钻小直径深孔时,由于钻头伸得长,切削力加大,将会产生扭曲、歪斜等现象,而变得不稳定,这显然会妨碍钻孔作业。本机构就是把长钻头的钻柄和钻刃部分中的若干处用支架支住,而得到良好的切削稳定性。、如图所示,在主轴头3中装有内设液压油缸的心轴5。油缸由缸盖2、10、固定缸盖的长螺杆6、活塞4组成。钻头7的钻柄装在活塞4的槽内,由活塞带动进给。由螺钉14、弹簧15控制钢球13来控制钻柄,防止轴向移动。在油缸内的若干处装上支 Drilling small diameter deep hole, due to drill bit extended, cutting force increases, will produce distortion, skew and so on, and become unstable, which will obviously hinder drilling operations. The body is the long drill bit and drill bit part of the drill support with a few branches, and get good cutting stability. , As shown in the figure, the spindle head 3 equipped with a hydraulic cylinder mandrel 5. The cylinder consists of a cylinder head 2 and 10, a long screw 6 for fixing the cylinder head, and a piston 4. Drill bit drill bit 7 mounted in the tank 4, driven by the piston feed. The ball 14 is controlled by the screw 14 and the spring 15 to control the shank to prevent axial movement. In a number of cylinders installed on the branch