熔模铸造发动机支架的数值模拟及工艺优化

Numerical Simulation and Process Optimization of Investment Casting Aeroengine Bracket

某小型航空支架铸件,材质为ZG16Cr2MnTi合金钢,采用熔模铸造进行小批量生产,尺寸精度较高。初始工艺方案在实际生产中常出现气孔、夹渣、缩孔等缺陷,经过计算机模拟分析并结合实际经验对其进行优化,将蜡模翻转180°组装,且蜡模向下倾斜10°左右,使浇注系统类似于倾斜顶注式浇注;优化后采用型腔倾斜并翻转布置方案,铸件合格率大幅度提高。

The small ZG16 Cr2 MnTi alloy steel aerospace bracket with a higher dimension accuracy was produced in small batch by investment casting.Gas hole,slag inclusion and shrinkage hole often occur in the castings of the initial design in actual production.After simulation and analysis,and combined with practical experience,the design was modified.The wax pattern was assembled by in turnover 180°and was declined down to 10°to realize tilting tope pouring.Through adopting cavity declination and turnover assembling design,the qualified rate the investment casting bracket was improved greatly.