解决拐臂箱壳体铝铸件缩孔与缩松缺陷的工艺措施

Casting Technique on Solving Shrinkage Cavity and Porosity about Al Alloy Casing of Curved Arm Box

高压配电设备中的零件——拐臂箱壳体,其结构复杂,要求有高的组织致密性和高的强度。采用冷芯盒覆膜砂型重力铸造生产,工艺难度大,因缩孔与缩松缺陷造成铸件报废较多。在不能改变铸件结构的情况下,多次优化铸造工艺,特别是冷铁形状和安放位置的设计,使铸件的合格率从70%左右提高至90%左右,大大降低了零件的铸造成本,并保证了铸件质量。

Complicated structure, high microstructure density and high intensity were reguired for A1 alloy casing of curved arm box in high-tension distribution equipment. It was very difficult to use gravity casting technique of cold box resin-coated sand, and plenty of waste products were brought because of shrinkage cavity and porosity. In the condition of invariable casting structure, casting technique was optimized for many times, especially the shape and location of chill iron. The percent of pass of casting was improved from 70 percent to 90 percent, which reduced casting costs and guaranteed product quality.