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微孔加工是机械加工中经常碰到的,在车床上用手摇尾架进行微孔钻削,有比较大的困难。因为一只几十丝的钻头,利用尾架进行钻削时,毫无手感,只能凭视觉进行钻削,一不小心钻头就会折断,造成工件报废。图示结构的夹具是1mm以下微孔钻削用的车床专用钻孔夹具。工作原理:图示的操纵杆可回转360°(实际只要作180°的转动就可以完成钻削加工),手指轻轻推动操纵杆,就会使偏心轴转动、从而推动小轴和小钻头夹向前移动,使钻头钻入工件。当操纵杆向反方向转动,由于弹簧的作用,钻头即可迅速从工件中退出。但是,在设计时弹簧不能太粗,因为粗了用操纵杆进给时,作用力就大,从而使钻头接触工件的良好手感就失去了,所以弹簧的作用力只要把小钻头能从工件中退出就可以了。此外,为了能顺利的加工微孔,在小钻头钻入工件后,为防止切屑堵塞而折断钻
Micro-hole machining is often encountered in machining, the use of hand-cranked tailstock drilling in the hole, there are more difficult. Because a few dozen bits of drill bit, the use of tailstock for drilling, no feel, only by visual drilling, accidentally drill will be broken, resulting in scrapped parts. The clamp of the illustrated structure is a lathe-specific drilling jig for drilling a hole with a diameter of 1 mm or less. How it works: The joystick shown can be rotated 360 ° (actually as long as the 180 ° rotation can be completed drilling), finger gently push the joystick, it will make the eccentric shaft rotation, thus promoting small axis and small bit holder Move forward to drill into the workpiece. When the joystick is turned in the opposite direction, the drill bit can be quickly withdrawn from the workpiece due to the action of the spring. However, the design of the spring can not be too thick, because rough with the joystick feed, the force is large, so that the drill bit contact with the good feel of the workpiece is lost, so the spring force as long as the small drill from the workpiece Exit on it. In addition, in order to smooth the processing of micro-holes, small drill bit into the workpiece, in order to prevent chip jam and broken drill