Case: Wind-turbine Slip-ring Copper Casting
案例：风电滑环铜环铸造
标签：滑环, 风电, 导电环, 离心铸造案例
某 3 MW 风机滑环导电环（Ø420×90 mm，纯铜 T2）采用立式离心铸造：外模砂衬金属型、离心转速 900 rpm，浇温 1150 ℃，浇后 60 s 内二级降速至 500 rpm 保压凝固。成品致密度达 99.2%，导电率 100% IACS 以上，环面车削后无需补焊。关键控制点：浇道偏心 30 mm 设计以均匀充型，铸型预热 220 ℃ 防冷隔。单件较锻造-焊接工艺降本 40%。
A 3 MW wind-turbine slip-ring (Ø420×90 mm, T2 copper) was cast by vertical centrifugal casting: sand-lined metal mold at 900 rpm, poured at 1150 °C, then two-stage speed reduction to 500 rpm within 60 s for pressurized solidification. Density reached 99.2% with conductivity above 100% IACS and no weld repair after turning. Keys: 30 mm offset sprue for even filling and mold preheat of 220 °C to prevent cold shuts—40% cheaper than a forged-welded build.