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。
2
3 get the core length, coreassembly size is determined according to the structure size of the moldcore 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；
3
The casting technique with top gating system, outer shaped iron chill, compound casting mold and coreassembly molding was used for producing aluminum impeller on a large scale successfully.