我们的产品上经常用到九头的外螺纹和内螺纹。过去我们是用单刀分9次车成,不但生产效率低,而且分度也不准确,往往配合不好,造成废品。后来我们对刀具作了改进,提高了生产效率,并保证了质量。方法如下:首先做一把外螺纹车刀(如图3),车刀的螺纹条数要9条。再用这把外螺纹车刀来车内螺纹车刀,这样,车出来的是9头螺杆,把9头螺杆磨成适合的形状,就成为图4所示的内螺纹车刀。采用这种刀具,加工出来的内外螺纹,能够配合自如,并且 Nine-headed male and female threads are often used on our products. In the past we were using a single knife car 9 points, not only inefficient production, but also not accurate sub-degree, often with poor, resulting in waste. Later, we made improvements to our tools to improve production efficiency and ensure quality. The method is as follows: First make an external thread turning tool (Figure 3), the number of thread turning tool to 9. Re-use of this external thread lathe to the car thread lathe, so that the car came out of nine screws, the nine screws into a suitable shape, to become the internal thread turning tool shown in Figure 4. Using this tool, the internal and external threads machined, able to cooperate freely, and