“路徽”是韶山型干线电力机车两端的标志。材质为铸造铝合金(ZL102),表面光洁度要求▽7,抛光后无任何缺陷。铸件重8.5公斤。铸件如图1所示。产品大,质量要求高。过去我们一直采用砂型铸造,铸件在加工后经常发现针孔或缩松现象而造成报废。为了解决这个问 “Road Emblem” is Shaoshan-type electric locomotive at both ends of the mark. Material for the cast aluminum (ZL102), surface finish requirements ▽ 7, polished without any defects. Casting weight 8.5 kg. Casting shown in Figure 1. Products, high quality requirements. In the past we have been using sand casting, casting found in the processing often pinhole or shrinkage caused by scrapped. In order to solve this question