我厂曾制造过一批解放牌汽车变速箱,其中第二速齿轮花键孔见图1所示。由于M8162A花键轴磨床行程不够,不能磨制较长的拉刀,造成花键孔加工困难。为此,我们利用原来的一把6-65D×58D_7×16D_d矩形花键拉刀,另外又制造一把同类的短拉刀及一把推刀(图2),组成三把为一套的花键孔加工刀具。先将花键孔外径依次拉削至尺寸,但此时键宽尺寸还不够,再用推刀扩大至加工要求。实践证明,这种加工方法效果较好。现仅将该推刀结构特点作一简介。一、结构在推刀的刀杆轴向两端有宽15~(+0.027)的缺口(见图3),缺口在圆周上错开。在每一缺口的下端有圆孔及螺孔。紧套5(图4)上端侧面与缺口滑配,下端 I plant has created a number of Jiefang brand car gearbox, in which the second-speed gear spline hole shown in Figure 1. Due to M8162A spline shaft grinder stroke is not enough, can not grind long broach, resulting in spline hole processing difficulties. To this end, we use a original 6-65D × 58D_7 × 16D_d rectangular spline broach, in addition to create a similar short broach and a push knife (Figure 2), composed of three flowers Keyhole processing tools. First spline hole diameter followed by broaching to size, but this time the key width size is not enough, and then use the knife to expand to processing requirements. Practice has proved that this method of processing is better. Now only push the knife structure for a brief introduction. First, the structure Knife in the push rod axial ends of the wide 15 ~ (+0.027) of the gap (see Figure 3), the gap staggered in the circumference. At the bottom of each notch with round holes and screw holes. Tight sets of 5 (Figure 4) The upper side of the gap with slip, the lower end