在箱体、支架类等零件中，其轴承孔的端面都有若干等分螺孔，用于安装端盖以固定轴承。在批量较大的生产中，这些螺纹底孔的加工大都用盖板式钻模来完成，这样每一规格的轴承孔，就要做一付盖板式钻模。在单件小批生产中，常见的加工方法有两种：一是先在轴承孔中塞入一块圆木? In the box, bracket and other parts, bearing holes on the end face has a number of equally threaded holes for the installation of the end cap to fix the bearings. In larger batch production, the machining of these tapped bottom holes is mostly done with a flat-plate die, so that for each bearing hole, a cover plate die is to be made. In a single small batch production, there are two common processing methods: First, the first hole in the bearing into a round wood?