电机机壳的铸造工艺一般采用湿型干芯工艺。但由于型芯尺寸较大，泥芯烘干后容易变形。后经我们改进工艺，以湿型芯加金属芯来代替干芯，取得良好的效果。具体操作顺序如图１所示。（ａ）将金属芯头放入芯盒内；（ｂ）插入芯棒，填上普通型砂，■实；（ｃ）取出芯棒，刮平填砂 Casting process of the motor casing commonly used wet dry core technology. However, due to larger core size, mud core is easy to deformation after drying. After we improve the process to wet core plus metal core instead of dry core, and achieved good results. The specific operation sequence shown in Figure 1. (A) Insert the metal core into the core box; (b) Insert the core rod and fill the normal sand;