The casting technique with top gating system, outer shaped iron chill, compound casting mold and core assembly molding was used for producing aluminum impeller on a large scale successfully.

详细介绍了采取顶注式浇注系统、成形外冷铁、复合铸型、组芯造型的铸造工艺，成功地生产出批量铝叶轮。

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It only can separate mold from core frequently, and then conduct the assembly; positioning error is increased.

往往只能型芯分开成型，再进行组装，定位误差增加。

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3 get the core length, core assembly size is determined according to the structure size of the mold core seat;

得到模芯的长度后，根据模芯座的结构尺寸确定模芯装配尺寸；

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