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南京第二机床厂生产的Y5120A型插齿机,用心轴装夹工件,如图所示:工件3装在心轴8上,放上开口垫圈2,拧紧拉杆7上的螺母1即可。因此,心轴的外圆尺寸直接影响工件的加工精度,如果心轴8和定位套6配合紧了,装卸心轴困难;配合松了,心轴的径向跳动就会超差,加工出来的零件经常超差。为此,我们做了些改进,将定位套6内孔和心轴8的外径都做成莫氏6号锥度。实践证明,这种结构定位精度高,拆卸心轴也方便。先取下螺母1、开口垫圈2、工件3、平垫圈4
Y5120A type gear shaper produced by Nanjing No.2 Machine Tool Plant uses the mandrel to clamp the workpiece. As shown in the figure, the workpiece 3 is installed on the mandrel 8, put the open washer 2, and tighten the nut 1 on the pull rod 7. Therefore, the size of the outer diameter of the mandrel directly affects the machining accuracy of the workpiece. If the mandrel 8 and the positioning sleeve 6 are tightened together, it is difficult to handle the mandrel. With the loose fitting, the radial runout of the mandrel will be overqualified. Parts often over tolerance. To this end, we made some improvements, the positioning sleeve 6 and the outer diameter of the mandrel 8 are made of Morse ’No. 6 taper. Practice has proved that this structure has high positioning accuracy, easy removal of the mandrel. First remove the nut 1, open washer 2, the workpiece 3, flat washers 4