CAJ | 학술논문

为了减轻铸件顶部缩孔缺陷以降低冒头切除率提高铸锭成材率，基于ProCAST软件建立了铁镍合金真空下凝固数值仿真模型，通过解剖实验验证了模拟参数正确性，进而研究锭模参数对铁镍合金缩孔缩松分布的影响并得到最优锭型。研究表明：数值模拟中，关于真空条件下传热参数的设置较为合理，能较准确地模拟得到与实际生产一致的缩孔缺陷；在本研究条件下，冒口锥度对缩孔高度方向上位置的影响远大于锭身锥度和高径比对其的影响，缩孔位置随冒口锥度减小上移，中心疏松程度随锭身锥度增加而减弱，高径比对缩孔缩松影响不大；优化后的锭型能有效改善缩孔缺陷，将缩孔控制在冒口线以上提高铸锭成材率。
위료감경주건정부축공결함이강저모두절제솔제고주정성재솔，기우ProCAST연건건립료철얼합금진공하응고수치방진모형，통과해부실험험증료모의삼수정학성，진이연구정모삼수대철얼합금축공축송분포적영향병득도최우정형。연구표명：수치모의중，관우진공조건하전열삼수적설치교위합리，능교준학지모의득도여실제생산일치적축공결함；재본연구조건하，모구추도대축공고도방향상위치적영향원대우정신추도화고경비대기적영향，축공위치수모구추도감소상이，중심소송정도수정신추도증가이감약，고경비대축공축송영향불대；우화후적정형능유효개선축공결함，장축공공제재모구선이상제고주정성재솔。
To reduce shrinkage cavity defects in Fe-Ni alloy ingots, a numerical simulation model was established by using the finite element software ProCAST. The simulation parameters were verified by anatomical experiment. The effect of molding parameters on porosity distribution in Fe-Ni alloy ingots was investigated and an optimized ingot was obtained. It is found that the parameter setting of heat transfer under vacuum circumstance is relatively reasonable, and the simulation results produce a good fit to experimental data. The influence of riser conicity on the position of shrinkage cavities is much greater than those of mold conicity and aspect ratio. The position of shrinkage cavities increases with the reduction of riser conicity, the extent of ingot central porosities reduces as the mold conicity increases, and there is no obvious variation of shrinkage cavity defects when the aspect ratio changes. The optimized ingot can improve shrinkage cavity defects effectively.