依靠六氟化硫气体进行绝缘和灭弧的高压开关设备,其使用的拐臂盒零件必须具有非常高的组织健全性以保证气密性要求。由于结构设计的不合理,该零件废品率一直居高不下(最高达70%～80%),铸造工艺难度大,成本高,主要问题是缩孔和缩松缺陷造成的组织不健全。 High-voltage switchgear, which rely on sulfur hexafluoride gas for insulation and arc suppression, must use a very high degree of tissue integrity to ensure air tightness. Due to the unreasonable structural design, the scrap rate of the parts has been continuously high (up to 70% ~ 80%), the casting process is difficult and the cost is high. The main problem is that the organization caused by shrinkage and shrinkage defects is not perfect.