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我厂生产的大型钣件中,有一种要求在公差值为2mm的大孔(φ128mm)周围的同心圆上,钻8个卫星孔的工件。对这种大公差孔定位,加工同轴度小的圆周孔,我们制造了钢球扩涨定心钻模。其结构如图所示。当松开螺帽3时,锥轴6在弹簧5的作用下,向下移动。一组钢球10处于松驰状态。这时可将夹具轻松地装入工件定位孔中。夹具的定位端面靠自重压在工件的上
Among the large-scale sheet metal parts that I plant, there is a work piece that drills 8 satellite holes on a concentric circle around a large hole (φ128mm) with a tolerance of 2mm. Positioning of such a large tolerance hole, the processing of small coaxial circle hole, we have created a steel expansion centering drill. Its structure as shown. When the nut 3 is released, the cone shaft 6 moves downwards under the action of the spring 5. A set of steel balls 10 is in a relaxed state. At this time, the fixture can be easily inserted into the workpiece positioning hole. Fixture positioning end by the weight of the workpiece on the pressure