我厂在BA型泵和W型泵的生产中,有大量的盘状类零件,如轴承压盖、泵盖等。在这些零件中,都有轴向距离尺寸精度要求较高的两个端面,如图1中的尺寸D~(+0.05)。在加工过程中,由于D尺寸公差较小,必须用深度千分尺或专用量具反复测量、反复走刀才能完成,工作量大,且质量不易保证。为此,我们设计了专用组合微调精车刀,其结构如图2。它由刀体、刀杆、粗调螺杆、微调螺杆、刀片和压紧螺钉组成。两个压紧螺钉起调整后压紧刀杆的作用。在调整时松开压紧螺钉,使刀杆只能相对于刀体轴向移动而不能相对转动。微调螺杆两段螺纹分别为M10(螺距1.5mm)和M8(螺距1.25mm),且螺旋方向相同;粗调螺杆的两段螺纹都是M10,但螺旋方向相反。在使用时,首先调整粗调螺杆,由于螺杆上两段螺纹的螺旋方向相反,故有“倍增进给”效果,粗调 I plant in the BA-type pumps and W-pump production, there are a large number of disc-like parts, such as bearing gland, pump cover and so on. Among these parts, there are two end faces with higher dimensional accuracy in axial direction, as shown in Figure 1, size D ~ (+0.05). In the process of processing, due to smaller size D tolerance, you must use a depth micrometer or a special measuring tool to repeat the measurement, repeated path to complete, heavy workload, and the quality is not easy to guarantee. To this end, we have designed a special combination fine tuning turning tool, the structure shown in Figure 2. It consists of a knife body, arbor, coarse adjustment screw, fine adjustment screw, blade and compression screw. Two clamping screws adjust the role of the cutter after the squeeze. Loosen the compression screw during adjustment so that the cutter bar can only move relative to the cutter body in an axial direction and can not rotate relative to the cutter body. Fine-tune the two screw threads are M10 (pitch 1.5mm) and M8 (pitch 1.25mm), and the same direction of spiral; coarse thread two threads are M10, but the opposite direction of the spiral. In use, the first coarse adjustment screw adjustment, the screw on the two threads of the opposite direction of the spiral, it has “double feed” effect, coarse