现在花键拉刀多采用成形磨法磨制(图1)。但是对某些键数较多的花键拉刀,用这种方法就有一定的困难,原因是:1.由于键数较多,两相邻键之间构成之ф角较小,因而在修正砂轮时,会产生一定的困难。2.由于ф角较小,即便是能够将砂轮修正好,但用此法磨制时,砂轮与工件之间接触面积较大; Spline broaches are now more use of grinding mill grinding (Figure 1). However, for some spline broaches with a large number of keys, there are certain difficulties with this method because: 1. Since the number of keys is large, the angle between two adjacent keys is small, Correct the wheel, it will have some difficulties. 2. Because ф angle is small, even if the wheel can be corrected, but grinding with this method, the larger contact area between the wheel and the workpiece;