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钻—镗机床通常用于精密箱体零件同轴孔的精加工,多功能新型机床也广泛用于精镗工序,制造这些机床是保证镗出具有高精度同轴孔的必要条件之一。因此必须弄清楚每种型号机床在其它能够完成精镗任务的机床中的地位,以便能够根据同轴孔组合方式的结构特点和具体精度要求,进行设备的优化选择。箱体零件中最广泛使用的是两个精确的标定同轴孔的组合方式。这种组合方式可能有五种典型代表(图1:按加工表面划分):方式Ⅰ(d_1=d_2;d_3>d_1);方式Ⅱ(b>l_2;d_1>d_2;d_1d_2);方式Ⅲ(d_1>d_3>d_2);方式Ⅳ(d-1=d_2;d_3<
Drilling - boring machine tools are usually used for finishing the coaxial bore of precision box parts. The new multifunctional machine tools are also widely used in the fine boring process. Manufacturing these machines is one of the necessary conditions for boring high-precision coaxial holes. Therefore, it is necessary to clarify the position of each type of machine tool in other machine tools capable of finishing the fine boring task so as to optimize the equipment according to the structural characteristics and specific accuracy requirements of the coaxial hole combination mode. The most widely used cabinet part is a combination of two precisely calibrated coaxial holes. There are five typical representatives of this combination (Figure 1: divided by processing surface): Method Ⅰ (d_1 = d_2; d_3> d_1); Method Ⅱ (b> l_2; d_1> d_2; d_1 d_2); Method III (d_1> d_3> d_2); Method Ⅳ (d-1 = d_2; d_3 <