双面调车信号机 signal for shunting forward and backward 双频感应器 double frequency inductor 双线臂板信号机 double wire semaphore signal ..
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double inductor line frequency quenching 双感应器工频淬火
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For this reason, special inductor and fixture have been designed and the heat treatment problem of the reverse fork has been successfully solved by double high frequency quenching.
为此，设计制造了特殊的感应器和工装夹具，采用二次高频淬火工艺解决了该倒挡拨叉的热处理难题。
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