我厂有一种内孔直径为16毫米,长为176米的离合器套筒,要求在孔上加工出长176毫米,宽5毫米的键槽。此工件孔小键糟长,加工困难。以前在车床上拉削,费工费力,一人一班只能加工4～5个。后来,我们制造了一套胎具(图1,2)。使用这种胎具进行加工,一个工件就可节省100 I plant a diameter of 16 mm bore, length of 176 meters clutch sleeve, requiring the processing of the hole length 176 mm, 5 mm wide keyway. This small hole in the workpiece is so bad that it is difficult to machine. In the past on the lathe broaching, laborious effort, only one class can be processed 4 to 5. Later, we made a set of tools (Figure 1, 2). With this type of tooling, you save 100 jobs per piece