在车床加工中,有些工件不能在一次装夹中完成切削,需要调头重新装夹校正,才能继续切削加工,此时操作者往往用铜皮包裹工件的已加工表面,以避免损坏工件。这种方法不但使工件的同轴度降低,而且仍会夹坏工件表面。在生产批量较大时,可以设计专用夹具。但在单件、小批生产时,使用专用夹具就很不合算了。我厂以前使用过一种黄铜三圈工具(图1)。将三圈套在卡盘三爪上,再选一个适当尺寸的棒料夹在卡盘三瓜的后半部,然后将三圈中心一侧车成和工件外径同样尺寸的孔,取出棒料,即可使用。这种方法在一定程度上解决了上述工件调头重新装夹的问题,在我厂使用了二十余年,成了生产工艺中一种常用的消 In lathe machining, some workpieces can not be cut in one fixture and need to be re-clamped and calibrated before proceeding with cutting. At this moment, the operator often wraps the machined surface of the workpieces with copper skin to avoid damaging the workpieces. This method will not only reduce the concentricity of the workpiece, but will still clip the workpiece surface. In the production of large quantities, you can design special fixtures. However, in a single, small batch production, the use of special fixture is not cost-effective. I used to use a brass three-turn tool (Figure 1). The three laps in the chuck three claws, and then choose a suitable size of the bar clamped in the second half of the chuck three melons, and then one side of the center of the car into the outer diameter of the workpiece and the same size hole, remove the bar , You can use. This method to a certain extent, solve the above-mentioned work U-turn re-clamping problems, I used in the plant more than 20 years, has become a commonly used in the production process consumer