Case: EV Motor Copper Rotor End-rings
案例：新能源电机铜转子端环锻件
标签：电机转子, 端环, 新能源, 锻造案例
新能源车驱动电机铜转子端环（纯铜 T2，Ø180 mm）传统为铸造成形，改用热锻（700 ℃、闭式模锻）后致密度从 98.1% 升至 99.6%，电机效率提升 1.2 个百分点。工艺要点：中频加热 15 s 到温、转移 ≤5 s、锻后立即水淬（抑制晶粒长大 + 免退火）。模具带排气槽 0.05 mm 深，防止闭模憋气造成端环轮廓缺失。批产良率 98.5%。
EV motor copper end-rings (T2, Ø180 mm) were converted from casting to hot closed-die forging at 700 °C: density rose from 98.1% to 99.6% and motor efficiency by 1.2 points. Process keys: induction heating to temperature in 15 s, transfer within 5 s, immediate water quench after forging (arrests grain growth, skips annealing). Vents 0.05 mm deep in the die prevent trapped air from short-filling the ring profile. Production yield: 98.5%. ---