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利用数值模拟技术研究了阀体铸件的充型和凝固过程,分析了液态合金的流动状态、铸件的凝固顺序以及热应力分布的情况,预测了可能出现的铸造缺陷,如冷隔、浇不足以及缩孔、缩松等。得出的优化方案为将原始铸造工艺中的双直浇道结构改为较为简单的单直浇道系统;增加冷铁以调整铸件的凝固顺序;为消除铸件中出现的开裂现象,采用中空型芯以增加铸型的退让性。采用改进的工艺方案,最终获得了质量合格的铸件。
The process of filling and solidification of valve body castings was studied by means of numerical simulation. The flow conditions of liquid alloys, the order of solidification of castings and the distribution of thermal stress were analyzed. Possible casting defects such as cold separation, inadequate pouring, Shrinkage, shrinkage and so on. The optimized solution is to change the double-sprue structure in the original casting process to a simpler single-sprue system, to add cold iron to adjust the solidification order of the castings, to eliminate the cracking phenomenon in the castings, Core to increase the concession of the mold. The use of improved process options, and ultimately obtained the quality of qualified castings.