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为了消除低压铸造中AC4C铝合金压气机壳铸件的缩松缺陷,利用ProCAST软件进行了铸件充填和凝固过程的数值模拟。根据仿真结果对铸件的浇注系统进行了分析优化。结果表明,浇注时铸件无法按顺序凝固,且缩松较多。将铸件反置,并使充填压力从0.035 MPa减小至0.028 MPa,金属液的充填过程趋于稳定,但铸件热节处仍存在缩松。最后,通过增加铸件冒口,缩松缺陷基本消除。根据仿真结果成功铸造出形状完整、表面光滑和显微结构致密的AC4C铝合金压气机壳铸件。
In order to eliminate the shrinkage defects of AC4C aluminum alloy compressor shell castings in low pressure casting, the numerical simulation of casting filling and solidification process was carried out by using ProCAST software. Based on the simulation results, casting casting system was analyzed and optimized. The results show that castings can not be solidified in sequence and have more shrinkage. The castings were reversed and the filling pressure was reduced from 0.035 MPa to 0.028 MPa. The filling process of the molten metal tended to be stable, but shrinkage still existed at the casting hot section. Finally, by adding casting riser, shrinkage defects were basically eliminated. Based on the simulation results, the castings of AC4C aluminum alloy compressor casing with complete shape, smooth surface and compact microstructure were successfully cast.