摘要
基于Power-Cutoff模型,利用ProCAST软件在液态至半固态的浇注温度区间内,对AZ91D镁合金变速箱壳体压铸工艺进行了分析。通过正交试验研究了冲头压射速度、浇注温度、模具温度以及模具与压铸件间传热系数对镁合金变速箱壳体压铸件内缺陷率的影响规律,并优化了工艺参数。结果表明,在保证AZ91D镁合金的内浇道充型速度为40-90m/s时,冲头压射速度对压铸件内最大缺陷率的影响不明显,但较低的压射速度能明显降低压铸件内的总缺陷率。半固态浇注温度区间、较高的模具温度以及较低的模具与压铸件间传热系数均能显著降低压铸件内最大缺陷率以及总缺陷率。最终得到的最优工艺参数：冲头压射速度为5m/s,浇注温度为570℃,模具温度不低于200℃,模具与压铸件间传热系数为500W/（m2·K）。
Based on Power-Cutoff model, using ProCAST casting simulation software, the die-casting process for magnesium alloy gearbox case at liquidus and semi-solid temperature region was analyzed. By orthogonal experiments, effects of plunger injection speed, casting temperature, mold temperature and the heat transfer coefficient between die mold and die castings on the defect rate were visualized, and the processing parameters were optimized. The results reveal that injection velocity on the maximum defect rate in die casting can be neglected, while lower injection speed can greatly reduce the total casting defect rate with ingate velocity between 40-90 m/s. Moreover, both the maximum and total casting defect rate can be significantly reduced with semi-solid casting temperature, higher mold temperature and lower heat transfer coefficient between die mold and castings. The optimized processing parameters were presented as follows： the plunger injection speed of 5 m/s, pouring-temperature of 570 ℃, mold temperature more than 200℃ and heat transfer coefficient between die mold and castings of 500 W/（m2· K）.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2014年第8期824-828,共5页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(51201144)
中央高校基本科研业务费专项资金资助项目(2682013CX003)
四川省科技成果转化项目(2012CC0012)
