving stable mass production of complex titanium alloy castings.