我厂常用两种规格不同的管件联接在一起,联接处采用补心件填空焊接,这样每年要用很多铜料做补心件,而且焊接也很麻烦。为了提高工作效率,我们制作了如图1所示简单的缩口器,这个缩口器采用滚动摩擦进行缩口。大大降低了摩擦力,不仅进给省力,而且不加冷却液也能连续工作一段时间。在车床上缩口时,工件卡在卡盘上,卡盘爪和工件接触面为弧形面,可以避免把铜管夹扁。缩口器装在尾架上,当工件旋转时,摇动尾架手轮进给 I often use two different specifications of the pipe fittings together, fill the gap at the joints with the Ministry of welding, so that each year to do a lot of copper material to make up the heart pieces, and the welding is also very troublesome. In order to improve work efficiency, we produced a simple shrink-fitting device as shown in Fig. 1, which uses a rolling friction to shrink. Greatly reduce the friction, not only to feed the effort, but also without coolant can also work continuously for some time. In the lathe necking, the workpiece stuck in the chuck, chuck jaw and the workpiece contact surface is curved, to avoid the clamp brass flat. Tipped device mounted on the tailstock, when the workpiece rotation, shaking tailstock handwheel feed