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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。
High-voltage power distribution equipment parts - arm box shell, its complex structure, requires high tissue density and high strength. The use of cold-core box coated sand gravimetric casting production, the process is difficult, due to shrinkage and shrinkage defects caused by casting scrap more. In the case of not changing the structure of the casting, the optimization of the casting process, especially the design of the chill-iron shape and the placement position, can improve the casting qualification rate from about 70% to about 90%, greatly reducing the casting cost of the part and Ensure the quality of castings.