花键孔的拉削,是用专用拉刀来加工的。由于花键种类和规格较多,故拉刀的种类和规格也应齐全,这对一个专业化工厂来说,也是不可能的。就中型工厂或搞单件机械修理的工厂,具备齐全昂贵的拉刀,可能就更困难了。在有增大螺距的车床上(如C 620)用单刀拉花键孔(单件或几件),就显得方便多了。我们在车床上拉削Y 320滚齿机主轴花键套,花键尺寸为10～100×90× Spline hole broaching, is to use a special broach to processing. As the spline types and specifications more, so broach type and size should also be complete, this is a professional factory, it is impossible. It may be even harder to have a mid-sized factory or a one-piece factory that has expensive broaches. It is much more convenient to use a single-point spline hole (single piece or several) on a lathe with an increased pitch (such as a C 620). We broached Y 320 hobbing machine spindle spline sleeves in the lathe, the spline size is 10 ~ 100 × 90 ×