以混凝土拖泵中的典型零件——摇臂为例，介绍数控电火花线切割在内花键孔加工中的应用。

Taking the rocker arm of trailer concrete pump as a typical example, application of nc electric-spark line-cutting to female spline machining is described.

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文章针对拖式混凝土泵车中的一种典型零件，介绍一种简单、实用的外圆磨削夹具及零件的加工方法。

Aiming at a typical component in towed concrete pump, a simple and practical clamp and machining method are suggested in the paper.

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