The mathematical model of the mold thickness and casting is established, which is for the A356 aluminum casting by permanent mold, the solidification state of casting is analyzed in multiple of mold thicknesses by simulation software. The results show that the time of the casting from the initial temperature of 700℃ to the liquidus temperature of 613℃ is very short, and it's a definite value, and it does not relate to the wall thickness; the time of the casting is decreased from the liquidus temperature of 613 ℃ to the solidus temperature of 557℃ with the increase of mold thickness, and it's getting closer and closer to a definite value, and it relate to the wall thickness and the initial temperature of the mold;there is an economical wall thickness in the permanent mold, when the wall thickness is exceeded, the solidification state will not change again.%通过建立简单的模具壁厚与铸件的数学模型,数学模型为金属型模具的A356铝合金铸造,运用模拟分析软件对多种模具壁厚状态下的铸件凝固状态进行分析.结果表明:铸件从初始温度700℃到达液相线温度613℃的时间非常短,且是个定值,与模具壁厚无关;铸件从液相线温度613℃到达固相温度557℃的时间随模具壁厚的增加而减少,且逐渐趋近于某一定值,这一定值与铸件厚度和模具初始温度有关;金属型模具存在一个经济壁厚,超出这一壁厚时铸件凝固状态将不会再发生变化.
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