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在试制AC7A铝合金框架铸件过程中,使用铸造模拟软件Adstefan,分析了铸件充型、凝固和应力产生的过程,认为内浇道流量严重不均导致的铸件温度场分布差异较大,引起大的铸造应力和应变,是裂纹产生的主要原因。优化后的铸造工艺方案,使铸件浇注、凝固过程更为合理,使铸造等效应力和应变分别降低了10%和20%,解决了铸造热裂的问题。
During the process of trial production of AC7A aluminum frame castings, casting simulation software Adstefan was used to analyze the process of filling, solidification and stress generation of castings. It was found that there was a large difference in the distribution of temperature field of castings caused by serious runner flow irregularities, Casting stress and strain are the main causes of cracks. The optimized casting process scheme makes the casting pouring and solidification process more reasonable and reduces the equivalent stress and strain of casting by 10% and 20% respectively, which solves the problem of thermal cracking in casting.